基坑开挖过程中TJ-1模拟月壤变形特性的试验研究

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摘要采用空心圆柱扭剪仪对TJ-1模拟月壤试样进行基坑开挖应力路径的试验模拟，以研究地球重力场环境下TJ-1模拟月壤在地基开挖过程中的变形及非共轴特性。试验结果表明：应力路径对TJ-1模拟月壤的变形影响显著；开挖过程中坑底及连续墙外侧模拟月壤因变形过大而破坏，坑底位置土体受连续墙挤压的影响发生明显的剪缩现象；连续墙内外土体明显的非共轴现象是开挖所致偏应力、应力主轴转幅及旋转速率耦合作用的结果，且上述因素在不同位置影响程度也不相同，坑底位置以应力主轴的转幅及旋转速率的影响为主，基坑外侧则是偏应力比、转幅及旋转速率共同作用的结果。

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	蒋明镜
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关键词 ： TJ-1模拟月壤, 基坑开挖, 应力路径, 空心圆柱扭剪仪, 变形特性, 非共轴

Abstract：Torsion shear tests are conducted by use of a dynamic hollow cylinder apparatus in Tongji University on the TJ-1 lunar soil simulant subjected to stress paths of excavation in order to investigate its deformation behaviors and non-coaxiality during the excavation under the earth environment. The test results indicate that (1) the stress path significantly affects the deformation behaviors of the TJ-1 lunar soil simulant; (2) the soils at the bottom of the pit and outside the diaphragm walls fail due to large deformation; (3) the soils at the bottom exhibit a tendency of contraction; (4) the soils adjacent to the diaphragm walls show remarkable non-coaxiality due to the coupled effects of stress ratio, rotation amplitude and rotation rate of the principal stress; and (5) the non-coaxiality of soils at the bottom of the pit is mainly affected by the rotation amplitude and rotation rate of the principal stress direction, while the non-coaxiality of soils outside the wall is controlled by the stress ratio, rotation amplitude and rotation rate of the principal stress direction.

Key words： TJ-1 lunar soil simulant excavation stress path hollow cylinder apparatus deformation behavior non-coaxiality

收稿日期: 2011-08-10

TU411

基金资助:

国家杰出青年基金项目（51025932）；国家自然科学基金项目（10972158，51179128）；上海市优秀学术带头人计划（11XD1405200）

作者简介: 蒋明镜(1965– )，男，教授，博士生导师，主要从事天然结构性黏土、砂土、非饱和土、太空土、深海能源土的宏微观试验、本构模型和数值分析方面的研究以及土体逐渐破坏分析。E-mail: mingjing.jiang@tongji.edu.cn。

引用本文:

蒋明镜,李立青,刘芳,苏佳兴. 基坑开挖过程中TJ-1模拟月壤变形特性的试验研究[J]. 岩土工程学报, 2012, 34(7): 1176-1183. JIANG Ming-jing, LI Li-qing, LIU Fang, SU Jia-xing. Deformation behaviors of TJ-1 lunar soil simulant during excavation. Chinese J. Geot. Eng., 2012, 34(7): 1176-1183.

链接本文:

http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2012/V34/I7/1176

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