摘要
分析了长沙地铁二号线沿线地层特征,以及盾构施工状况,基于长沙地铁土压平衡盾构穿越典型地层100多个地表沉降观测断面大量的地表沉降实测数据的统计分析,探讨采用Peck公式预测长沙地铁施工引起的地表横向沉降槽的可行性,得出了预测长沙地铁土压平衡盾构施工引起的地表沉降基本参数的取值范围,即地表沉降槽宽度系数(K)0.3-0.6,地层损失率0.5%-1.25%。应用本文获得的地表移动参数,采用Peck公式可以较好预测长沙地铁施工引起的地表沉降,及其对于邻近结构物的影响。
The characteristics of the strata along Changsha Metro No.2 and the EPB shield are analyzed in this paper. Based on lots of measured settlement data of over 100 monitoring sections from Changsha Metro constructed by EPB shield,the features of the settlement trough induced by the tunneling were analyzed,and whether the Peck formation is adapted to Changsha Metro was discussed in this paper. The range of basic parameters for ground settement were obtained. The width coefficient（ K） of settlement trough is in range from 0.3 to 0.6,and ground loss ratio（ Vl）is less than 1.25% according to numerous analyses. Using the ground surface movement parameters and Peck formation,the ground surface settlement due to shield tunneling in Changsha areas,and its impacts on adjacent structures can be predicted fairly well.
出处
《地下空间与工程学报》
CSCD
北大核心
2016年第1期181-187,共7页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(51208516)
"十二五"国家科技支撑计划课题(2012BAK24B02)
关键词
土压平衡盾构
地铁
地表沉降
沉降槽
EPB shield
subway
ground surface settlement
settlement trough
