土钉与复合土钉支护的基底承载力问题讨论  

Bottom Bearing Capacity of Construction Pit Retained by Soil Nail and Composite Soil Nail

作　　者：张钧[1] 

机构地区：[1]河南交通职业技术学院,郑州450000

出　　处：《河南科学》2008年第9期1094-1096,共3页Henan Science

基　　金：河南省自然科学基金(0611010300)

摘　　要：土钉支护结构中基底承载力验算是土钉支护结构设计计算的重要步骤,工程实践中存在基底承载力不足,进行土钉设计施工的例子,降低了工程的安全度,严重时会造成基坑坍塌或其他工程事故.复合土钉不仅可以解决土钉支护结构内部稳定性的问题,还可起到加固被动区、增加基底承载力的作用,因此得到广泛应用.通过复合土钉基底承载力验算模型的建立,提出了复合土钉基底承载力验算的设计方法;结合郑州东区工程实例分析了基底承载力不足产生的裂缝、变形等问题,得出实例工程土钉支护产生的地面裂缝是支护结构水平位移与基底承载力不足二者共同作用的结果.Bottom bearing capacity checking of construction pit is a vital item in pit retaining structure design. If the bottom bearing capacity is not sufficient, the reliability of the retaining structure will be unsafe and even results in the collapse of retaining structure. On the other hand, the internal stability will be solved when the composite soil nail is employed. For the more, the passive soil zone will be reinforced and the bottom bearing capacity will be strengthened. Then, the bottom bearing capacity checking model is proposed for composite soil nailing retaining structure. Based on a case study carried out in Zhengzhou, central China, the cracking reasons and deformation pattern for composite soil nail retaining structure are discussed. It is suggested that the main reasons of surface cracking are the insufficient of bottom bearing capacity and horizontal displacement of retaining structure.

关 键 词：土钉 复合土钉 基底 承载力 地面裂缝 

分 类 号：TU472[建筑科学—结构工程] TU201[建筑科学—土工工程]