摘要
深圳地铁5号线暗挖段下穿老梅子园密集浅基础建筑物,该处地层富水软弱,属于VI级围岩,地层变形不易控制。为确保隧道暗挖施工及地表建筑物安全,采用超前大管棚加固地层、旋喷桩连续隔断墙和地表跟踪注浆等技术措施控制地层变形。其中,管棚加固用以增加地层支护刚度,减小开挖对周围土体的扰动;旋喷桩墙限制隧道开挖的横向影响;地表跟踪注浆改善土层的力学性能,提高土体的压缩强度。地表监测表明,上述措施有效控制了暗挖段开挖过程中的地层变形,使隧道得以顺利通过该区域。
The Shenzhen Metro Line 5 is excavated under crossing the Old-Plum Garden with shallow foundation intensive buildings. The surrounding rocks are extremely fractured, and belonging to category-VI. Deformation of soil layers is not easy to control during tunnel excavation. In order to guarantee the safety of construction and surface buildings, leading steel pipeline shed, rotary jet grouting pile and surface tracing compensation grouting are taken during tunnel construction. The leading steel pipeline shed plays a role of increasing the stiffness of the support and reducing the disturbance to the surrounding soil. The ro- tary jet grouting pile limits the lateral deformation of tunnel excavation. The surface tracing compensation grouting improves the mechanical properties of the soil layer and improves the compressive strength of the soil. Strata deformation requirement in the process of excavation of the underground running period has been effectively controlled. It makes subway tunnel running off through the area successfully.
作者
李洪庆
LI Hongqing(Shenzhen Metro Group Co. , Ltd. , Shenzhen 518026, China)
出处
《土工基础》
2017年第2期115-119,共5页
Soil Engineering and Foundation
关键词
地铁隧道
暗挖法
软弱土层
地表沉降
变形控制
subway tunnel
mining method
weak soil layer
ground settlement
deformation control