饱和灰砂岩水-力耦合松弛特性试验研究

冯聪; 余健; 徐云霞; 朱其志; 张瑨

doi:10.13204/j.gyjzG20122807

饱和灰砂岩水-力耦合松弛特性试验研究

doi: 10.13204/j.gyjzG20122807

冯聪^1,2,
余健³,
徐云霞⁴,
朱其志^1,2, ,,
张瑨^1,2

1. 河海大学岩土力学与堤坝工程教育部重点实验室, 南京 210098;
2. 河海大学岩土工程科学研究所, 南京 210098;
3. 中国电建集团华东勘测设计研究院有限公司, 杭州 310014;
4. 南京地铁集团有限公司, 南京 210008

基金项目:

国家自然科学基金项目（51679068，11902111）；国家重点研发计划项目（2017YFC1501100）。

详细信息

作者简介:
冯聪,男,1997年出生,硕士研究生。

通讯作者:
朱其志,男,1979年出生,博士,教授,博士生导师,qizhi_zhu@163.com。

计量
- 文章访问数: 75
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- PDF下载量: 1
- 被引次数: 0
出版历程
- 收稿日期: 2020-12-28
- 网络出版日期: 2021-11-10
- 刊出日期: 2021-11-10

EXPERIMENTAL STUDY ON HYDRO-MECHANICAL COUPLING RELAXATION CHARACTERISTICS OF SATURATED SANDSTONE

FENG Cong^1,2,
YU Jian³,
XU Yunxia⁴,
ZHU Qizhi^{1,2
, ,},
ZHANG Jin^1,2

1. Key Laboratory of Ministry of Education for Geomechanics&Embankment Engineering, Hohai University, Nanjing 210098, China;
2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China;
3. Huadong Engineering Corporation Limited, China Power Engineering Consulting Corporation, Hangzhou 310014, China;
4. Nanjing Metro Group Co. Ltd., Nanjing 210008, China

摘要

摘要: 岩石水-力耦合松弛特性是影响硐室围岩工程长期安全稳定的关键因素之一。采用岩石多场耦合三轴试验系统，对饱和灰砂岩在水力耦合条件下的有效围压规律及应力速率依存性开展应力松弛试验，并根据松弛特点选用三单元广义Maxwell松弛本构模型进行数值模拟验证。结果表明：1）水-力耦合条件下饱和砂岩具有非完全衰减松弛特性；2）相同有效围压条件下，无孔压试样的松弛程度略低于有孔压试样，而稳态松弛速率只有有孔压试样的45%左右；3）砂岩水-力耦合松弛具有显著的速率相关性，松弛程度和初始松弛速率均随加载速率升高而增大，最高加载速率试样的初始松弛速率几乎为最低加载速率试样的6倍，而稳态松弛速率没有明显差异；4）三单元广义Maxwell松弛本构模型能较为准确地描述砂岩水-力耦合松弛全过程。
- 砂岩 /
- 松弛 /
- 岩石流变 /
- 水-力耦合 /
- 松弛本构模型
Abstract: The hydro-mechanical coupling relaxation characteristics is one of the key factors for long-term safety and stability of surrounding rocks. The hydro-mechanical coupling tests on effective confining pressure laws and sensitivity loading rates of saturated grey sandstone were conducted by the multi-field coupling triaxial test system. According to the relaxation characteristics, the generalized Maxwell relaxation constitutive model with three elements was adopted for the implementation of numerical verifications. The results showed that: 1) In the condition of hydro-mechanical coupling, saturated sandstone had the characteristics of incomplete attenuation relaxation. 2) Under the same effective confining pressure, the relaxation degrees of specimens without pore water pressure were slightly lower than that with pore pressure, while relaxation rates in the steady state were only about 45% of that with pore pressure. 3) The relaxation characteristics of sandstone depended significantly on loading rates. The relaxation degrees and initial relaxation rates increased with loading rates, in which the initial relaxation rates of specimens with the highest loading rate were almost six times rates for specimens with the lowest loading rate, while the relaxation rates in the stead state were no obvious different. 4) The whole process of hydro-mechanical coupling relaxation of sandstone could be accurately described by the three element generalized Maxwell relaxation constitutive model with three elements.
- sandstone /
- relaxation /
- rock rheology /
- hydro-mechanical coupling /
- relaxation constitutive model

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