上软下硬地层中土仓压力变化对地表变形的影响研究

RESEARCH ON INFLUENCE OF CHANGE OF SILO WAREHOUSES PRESSURE ON GROUND SETTLEMENT IN UPPER-SOFT AND LOWER-HARD STRATA

以深圳地铁14号线大~宝区间盾构工程为依托,研究在不同土仓压力下上软下硬地层地表沉降变形影响规律。为解决上软下硬地层条件下盾构不同土仓压力对地表的变形问题,提高土仓压力设置的准确性,从现场实际工况入手,结合现场实际地层情况,建立上软下硬地层模型,计算现场地表纵向和横向方向的地表沉降规律,并根据现场检测情况,为盾构穿越上软下硬地层提供土仓压力控制标准。

Based on the shield construction of Da Bao section of Shenzhen metro line 14,this paper studies the influence of different earth pressure on the surface settlement and deformation of the upper soft and lower hard strata.In order to solve the problem of surface deformation caused by diferent silo pressures of shield under the condition of upper soft and lower hard stratum,and improve the accuracy of silo pressure setting,this paper starts with the actual working conditions of the site and combines with the actual stratum conditions of the site,establishes the upper soft and lower hard stratum model,calculates the ground settlement laws in the longitudinal and transverse directions of the site surface,and according to the on-site detection conditions,carries out shield crossing The upper soft and lower hard strata provide the control standard of the earth bin pressure.