长距离岩石顶管泥浆配比优化及减摩效果分析  

Optimization of Mud Ratio and Friction Reduction Effect of Long-distance Rock Pipe Jacking Analysis

作　　者：王旭 李超 刘宇 赵千军 WANG Xu;LI Chao;LIU Yu;ZHAO Qian-jun(College of Civil Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学土木工程学院,贵阳550025

出　　处：《科学技术与工程》2025年第3期1235-1244,共10页Science Technology and Engineering

基　　金：国家自然科学基金青年科学基金(52208391);贵州大学博士人才基金(2021-78)。

摘　　要：在超长距离岩石微盾构顶管中,管壁摩阻是决定顶推力大小和中间顶升站布置的关键因素,而选择好的膨润土泥浆是控制管壁摩阻的关键因素。为能充分发挥聚合物膨润土泥浆在顶管施工过程中润滑和支撑的作用,以重庆观景口水利枢纽工程为依托,通过正交试验和室内直剪试验方法对不同类型的膨润土泥浆的基础配比优化,根据浆液性能参数,以及减摩机理得出最优类型泥浆及其配比。结果表明:钠基膨润土泥浆为最优泥浆类型,其配比为膨润土与水的质量比为14%,瓜儿胶0.20%,纯碱0.40%,钠羧甲基纤维素(carboxymethyl cellulose,CMC)为0.40%,聚丙烯酰胺(polyacrylamide,PAM)为0.10%,其减摩效果明显,能够使混凝土与灰岩之间的摩擦系数降低35%,使得岩石顶管顶进过程中,管岩间的摩阻力大大降低。In ultra-long-distance rock micro-shield pipe jacking,pipe wall friction is a key factor in determining the size of the jacking force and the arrangement of the intermediate jacking station,and the selection of a good bentonite mud is a key factor in con-trolling the pipe wall friction.In order to give full play to the polymer bentonite mud in the pipe jacking construction process of lubrica-tion and support,the Chongqing Guanjingkou water conservancy hub project was used as the basis,through orthogonal tests and indoor straight shear test method on the basis of different types of bentonite mud ratio optimization,based on the performance parameters of the slurry,as well as the friction reduction mechanism to derive the optimal type of mud and its ratio.The results show these as follow.So-dium bentonite mud is the optimal type of mud,the ratio of bentonite to water is 14%,guar gum is 0.20%,soda ash is 0.40%,CMC(carboxymethyl cellulose)is 0.40%,PAM(polyacrylamide)is 0.10%,and its friction reduction effect is obvious,it can make the friction coefficient between concrete and gray rock reduced by 35%,which makes the friction between the pipe and the rock greatly re-duced in the process of pipe jacking in the rock.

关 键 词：聚合物 膨润土泥浆 直剪试验 摩擦系数 

分 类 号：U454[建筑科学—桥梁与隧道工程]