砂卵石土层中钻孔桩成孔工艺研究

根据某工程地质情况及地下空洞探测结果，通过对成孔工艺的比选，决定旋挖钻机法为围护桩的主要施工方案，对砂卵石土层中钻孔桩成孔工艺进行了研究，实践证明使用旋挖钻机作业对施工进度及环境均有明显改善，值得推广应用。

Bored pile hole-marking technology research in sandy pebble soil

According to one project's geological condition and underground cavity detection results,and based on the comparison and selection of hole-marking technology,the author decides that the rotary drilling rig method is the main construction scheme of retaining pile,studies the bored pile hole-marking technology in sandy pebble soil,practice shows that using rotary drilling rig work has significant improvement on both construction progress and environment,and is worth popularizing and application.