基于界面黏附力盾构堵塞风险评判方法研究  

Risk evaluation method for shield clogging based on interface adhesion force

作　　者：方勇[1] 王宇博 王凯[1] 钱聚强 陈中天 卓彬 FANG Yong;WANG Yubo;WANG Kai;QIAN Juqiang;CHEN Zhongtian;ZHUO Bin(Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;China Railway 14th Bureau Group Tunnel Engineering Co.,Ltd.,Jinan 250101,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [2]中铁十四局集团隧道工程有限公司,山东济南250101

出　　处：《岩土工程学报》2023年第9期1813-1821,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52078428);四川省杰出青年基金项目(2020JDJQ0032)。

摘　　要：为了准确预测盾构在高黏粒地层掘进时刀盘堵塞风险、提供刀盘泥饼防治依据,自行设计土体-金属界面拉拔试验装置与界面直剪试验装置,通过室内试验,分析了不同土样在不同稠度指数下法向黏附力与切向黏附力变化规律;基于试验结果提出了针对黏附力的五等级盾构堵塞风险分区图,并应用于强风化混合花岗岩渣土改良效果评估。研究表明:法向黏附力随稠度指数的增大先升高再降低,蒙脱土含量的提高会降低法向黏附力峰值线的稠度指数;全样品的摩擦角和切向黏附力在稠度指数小于0.6后稳定在低水平;稠度指数大于0.6时,纯黏土土样切向黏附力随着稠度指数的增加而增加,含砂土样切向附着力在稠度指数0.9附近有峰值,随后降低;针对黏附力盾构堵塞风险分区图可反映渣土改良过程中的盾构堵塞风险变化的路径,可对渣土改良效果进行评估。In order to accurately predict the risk of cutterhead clogging and provide the basis for preventing and controlling cutterhead mud cake in the tunneling of high clay stratum,the laboratory tests are conducted by using the self-designed soil-metal interface pull-out test device and the improved direct shear test device.The variation rules of the normal and tangential adhesion forces of different soil samples under different consistency indexes are analyzed through the laboratory tests.Based on the test results,a five-grade shield clogging risk zone map for adhesion force is proposed and used to evaluate the conditioning effects of the strongly weathered mixed granite residue.The results show that the normal adhesion first increases and then decreases with the increase of the consistency index,and the increase of the montmorillonite content decreases the peak line consistency index of the normal adhesion.The friction angle and tangential adhesion of the whole samples remain at a low level when the consistency index is less than 0.6.When the consistency index is greater than 0.6,the tangential adhesion of the pure clay sample increases with the increase of the consistency index,and the tangential adhesion of the sandy soil sample has a peak value near the consistency index of 0.9,and then decreases.The shield clogging risk zone map for adhesion force can reflect the path of the change of shield clogging risk in the process of soil conditioning,and the effects of soil conditioning can be evaluated.

关 键 词：盾构隧道 堵塞风险 室内试验 渣土改良 法向黏附力 切向黏附力 

分 类 号：TU431[建筑科学—岩土工程]