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正洞超前导洞法
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正洞超前导洞法
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正洞超前导坑法
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inner advance heading method
正洞超前导洞法
在隧道施工之前的正洞截面上的某个部位先行开挖一个断面较小的导洞以探明正洞前方地质情况,最后将导洞扩挖为隧道正洞的方法。
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