长距离曲线岩石顶管技术用于供水管道建设

Application of Long-distance Curved Pipe Jacking for Crossing Rock Formation in Water Supply Pipeline Construction

长距离供水管道受地形和选线的限制,必要时需穿越地质条件复杂的山体,增加了工程建设的难度和风险。近年来,曲线岩石顶管技术逐渐被用于供水管道的铺设,并获得了部分成功案例和工程经验,但在理论研究和施工工艺等方面仍有不足。结合某市长距离引水工程实例、围岩压力理论研究以及三维有限元数值模拟,按照管道埋深界限划分,提出并验证了适用于岩石地层顶管的围岩压力计算公式。基于现有规范和计算方法,给出了管浆理想接触条件下的岩石顶管摩阻力估算方法。分析了曲线顶进时顶管的轴向应力分布情况,总结出管节偏心度、截面核与顶管最大允许顶力之间的关系。

Limited by terrain and route selection,the long-distance water supply pipeline may cross a mountain with complicated geological conditions if necessary,which increases the difficulty and risk of project construction.In recent years,the curved pipe jacking for crossing rock formation has been gradually used for laying water supply pipes,and have some successful cases and engineering experience,however,it still has deficiencies in theoretical research and construction technology.Combining the example of a long distance water diversion project in a city,the theoretical study of surrounding rock pressure and the three-dimensional finite element numerical simulation,the calculation formula of surrounding rock pressure adaptable for rock pipe jacking is proposed and verified according to the pipeline depth limit division.Based on the existing specifications and calculation methods,a method for estimating the friction resistance of rock pipe jacking under ideal contact conditions of pipe slurry is provided.The axial stress distribution of the pipe during curved pipe jacking is analyzed,and the relationship among the eccentricity of the pipe joint,the core of the section and the maximum allowable jacking force of the pipe is summarized.