Abstract:To investigate the influence of alkali environment on the mechanical performance of reinforced concrete (RC) beams strengthened with GFRP sheets, monotonic static tests were conducted on GFRP sheets and RC beams strengthened with GFRP sheets respectively.Which had been subjected tothe corrosion of alkal:solution Experimental results show that mechanical performance of GFRP sheets degenerates significantly in alkali environment, while the impregnating resin can obviously improve the durability of GFRP sheets. Degeneration of the bearing capacity and deformation performance of the strengthened beams is not apparent after being soaked in the alkali solution with pH 12.8 for 60 days. Mechanical performance of the strengthened beams is closely related to the interface adhesive property between GFRP sheets and RC beams.

Abstract:To study the error of calculated stress results and real measurement values of the cantilever beam with different element types and the its influencing factors, firstly, ABAQUS finite element software was used to model the shell element and solid element, and the stress value of Mises was calculated. Then the classical mechanics of materials method was used to calculate the same cantilever beam under Mises and the resistance strain test method was used to calculate real cantilever stress values. Finally, the shell element and the solid element of different thickness of the cantilever beam were used to calculate the Mises stress value. The results show that the Mises stress value calculated by the solid element is more close to the true value than the shell element. With the increase of the thickness of the cantilever beam, the accuracy of the calculation results of the shell element is getting smaller and smaller. For the same thickness of the cantilever beam, the relative error of the calculated stress value of the shell element at different position of the shell element is a constant.

Abstract:Based on the theory of fracture mechanics, the maximum stress criterion and the maximum principal strain criterion, the relationship between stress intensity factor and strain energy release rate of I-II-III mixed mode cracks was studied. And the I-II-III mixed mode fracture cracks were simulated by using the finite element software. And the relative error between the simulated value and the theoretical value is, which is within the tolerance range. It is shown that the formula of the relationship between stress intensity factor and strain energy release rate of I-II-III mixed mode cracks is reasonable.

Abstract:As a new type of soil reinforcement material, polymer curing agent plays an important role in slope greening and slope stability. The polymeric solidified agent reinforcement mechanism was analyzed, and the laboratory test of shear strength parameters was carried out. The aim of these works is to analyze the influence of the curing agent concentration and reinforcement thickness on slope stability under different slope conditions. The results show that the slope protection mechanism of the polymer curing agent is mainly for the consolidation of the polymer and the anchoring and reinforcement of the vegetation root system. The slope stability of polymer curing agent for different slope under the condition of the increase has a positive effect. In the same slope conditions, reinforced depth for stability is more affected by other factors than the curing agent concentration. Application of polymer curing agent to the slope engineering can promote the growth and restoration of vegetation on the slope surface, and the root reinforcement effect will be more conducive to improve the stability of the slope.

Abstract:The comman methods to directly determinate the soil water characteristic curve have the shortcomings of high cost, complicated and time-consuming. So the empirical formula method to predict soil water characteristic curve is more and more accounted. The main movement characteristics of?fluid are the changes of water transport and storage in the process of entering and filling the pore in unsaturated porous media. This problem can be soled by using Richard equation in COMSOL Multiphysics. The distribution of unsaturated soil average effective saturation was simulated and the average effective saturation in the soil and around sensor was forecasted. The simulation is compared with the actual situation and the results have practical significance.

Abstract:We take AC-13, SMA-13 mixtures as the research object,and describe the method of generating particles which is based on the theory of discrete element method. We judge whether the result of generating two mixture particles is consistent with the reality, results show that:two kinds of mixtures are suspended dense type and skeleton dense type, and agree with the actual situation; analysis properties of two kinds mixed material based on splitting test to verify the the feasibility of discrete element method, and a new train of thought is proposed for the research of the mixture properties in the future.

Abstract:The strength reduction finite element method was used to analyze the stability of the typical section of the South Main Canal of South to North Water Diversion Project. The Duncan-Chang nonlinear constitutive model was employed to describe the stress and strain relationship of the soils. The displacement mutation of the maximal horizontal displacement of the slope was used as a criterion for evaluating the instability. The research results based on the FEM reduction stability analysis was verified by traditional simplified Bishop Method. There is good accordance between both methods, which proved that the analysis is reasonable. And both results fulfil the designation requirement.

Abstract:Urban construction and the development of underground intersection have influence on the normal operation of the subway tunnel. The MC model and the CY model were used to predict and analyses the influence of the new high-rise building load on the settlement of the tunnel adjacent to the subway tunnel. The calculation results show that the two models are consistent with the influence of the building load on the surrounding soil, but it has a great difference between the influence range of the surface and the tunnel structure vertical settlement under the condition of the same other parameters. According to previous engineering experience, CY model is more consistent with the actual.

Abstract:In slurry shield construction, opening a chamber under compressed air is usually needed. To ensure the stability of excavation face in slurry shield, a pressed filter cake must be formed on the working face. In this paper, a new test apparatus was developed to study the airproof capability of a filter cake under varied pressure difference. Test results indicate that when the argitan was formed, the slurry consumption reduces along with the pressure difference growth.

Abstract:Through laboratory tests of low liquid limit silt in Taizhou area, 2.6~2.9 and 3.1~3.4 modulus of water glass were used as modifiers, and the effect of improved silt in the area was researched. The results show that the maximum dry density of two kinds of water glass modified soil are less than the plain soil, and the optimum moisture content is also greater than the plain soil. The CBR values of the low liquid limit silt with two kinds of water glass in the area are significantly increased, and the compaction degree has effects on the CBR value of the modified filler soil. With the increase of the compaction degree, the CBR value shows different proportion of growth. And the growth rate with 28 days is much greater than the growth rate of 0 day. The early strength of the 3.1~3.4 modulus water glass improved soil is higher than that of the 2.6~2.9 modulus water glass improved soil. Under the same maintenance conditions, the improved soil strength of the 2.6~2.9 modulus water glass improved soil is greatly improved.

Abstract:Groundwater seepage velocity can be accurately estimated by tracer techniques. The fresh water was used as an indirect tracer in the coastal area of groundwater with high salinity to test Groundwater seepage velocity by conducting tracer test and analyzing the data collected. And then, the equation was deducted. The experimental results show that this method can estimate the groundwater seepage flow rate in high salinity coastal area.

Abstract:Self-anchored suspension bridges are increasingly welcomed by Chinese bridge engineers due to its anchor-block-free fee-reduction, adaptation to soft soil ground and unique aesthetic effects. The triple-tower self-anchored suspension bridge, as a brand new structural form, is just continuing its mass construction. Its principles and analysis methods were explored. Specific procedures were given to determine the reasonable finished dead load state and a practical project was used for verification of the method.

Abstract:The construction method of submerged floating pipeline was proposed and its the calculation model and calculation method were given. The wave loads on the tube were calculated by the Morison formula, and the internal force of the pipeline under the action of wave force and flow force was calculated and analyzed. With the aid of ANSYS software, the finite element calculation model of the submerged floating pipeline was established. The speed and acceleration of water quality point were calculated by using Airy linear wave theory, the load and internal force on the pipeline were calculated. Comparative results show that the calculation results are basically consistent, and the deviations are within the controllable range, which can provide reference for the subsequent research and application.

Abstract:The fuzzy synthetic evaluation method and the analytic hierarchy process (AHP) were used to evaluate the lightening system of five universities in shanghai city from the four major aspects:level of lightening, glare feeling, brightness distribution and the indoor layout. Calculation results show that the university B is the best one among the five universities. Finally, some optimization suggestions were put forward.

Abstract:Vulnerability of groundwater resources is the basis for regional water resources planning and management. In view of the current lack of effective evaluation of groundwater resources, the groundwater resources was evaluated by taking the Yangzhou City Planning Area (Guangling, Hanjiang District) as example. Based on the characteristics of groundwater resources, hydrological and geological data, thirteen indexes were selected as the assessment index system, And the AHP was used to determine the index weight and finish the consistency analysis. The results showed that the groundwater vulnerability grade of Yangzhou urban planning area is Ⅱ-Ⅲ, the groundwater resources are relatively rich.

Abstract:The adsorption behavior and desorption method of aqueous Sb(III) on N201 supported by Fe(III) adsorbent material were examined by static and dynamic adsorption experiments. The results show that N201-Fe(III) on Sb(III) maximum static adsorption capacity is 610 μg/g, the best pH is 7, and the N201-Fe(III) resin is still highly selective for Sb(III) while coexisting with SO₄^2-, Cl^- in high concentration. The dynamic adsorption is capacity of 94.05 mg/L. EDTA is the best regenerative agent, under dynamic condition, its regeneration degree can be up to 85%.

Abstract:The characteristics of PM_2.5 in 13 cities before, during, and after APEC period were analyzed, and the sources of PM_2.5 using the chemical components of PM_2.5 were identified. The results show that the concentrations of PM_2.5 decrease by 58.7%, 52.9%, 50.1%, 47.3%, 43.5%, 36.7%, 34.9%, 33.4%, 29.6%, 26.9%, 20.2%, 19.9%, and 12.8% in Beijing, Shijiazhuang, Chengde, Langfang, Xingtai, Zhangjiakou, Handan, Tangshan, Tianjin, Hengshui, Cangzhou, Qinhuangdao, and Baoding during APEC period, respectively, compared with before APEC period. The concentrations of PM_2.5 decreased on average 35.9%, which is higher than 17.5% of SO₂, 21.3% of NO₂, and 22.0% of CO. The concentrations of NO₃^-, SO₄^2- and NH₄⁺ decreased by 32.0%, 32.9% and 39.1%, respectively, compared with the APEC period. There is no notable difference for the PM_2.5 sources before and during APEC period. The source contributions of coal/biomass combustion, metal smelting, and oil combustion increased to 21.7%, 14.0% and 20.8%, meanwhile, the source contributions of dust, industry, and secondary source decreased to 12.6%, 11.8% and 19.2%, respectively.

Abstract:Experimental study was carried out to quantify clay mineral and corresponding reservoir sensitivity of Chang 8 ultra-low permeability formation in Wuqi Area, Ordos basin. Thin sections were prepared out of core samples, while corresponding analyses were respectively performed by using the scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The composition and relative contents of clay minerals were identified. Subsequently, core samples flow experiments by injecting different synthetic brine were performed to evaluate reservoir sensitivity. The content of existing four main clay minerals, i.e. illite-montmorillonite mixed-layer, kaolinite, illite and chlorite, is 47%, 25%, 15%, 14% respectively. The physical property of reservoir is positive correlation with the content of chlorite, but is negative correlation with the content of illite and illite-montmorillonite mixed-layer. The differences of the morphology, properties and content of clay mineral cause the weak-medium weak velocity sensitivity, medium strong-strong water sensitivity, strong-extremely strong salt sensitivity, weak-medium weak acid sensitivity and weak-medium weak alkali sensitivity.

Abstract:On the basis of the fine small layer contrast, the micro-structure of Shen 161 was analyzed based on the large-scale drawing close spacing methods through three kinds of micro-structural units and four configuration modes. The control degree of micro-structural type and configuration mode to the residual oil was studied. Results show that the microstructure forward unit, developmental region of top convex bottom convex type configuration are the advantageous area of Shen 161 block for the remaining oil distribution. The distributary channel deposit there has the best control effect on residual oil.

Abstract:Using core, rock thin section, cast thin section, scanning electron microscope and X diffraction analysis data, combined with previous research results, we studied the petrological characteristics of long 6 sandstone reservoir in Longdong area of Ordos Basin. And the petrological characteristics of different blocks were compared and analyzed. The results show that the main rock types of this area are lithic feldspathic sandstones and feldspar sandstones. Quartz, feldspar content is high, detritus, interstitial material content and compositional maturity are low. The interstitial material is mainly of metamorphic detritus, and the plastic detritus content is high. The change of relative content of rigid-plastic debris has obvious orientation; Sorting is medium-well, particle is main of sep-angular, structure maturity is relatively high. Petrological characteristics of each cell block are different. The difference of provenance and sedimentary environment is the important factor for the petrologic characteristics.

Abstract:The information on land cover at national scales is critical for addressing climate change, biodiversity conservation, ecosystem assessment and environmental modeling. The Volunteered Geographic Information derived from the GEO_WIKI and Degree-Confluence Project was used as referenced data. The category accuracy and the category confusion about FORM-GLC-agg 500m and MODIS COLLECTION5 were compared and the spatial distribution of FORM-GLC-agg's category accuracy was analyzed. The results show that:there is no significant difference on producer and user accuracy between FORM-GLC-agg and MODIS data. They both have a serious confusion between Forest/shrub, cropland/shrub, especially the grassland and bare land. The category accuracy has an uneven distribution, for example, its higher value mainly distributes in northwest and north China, and the lower value more mainly distributes in Tibet Plateau, and southwest China. The results can provide reference for land cover research.

Abstract:The heat treatment process of 34CrMo4 large diameter seamless steel gas cylinders was studied. It is an important manufacturing process to ensure the mechanical properties of the seamless cylinder to meet the standard requirements. The influence of quenching and tempering temperature on the microstructure and properties of 34CrMo4 after complete quenching and high temperature tempering was investigated by using metallographic observation, scanning electron microscopy (SEM) and energy dispersive spectrum (EDS). The results show that the sample heat treated at an optimum process quenching at 930℃, for 60min, tempering at 560℃ for 120min can obtain the best comprehensive properties. It's beneficial to the application and safety of 34CrMo4 large diameter seamless steel gas cylinders.

Abstract:Logistics distribution activities often encounter with new customer or customer who wants to return goods for refund. The customer relationship management and the disruption management were combined to set up the distribution vehicle disruption management model under the customer segmentation by taking the customer quantity change as the object. Finally, the model was optimized by the plant growth simulation algorithm. Engineering practice verified the validity of the model and algorithm.