基于极限拉应变法的盾构掘进注浆隆起对上覆结构的影响  

Influences of grouting heave on overlying structures in shield tunneling

作　　者：林存刚[1] 张忠苗[1] 吴世明 崔迎辉[3] 

机构地区：[1]浙江大学,岩土工程研究所,软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]杭州庆春路过江隧道有限公司,浙江杭州310002 [3]中国石油独山子石化公司营销调运处,新疆独山子833600

出　　处：《浙江大学学报（工学版）》2012年第12期2215-2223,共9页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51078330);杭州庆春路过江隧道科研资助项目

摘　　要：通过对杭州庆春路过江隧道盾构掘进地面位移的分析,发现横断面地面注浆隆起符合高斯分布;在Peck公式基础上考虑注浆隆起,提出广义Peck公式,可对盾构隧道施工引起的包含注浆隆起在内的横断面地面位移进行合理的预测与反分析.基于极限拉应变法,讨论了地层损失沉降和注浆隆起综合作用对上覆结构的影响.通过一算例分析,对盾构掘进最佳同步注浆量进行了探寻.算例表明:提高注浆建筑空隙填充率对减轻盾构掘进给结构造成的危害是最为关键的,额外注浆反而对结构不利.Through analysis of in-situ monitored ground surface movements due to shield tunnelling in construction of Hangzhou Qingchun Road Cross-river Tunnel, it was found that the transversal ground surface heave induced by tail grouting follows the Gaussian curve pattern. Based on the traditional Peck equation, a generalized Peck equation that takes the grouting heave into account was proposed, which can predict and back-analyze the shield tunnelling-induced ground surface movements including grouting heave inside with great accuracy. Based on the limiting tensile strain method, the combined influences of ground loss and tail grouting on overlying structures were studied. In the case study, the optimum grouting volume was explored. The case study showed that the key to minimize tunnelling^s damage to overlying structures is to increase the factor of grouting , while additional grouting is harmful to the structures safety.

关 键 词：同步注浆 盾构掘进 极限拉应变法 结构响应 注浆隆起 

分 类 号：TU443[建筑科学—岩土工程]