Laboratory investigation of mechanical behavior of granite samples containing discontinuous joints through direct shear tests
Laboratory investigation of mechanical behavior of granite samples containing discontinuous joints through direct shear tests
复制标题
通过直剪试验对含有不连续节理的花岗岩样品的力学行为进行实验室研究
DOI：
10.1007/s12517-019-4278-3
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发表时间：
2019-02-01
影响因子：
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通讯作者：
Kulatilake, Pinnaduwa H. S. W.
中科院分区：
文献类型：
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作者：
Yang, Xu-Xu;Kulatilake, Pinnaduwa H. S. W.
通过室内直剪试验，研究了正应力和节理持久性对含不连续节理花岗岩试样力学性能的影响。试验结果显示，岩石桥发生三种不同的破坏模式：(a)剪切破坏，(b)压剪破坏，(c)拉伸破坏。破坏模式取决于节理的持久性和正应力水平，并影响峰值抗剪强度。此外，节理的持久性和正常应力水平对基于岩桥面积的断裂粗糙度和残余抗剪强度等破坏后行为也有相当大的影响。该研究有助于更好地了解岩桥对花岗岩不连续节理力学行为的影响，从而估计岩桥的抗压能力，从而评估岩石工程中地表和地下开挖岩体的稳定性。
The effect of the normal stress and joint persistency on the mechanical behavior of granite samples containing discontinuous joints was investigated in the laboratory through direct shear tests. The test results revealed three different failure modes occurring at the rock bridge: (a) shear failure, (b) compressive-shear failure, and (c) tensile failure. The failure mode depends on the joint persistency and normal stress level and influences the peak shear strength. Moreover, the joint persistency and normal stress level were also found to have a considerable influence on the post-failure behavior such as the fracture roughness and residual shear strength based on rock bridge area. The conducted investigation provided better understanding of the effect of a rock bridge on mechanical behavior of granitic discontinuous joints towards estimating the resistance capacity of rock bridges and hence to allow evaluation of stability of rock masses in both surface and underground excavations in rock engineering.