Experimental study on the mechanical properties of simulated columnar jointed rock masses
Experimental study on the mechanical properties of simulated columnar jointed rock masses
复制标题
模拟柱状节理岩体力学特性试验研究
DOI：
10.1088/1742-2132/12/1/80
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发表时间：
2015-02
影响因子：
1.4
通讯作者：
Cong-yan Wang
中科院分区：
文献类型：
--
作者：
Rong-gui Deng;Zhi-bin Zhong;Xiao-min Fu;Cong-yan Wang
柱状节理岩体是火成岩中常见的一种构造岩体。由于柱状节理网络的影响，柱状节理岩体的典型力学性质表现为各向异性，即变形和强度随加载方向的变化。对柱状节理岩体力学各向异性的正确认识是大坝等大型岩体工程论证和设计中必须解决的关键问题。采用石膏模拟柱状节理岩体试件，在单轴压缩条件下，对柱状节理岩体的力学各向异性进行了研究。试件与轴向应力成0° ~ 90°角，试件与轴向应力成0° ~ 90°角。试验结果表明，石膏模拟柱状节理岩体的力学各向异性随轴向应力的增大而增大，随轴向应力的增大而增大，随轴向应力的增大而减小。各向异性和失效模式。通过对试验结果的分析，发现柱状节理岩体的强度和变形具有明显的“U”型各向异性。在各向异性曲线中，最大值出现在β = 90°处，最小值出现在β = 45°处。研究还表明，侧向应变比相对较高，特别是当倾角接近（45° − j/2）时，其中j为节理摩擦角。采用经验公式预测了变形和强度的“U形”各向异性，预测的各向异性曲线与实验数据吻合较好。根据试验结果总结出四种不同的失效模式，并对相应的失效机理进行了探讨。
Columnar jointed rock mass is a kind of structural rock mass commonly encountered in igneous rocks. Due to the effects of columnar joint networks, anisotropy is the typical mechanical property of columnar jointed rock mass, i.e. deformation and strength varying with loading direction. Correct understanding of the mechanical anisotropy of columnar jointed rock mass is a key problem that should be solved for demonstration and design of large scale rock mass projects such as dams and underground cavern excavations constructed in it. Plaster simulated columnar jointed rock mass specimens at dip angles varying from 0° to 90° with respect to the axial stress were tested under uniaxial compression conditions to investigate the mechanical anisotropy and failure modes. Based on analyses of experimental results, it was found that the strength and deformation of columnar jointed rock masses had pronounced 'U-shaped' anisotropy. In the anisotropic curves, the maximum and minimum values occurred at β = 90° and β = 45°, respectively. It was also shown that the lateral strain ratio was relatively high, especially when the dip angle was close to (45° − j/2), where j was the joint friction angle. An empirical expression was adopted to predict the 'U-shaped' anisotropy of deformation and strength and the predicted anisotropic curves agreed reasonably well with experimental data. Furthermore, four types of failure modes were summarized based on experimental results and corresponding mechanisms were also discussed.
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DOI：
--
发表时间：
2009
期刊：
--
影响因子：
--
作者：
Liu Shungui
通讯作者：
Liu Shungui
影响因子：
2.4
作者：
A. Gudmundsson
通讯作者：
A. Gudmundsson
影响因子：
--
作者：
A. Toramaru;T. Matsumoto
通讯作者：
A. Toramaru;T. Matsumoto
影响因子：
1.5
作者：
Di Shengjie;Xu Wei-ya;Wang Wei;Wu Guan-ye
通讯作者：
Di Shengjie;Xu Wei-ya;Wang Wei;Wu Guan-ye
影响因子：
6.9
作者：
R. Bhasin;K. Høeg
通讯作者：
R. Bhasin;K. Høeg