摘要
在盾构掘进过程中,由于刀盘的挤压作用,土仓压力不等于掘进面土压力。为研究二者的关系,提出基于位移反分析法的盾构掘进面土压力计算方法。建立模拟盾构掘进的ANSYS三维模型,结合盾构前方土体(或构筑物)的实测变形数据,调用ANSYS优化分析模块计算盾构掘进面土压力。该方法的适用区域为:位移监测点位于主要受掘进面土压力挤压作用区域的土体内。以上海地铁7号线上行线隧道斜下穿既有地铁2号线下行线隧道盾构施工工程为例,采用该方法对掘进面土压力进行计算分析。结果表明:该方法在本工程中的适用范围为盾构掘进刀盘距既有隧道中心线6～18m的区域;掘进面土压力约为土仓压力的1.17倍。
In the course of shield excavating,for the effect of the cutterhead extrusion,there was a certain difference between the chamber pressure and the earth pressure on the excavation face of the tunnel. In order to attain the relationship between the chamber pressure and the earth pressure on the excavation face of the tunnel theoretically,the inverse displacement analysis method was introduced,based on which the theoretical analysis method about earth pressure of the tunnel excavation face was proposed. This method calculated the earth pressure of the tunnel excavation face by creating a three-dimensional ANSYS simulation model of the shield excavation,and then called the ANASYS optimization analysis module,based on the measured deformation of the soil （or building structure） in front of the shieldhead. The scope of its application was discussed,it was when the monitoring points of the displacement located in the soil region which was mainly influenced by the extrusion effect of the earth pressure on the tunnel excavation face,the method was available. This method was used to the practical engineering of Shanghai Metro Line 7 skew intersection undercrossing Metro Line 2 to calculate and analyze the earth pressure on the excavation face of the tunnel. The results show that when the distance between the shield cutterhead and the centre of the existing line is 6～18 m,this method is applicable in this project. The earth pressure on the excavation face of tunnel is about 1.17 times of the chamber pressure,that is to say the earth pressure on excavation face of tunnel is greater than the chamber pressure.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2010年第4期53-58,共6页
China Railway Science
基金
上海轨道交通7号线科研课题项目
关键词
盾构隧道
掘进面
土仓压力
土压力
位移反分析
Shield tunnel
Excavation face
Chamber pressure
Earth pressure
Inverse displacement analysis
