软岩蠕变作用下顶管顶力计算方法研究  

Research on the calculation method of pipe jacking force under soft rock creep effect

作　　者：钟祖良[1,2] 米朝阳 范一飞 李超[1,3] 刘新荣 ZHONG Zuliang;MI Chaoyang;FAN Yifei;LI Chao;LIU Xinrong(School of Civil Engineering,Chongqing University,Chongqing 400045,China;National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR area,Chongqing University,Chongqing 400045,China;College of Civil Engineering,Guizhou University,Guiyang,Guizhou 550025,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学库区环境地质灾害防治国家地方联合工程研究中心,重庆400045 [3]贵州大学土木工程学院,贵州贵阳550025

出　　处：《岩石力学与工程学报》2025年第2期292-302,共11页Chinese Journal of Rock Mechanics and Engineering

基　　金：重庆市技术创新与应用示范专项社会民生类重点研发项目(cstc2018jscx–mszdX0071);国家自然科学基金资助项目(52208391)~~。

摘　　要：针对现有顶力计算模型大多适用于软土及部分硬岩地层,因其无法考虑软岩的蠕变作用、对长距离岩石顶管工程涉及的软岩段适用性差、计算误差大等问题,依托国内首个采用长距离岩石顶管法施工的重庆观景口水利枢纽工程,采用现场调研和现场管节破除等方法探明深埋软岩隧洞顶进施工卡管原因主要由软岩蠕变作用导致管岩间接触压力增大,进而导致管节摩阻力剧增。在碳质页岩室内蠕变试验的基础上,引入Burgers本构模型,按照对应性原理对相关参数进行拉普拉斯变化得到黏弹性位移解,再根据管–岩共同变形原理获得随时间变化的软岩接触压力理论计算模型;通过管–岩摩擦相似试验,并结合简化的三角形突触模型,拟合出考虑法向力的摩擦因数半经验公式,得到顶管隧道软岩下考虑蠕变效应的顶力计算模型。将顶力模型计算数据与实测数据对比,印证理论计算模型在软岩地层中对于顶力预测的合理性。Aiming at the problems that most of the existing jacking force calculation models are applicable to soft soil and some hard rock strata,which cannot consider the creep effect of soft rock,poor applicability to the soft rock section involved in long-distance rock pipe jacking project,and large calculation errors,etc.Then relying on the Chongqing Guanjingkou Water Conservancy Hub Project,which is the first one that adopts the long-distance rock pipe jacking method for construction,we have developed the following model to solve the problems of soft rock and hard rock,which is the first one in China that adopts long-distance rock pipe jacking method,this paper adopts on-site research and on-site pipe breaking and other methods to explore the deeply buried soft-rock tunnel jacking construction stuck pipe mainly by the soft-rock creep effect leads to the increase in contact pressure between the pipe and rock,which leads to a sharp increase in the resistance of the pipe joints.In this paper,on the basis of indoor creep test of carbonaceous shale,Burgers intrinsic model is introduced,and the viscoelastic displacementsolution is obtained by Laplace variation of relevant parameters according to the correspondence principle,and thena theoretical calculation model of time-dependent soft rock contact pressure is obtained according to the principle ofcommon deformation of pipe-rock. Through the tube-rock friction similarity test and combined with the simplifiedtriangular synapse model,the semi-empirical formula of friction coefficient is fitted,and the roof force calculationmodel considering the creep effect under the soft rock of roof tunnel is obtained. Comparison of the calculated datawith the measured data confirms the reasonableness of the theoretical model in predicting the headwall force in softrock strata.

关 键 词：岩石力学 顶管 顶力 接触摩擦试验 软岩 蠕变 

分 类 号：TU45[建筑科学—岩土工程]