(宁波大学岩土工程研究所, 宁波 315211)

［摘要］为了解宁波地区典型软黏土在温度作用下的固结特性，对其进行了不同温度和围压下的热固结试验，并进行了理论分析。结果表明：理论分析和试验结果相互验证；对软黏土而言，温度主要通过影响土中水的粘滞系数来提高土体的渗透系数，进而加速土体的固结过程；温度越高，土体的固结越快，土体的固结度也越高；温差越大，固结度差值越大；不同温度下的固结度差值随时间的增大呈现出先快速增大至极值，然后再逐渐减小至零的现象。因此，温度效应主要体现在排水固结过程的前小半段时间内，而且温差越大，影响效果越明显。

［关键词］软黏土; 热固结特性; 固结度; 温度效应

中图分类号：TU47      文献标识码：A      文章编号：1002-848X(2014)08-0066-04

Theoretical and experimental study on thermal consolidation characteristics of typical soft clay in Ningbo region

Yin Tiefeng, Liu Ganbin, Guo Zhen

 (Institute of Geotechnical Engineering, Ningbo University, Ningbo 315211, China)

Abstract: In order to study the thermal consolidation characteristics of the typical soft clay in Ningbo region, thermal consolidation test under different temperatures and confining pressures were conducted. Combined with the theoretical analysis, the results show that theoretical results and test results verify each other. For soft clay, temperature increases the penetration rate of the soil by influence the viscous coefficient of the water to accelerate the consolidation process. The higher the temperature is, the faster consolidation of the soil is, and the consolidation degree of the soil is higher. The larger the temperature difference is, the larger the difference of the consolidation degree is. The difference of the consolidation degree under different temperature rapidly increases to the extreme values at first and gradually reduces to zero with the increment of time. Therefore, the effect of temperature is mainly reflected in the first half period of the drainage consolidation process, and the larger the temperature difference is, the more obvious the effect is.

Keywords: soft clay; thermal consolidation characteristic; consolidation degree; temperature effect

*国家自然科学基金资助项目(51278256, 51178227),宁波大学研究生科研创新基金资助项目,宁波大学优秀学位论文培育基金资助项目。

作者简介：尹铁锋，硕士，Email: 397749460@qq.com。

参考文献

［1］CHANINUN POTHIRAKSANON, DENNES T BERGADO, HOSSAM M ABUELNAGA. Full-scale embankment consolidation test using prefabricated vertical thermal drains［J］. Soils and Foundations, 2010, 50(5): 599-608.

［2］BRUYN D DE, THIMUS J F. The influence of temperature on mechanical characteristics of boom clay: the results of an initial aboratory programme［J］. Engineering Geology, 1996, 41(1-4): 117-126.

［3］CEKEREVAC C, LALOUI L. Experimental study of thermal effects on the mechanical behaviour of a clay［J］. International Journal for Numerical and Analytical Methods in Geomechanics, 2004, 28 (3): 209-228.

［4］郭桢，刘干斌，尹铁锋，等. 考虑温度的软黏土邓肯张模型参数试验研究［J］. 建筑结构, 2014,44(3)：93-96.

［5］陶海冰，谢康和，刘干斌，等.考虑温度耦合效应的竖井地基固结有限元分析［J］.岩土力学，2013,34(S1):494-500.

［6］张国强. 流体力学［M］.北京：机械工业出版社，2006.