Abstract
Many factors influence the shear resistance of rock joints. Among them, the above overburden load is the most important factor. The uneven thickness of the overburden causes the joints to be subjected to the nonuniform distribution load. While the peak shear strength shows nonlinear relationship with normal stress, linear superposition cannot be used to calculate the overall shear resistance of joint under nonuniform normal stress distribution. In this paper, the nonlinear shear strength model, JRC‐JCS model, is applied to study the overall shear resistance of the joint under four nonuniform distribution patterns of normal stress. The results show that when the normal stress is distributed in a nonuniform way, the shear resistance provided by rock joint as a whole decreases with the increase of the normal stress distribution interval. Given the nonuniform distribution of normal stress along the joint, the shear resistance obtained by the Mohr‐Coulomb linear model is overestimated. In order to give full play to the overall shear performance of the joint, the shear strength at different positions on the joint should be as close as possible. Then, the shear strength of joint parts can enter peak state condition simultaneously, at which time the shear strength is fully exerted.
Highlights
Strength matches the characteristics of the joint surface; the overall shear capacity of a joint can be obtained, and mechanical analysis can be contacted by applying the limit equilibrium method
Indraratna et al [20] proposed a new nonlinear shear strength criterion based on JRC-JCS model, which considers the influence of normal stress level and asperity features; the nonuniform distribution of normal stress along the joint is not considered in its application
Owing to the nonuniform distribution of normal stress along the joint and the nonlinear shear strength, which is closely related to joint morphology, normal stress level, and material properties [23,24,25,26], linear superposition cannot be used for shear resistance calculation of joints. e different distributions of normal stress on a joint correspond to varying degrees of shear resistance. is study investigates the shear resistance of joints based on nonlinear shear strength criterion at different nonuniform normal stress distributions. e results are compared with those of the traditional linear shear strength model, Mohr–Coulomb criterion
Summary
Hang Lin ,1 Hu Wang ,1,2 Yifan Chen, Rihong Cao ,1 Yixian Wang ,3 Rui Yong ,4 and Shigui Du4. While the peak shear strength shows nonlinear relationship with normal stress, linear superposition cannot be used to calculate the overall shear resistance of joint under nonuniform normal stress distribution. The nonlinear shear strength model, JRC-JCS model, is applied to study the overall shear resistance of the joint under four nonuniform distribution patterns of normal stress. Given the nonuniform distribution of normal stress along the joint, the shear resistance obtained by the Mohr-Coulomb linear model is overestimated. Ere are many factors influencing the shear resistance of joints in rock mass, such as thickness of overburden, joint roughness, filling condition, and occurrence of rock strata. To obtain the shear strength of a whole joint, shear strength should be derived at different normal stress levels Such condition necessitates the establishment of a nonlinear shear strength model to characterize shear behavior. Shear strength of joints is independent of normal stress level [21, 22], but only a portion of this
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