河惠莞高速公路佳龙嶂隧道浅埋段围岩变形分析

Deformation Analysis of Surrounding Rock in Shallow Buried Section of Jialongzhang Tunnel of Hehuiguan Expressway

通过对河惠莞高速公路佳龙嶂隧道冲沟浅埋段在隧道成型后围岩的位移进行现场监测,分析浅埋隧道在开挖过程中围岩的变形情况.结果表明:浅埋隧道开挖后围岩的变形通常可分为加速变形、等速变形和缓慢变形3个阶段;掌子面的推进将对后方约40m范围内的周边围岩变形产生持续影响.

By monitoring the displacement of the surrounding rock of Jialongzhang Tunnel of Hehuiguan Expressway after the shallow tunnel is formed,the deformation of the surrounding rock during the excavation of the shallow tunnel is analyzed.The analysis results show that the deformation of surrounding rock after the shallow tunnel excavation can be divided into three stages:accelerated deformation,constant velocity deformation and slow deformation.The advancing of the face will have a lasting impact on the surrounding rock deformation within the range of about 40 meters behind.