排桩支护结构验算及施工工艺改进

针对基坑工程施工周期长、工艺复杂的特点，结合工程实际需求，对支护结构施工中关键工艺的改进方案进行验算。在基坑开挖过程中，横向支撑布置与否对基坑开挖工序及工期影响较大。以东莞市石大公路寮步通道为工程背景，分别对其单排桩支护结构三个标准横断面、四种地质工况进行验算，以支护桩水平位移、支护桩内力及抗倾覆安全系数为计算参数，对比有无横向支撑的计算结果，发现基坑深度大于6m，无横向支撑往往是不可取的；基坑深度低于6m，无横向支撑仍有一定的安全储备。

Pile-row Retaining Structure Calculation and Construction Process Improvement

Because the pit engineering construction is complicated, and construction period is long, this paper made a structure calculation for construction of the key technology improvement scheme according to engineering actual demand. Whether cross binding arranging or not greatly influenced exca- vation process and period for a project. This paper calculated three cross sections four kinds of geological conditions of the pile-row retaining structure based on liaobu channel of Duanguan Shida hingway. Then, it got calculation results including pile-row horizontal displacement, internal force of retaining pile and resistive overturning safety coefficient. Finally, it made a conclusion that foundation pit depth greater than 6 meters, no cross binding is often not advisable ; foundation pit depth below 6 meters without bind- ing is still a Certain safety stock.