富水卵漂石地层盾构隧道地表沉降特征试验分析

Test and Analysis of Ground Surface Settlement Characteristics under Shield Tunneling of Rich Water Content Cobble Stratum

卵漂石地层周围岩土介质具有高度非线性的特点,导致盾构施工引起地表沉降规律与软土地区盾构引起的沉降规律有着明显不同。文章基于成都地铁4号线西沿线土压平衡盾构隧道区间的地表沉降的实际观测数据,对地表沉降的横向沉降变形规律和横向沉降槽进行分析,对比软土地区盾构隧道地表沉降槽特性,分析了卵漂石地层盾构隧道地表沉降曲线,总结了富水卵漂石盾构隧道地表沉降槽窄而深的特点。

The cobble stratum surrounding rock and soil has highly nonlinear characteristics, leading to a markedly difference of surface subsidence patterns in shield tunneling and settlement patterns caused by shield excavation in soft soil area. Based on the actual observation data of ground surface settlement along the line in the west of the earth pressure balance shield tunneling of Chengdu metro line 4, the paper makes analysis on the surface settlement of transverse settlement deformation pattern and transverse settlement trough and comparison of ground surface settlement slot characteristics by shield tunneling in soft soil area, ground surface settlement curve by shield tunneling in cobble stratum, and it summarizes the characteristics of ground surface settlement with narrow and deep trough in rich water content cobble by shield tunneling.