[1]郭倩怡,谷天峰,谢婉丽,等.不同试验方法下黄土抗剪强度以及参数差异分析——以甘肃省黑方台黄土滑坡为例[J].防灾科技学院学报,2018,20(01):25-31.
 Guo Qianyi,Gu Tianfeng,Xie Wanli,et al.Analysis of Shear Strength and Parameter Difference of Loess underDifferent Test Methods—Taking Heifangtai Loess Landslides in GansuProvince as an Example[J].JOURNAL OF INSTITUTE OF DISASTER PREVENTION,2018,20(01):25-31.
点击复制

不同试验方法下黄土抗剪强度以及参数差异分析——以甘肃省黑方台黄土滑坡为例
分享到:

《防灾科技学院学报》[ISSN:1673-8047/CN:13-1377/P]

卷:
第20卷
期数:
2018年01期
页码:
25-31
栏目:
目次
出版日期:
2018-03-31

文章信息/Info

Title:
Analysis of Shear Strength and Parameter Difference of Loess under Different Test Methods—Taking Heifangtai Loess Landslides in Gansu Province as an Example
作者:
郭倩怡谷天峰谢婉丽吴熠哲
西北大学地质学系 大陆动力学国家重点实验室,陕西 西安710069
Author(s):
Guo Qianyi Gu Tianfeng Xie Wanli Wu Yizhe
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
关键词:
非饱和黄土 抗剪强度 基质吸力
Keywords:
unsaturated loess shear strength matric suction
分类号:
TU441.7
文献标志码:
A
摘要:
黄土是一种典型的非饱和土,在总结前人试验研究的基础上,以甘肃省永靖县黑方台非饱和黄土为研究对象,进行两种不同的直剪试验,即:利用改进后的非饱和直剪仪对研究区不扰动黄土进行控制基质吸力和净竖向压力为常数的固结慢剪试验,依据研究区土水特征曲线配置不同含水率以控制不同的基质吸力的黄土快速直剪试验。得到两种试验方法下不同基质吸力或含水率和净竖向压力下的非饱和黄土抗剪强度及其参数,探讨非饱和黄土抗剪强度及其参数与基质吸力的关系,并分析两种试验方法所得非饱和黄土抗剪强度及其参数的差异。试验结果表明:两种不同的试验方法下净竖向压力及基质吸力对于研究区非饱和黄土抗剪强度均呈线性增长关系,而抗剪强度参数—黏聚力与基质吸力二者呈线性关系,内摩擦角—基质吸力关系曲线近似成水平直线,其中不同含水率黄土直剪试验在相同基质吸力和竖向压力的条件下,其抗剪强度及内摩擦角略高于非饱和固结排水直剪试验,而其黏聚力略低于非饱和固结排水直剪试验所得黏聚力。
Abstract:
Loess is one kind of typical unsaturated soil. Based on the previous test results, we carried out two different direct shear tests by taking unsaturated loess of Heifangtai platform at Yongjing, Gansu province as the study object. One is the consolidated slow shear test of controlling matric suction and vertical pressure on undisturbed loess in the study area by using improved unsaturated direct shear apparatus, and the other is loess fast direct shear test based on the SWCC configured with different moisture content to control different matric suction. As a result, the shear strength of unsaturated loess and its parameters under different matric suction or water content and net vertical pressure under the two different test methods are obtained. Moreover, the relationship between the shear strength of unsaturated loess and its parameters and matrix suction is discussed, and the differences of shear strength of unsaturated loess and its parameters obtained by two test methods are analyzed. All these provide a theoritical support for future control of loess landslides. The test results show, the net vertical pressure and the matrix suction under the two different test methods have a linear growth relationship with the shear strength of unsaturated loess in the study area. There is a linear relationship between cohesive force and matrix suction. The relationship curve between the internal friction angle and the matrix suction shows approximately a horizontal line. Under the condition of the same matrix suction and vertical pressure, the shear strength and the internal friction angle in the direct shear test of the loess with different water content are slightly higher than those in unsaturated consolidated drainage direct shear test, while the cohesive force from the former test is slightly lower than that of the latter.

参考文献/References:

[1]赵慧丽,马易鲁,牛红凯. 非饱和土抗剪强度研究方法的探讨[J]. 岩土工程技术,2001 (3):142-145.
[2]汤连生.从粒间吸力特性再认识非饱和土抗剪强度理论[J].岩土工程学报,2001,23(4):412-417.
[3]沈珠江.广义吸力和非饱和土的统一变形理论[J].岩土工程学报,1996,11(1):1-9.
[4]徐永福,龚友平,殷宗泽.非饱和膨胀土强度的分形特征[J].工程力学,1996,15(2):14-18.
[5]缪林昌,仲晓晨,殷宗泽.膨胀土的强度与含水量的关系[J].岩土力学,1999,20(2):71-75.
[6]Schnellman R, Rahardjo H, Schneiderc H R. Unsaturated shear strength of a silty sand[J]. Engineering Geology,2013(162):88-96.
[7]边加敏,王保田.含水量对非饱和土抗剪强度参数的影响研究[J].地下空间与工程学报,2011,7(1):17-21+43.
[8]Nama S, Gutierrez M, Diplasa P,et al. Determination of the shear strength of unsaturated soils using the multistage direct shear test[J]. Engineering Geology,2011(122):272-280.
[9]黄润秋,吴礼舟. 非饱和土抗剪强度的研究[J]. 成都理工大学学报(自然科学版),2007,34(3):221-224.
[10]林鸿州,李广信,于玉贞,等. 基质吸力对非饱和土抗剪强度的影响[J]. 岩土力学,2007,28(9):1931-1936.
[11]杨庆,张慧珍,栾茂田. 非饱和膨胀土抗剪强度的试验研究[J]. 岩石力学与工程学报,2004,23(3):420-425.
[12]扈胜霞,周云东,陈正汉. 非饱和原状黄土强度特性的试验研究[J]. 岩土力学,2005,26(4):660-663+672.
[13]宋友建,胡新丽,郭利娜,等. 吸力路径对非饱和土力学性质的影响[J]. 水文地质工程地质,2013,40(5):64-68.
[14]闫亚景,文宝萍,计博勋. 基质吸力对非饱和重塑黄土抗剪强度的贡献[J]. 工程地质学报,2011,19(6):865-874.
[15]邢鲜丽,李同录,李萍,等. 黄土抗剪强度与含水率的变化规律[J]. 水文地质工程地质,2014,41(3):53-59+97.

备注/Memo

备注/Memo:
收稿日期:2017-08-04 基金项目:国家自然科学基金重点项目(41630639);西北大学研究生创新人才培养项目(YZZ15017) 作者简介:郭倩怡(1993—),女,硕士研究生,主要从事非饱和土力学研究。
更新日期/Last Update: 2018-03-30