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某住宅楼工程基坑深7.2m,采用锚杆护坡。根据地质勘探资料显示,仅地表1m深为粉质粘土,其余近10m深为粉砂层。由于土质为粉砂,车辆在进行开挖运输过程中容易下陷,砂层易风化,土体不稳定,在开挖过程中容易产生坍塌,与土方运输产生矛盾。在护坡过程中,要进行锚杆掏孔,由于为砂层,孔洞受风化易坍塌。
A residential building deep foundation pit 7.2m, the use of bolt slope protection. According to the geological prospecting data, only the surface 1m deep silty clay, and the remaining nearly 10m deep silt layer. As the soil is silt, vehicles are easy to sag during excavation and transportation, the sand layer is easily weathered and the soil is unstable. It is prone to collapse during excavation and contradicts earthwork transportation. In the process of slope protection, it is necessary to dig the hole of the bolt. Due to the sand layer, the hole is easy to collapse by weathering.