注浆对邻近土体水平变形影响的原位试验研究  

In Situ Test Study of Influence of Grouting on Horizontal Deformation of Adjacent Soil

作　　者：郑刚[1,2] 王若展 程雪松[1,2] 潘军 杜一鸣 白如冰[2] 王凡俊 Zheng Gang;Wang Ruozhan;Cheng Xuesong;Pan Jun;Du Yiming;Bai Rubing;Wang Fanjun(Key Laboratory of Coast Civil Structure Safety of Ministry of Education(Tianjin University),Tianjin 300354,China;School of Civil Engineering,Tianjin University,Tianjin 300354,China)

机构地区：[1]滨海土木工程结构与安全教育部重点实验室(天津大学),天津300354 [2]天津大学建筑工程学院,天津300354

出　　处：《天津大学学报（自然科学与工程技术版）》2019年第9期959-968,共10页Journal of Tianjin University：Science and Technology

基　　金：国家重点研収计划资助项目(2016YFC0802008);天津市自然科学基金资助项目(18JCQNJC07900)~~

摘　　要：城市环境中,隧道常因邻近基坑等施工活动产生水平变形,然而注浆在建筑物的竖向位移控制方面的研究较多,而在水平变形控制方面研究较少.依托天津地区某工程,通过袖阀管注浆原位试验研究了注浆过程中邻近土体的水平变形模式,并进一步研究了注浆量、注浆距离、注浆顺序、注浆深度范围、注浆时间间隔及注浆速率对邻近土体水平位移的影响.试验结果表明,注浆引发邻近土体的水平变形沿深度方向上的分布模式类似于弓形,最大水平位移位置在深度上位于注浆范围上边界附近,并且随注浆距离的增大逐渐上移.因此,注浆设计时宜根据注浆距离将注浆深度范围的上边界设置在纠偏对象所在深度或以下,以提高位移控制效果.随着注浆量的增大,土体最大水平位移及注浆效率逐渐增大;注浆距离增大,土体最大水平位移及注浆效率逐渐减小,所以为保证注浆效果,注浆距离不宜太大.双孔间隔注浆引起的土体位移比双孔同时注浆略大,其原因是双孔间隔注浆时,先行注浆处硬化后的土体限制后续注浆浆液的扩散.随着注浆速率的提高,注浆结束时土体水平位移大幅提高,但注浆速率较高时,变形稳定后位移无明显增大,即注浆效率降低,为避免对纠偏对象扰动过大,应控制注浆速率.In urban environment,horizontal deformation of tunnels frequently occurs due to adjacent constructions such as excavations. However,many studies have been conducted on the influence of grouting on vertical displacement of buildings,while studies on the influence of grouting on horizontal deformation are limited. Based on a project in Tianjin,the horizontal deformation mode of the adjacent soil during a grouting process was studied through in situ grouting tests,and the influences of the grouting amount,grouting distance,grouting sequence,grouting depth range,grouting time interval and grouting rate on the overall grouting effect were investigated. The test results showed that the deformation mode of horizontal displacement of the adjacent soil along the depth direction resembled the shape of a bow. Moreover,the maximum horizontal displacement was near the upper boundary of the grouted zone,and it gradually moved upward as the grouting distance increased. Therefore,to improve displacement control effect,the upper boundary of the grouting depth range should be set near or below the object to be corrected according to the grouting distance. As the grouting volume increased,the maximum horizontal displacement and the grout-ing efficiency of the soil increased gradually;however,they began to decrease with increasing grouting distance. Hence,in order to ensure the effect of grouting,the grouting distance should not be too large. The soil displacement caused by double-hole sequential grouting was slightly larger than that induced by double-hole simultaneous grouting. The reason is that hardening soils after the first grouting limited the diffusion of the grout injected by the second grouting hole when double-hole simultaneous grouting was conducted. Moreover,with increasing grouting rate,the horizontal displacement of the soil increased and was thus significantly large at the end of the grouting process. However,the final horizontal displacement of the soil increased negligibly,which indicated the grouting efficiency ha

关 键 词：袖阀管注浆 隧道变形控制 土体变形 原位试验 

分 类 号：TU443[建筑科学—岩土工程]