盾构施工引起超孔隙水压力变化分析研究

Study on the Excess Pore Water Pressure Caused by Shield Tunneling

以上海市轨道交通10号线3标段国权路站～同济大学站区间工程为背景,对盾构在下立交底板下长距离推进时引起的超孔隙水压力进行了监测和分析。采用解析公式计算盾壳正上方超孔隙水压力并与实测值做了对比,表明塑性区的范围和塑性区内超孔隙水压力的主要影响因素是盾构土舱压力,但弹性区的超孔隙水压力最大值为a槡6Cu,与土舱压力无关。通过超孔隙水压力的监测可以指导土舱压力的调整,避免过大的沉降。

Based on the Line 10.3d bid-section of urban rail transit of Shanghai,this paper analyzed the monitoring results of excess pore water pressure caused by shield tunneling under the slab of underpass.Comparing the monitoring results with analytical solutions,considering that the main reason of pore water pressure variation in plastic zone is earth pressure of soil cabin,the maximum excess pore water pressure in elast ic zone is a √6 Cu.The earth pressure of soil cabin can be changed based on the monitoring results in order to avoid large settlement.