[1]马田田,韦昌富,魏厚振,等.不同水力路径下非饱和粉质土的破坏与变形特性[J].山地学报,2013,(01):108.
　MA Tiantian,WEI Changfu,WEI Houzhen,et al.Characteristics of Failure and Deformation of an Unsaturated Silty Soil Experiencing Various Hydraulic Histories[J].Mountain Research,2013,(01):108.
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不同水力路径下非饱和粉质土的破坏与变形特性()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2013年01期
页码:
108
栏目:
山地灾害
出版日期:
2013-01-01

文章信息/Info

Title:
Characteristics of Failure and Deformation of an Unsaturated Silty Soil Experiencing Various Hydraulic Histories
作者:
马田田; 韦昌富; 魏厚振; 田慧会
中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北 武汉 430071
Author(s):
MA Tiantian; WEI Changfu; WEI Houzhen; TIAN Huihui
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
关键词:
毛细滞回; 抗剪强度; 有效应力; 土水特征曲线; 渗流与变形耦合
Keywords:
capillary hysteresis;  shear strength;  effective stress;  soilwater characteristic curve; coupling of seepage and strain
分类号:
P642-1,TU43
文献标志码:
A
摘要:
通过压力板仪、temple仪和直剪仪对非饱和粉土经过脱湿之后和不同含水量状态分别进行抗剪强度试验研究。试验结果表明：如果采用净应力来描述，非饱和土的有效粘聚力随着含水量的增大而减小，或随着基质吸力的增大而增大，但有效内摩擦角基本保持不变。当饱和度相同时，经过脱湿之后的土体有效粘聚力较大，反映出滞回效应。如果采用有效应力来描述，抗剪强度曲线则归一化为一条临界状态线，而与含水量大小和水力路径无关，从而证明了采用有效应力的合理性与有效性。在修正剑桥模型基础上，将饱和度和基质吸力作为内变量，提出屈服强度的硬化函数，建立渗流与变形耦合模型，从而可以考虑前期降雨历史对非饱和土边坡稳定性的影响。
Abstract:
Capillary hysteresis is an intrinsic phenomenon of the unsaturated soil. At the same matric suction, the degree of saturation of a soil with hydraulic histories is different, and the shear strength of the soil is also different. By conducting direct shear tests on the silty soil samples with different hydraulic histories, the result shows that, if the experimental data are represented by net stress, the effective cohesion decreases with degree of saturation and increases with matric suction, whereas the internal friction angle remains constant. If the experimental data are expressed using the effective stress, the shear strength curve can be normalized into a single line, independent of saturation and hydraulic history. Based on the modified Cam clay model, a hardening function of yield stress is developed, which treats the matric suction and saturated degree as internal variables. The proposed model is useful in analyzing the effect of antecedent rainfall on the stability of unsaturated soil slopes.

相似文献/References:

[1]谢凯,余宏明,彭祖武,等.河南省栾川县泥石流源地土大直剪试验[J].山地学报,2013,(06):738.
　XIE Kai,YU Hongming,PENG Zuwu,et al.Large Scale Direct Shear Test of Debris Flow Source Soil in Luanchuan of Henan[J].Mountain Research,2013,(01):738.
[2]李光莹,虎啸天,李希来,等.黄河源玛沁地区高寒草地植物固土护坡的力学效应[J].山地学报,2014,(05):550.
　LI Guangying,HU Xiaotian,LI Xilai,et al.Mechanical Effects of Alpine Grassland Plants in Slope Protection in Maqin County of the Source Area of the Yellow River[J].Mountain Research,2014,(01):550.

备注/Memo

备注/Memo:
收稿日期(Received date)：2012-01-08；改回日期(Accepted) : 2012-08-25。
基金项目（Foundation item）：国家自然科学基金（10872211）；中国科学院“百人计划”择优项目；中国科学院方向性项目（kzcxz-yw-150）共同资助。[Jointly supported by the Project of National Natural Science Foundation of China (10872211), the‘100 Talents Project’of Chinese Academy of Science, and Funds of the Chinese Academy of Sciences for Key Topics in Innovation Engineering (kzcxz-yw-150).]
作者简介（Biography）：马田田（1986-），女，山东济宁人，博士研究生，主要从事非饱和土方面的研究工作。[Ma Tiantian(1986-), female, Jining of Shandong, Doctoral Student, major in research work of unsaturated soil.]
更新日期/Last Update: 1900-01-01