Characteristic Study on Surface Settlement of Construction of Parallel Stacking Subway Intervals
The north side of a subway interval excavated section project in Beijing is a single-span double-layer vault straight wall section constructed by PBA method;The south side is a double-hole stacked-fall standard section,which the upper layer is constructed by CRD method,and the lower layer is constructed by step method.Therefore,numerical simulation analysis was carried out by finite element software to investigate the effects of subway interval construction on longitudinal and transverse surface settlements under four different construction sequences,namely,"small before large"+"down before up","small before large"+"up before down","large before small"+"down before up",and"large before small"+"up before down".The results show that the surface settlement caused by the construction sequence of"big first,then small"+"first down,then up"is the smallest in this project.This research result can provide reference for the control of surface deformation in similar projects.
国家科技期刊平台
NSTL
万方数据
维普
