矩形顶管管-土接触面状态及顶推力预估

天津地区采用较大直径的矩形顶管施工地铁车站出入口可借鉴的工程经验较为匮乏.考虑施工停顿、管体悬浮和减阻剂体积等因素的影响，提出了耦合有限差分法和顶力-顶程控制方法的顶推力计算模型，并应用于矩形顶管顶推力的预估.针对天津地层情况，采用该模型预估地铁车站出入口顶管施工中的顶力.现场试验与监测数据证明顶力预估模型的正确性，有助于顶管工作井后背墙的设计优化及长距离大直径顶管施工中继间的布置.

Pipe-Soil Contact State and Jacking Force Prediction of Rectangular Pipe Jacking

The experience of rectangular pipe jacking for exit and entrance of metro station in Tianjin is limited， especially for pipes with large diameter. Considering the factors such as stoppages， pipe buoyancy and lubrication volumes， a jacking force calculation model of the coupled finite difference method and jacking force-jacking path control method was proposed and applied to the estimation of jacking force of rectangular pipe jacking. In view of the stratum situation in Tianjin， this model was used to estimate the jacking force in the construction of pipe jacking at the entrance and exit of metro stations. The field test and monitoring data proved the correctness of the jacking force prediction model. It is helpful for the design optimization of the back wall of the jacking working well and the layout of the long-distance large-diameter jacking construction relay room.