陕西泾阳南塬滑坡干湿黄土快速大剪切力学特性

doi:10.13278/j.cnki.jjuese.201704201

吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (4): 1207-1218.doi: 10.13278/j.cnki.jjuese.201704201

陕西泾阳南塬滑坡干湿黄土快速大剪切力学特性

洪勇¹, 车效文¹, 郑孝玉², 刘鹏¹, 周蓉¹

1. 青岛理工大学土木工程学院, 山东青岛 266033;
2. 吉林大学建设工程学院, 长春 130026

收稿日期:2016-11-14 出版日期:2017-07-26 发布日期:2017-07-26
作者简介:洪勇(1970—),男,副教授,主要从事岩土力学和地质灾害方面的研究,E-mail:hongyong11@aliyun.com
基金资助:
国家自然科学基金项目（41272341，41572259）；山东省高等学校科技项目（J12LG08）

Fast Shear Behavior of Saturated and Dry Loess at South Plateau Landslide of Jingyang, Shaanxi

Hong Yong¹, Che Xiaowen¹, Zheng Xiaoyu², Liu Peng¹, Zhou Rong¹

1. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China;
2. College of Construction Engineering, Jilin University, Changchun 130026, China

Received:2016-11-14 Online:2017-07-26 Published:2017-07-26
Supported by:
Supported by National Natural Science Foundation of China (41272341; 41572259), Science and Technology Project in Colleges and Universities of Shandong Province (J12LG08)

摘要/Abstract

摘要： 借助于先进的多功能大型高速高压环剪试验机，针对陕西泾阳南塬滑坡中的饱和黄土、干燥黄土在快速大剪切位移条件下的力学响应特性进行了环剪试验研究。研究结果表明：1）在相同试验条件下，与干燥状态黄土相比，泾阳南塬黄土在饱和条件下抗剪强度指标降低。2）在连续快速剪切条件下，泾阳南塬滑坡饱和与干燥黄土均表现出应变软化特征，饱和黄土比干燥黄土的软化特征更加显著。3）在相同法向应力条件下，剪切速率对饱和和干燥黄土峰值强度均有显著影响，但两种状态下土体峰值强度随剪切速率变化特征不同。饱和黄土峰值强度随剪切速率的增大而增大，而干燥黄土峰值强度随剪切速率的增大而减小。4）在不同含水状态下，泾阳南塬滑坡黄土剪切力学特性变化规律具有不同的产生机理。其中，干燥黄土抗剪强度在连续剪切过程中主要受黏土颗粒间摩擦（阻）力、颗粒运移与定向排列以及剪切面形态的控制。与干燥黄土相比，饱和黄土峰值抗剪强度变化主要受土黏聚力的控制并受水的影响；土体内水的作用能够加剧其应变软化程度并可形成光滑平整的剪切面形态，进而对其峰后剪切应力变化产生影响。

关键词: 环剪试验, 抗剪强度, 剪切速率, 应变软化, 峰值强度, 残余强度

Abstract: Experimental studies were conducted on fast shear conditions of saturated and dry loess at south Jingyang Plateau Landslide, Shaanxi by employing ring shear apparatus. Test results indicate that: 1)Compared with the dry state loess, the saturated loess significantly reduce the shear strength index under the same test conditions. 2)The saturated with the dry loess retrieved from south of Jingyang have shown strain softening characteristics in quick succession shear conditions, but saturated loess is more significant softening characteristics than the dried loess.3)Under the same conditions of normal stress, shear rate has significant influence to peak intensity for drying and saturated loess, but the peak strength of the soil in pace with the shear velocity variation is different under the two states. The peak intensity of swaturated loess increases with shear rate, and peak intensity of dry loess decreases with increasing shear rate.4)In different aqueous state, shear mechanical characteristics of loess retrieved from south of Jingyang have different variation of the mechanism. Among them, in a continuous shearing process the shear strength of dry loess is mainly dominated by clay particles friction (resistance) force, particle alignment and the shear surface morphology. Compared with the dry loess, the peak shear strength of saturated loess soil is mainly affected by changes in the cohesion of control. Effect of soil water in the body can exacerbate their degree of strain softening and form shear smooth surface morphology, thereby affecting its peak after the shear stress.

Key words: ring shear test, shear strength, shear rate, strain softening, peak intensity, residual strength

中图分类号:

P642.13

洪勇, 车效文, 郑孝玉, 刘鹏, 周蓉. 陕西泾阳南塬滑坡干湿黄土快速大剪切力学特性[J]. 吉林大学学报(地球科学版), 2017, 47(4): 1207-1218.

Hong Yong, Che Xiaowen, Zheng Xiaoyu, Liu Peng, Zhou Rong. Fast Shear Behavior of Saturated and Dry Loess at South Plateau Landslide of Jingyang, Shaanxi[J]. Journal of Jilin University(Earth Science Edition), 2017, 47(4): 1207-1218.

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陕西泾阳南塬滑坡干湿黄土快速大剪切力学特性

Fast Shear Behavior of Saturated and Dry Loess at South Plateau Landslide of Jingyang, Shaanxi

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