软土深基坑放坡结合悬臂式排桩支护设计计算模型探讨  

The discuss of the computational model in design of deep foundation pit sloping combined with cantilever row pile support in the soft soil area

作　　者：陈晓东 CHEN Xiaodong

机构地区：[1]福州市建筑设计院有限责任公司,福建福州350011

出　　处：《福建建设科技》2023年第2期44-47,共4页Fujian Construction Science & Technology

摘　　要：随着城市地下空间的开发,基坑支护中运用锚索、锚杆越来越多地受到限制,对于软土深基坑往往采取排桩+内支撑或双排桩的支护方式,但是前者造价高且土方开挖严重影响工期,后者造价过高,因此在条件允许时可采用放坡结合排桩+坑内加固的悬臂式支护体系,但是其相关工程经验较少且计算模型不够成熟,笔者对其设计计算模型进行优化,提出此类基坑在进行结构分析及稳定性验算时,除了要计算主动土压力,同时还需要计算剩余下滑力等观点,结合实际监测数据进行验证,具有一定的理论和实际意义。With the development of underground space,the anchor is subject to limitations in the foundation pit support.The enclosure pile plus internal support soil or double row pile is often used in soft soil foundation pit,but the former has high cost and earthwork excavation that seriously affects the construction period,and the cost of the latter is too high,therefore,if conditions permit,the cantilever support system of sloping combined with row piles plus reinforcement in the pit can be adopted.However,its relevant engineering experience is rare and the calculation model is non-mature enough,its design calculation model is optimized by author.In addition to calculating the active earth pressure,the the residual sliding force is also necessary to be calculated for those foundation pit be calculated at the structural analysis and stability checking calculation.Combined with the actual monitoring data,this paper has important theoretical and practical significance in the future.

关 键 词：软土 放坡 悬臂 主动土压力 剩余下滑力 

分 类 号：TU473[建筑科学—结构工程]