深圳区间地铁隧道施工引起地表沉降规律的研究

本文通过对深圳地铁一号线西乡一固戍区间单线和双线隧道盾构法施工引起的地表沉降分析,总结了复杂地质条件下,隧道埋深、地质条件、注浆量、施工参数等因素对地表沉降的影响.随着隧道埋深增大,地表沉降影响范围增大,而地表的最终沉降量逐渐减小.淤泥质层、富水砂层、粉质黏土层受到扰动后稳定缓慢,后期固结和蠕变残余形变引起沉降相对较慢,沉降量较大.注浆量充足,使隧道临时支护结构稳定,地表沉降变化平缓,最终沉降量小.

Study on Ground Surface Settlement Regularity Induced by Construction of Running Tunnel of Shenzhen Metro

This article analyzed the surface subsidence caused by shield method of the Shenzhen subway No.1 line of Xixiang—Gushu single track and twin track tunnel and summarized tunnel buried depth,geological conditions,grouting quantity,construction parameters and other factors which can affect surface settlement in the complex geological conditions.With the tunnel buried depth and the extent of surface settlement increasing,the final settlement of the surface decreases.Silt layer,water-rich layer,salty clay layer became stable slowly after disturbing;the speed of settlement is relatively slow and remains a large quality caused by post-consolidation and residual creep deformation.If the grouting is adequate,the temporary support of the tunnel structure is stable,the variation of surface settlement is smooth,and the final settlement remains a small amount.