中文摘要：

为分析深埋软岩大变形偏压公路隧道变形与荷载作用特征,以成武高速武都西隧道工程为依托,选取2处典型断面开展现场测试工作,研究衬砌变形及围岩与第1层初支间的接触压力、第2层初支与第1层初支间的接触压力、第2层初支与二衬间的压力随时间的变化规律及分布特征。最后,将变形结果与现有规范进行了对比。结果表明：现有公路隧道的收敛稳定判别标准对于深埋软岩大变形偏压公路隧道难以适用;深埋软岩大变形偏压公路隧道围岩压力分布的＂猫耳朵＂特征不明显,而是呈现出与岩层走向一致的椭球形压力分布形态;其偏压公路隧道第1层初支、第2层初支全部受压、二衬支护结构局部受拉;从里到外3层支护结构分担平均压力比例分别为58%、13%、29%,且在支护结构不同部位3层支护结构围岩压力分担比例差异较大。

英文摘要：

In order to analyze the deformation and load characteristics in highway tunnel which is in deep buried soft rock and undertakes a large deformation bias,2typical sections were selected to carry out the in situ test work based on the Wuduxi Tunnel of Chengwu Expressway.The time-dependent deformation laws and distribution characteristics of the contact pressures between lining deformation,surrounding rock and the first layer of early support,the second layer of early support and the first layer of early support,and the second layer of early support and secondary lining were investigated.And the deformation results with current specifications were compared.The results show that the current discriminating standard of convergence and stability in highway tunnel is hard to apply to deep highway tunnel which is in deep buried soft rock and undertakes a large deformation bias.The＂cat ear＂characteristic of surrounding rock＇s pressure distribution in deep highway tunnel which is in soft rock and undertakes a large deformation bias is not clear,but it displays a pressure distribution pattern which is spheroidicity and consistent with rockstratum trends.In the bias highway tunnel the first and second layers of support are all under pressure and the supporting structure of secondary lining is partly in tension.The pressure proportions that the three layers of supporting structures share are 58%,13%,29% on average from inside to outside,and in the different parts of the supporting structures,the pressure proportions that the three layers of supporting structures＇ surrounding rocks share are quite different.