【摘要】：針對(duì)新疆某高地溫環(huán)境下的圓形隧洞,采用有限元分析程序,分別對(duì)不同圍巖半徑下的溫度場(chǎng)分布進(jìn)行模擬,并以不同圍巖半徑下圍巖與支護(hù)接觸面處的溫度作為圍巖合理計(jì)算范圍取值的參考,結(jié)合有關(guān)理論分析的結(jié)果,確定出圍巖最佳計(jì)算半徑。在此基礎(chǔ)上進(jìn)一步研究隧洞施工期圍巖溫度、應(yīng)力和位移場(chǎng)在熱—應(yīng)力耦合作用下的分布問題。研究結(jié)果表明,當(dāng)圍巖外部溫度為80℃、隧洞內(nèi)部溫度為5℃時(shí),隧洞開挖后考慮溫度和應(yīng)力共同影響下的圍巖最佳計(jì)算半徑為24 m。隧洞圍巖溫度沿圍巖厚度方向呈非線性遞增變化。與常溫(20℃)情況相比,高地溫的存在會(huì)使隧洞圍巖最大主應(yīng)力減小,同時(shí)也會(huì)在隧洞拱頂和底拱處產(chǎn)生拉應(yīng)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，

本文編號(hào)：2506992