A Shear Strength Estimation Model of Weathered Sawtooth Structural Planes Based on Barton Formula
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摘要: 针对传统的室内剪切试验获取结构面剪切强度的方法存在周期长、人为因素影响大,同时现有研究提出的锯齿形结构面剪切强度估算模型也没有考虑风化作用影响的问题,通过开展结构面风化模拟、室内剪切及回弹试验,根据试验结果对Barton公式进行改进,建立考虑风化作用影响的估算模型。研究结果表明:以锯齿形结构面起伏角和波速比分别具体化粗糙度系数mJRC和岩壁抗压强度σJCS,得到起伏角与mJRC之间、波速比与σJCS之间均存在指数关系;在Barton公式的基础上,建立了考虑风化作用影响的锯齿形结构面剪切强度估算模型,并利用试验数据通过了检验。Abstract: The method for obtaining the shear strength of structural planes through traditional indoor shear tests has the problems such as long period and significant influence of human factors. At the same time, the shear strength estimation model of sawtooth structural planes proposed by the existing research does not consider the influence of weathering. Through the weathering simulation tests, indoor shear tests and rebound tests of structural planes, the Barton formula was improved according to the test results, and the estimation model considering the influence of weathering was established. The results showed that the roughness coefficient (mJRC) and the rock wall compressive strength (σJCS) were specified by the undulating angle and the wave velocity ratio of the sawtooth structural plane, respectively. There was an exponential relations between the undulating angle and mJRC, and between the wave velocity ratio and σJCS. Based on the Barton formula, a shear strength estimation model of sawtooth structural plane considering the influence of weathering was established and verified by experimental data.
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Key words:
- sawtooth structural plane /
- weathering /
- shear strength /
- Barton formula /
- estimation model
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