炭质黏土地质条件下深基坑支护施工技术

Construction Technology of Deep Foundation Excavation Supporting Under Carbonaceous Clay Geological Conditions

保山市某基坑支护工程,地质条件复杂,是典型的炭质黏土,且场地条件有限。通过对工程特点和难点进行分析,提出了基坑整体支护方案,采用自然放坡+土钉+单排长螺旋灌注桩+锚索的组合式支护技术。监测结果表明,该支护方案支护稳定性较好、降水效果明显,在整个基坑支护和地下室工程施工中,边坡没有发生失稳,确保了施工顺利进行。

The geological condition of a foundation excavation supporting project in Baoshan City is complex, and it is a typical carbonaceous clay with limited site conditions. Based on the analysis of the engineering characteristics and difficulties, the integrated support scheme of foundation excavation is proposed, which adopts the combined support technology of natural slope sloping + soil nailing + single row long spiral cast-in-place pile + anchor cable. The monitoring results show that the support scheme has good stability and obvious dewatering effect. In the whole foundation excavation support and basement construction, the slope did not lose stability, which ensured the smooth construction.