粉性土中土压平衡盾构施工的扰动影响

Earth Pressure Balance Shield Tunnelling-Induced Disturbance in Silty Soil

结合上海轨道交通明珠线二期工程“溧阳路站—临平路站”区间盾构推进工程,进行静力触探试验、超孔隙水压力测量以及地面沉降的量测.从上述不同角度,分析了EBP(土压平衡)盾构在粉性土中推进对土体扰动、变形的影响,研究了受影响区域土体静力触探强度、超孔隙水压力随着时间的变化趋势及随之表现出来的地面变形趋势,得出了超孔隙水压力发展的规律及经验公式,并总结分析了三者之间的相互关系.为今后盾构施工扰动的分析及控制提供有益的参考.

Through in-situ tests of cone penetration test, pore pressure monitoring and subsidence surveying of the tunneling project of the second stage construction of Shanghai Pearl Line between Liyang Road Station and Linping Road Station,an analysis is made of the disturbance and deformation mechanism of earth pressure balance（EPB） shield tunneling, cone penetrating strength and pore pressure which change with time and subsequent ground deformation. As a result,the developing law and empirical formula of pore pressure are obtained. An analysis is also made of the relationship among distance （between shield excavation face and monitoring point）, pore pressure and parameters related to soil, depth and shield driving velocity, the result of which will present a good reference for similar projects.