滨州市黄河冲积区粉细砂层基坑支护选型分析

Deep Excavation Supporting Method Selections of Silty Fine Sandy Layers in Yellow River Alluvial Plains in Binzhou

基坑位于滨州市区,为黄河冲积地层场地,主要支护地层为含水丰富的粉细砂层,场地多侧紧邻周边建筑物。支护方案重点比较了"SMW工法结合锚索、土钉"和"注浆钢花管复合土钉墙为主、局部SMW工法"两种型式,在确保安全的前提下,从适用性、施工难易、经济性及可替代方法等方面进行了分析论述,设计思路和工程经验可为类似工程提供一些借鉴。

This paper presents a case history of deep excavation support in Binzhou City,which is located in the Yellow River Alluvial Plain.The subsurface soil consists of saturated silty fine sand soil strata and the site is surrounded by the building structures.In the selection of deep excavation supporting method,this paper compares the advantages and disadvantages of Soil Mixing Wall(SMW)construction method combined with ground anchors and soil nails and the grouted soil nails with some local SMW method.The objective of the selection is to ensure the safety first.This paper also discusses the applicability,complexity,cost and redundancy during the construction.