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卢洪宁,胡国长,朱晓勇,刘瑾,薛建,张发明,王梓.剑麻纤维复合黏土基材与底面力学耦合特性试验研究[J].河北工程大学自然版,2021,38(4):44-52
剑麻纤维复合黏土基材与底面力学耦合特性试验研究
Experimental Study on Coupling Characteristics of Contact Surface Between Fiber Composite Clay and Subface
投稿时间:2021-06-29  
DOI:10.3969/j.issn.1673-9469.2021.04.007
中文关键词:  岩质边坡  纤维复合黏土  滑动摩擦试验  耦合特性  微观分析
英文关键词:rocky slope  fiber composite clay  sliding friction test  coupling stability  microscopic
基金项目:国家自然科学基金资助项目(41472241);江苏省地质矿产勘查局科研项目(2019KY13)
作者单位
卢洪宁 河海大学 地球科学与工程学院, 江苏 南京 211100 
胡国长 江苏省山水资源开发集团有限公司, 江苏 南京 210001 
朱晓勇 江苏省山水资源开发集团有限公司, 江苏 南京 210001 
刘瑾 河海大学 地球科学与工程学院, 江苏 南京 211100 
薛建 江苏省山水资源开发集团有限公司, 江苏 南京 210001 
张发明 河海大学 地球科学与工程学院, 江苏 南京 211100 
王梓 河海大学 地球科学与工程学院, 江苏 南京 211100 
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中文摘要:
      土-岩界面是岩质边坡客土修复中常见的二元地质结构,基于纤维加筋技术,对纤维复合黏土基材与底面耦合稳定性展开研究,通过开展滑动摩擦试验,研究含水率、剑麻纤维含量等变量对接触界面土体滑动过程的影响,与微观分析相结合,探究剑麻纤维对黏土的改良机理。研究结果表明:(1)随含水率的增加,试样的动摩擦系数平均值呈先增大后减小的变化趋势;临界摩擦角α均随试样含水率的提高先增大到最大值,而后呈减小的趋势。当试样含水率位于塑限、液限之间时,存在最优含水率值使动摩擦系数与临界摩擦角达到最大值,此时黏土试样的黏附效果最优;(2)随着纤维掺量由0%增至1.2%,试样的动摩擦系数平均值及临界摩擦角呈先增大后减小的变化趋势;剑麻纤维的掺入能有效提高试样抗滑破坏能力,但会随着纤维掺量增加加固效果会减弱,试验中剑麻纤维掺量为0.8%时纤维复合黏土与亚克力板接触界面的耦合效果最佳。
英文摘要:
      The soil-rock interface is a common binary geological structure in the remediation of rock slopes. Based on the fiber reinforcement technology, this paper studies the coupling stability between the fiber composite clay substrate and the bottom. Through the sliding friction test, the influence of moisture content, sisal fiber content and other variables on the sliding process of the soil at the contact interface is studied. Combined with the micro analysis, the improvement mechanism of sisal fiber on clay is explored. The main research results are as follows:(1) With the increase of moisture content, the average value of dynamic friction coefficient of the sample increases first and then decreases. The critical friction angle α increases to the maximum value first and then decreases with the increase of moisture content. When the moisture content of the sample is between the plastic limit and the liquid limit, there is an optimal moisture content value to maximize the dynamic friction coefficient and the critical friction angle, and the adhesion effect of the clay sample is the best. (2) With the increase of fiber content from 0% to 1.2%, the average dynamic friction coefficient and the critical friction angle of the sample increase first and then decrease. The addition of sisal fiber can effectively improve the sliding failure resistance of the sample, but the reinforcement effect will be weakened with the increase of fiber content. The coupling effect of fiber composite clay and acrylic plate contact interface is the best when the content of sisal fiber is 0.8%.
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