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朱其志,陈毓栋,余健,张瑨.不同状态灰砂岩应力松弛特性试验及本构模型研究[J].河北工程大学自然版,2022,39(1):38-45
不同状态灰砂岩应力松弛特性试验及本构模型研究
Experimental and Constitutive Modeling Study on Stress Relaxation Properties of Sandstone in Different States
投稿时间:2021-11-20  
DOI:10.3969/j.issn.1673-9469.2022.01.006
中文关键词:  灰砂岩  应力松弛  峰值应力循环  应力松弛本构模型  岩石流变
英文关键词:sandstone  stress relaxation  peak stress cycle  stress relaxation constitutive model  rock rheological
基金项目:国家自然科学基金资助项目(51679068,11902111);国家重点研发计划项目(2017YFC1501100)
作者单位
朱其志 河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098
河海大学 岩土工程科学 研究所, 江苏 南京 210098 
陈毓栋 河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098
河海大学 岩土工程科学 研究所, 江苏 南京 210098 
余健 中国电建集团华东勘测设计研究院有限公司, 浙江 杭州 310014 
张瑨 河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098
河海大学 岩土工程科学 研究所, 江苏 南京 210098 
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中文摘要:
      岩石的应力松弛现象涉及到各类岩体工程的长期稳定性,且工程中水的影响不容忽视。开展干燥与饱和两种状态下灰砂岩单级应力松弛试验与循环应力松弛试验,对比分析了两种状态试样的松弛行为差异,并采用四单元广义Maxwell 应力松弛本构模型对试验结果进行数值模拟验证。结果表明:(1) 两种状态下的灰砂岩都表现为非完全衰减的应力松弛形式;(2) 相同应变比条件下饱和状态试样的最终应力松弛量略高,差异主要表现在应力松弛的发展趋势上,深受水弱化作用的影响;(3) 峰值应力循环松弛试验中,由于水的弱化及内部耗能导致饱和试样延性增高,虽然干燥试样的应力松弛程度高于饱和试样,但对于循环次数以及最终破坏时的轴向应变,结果正相反;(4) 四单元广义Maxwell应力松弛本构模型能以极高的精度准确完整地描述灰砂岩单级应力松弛全过程及趋势。
英文摘要:
      The stress relaxation of rock is related to the long-term stability in all kinds of rock engineering, and the influence of water cannot be ignored. The tests of single-stage stress relaxation and cyclic stress relaxation for dry and saturated sandstone were conducted, and the differences of relaxation behavior between the two states of samples were analyzed contrastively. The generalized Maxwell relaxation constitutive model with four elements was adopted for the implementation of numerical verifications. The results show that: 1) The sandstone in both states represents the typical incomplete attenuation characteristic; 2) under the same strain ratio, the final stress relaxation degrees in saturation state are slightly higher. The difference is mainly reflected in the development of stress relaxation, which is deeply affected by the weakening of water; 3) in the peak stress cyclic relaxation tests, the ductility of saturated samples increase due to water weakening and internal energy dissipation. Although the stress relaxation degree of dry samples is higher than that of saturated samples, the results are opposite for the number of cycles and axial strain at final failure; 4) the constitutive model of four-element generalized Maxwell stress relaxation can completely describe the whole process and the trend of single-stage stress relaxation for sandstone with high accuracy.
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