双圆盾构施工引起邻近地下管线附加荷载的分析

利用弹性力学的Mindlin解，对孙统立公式进行修正，推导得到双圆盾构正面附加推力和盾壳摩擦力引起的土体附加应力计算公式。假定土体为Winkler模型，采用随机介质理论，推导得到土体损失引起的竖向土体附加应力计算公式。研究了双圆盾构施工在邻近垂直交叉地下管线上引起的附加荷载大小及分布规律。研究结果表明：双圆盾构盾壳摩擦力引起的地下管线附加荷载较大；正面附加推力引起的附加荷载较小，可忽略；竖向附加荷载主要由土体损失引起，最大值一般出现在中轴线上方，当地下管线与盾构之间距离较小时，附加荷载最大值出现在左右单圆圆心附近的位置。

Analysis of additional load on adjacent underground pipeline induced by double-o-tube shield tunneling

Based on the modification of Sun’s solution,additional load formulas caused by bulkhead additive thrust and force of friction between shield and soil in double-o-tube(DOT) shield tunneling are put forward by elastic Mindlin solution.Assumed soil is Winkler model,additional load in vertical direction caused by soil loss is deduced by using random medium theory.A calculation formula additional load caused by DOT shield tunnel construction vertical crossed adjacent underground pipeline is deduced.The results show that: during the pass of DOT shield machine,additional load caused by the friction force between shield and soil plays a leading role;additional load on adjacent underground pipeline induced by bulkhead additive thrust is very small which can be negligible;additional load in z direction is mainly caused by soil loss,and the maximum value generally appears above the axis;when pipeline buried depth is near tunnel,the maximum additional load in z direction appears near to center of each single round.