STDUY OF COMPREHENSIVE TEST METHOD FOR GROUTING EFFECT OF WATER FILLING FAULT IN QINGDAO KIAOCHOW BAY SUBSEA TUNNEL
STDUY OF COMPREHENSIVE TEST METHOD FOR GROUTING EFFECT OF WATER FILLING FAULT IN QINGDAO KIAOCHOW BAY SUBSEA TUNNEL
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发表时间：
2011
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通讯作者：
Zhang Gong-shi
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作者：
Zhang Gong-shi
将注浆压力-注浆流量-注浆时间(P-Q-t)控制法应用于青岛胶州湾海底隧道F4-4充水断层注浆效果测试中，采用了地球物理方法、检测钻井法和数码相机从宏观到微观的注浆全过程控制法。P-Q-t控制法在注浆全过程中进行P-Q-t控制，注浆压力要控制在3-4 Mpa以内，当注浆速度小于5 L/min注浆超过20min时，终止注浆；用TSP对注浆后的围岩进行检测，结果表明，围岩的整体性有所改善，变形模数提高19.1%，密度提高3.6%，泊松S比降低7.1%，VP提高0.8个百分点。钻孔检查孔数占注浆孔数的5%~10%，当单孔出水小于0.15时，达到注浆要求，满足允许出水开挖标准。数码相机方法生成三维虚拟岩心，计算了裂隙充填膏体充填脉宽和充水次数，表明充水裂隙充填致密，上述四种测试方法均确定注浆后充水断层的围岩水平由V级提高到IV级。综合验算方法是一种有效的灌浆方法，对类似工程具有一定的借鉴和指导意义。
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.