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按“新奥法”施工的河北张石高速黑石岭隧道全长7 560 m,为上、下行分离的双洞单行车双车道,属于长大岩石高速公路隧道。隧道施工期围岩松动圈的测试与判定,对于施工支护设计具有重要作用,文中对利用超声波探测技术对隧道进行了松动圈测试与分析,明确了爆破开挖对围岩的影响范围,优化了隧道的开挖支护施工。
According to “New Austrian law ” construction of Hebei Zhangshi high-speed Heishiling tunnel a total length of 7 560 m, for the uplink and downlink double-lane single-lane two-lane, belonging to the long rock highway tunnel. The test and judgment of the loose ring of surrounding rock during the tunnel construction plays an important role in the construction support design. In this paper, the test and analysis of the loose ring of the tunnel by using the ultrasonic sounding technology are carried out. The influence range of blasting and excavation on the surrounding rock is clarified and optimized Tunnel excavation support construction.