豆砾石回填灌浆层缺陷的工程影响研究  

Study on Engineering Influence of Defects in Pea Gravel Backfilling and Grouting Layer

作　　者：张金良 黄秋香[2] 汪雪英 胡超 张少轩 ZHANG Jinliang;HUANG Qiuxiang;WANG Xueying;HU Chao;ZHANG Shaoxuan(Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003;State Key Laboratory of Geological Disaster Prevention and Geological Environment Protection,Chengdu University of Technology,Chengdu 610059)

机构地区：[1]黄河勘测规划设计研究院有限公司,郑州450003 [2]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059

出　　处：《现代隧道技术》2021年第6期163-172,共10页Modern Tunnelling Technology

摘　　要：豆砾石回填灌浆层是护盾式TBM施工隧洞衬砌体系的重要组成部分,研究豆砾石回填灌浆层中不同类型的施工缺陷对工程带来的影响具有理论价值和工程应用价值。文章以一双护盾TBM施工的引水隧洞为工程依托,归纳总结了豆砾石回填灌浆层中常见的缺陷类型及其分布规律;针对不同缺陷类型在不同工程条件下对管片应力及位移产生的影响,进行了系统的模拟分析。结果表明:常见的缺陷类型主要包括空洞、灌浆不密实、纯水泥以及灌浆体岩粉含量过高;空洞缺陷的影响最大,过程中应尽量做到满填满灌;管片竖向位移对施工缺陷比较敏感,有压隧洞中受内水压力作用,管片水平向和竖向位移差异减小;Ⅱ类围岩条件下各种缺陷的影响均较小,除空洞缺陷需要尽量避免外,其余缺陷的影响可忽略;Ⅳ类围岩对管片位移及受力起控制作用,同时会放大缺陷的影响效应,需要采取应对措施;内水压力与地质条件综合作用进一步放大了施工缺陷的影响,Ⅳ类围岩下管片的位移约为相应的Ⅱ类围岩条件下量值的2~3倍,其中空洞缺陷的影响效应尤为凸显。The pea gravel backfilling and grouting layer is an important part of the shield TBM tunnel lining system,and it is of great theoretical and practical significance in studying the impact of different defects in the pea gravel backfilling and grouting layer on construction works.In this paper,common defect types and its distribution law in the pea gravel backfilling and grouting layer are summarized on the basis of a diversion tunnel constructed by the double shield TBM.Then,the effects of different defect types on segment stress and displacement under different engineering conditions are systematically simulated and analyzed.The results show that common defect types mainly include cavity,non-dense grouting,plain cement and high rock powder content in cemented grouts;among others,cavity has the greatest impact,and the fully filling should be performed as much as possible;the vertical displacement of segments is sensitive to construction defects,the difference between horizontal and vertical displacements of segments might decrease under the action of internal water pressure in the pressurized tunnel;under the condition of ClassⅡsurrounding rock,the influence of various defects is small,while that of other defects might be ignored except that cavity should be avoided as far as possible;in the ClassⅣsurrounding rock the displacement and stress of segments are governed by the geological conditions,which would amplify the effect of defects,so that countermeasures should be taken accordingly;interaction of the internal water pressure and geological conditions would further amplify the influence of construction defects,the displacement of segments in ClassⅣsurrounding rock is about 2~3 times of that in the ClassⅡsurrounding rock,with especially prominent influence effect of cavity defect.

关 键 词：护盾式TBM 豆砾石回填灌浆层 管片衬砌 施工缺陷 水工隧洞 空洞 灌浆不密实 

分 类 号：TU991.05[建筑科学—市政工程]