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反井钻机在扩孔施工遇到软弱夹层或者围岩破碎地带时常常会伴随着塌孔突发事故,发生塌孔一般处理方法是向塌方处灌浆,待围岩固结后,继续扩孔,但此种方法由于注浆深度和效果不好控制,导致工期一般比较长。文章介绍某一在建工程在扩孔时距离地表还有10 m左右时发生塌孔,针对此塌孔采用放坡开挖+混凝土回填的方式进行施工,此方法便于施工、处理时间短,且混凝土换填地表软弱岩层后能充分保证竖井成品质量。
Raise drill drilling in the reaming encountered weak intercalation or rock crushing zone often accompanied by collapse of the hole accident occurred collapse tunnel general approach is to cave to the grouting until the consolidation of the surrounding rock to continue reaming, However, this method due to poor control of grouting depth and effectiveness, resulting in a longer duration generally. This paper introduces a tunnel collapse when a project under construction has a distance of about 10 m from the ground surface during reaming, and adopts the method of grading excavation + concrete backfilling for this tunnel collapse. This method is convenient for construction and has short processing time. Concrete fill the surface of soft rock can fully guarantee the quality of shaft products.