深基坑工程险情解析

Risk Analysis in Deep Foundation Pit Engineering

深基坑工程属危险性较大的工程。以北京朝阳区某13m基坑为例,在介绍场地地质及基坑的降水设计、支护设计的基础上,详述了基坑从险情发生、发展到得到有效控制的全过程。分析认为,险情发生的地段,是由于其桩间支护强度过高,桩背侧大量雨水汇聚,而又没有有效的排水通道造成的;本工程对第二道锚杆的提前加固,也对支护结构未出现整体坍塌起到一定作用。从基坑的抢险成功可以发现,边坡的动态监测是至关重要的;出现险情后,各方的统一协调是排除险情的关键;切实可行的措施是解除险情的核心。本案例可为类似工程抢险提供借鉴。

The deep foundation pit engineering implies rather large risks. Taking a 13m deep foundation pit in the Chaoyang District, Beijing as an example, on the basis of introduction to site geology, foundation pit drainage and supporting designs, have expounded the whole process from dangerous case happening, developing and going down to be effectively controlled in detail. The analysis considered that the risk is arose by exorbitant supporting strength between piles, causing large amount rain water pooling together at reverse side of piles and without effective drainage channels. The advanced reinforcing of the second anchor played a certain role to prevent massive collapse. From the successful dealing of emergency we can see, the dynamic monitoring of slopes is vitally important; after the dangerous case appearing, unified coordination of all parties and practicable measures are the key and kernel to remove the dangerous situation. The case can be a reference to all same kind engineering rescues.