高地温引水隧洞围岩热——应力耦合分析

发布时间：2019-06-27 17:22

【摘要】：针对新疆某高地温环境下的圆形隧洞,采用有限元分析程序,分别对不同围岩半径下的温度场分布进行模拟,并以不同围岩半径下围岩与支护接触面处的温度作为围岩合理计算范围取值的参考,结合有关理论分析的结果,确定出围岩最佳计算半径。在此基础上进一步研究隧洞施工期围岩温度、应力和位移场在热—应力耦合作用下的分布问题。研究结果表明,当围岩外部温度为80℃、隧洞内部温度为5℃时,隧洞开挖后考虑温度和应力共同影响下的围岩最佳计算半径为24 m。隧洞围岩温度沿围岩厚度方向呈非线性递增变化。与常温(20℃)情况相比,高地温的存在会使隧洞围岩最大主应力减小,同时也会在隧洞拱顶和底拱处产生拉应力。
[Abstract]:Aiming at a circular tunnel in Xinjiang under high ground temperature environment, the temperature field distribution under different surrounding rock radii is simulated by finite element analysis program, and the temperature at the contact surface between surrounding rock and support under different surrounding rock radius is taken as the reference for the reasonable calculation range of surrounding rock. Combined with the results of relevant theoretical analysis, the optimum calculation radius of surrounding rock is determined. On this basis, the distribution of temperature, stress and displacement field in surrounding rock during tunnel construction under the action of heat-stress coupling is further studied. The results show that when the external temperature of surrounding rock is 80 鈩，

本文编号：2506992