手掘式顶进法进洞施工顶进力计算与后背结构力学特性

顶进法施工中，顶进力的计算尤为重要。对于进洞施工埋深随顶进距离变化（洞口有一定坡度）的情况，尚未有相关理论公式，本文推导了洞口带有坡度情况下的顶进力理论计算公式，并与模拟结果进行对比，结果表明推导的顶进力理论计算公式较为准确，反映了洞口坡度对顶进力的影响。对3种不同的后背结构型式受力变形特征进行了模拟计算，结果显示连续墙+钢筋混凝土墙效果最好，连续墙+钢架次之，摩擦桩+钢架最差，采用连续墙+钢架后背结构时需着重注意钢架与连续墙的连接型式。

Jacking Force and Mechanical Characteristics of Back Structure in Tunneling Construction with Manual Jacking Method

In jacking construction, the calculation of jacking force is particularly important. There is no relevant theoretical formula for the change of buried depth with jacking distance ( there is a certain slope at the entrance ). In this paper, the theoretical calculation formula of jacking force under the condition of slope at the entrance is derived and compared with the simulation results. The results show that the theoretical calculation formula of the jacking force is more accurate, which reflects the influence of slope at the entrance on the jacking force. The stress and deformation characteristics of three different back structure types are simulated and calculated. The results show that the continuous wall + reinforced concrete wall is the best, the continuous wall + steel frame is the second, and the friction pile + steel frame is the worst. When using the continuous wall + steel frame back structure, attention should be paid to the connection type between the steel frame and the continuous wall.