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

 采用注浆全过程注浆压力–注浆量–注浆时间(P-Q-t)控制法、物探法、检查孔法与数字钻孔摄像法从宏观到细观对青岛胶州湾海底隧道F4–4涌水断层全断面帷幕注浆后的注浆效果进行检验,其中注浆全过程压力–流量–时间控制法将注浆压力限制在3～4 MPa,当注浆速度小于5 L/min超过20 min时,结束该孔注浆;TSP物探法对注浆前后的含水断层探测结果表明,注浆后围岩整体性得到提高,其变形模量提高19.1%,密度提高3.6%,泊松比下降7.1%,纵波波速VP增长0.8%,纵横波比VP/VS减小7.1%;按注浆孔的5%～10%钻探检查孔,当单孔出水量≤0.15 L/min时,达到注浆要求,满足开挖允许出水量标准;数字钻孔摄像法生成三维虚拟岩芯,计算裂隙充填浆脉的充填隙宽及产状,表明注浆后裂隙充填密实。4种检验方法综合判定含水断层注浆后围岩等级由V级提高到IV级,表明注浆效果良好,达到注浆止水加固的目的,综合检验法是检验注浆效果的有效方法,上述方法对类似工程具有一定的借鉴与指导意义。

STDUY OF COMPREHENSIVE TEST METHOD FOR GROUTING EFFECT OF WATER FILLING FAULT IN QINGDAO KIAOCHOW BAY SUBSEA TUNNEL

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...