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Influence of temperature and roughness of surrounding rocks on mechanical behavior of rock bolts

机译：围岩温度和粗糙度对锚杆力学性能的影响

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摘要

In order to solve the degradation problem of rock bolts and the safety of a support structure for a high geothermal tunnel in a dry heat environment, various tensile tests of rock bolts were conducted at different temperatures and different levels of roughness of the surrounding rocks in this paper. The roughness of the surrounding rocks was simulated through different types of steel tubes, and dry heat environment was simulated through different temperatures of a drying oven. Based on the first interface (bolt to grout interface) and the second interface (grout to pipe interface) pullout tests, the load-displacement curves of rock bolts were obtained at different temperatures and roughness. The results showed that temperature had little effects on the failure mode, but roughness of the surrounding rock had a great influence on the pullout strength. With an increase in roughness, the tensile strength increased, and the bolting effect was enhanced. For the non-threaded specimens, the interface bond strength of the first interface was larger than that of the second interface, and the second interface showed a kind of shear failure. Finally, it was revealed that the dependence of ultimate tensile force on temperature and roughness of surrounding rocks obeyed a cubic and quadratic polynomial function, respectively.
机译：为了解决干热环境下高地热隧道的锚杆退化问题和支撑结构的安全性，在不同温度和不同围岩粗糙度下进行了各种锚杆拉伸试验。纸。通过不同类型的钢管模拟了围岩的粗糙度，并通过不同的烘箱温度模拟了干热环境。根据第一界面（螺栓至灌浆界面）和第二界面（灌浆至管道界面）拉拔试验，获得了在不同温度和粗糙度下岩锚的载荷-位移曲线。结果表明，温度对破坏模式的影响很小，但围岩的粗糙度对拉拔强度的影响很大。随着粗糙度的增加，抗拉强度增加，并且螺栓连接效果增强。对于无螺纹试样，第一界面的界面结合强度大于第二界面，第二界面表现出一种剪切破坏。最后，揭示了极限拉伸力对围岩温度和粗糙度的依赖性分别服从三次多项式和二次多项式函数。

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