均质土中钢顶管顶进稳定性的能量法分析  

Energy method for stability of steel jacking pipes during construction in uniform soil

作　　者：邵光辉[1] 苏毅[1] 赵志峰[1] 

机构地区：[1]南京林业大学土木工程学院,江苏南京210037

出　　处：《岩土工程学报》2016年第8期1490-1496,共7页Chinese Journal of Geotechnical Engineering

基　　金：住房和城乡建设部科学技术项目(2010-K3-10);江苏高校优势学科建设工程项目

摘　　要：顶管作为一种非开挖技术,越来越多地应用于各种地下管线工程。钢顶管在顶进过程中,如果顶力控制不当,可能发生轴向整体屈曲,从而导致管体结构失稳破坏。针对这一问题,考虑管周土体的约束、管–土摩阻力以及轴线偏差引起的初弯曲等作用,建立并求解了均质土中钢顶管在轴向顶力作用下的能量方程,获得了临界顶力荷载的解析解。然后,从轴线偏差、管周土体地基反力系数、管–土摩阻力方面分析了钢顶管轴向整体稳定系数的变化规律。钢顶管轴向整体稳定系数随长细比增大而减小,轴线偏差显著降低了钢顶管的轴向整体稳定性。顶管周围土体的约束作用增大了钢顶管轴向整体稳定性。管土摩阻力对钢顶管的轴向整体稳定性影响很小,可以忽略不计。均质土中的钢顶管轴向稳定性规律不同于一般的钢结构,临界顶力荷载解析解可以为钢顶管设计提供依据。As a trenchless technology,thejacking pipe has been usedin more and more underground pipe lineprojects.The steel jacking pipe mayhaveoverall bucking by improper jacking force during construction. Pipestructure will fail by the instability. To deal with this problem, several effects such as constraint of surrounding soil, fraction between soil and pipe and initial bending of pipe are considered. The analytical solution of critical jacking force is deduced bytheenergy method. The laws for coefficients of stability development are discussedin the aspects of initial bending, coefficient of subgrade reaction of surrounding soil and fraction stress between soil and pipe. The overall stability coefficientsdecrease withthe increasing slenderness for initial bending jacking pipe. Theaxis line deviation significantly reduces the overall stability. On the other hand, the constraint of surrounding soil strengthens the overall stability. The fraction stress between soil and pipehas little influence on the overall stability and can be ignored. The laws fortheoverall stability of steel jacking pipes in uniform soil are very differentfrom those for theordinary steel structural members. The analytical solutionof critical jacking forcecan be used for the design of steel jacking pipes.

关 键 词：钢顶管 轴线偏差 初弯曲 整体稳定 能量法 

分 类 号：TU990.3[建筑科学—市政工程]