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| 轻量砂抗剪强度特性三轴试验研究 | |
| 引用本文： | 侯天顺,徐光黎,楼建东.轻量砂抗剪强度特性三轴试验研究[J].中南大学学报(自然科学版),2011,42(11). |
| 作者姓名： | 侯天顺 徐光黎 楼建东 |
| 作者单位： | 1. 西北农林科技大学水利与建筑工程学院,陕西杨凌,712100;中国地质大学生物地质与环境地质教育部重点实验室,湖北武汉,430074 2. 中国地质大学生物地质与环境地质教育部重点实验室,湖北武汉,430074 3. 浙江省工程物探勘察院,浙江杭州,310005 |
| 基金项目： | 国家自然科学基金资助项目，生物地质与环境地质教育部重点实验室开放基金资助项目，西北农林科技大学人才引进基金资助项目 |
| 摘 要： | 为了开发利用轻量砂,在对国内外具有明确物理含义的土的破坏取值标准进行系统研究的基础上,通过三轴试验对轻量砂的抗剪强度特性进行研究.研究结果表明:土的破坏取值标准有变形标准和强度标准,二者统一于有效应力原理,都与孔压发展路径有密切关系.应力-应变曲线的软化、硬化是轻量砂剪胀和剪缩的外在表现,软化型宜采用最大有效主应力比或最大主应力差标准,二者不会导致轻量砂抗剪强度指标的显著差别,硬化型宜采用轴向应变15％标准.轻量砂的Mohr破坏包线形态是由其原生结构强度与围压共同决定的,当围压大于试样的结构屈服应力,破坏包线可以用直线表示.黏聚力和有效黏聚力随着EPS球粒掺入比的增大而减小,随着水泥掺入比和龄期增大而增大；内摩擦角和有效内摩擦角随着EPS球粒掺入比的增大而减小,随着水泥掺入比和龄期增大而增大.EPS球粒的空间置换效应与水泥的结点固化效应共同决定轻量砂的抗剪强度特性. |
| 关 键 词： | 轻量砂 抗剪强度 破坏取值标准 Mohr破坏包线 三轴试验 |
Triaxial compression test on shear strength characteristics of light weight sand |
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| HOU Tian-shun,XU Guang-li,LOU Jian-dong.Triaxial compression test on shear strength characteristics of light weight sand[J].Journal of Central South University:Science and Technology,2011,42(11). | |
| Authors: | HOU Tian-shun XU Guang-li LOU Jian-dong |
| Institution: | HOU Tian-shun1,2,XU Guang-li2,LOU Jian-dong3 (1.College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China,2.Key Laboratory of Biogeology and Environmental Geology of Ministry of Education,China University of Geosciences,Wuhan 430074,3.Zhejiang Engineering Geophysical Prospecting Institute,Hangzhou 310005,China) |
| Abstract: | To make use of light weight sand,soil failure criterions of definite physical meaning were researched,then shear strength characteristics of light weight sand were studied by triaxial compression test.The results show that there are two types of soil failure criterions: deformation criterion and strength criterion,the two are unified by effective stress principle,and they have close relation with pore pressure development path.Strain softening and strain hardening are external behavior of shear dilatancy-co... |
| Keywords: | light weight sand shear strength failure criterion Mohr failure envelope triaxial compression test |
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