| 不同排水条件下饱和砂土快速大剪切力学特性 |
| |
| 引用本文： | 洪勇,周蓉,郑孝玉.不同排水条件下饱和砂土快速大剪切力学特性[J].吉林大学学报(地球科学版),2018,48(5):1416-1426. |
| |
| 作者姓名： | 洪勇 周蓉 郑孝玉 |
| |
| 作者单位： | 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 |
| |
| 基金项目： | 国家自然科学基金项目（41272341，41572259）；山东省高等学校科技计划项目（J12LG08）；成都理工大学国家重点实验室开放基金项目（SKLGP2012K013） |
| |
| 摘 要： | 为探索滑坡灾害中土在复杂条件下的剪切力学特性，本文利用大型环剪试验机，通过进行各种排水条件下的连续大位移剪切试验，对不同法向应力、剪切速率和孔隙水压力等复杂条件下饱和砂土的力学特性及其变化机理进行了研究。结果表明：1）在连续快速剪切条件下，砂土剪切力学特性在干燥、不排水和排水等条件下呈现不同的变化形式。其中在不排水条件下，饱和砂出现一定的应变软化现象。2）在相同正应力和剪切速率的环剪试验中，饱和砂在不同排水条件下（上排水、下排水、上下排水）的抗剪强度出现显著差异。3）在排水环剪试验条件下，砂土剪切应力与强度的差异性变化不仅与土体内细土颗粒运移和结构变化有关，并且受到剪切过程中不同排水条件下孔隙水压力变化的影响和控制。4）排水环剪条件下，饱和砂孔隙水压力的消散变化不仅与不同排水方式下土体内所形成的排水通道顺畅程度有关，并且受到不同剪切速率和法向应力的影响作用。
|
| 关 键 词： | 环剪试验 抗剪强度 法向应力 剪切速率 孔隙水压力 |
| 收稿时间： | 2018-01-18 |
Fast Shear Mechanical Properties of Saturated Sand Under Different Drainage Conditions |
| |
| Hong Yong,Zhou Rong,Zheng Xiaoyu.Fast Shear Mechanical Properties of Saturated Sand Under Different Drainage Conditions[J].Journal of Jilin Unviersity:Earth Science Edition,2018,48(5):1416-1426. |
| |
| Authors: | Hong Yong Zhou Rong Zheng Xiaoyu |
| |
| Institution: | 1. Civil Engineering College, Qingdao University of Technology, Qingdao 266033, Shandong, China;2. College of Construction Engineering, Jilin University, Changchun 130026, China |
| |
| Abstract: | In order to explore the mechanical properties and mechanisms of saturated sands under different normal stresses, shearing rates and pore water pressures, a continuous large displacement shear test was conducted by using a large ring-shear test apparatus. The research results demonstrated that:1) Given continuous fast shearing, the shearing mechanical properties of sands changed differently under dry, non-drainage and drainage conditions. The saturated sands presented certain strain softening under the non-drainage condition. 2) In the ring-shear test with the same positive stress and shearing rate, the shear strengths of the saturated sands differed significantly under the different drainage conditions (upper drainage, down drainage and up-down drainage). 3) Under the drainage conditions in the ring-shear test, the difference between shearing stress and strength of sands was not only related with the fine particle movement and structural changes, but also influenced and controlled by the variations of the pore water pressure in the shearing process. 4) Given drainage ring-shearing, the dissipation of pore water pressure of saturated sands was related with the smoothness of the drainage channels formed in the soil under the different drainage modes, and influenced by different shearing rates and normal stress. |
| |
| Keywords: | ring shear test shear strength normal stress shear rate pore water pressure |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《吉林大学学报(地球科学版)》浏览原始摘要信息 |
| 点击此处可从《吉林大学学报(地球科学版)》下载免费的PDF全文 |
