摘要
北京市门头沟某土建工程项目基坑深度达13.9 m,且基坑周围存在既有道路,施工风险很高。综合考虑基坑的深度、土质、水位等参数,经过分析,最终采用钢筋混凝土防护桩结合锚索的支护方案,确定了详细的支护结构参数。使用理正深基坑软件对支护结构进行了模拟计算,计算结果表明:深基坑主体支护结构的抗弯强度、水平位移、整体稳定性和地面沉降均满足要求,且计算所得水平位移和地表沉降值与施工监控数值非常接近,表明支护结构的计算能够反映支护结构实际的受力状态。可为相似地质水文条件的基坑支护方案设计和监测提供参考。
The excavation depth of a civil engineering project in Mentougou,Beijing city is up to 13.9 m,and there are existing roads around the excavation,so the construction risk is very high.Considering the depth of foundation pit,soil quality,water level and other parameters,through analysis,the reinforced concrete protective pile combined with anchor cable supporting scheme was finally adopted,the detailed supporting structure parameters were determined.Using Lizheng deep foundation pit software to simulate the supporting structure,the calculation results show that the bending strength,horizontal displacement,overall stability and ground settlement of the main supporting structure of deep foundation pit meet the requirements,and the calculated horizontal displacement and ground settlement values are very close to the construction monitoring values,which shows that the calculation of the supporting structure can reflect the actual stress state of the supporting structure.It can provide a reference for the design and monitoring of foundation pit support scheme under similar geological and hydrological conditions.
作者
鞠秀虹
JU Xiuhong(Beijing Engineering Co.Ltd.of the 18th Bureau Group of China Railway,Beijing 100162,China)
出处
《国防交通工程与技术》
2022年第1期55-58,共4页
Traffic Engineering and Technology for National Defence
关键词
深基坑
桩锚结合
支护设计
监测
deep foundation pit
pile-anchor combined structure
support design
monitoring
