At present, the most popular trenchless pipeline installation method is guided boring, but in the guided boring cave-in of the borehole wall eternally are encountered in quicksand formation.
目前最流行的非开挖铺管技术为导向钻进法，但这种施工法在流砂地层施工时容易发生塌孔。
At present, the most popular trenchless pipeline installation method is guided boring, but in the guided boring cave-in of the borehole wall eternally are encountered in quicksand formation.
目前最流行的非开挖铺管技术为导向钻进法，但这种施工法在流砂地层施工时容易发生塌孔。
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