| 利用HCA研究黏土渗透系数的标准探索 |
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| 引用本文： | 余良贵,周建,温晓贵,徐杰,罗凌晖.利用HCA研究黏土渗透系数的标准探索[J].岩土力学,2019,40(6):2293-2302. |
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| 作者姓名： | 余良贵 周建 温晓贵 徐杰 罗凌晖 |
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| 作者单位： | 1. 浙江大学 滨海和城市岩土工程研究中心，浙江 杭州 310058；2. 浙江大学 浙江省城市地下空间开发工程技术研究中心，浙江 杭州 310058 |
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| 基金项目： | 国家重点研发计划（No.2016YFC0800203）；国家自然科学基金重点项目（No.51338009）。 |
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| 摘 要： | 黏性土渗透系数影响因素较多，甚至不同试验手段对试验结果都有较大影响。针对目前渗流试验中存在的问题，提出采用空心圆柱扭剪仪（HCA）测定软土渗透系数的方法，对其开展意义、可行性及试验步骤进行说明分析，并以重塑高岭土作为研究对象，开展一系列试验研究，探讨利用HCA开展渗流试验的标准，最终进行动力特性对软土渗透性影响的试验初步探索。结果表明：（1）以3 600 s作为单位时间，当连续24 h的单位时间内平均渗透系数差值小于2%，将该阶段中得到渗透系数平均值作为最终渗透系数较为准确；（2）综合试验效率、试验间的可比性以及试验结果准确性，建议利用HCA开展重塑高岭土渗流试验时可选水力梯度范围为10～15；（3）重塑高岭土经过交通荷载作用10万次后，其渗透系数比经静载压缩同等轴向应变后的渗透系数低12.79%，即研究动力特性对渗透系数的影响意义重大。
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| 关 键 词： | 渗透系数 空心圆柱扭剪仪 重塑高岭土 试验标准 |
| 收稿时间： | 2018-03-18 |
Standard exploration of permeability coefficient test for clay by HCA |
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| YU Liang-gui,ZHOU Jian,WEN Xiao-gui,XU Jie,LUO Ling-hui.Standard exploration of permeability coefficient test for clay by HCA[J].Rock and Soil Mechanics,2019,40(6):2293-2302. |
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| Authors: | YU Liang-gui ZHOU Jian WEN Xiao-gui XU Jie LUO Ling-hui |
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| Institution: | 1. Coastal and Urban Geotechnical Engineering Research Center, Zhejiang University, Hangzhou, Zhejiang 310058, China;
2. Zhejiang Urban Underground Space Development Engineering Research Center, Zhejiang University, Hangzhou, Zhejiang 310058, China |
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| Abstract: | There are many factors affecting the permeability coefficient (k) of cohesive soil, and different test methods have great influence on the test results. To solve the problems existing in present test methods, a hollow cylindrical torsional shear apparatus (HCA) was used for seepage tests. The significance, feasibility and experimental procedures for HCA seepage test were demonstrated, and remolded kaolin was used to carry out a series of experiments to explore the standard rules for permeability tests. Finally, a preliminary study of the dynamic test was explored. The results show that: (1) If 3 600 s is taken as the unit of time, the difference in average permeability coefficient in the unit time is less than 2% in continuous 24 h. Therefore, it is accurate to take the average of permeability coefficient obtained in this stage as the final permeability. (2) The hydraulic gradient range in HCA permeability test for kaolin is suggested between 10 and 15 after comprehensive consideration of test efficiency, comparability, and the accuracy. (3) After 100 000 cycles of dynamic traffic load, the permeability coefficient of kaolin is 12.79% lower than that of the same axial strain in static compression test, indicating that it is important to study the influence of dynamic characteristics on permeability coefficient. |
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| Keywords: | permeability coefficient HCA remolded kaolin test standard |
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