盾构隧道垂直下穿暗涵的沉降影响研究

Settlement Effect Study on Shield Tunnel Vertically Underpassing a Buried Culvert

以北京地铁十号线二期11标六里桥站—莲花桥站区间隧道为例,采用数值模拟和现场监测相结合的方法,对新建盾构隧道垂直下穿暗涵时产生的沉降进行研究,模拟盾构掘进过程中、盾构完全通过后,暗涵底部及对应地面产生的沉降,分别得到相应的沉降最大影响区域,暗涵底部最大沉降值为11.6 mm,地表最大沉降值为5.3 mm,通过现场监测与数值计算结果对比分析,二者结果均比较接近,说明数值模型的合理性。且实际监测最大值为4.7 mm,满足5 mm的控制标准,说明施工过程中采取的措施是有效合理的。

Taking the tunnel in the interval between the Liuliqiao Station and the Lianhuaqiao Station included inthe Lot 11 of Beijing Subway Line 10（Phase II）, by adopting a method combining numerical simulation and fieldmonitoring,the article makes a study on the settlement caused when the newly-built shield tunnel underpasses aburied culvert. By simulating the settlement caused by the bottom of the buried culvert to the corresponding groundwhen the shield is in the tunneling process and when it completely goes through,the largest settlement-affected ar-eas are obtained accordingly. The maximal settlement for the bottom of the buried culvert is 11.6 mm,with that forearth＇s surface of 5.3 mm. By comparing the results of field monitoring and numerical calculation,it comes that theresults are very close,which indicates the rationality of the numerical model. Besides,the maximum value for actu-al monitoring is 4.7 mm,which can meet the 5 mm governing criteria. It indicates that the measures taken duringconstruction is effective and rational.