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针对岩体结构面动态剪切问题,总结了国内外能用于测试岩体结构面动态剪切强度特性的直剪试验仪和相关室内试验研究现状:目前国内外能用于测试岩体结构面动态剪切强度特性的仪器不多,且仪器指标参数如剪切速率、法向应力加载条件以及试样尺寸变化范围等无法完全满足相关试验要求;对于剪切速率较低的定速率剪切试验,人工岩体结构面峰值抗剪强度随剪切速率的变化而变化,且变化趋势因结构面硬度等物理力学性质的不同而不同,变化幅度随法向应力的增大而增大、随初始起伏度的增大而增大、随循环次数的增加而减小;天然岩体结构面动态剪切试验较少,较高剪切速率和变速率剪切试验数据不足,未见尺寸效应和壁岩强度对结构面动态剪切强度影响的试验成果.研发新的岩体结构面动态剪切强度特性测试的室内试验系统是未来岩体结构面动态剪切问题研究的必由之路.
In view of the dynamic shear of rock mass structural plane, the direct shear testers and relevant indoor experimental research status that can be used to test the dynamic shear strength of rock mass structural plane are summarized. At present, Dynamic shear strength characteristics of the instrument is small, and the instrument parameters such as shear rate, normal stress loading conditions and sample size range can not fully meet the requirements of the relevant test; for the lower shear rate shear rate constant rate test , The peak shear strength of artificial rock mass structure surface changes with the shear rate, and the change trend is different due to different physical and mechanical properties such as the hardness of the structure surface. The variation range increases with the increase of normal stress, The undulating degree increases and decreases with the increase of the number of cycles; the dynamic shear test of natural rock mass structure surface is less, the data of high shear rate and rate shear test are not enough, and no size effect and wall rock Strength on the dynamic shear strength of the structure of the test results.Research and development of a new test of structural properties of rock mass dynamic shear strength of the indoor test system is the future dynamic shear surface structure The only way to study the problem.