1.一般顶管施工穿越铁路下水道管径2米,长60米,复土2.8米。由于穿越处铁道线路是曲线,为了避免出轨要求铁路下沉量小于9毫米。地层如图所示,管道中心以上是粘性土,以下是砂砾土。采取的措施如下: ①沿管道四周进行土壤加固。加固后粘性土粘着力为2.5顿/平米,砂砾土能自立不会坍方,抗压强度加固前为0.085公斤/厘 1. The general pipe jacking construction passes through a railway sewer pipe diameter of 2 meters, 60 meters long and 2.8 meters of complex soil. Since the railway line passing through is a curve, in order to avoid derailment, the amount of railway subsidence is less than 9 mm. As shown in the figure, the cohesive soil is above the center of the pipe, and the following is gravel soil. The measures taken are as follows: 1 Soil reinforcement along the perimeter of the pipeline. After the reinforcement, the cohesive soil has a viscosity of 2.5tons/sq.m., and the gravel soil can stand on its own without collapse. The compressive strength before reinforcement is 0.085 kg/sq.