层状岩体单轴和双轴压缩蠕变特性的数值试验

吉林大学学报(地球科学版)

层状岩体单轴和双轴压缩蠕变特性的数值试验

熊良宵^1,2，李天斌²，杨昌斌³，虞利军⁴

1.宁波大学建筑工程与环境学院, 浙江宁波315211;
2.成都理工大学地质灾害防治与地质环境保护国家重点实验室, 成都610059;
3.中冶集团武汉勘察研究院有限公司, 武汉430071;
4.浙江省岩土基础公司, 浙江宁波315040

收稿日期:2012-12-12 出版日期:2013-09-26 发布日期:2013-09-26
作者简介:熊良宵(1982-)，男，副教授,博士, 主要从事岩石力学与地下工程方面的教学与研究工作，E-mail:xiongliangxiao@nbu.edu.cn
基金资助:
国家自然科学青年基金项目(41002108)；国家自然科学重点基金项目(41230635)；地质灾害防治与地质环境保护国家重点实验室开放基金项目(SKLGP2011K008)；岩土钻掘与防护教育部工程研究中心开放研究基金课题(201104)

Numerical Analysis Study on Uniaxial and Biaxial Compression Creep Tests for Interlayered Rock Mass

Xiong Liangxiao^{1, 2}, Li Tianbin², Yang Changbin³, Yu Lijun⁴

1.Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo315211, Zhejiang, China;
2.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu610059, China;
3.Wuhan SurveyingGeotechnical Research Institute Co., Ltd. of MCC, Wuhan430071, China;
4.Zhejiang Geotechnical & Foundation Companay, Ningbo315040, Zhejiang, China

Received:2012-12-12 Online:2013-09-26 Published:2013-09-26

摘要/Abstract

摘要：

以绿片岩和大理岩组成的层状岩体为研究对象，采用FLAC3D对互层状岩体进行了单轴和双轴压缩蠕变试验的数值分析，在数值分析中考虑荷载方向与层理之间的几何关系、大理岩夹层的体积分数、应力水平等的影响。研究结果表明:单轴和双轴压缩条件下，随着夹层倾角由0°增加至90°，轴向和夹层倾斜方向的应变绝对值均呈先增大后减小的变化规律；随着大理岩夹层体积分数的增加，轴向压缩变形和2个侧向方向的膨胀变形量均有所减小。单轴压缩条件下，当轴向荷载方向垂直于层理时，轴向压缩变形均大于轴向荷载方向平行于层理时的轴向压缩变形；双轴压缩条件下，当轴向荷载方向垂直于层理、侧向荷载方向平行于层理时，轴向压缩变形最大，当轴向荷载方向平行于层理、侧向荷载方向垂直于层理时，轴向压缩变形最小。

关键词: 层状岩体, FLAC^3D, 多轴压缩, 蠕变特性

Abstract:

Taking the interlayered rock mass composed of greenschist and marble as study subject, numerical analysis on uniaxial and biaxial compression creep tests of interlayered rock mass was done by FLAC^3D. Lots of influencing factors such as geometric relationship between loading direction and layer, volumetric content of marble interlayer and stress level were taken into account in the numerical analysis. The research results show that the absolute values of axial strain and strain in the incline direction of interlayer increased firstly and then decreased when the dip angle of interlayer increased from 0° to 90° under uniaxial and biaxial compression states. Axial compressive deformation and dilatant deformation in the two lateral directions decreased with the increased volumetric content of marble interlayer under uniaxial and biaxial compression states. The axial compressive deformation when axial loading orientation was perpendicular to bedding plane was larger than that when axial loading orientation was parallel to bedding plane under uniaxial compression. The axial compressive deformation was the largest when axial loading orientation was perpendicular to bedding plane and lateral loading orientation was parallel to bedding plane, and was the smallest when axial loading orientation was parallel to bedding plane and lateral loading orientation was perpendicular to bedding plane.

Key words: interlayered rock mass, FLAC^3D, multi-axial compression, creep property

中图分类号:

TU45

熊良宵，李天斌，杨昌斌，虞利军. 层状岩体单轴和双轴压缩蠕变特性的数值试验[J]. 吉林大学学报(地球科学版), 2013, 43(5): 1539-1548.

Xiong Liangxiao, Li Tianbin, Yang Changbin, Yu Lijun. Numerical Analysis Study on Uniaxial and Biaxial Compression Creep Tests for Interlayered Rock Mass[J]. Journal of Jilin University(Earth Science Edition), 2013, 43(5): 1539-1548.

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