浅埋暗挖矩形区间隧道临时支护拆除方案比选

以昆明地铁3号线金太区间隧道工程为例，采用现场监控量测与数值模拟相结合的方法，分析了3种浅埋暗挖矩形区间隧道临时支护拆除方案对隧道结构安全稳定性的影响，得出了目标断面隧道结构的顶板下沉、水平收敛、地表沉降及安全性系数在拆除临时支护前后的变化规律，引入位移变化率指标，分析对比了临时支护拆除方案的优劣，确定了适用于浅埋暗挖矩形隧道临时支护的间隔拆除方法，并采用现场监测数据验证了其可行性。

Comparison of Temporary Support Demolition Program for Shallow-buried Excavation Rectangular Running Tunnel

The influence of the three temporary support demolition programs for shallow-buried excavation rectangular running tunnel to the safety stability of tunnel structure is analyzed with the method of combining site monitoring and measurement and numerical simulation based on the Jintai Running Tunnel Project of Kunming Metro Line 3, obtaining the variation rules of the roof subsidence, horizontal convergence, ground settlement and safety factor of the tunnel structure of the target section before and after the temporary support demolition, introducing the displacement change rate index, analyzing and comparing the advantages and disadvantages of the temporary support demolition program and determining the interval demolition method applicable to the temporary support of the shallow-buried excavation rectangular tunnel which is verified to be feasible by adopting the site monitoring data.