浅埋暗挖法改良淤泥地层注浆方案选取的试验研究  

EXPERIMENTAL STUDY OF GROUTING PLANS OF SHALLOW TUNNELING METHOD TO IMPROVE INTENSITY IN MUD GROUND

作　　者：吴延平[1,2] 王军[1] 刘建民 陈光仔 陈春雷 

机构地区：[1]温州大学建筑与土木工程学院,浙江温州325035 [2]温州市城建设计院,浙江温州325035 [3]山东省地震工程研究院,山东济南250021

出　　处：《岩石力学与工程学报》2013年第S2期3575-3583,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：温州市科技计划项目(S20090006;S20100057)

摘　　要：针对温州地区典型软弱土性质,结合温州市附二医地下人行通道工程,利用普通水泥–水玻璃浆液、超细水泥–水玻璃浆液、HSC注浆液3种改良土壤的注浆材料进行一系列室内试验和现场注入试验。室内试验和现场注入试验表明,同掺量超细水泥与普通水泥的加固效果比较,处理后土体强度相当,超细水泥凝胶时间长、易受地下水稀释影响、超细水泥浆价成本为普通水泥的3倍左右,故提出对温州典型淤泥质地层的加固,采用普通水泥–水玻璃双浆液代替超细水泥浆液作为注浆材料。现场注入试验表明,相同注浆时间下,浆液扩散半径和土体抗压强度随注浆压力的增大而增大;相同注浆压力下,浆液扩散半径均随注浆速度的增大而增加,但随着注入速度的增大,增长趋势减缓。经过现场注入试验确定注浆关键参数:浆液扩散半径为1.0~3.0 m,注浆终止压力1.0~1.5 MPa,注浆加固厚度为4~5 m。注浆后,采用分析法和开挖后取样法检查注浆效果,结果表明,注浆效果符合设计施工要求。此注浆方案的成功应用,对富含深厚软黏土的温州地区及长三角地区地下工程的注浆加固具有非常重要的借鉴意义和广泛的应用前景。In allusion to the Wenzhou typical soft soil properties,combined with pedestrian subway channel engineering in Wenzhou No.2 subsidiary hospital,taking advantage of ordinary cement-sodium silicate double liquid,superfine cement-sodium silicate double liquid and specially made sulphoaluminate cement paste three kinds of soil improvement grouting materials,i. e. a series of indoor laboratory tests and field injectivity tests are carried out. The results show that compasion of superfine cement with the same quantity of the general cement, they have the same intensity,the superfine cement gelation time is long and it is vulnerable to be diluted by the ground water. Compared with the general cement,the superfine cement cost is about 3 times higher,so it is suggested that general cement instead of the superfine cement grouting materials to reinforce silty horizon. The in-situ experiment shows that the grout diffusion radius and compressive strength increases with the increase of grouting pressure under the same grouting time;grout diffusion radius increases with the increase of grouting speed under the same grouting pressure,but the growth trend slows down with the increase of injection rate,. Moreover,the key parameters of grouting have been ascertained and confirmed in practice,the grout diffusion radius is 1.0-3.0 m,the terminate pressure in grouting is 1.0-1.5 MPa,the reinforced depth of grouting is 4-5 m. After grouting,analysis method and sampling method after excavation are inducted to inspect the grouting effect,the results indicate that the grouting effect is in accord with the design construction requirements. The successful application of the grouting project has very good reference and broad application prospect for underground reinforcement engineering in Wenzhou region and Yangtze river delta with rich deep weak silty soil.

关 键 词：土力学 浅埋暗挖法 注浆材料 软土加固 抗压强度 普通水泥 

分 类 号：TU472[建筑科学—结构工程]