青岛胶州湾海底隧道涌水断层注浆效果综合检验方法研究

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Abstract Grouting pressure-grouting flow-grouting time(P-Q-t) control method in grouting entire process，geophysical method，check drilling method and digital camera method from macro to micro had been applied in testing in grouting effect of water filling fault F4–4 in Qingdao Kiaochow Bay subsea tunnel. P-Q-t control method in grouting entire process in which the entire process of grouting P-Q-t control act，grouting pressure in order to limit within 3–4 MPa，when the speed is less than 5 L/min grouting over 20 min，the grouting was ended；the TSP is used to check the surrounding rock after grouting. The results indicate that the integrity of surrounding rock has improved；and its deformation modulus has improved 19.1%；and its density has improved 3.6%；and its Poisson?s ratio has reduced 7.1%；and the VP has improved 0.8%；and the ratio of longitudinal wave velocity of transverse wave velocity VP/VS has reduced 7.1%. The drilling inspection holes amount was 5%–10% of grouting holes. When the single-hole out of water was less than 0.15 L/min，it reached grouting requirements，then it meets the excavation allowed out of water standard. The digital camera method generated three- dimensional virtual cores，then calculated the fracture gap filling paste filling pulse width and the occurrence. It is indicated that the water-filled fissure filling compact. All of above four kinds of test methods determined that the surrounding rock level of water filling fault after grouting has improved from grade V to grade IV. The results show that the grouting effect is good；and it achieved the purpose of reinforcement of the grouting sealing. The comprehensive check method is an effective method of grouting. The above method has some referential and guidance significance to similar projects.

Key words： tunnelling engineering Qingdao Kiaochow Bay subsea tunnel water filling fault grouting effect comprehensive test method

Received: 08 March 2010

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/I7/1382

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