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| Influences of grouting heave on overlying structures in shield tunneling |
| LIN Cun-gang1, ZHANG Zhong-miao1, WU Shi-ming2, CUI Ying-hui3 |
1. Institute of Geotechnical Engineering, MOE Key Laboratory of Soft Soils and Geoenvironment Engineering,
Zhejiang University, Hangzhou, 310058, China；2. Hangzhou Qing-chun Road Cross-river Tunnel Company Limited,
Hangzhou,Zhejiang 310002, China； 3. PetroChina Dushanzi Petrochemical Company,Dushanzi 833600, China |
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Abstract 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 backanalyze 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.
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Published: 01 December 2012
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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
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.
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