深厚软土地区深大基坑风险评价和应对措施

Risk assessment and countermeasures of deep foundation pit in deep soft soil

岳峰镇北站为地下2层岛式车站,车站埋深为16. 85 m。车站基坑地层主要为填土、淤泥和粉质粘土,施工过程自稳性较差。岳峰镇北站周边环境复杂,邻近多个既有地上建筑,且场地内沿道路各种管线密布。根据岳峰镇北站地质条件和邻近既有建筑的具体情况,对基坑进行风险评价,并提出了具体的应对措施,将岳峰镇北站基坑工程自身风险和环境影响风险由Ⅱ级降为Ⅲ级,为基坑安全以及施工过程邻近既有建筑的安全提供了技术保障。

Station of Yuefengbei is an island-platform station with a depth of 16.85 m.The stratum is mainly consisted of filling soil,sludge and silty clay which has poor self-stability during the construction process of the foundation pit.Construction environment of Yuefengbei Station are complex,and the pit is next to structures and pipelines.According to conditions of the pit geological conditions and the adjacent structures,risk assessment and countermeasures of the deep foundation pit are conducted,and level of the risk of pit and the environmental risk is reduced from Ⅱ to Ⅲ,which provides technological support for the safety of pit and adjacent structures.