回头沟隧道偏压段围岩与初衬间压力监测结果分析

相比于一般隧道，偏压隧道常常位于隧道洞口浅埋段，其围岩破碎，地质环境条件差，围岩荷载不对称，给隧道施工和稳定性带来一定影响。以回头沟隧道为依托工程，在洞口段选择监测断面，根据隧道围岩与初衬间压力的监测结果，分析围岩压力的大小、变化规律；分析是否存在偏压现象及隧道的稳定性，得出了相应的结论。

Analysis of Pressure Monitoring Results between Surrounding Rock and Early Lining of Bias Section of Huitougou Tunnel

Compared with the general tunnel, the bias tunnel is often located in the shallow buried section of the hole, with broken surrounding rock, poor geological conditions and asymmetric surrounding rock load, bringing some impact to the tunnel construction and stability. Based on the Huitougou tunnel project, selecting the monitoring section in the hole section, the surrounding rock pressure and its variation law are analyzed according to the monitoring results of the pressure between the surrounding rock and the lining of the tunnel. And whether there is bias phenomenon and the stability of the tunnel are also analyzed, and corresponding conclusions are drawn.