基坑疏排桩-土钉组合支护结构工作性状研究  

Working Performance of Composite Supporting Structure of Scattered Row Piles in Soil Nailing Wall Pit-protection

作　　者：王小洁[1] 王贵和[1] 沈元红[1] 

机构地区：[1]北京市地质工程公司,北京100143

出　　处：《城市地质》2014年第A01期151-154,160,共5页Urban Geology

摘　　要：基坑工程在深度和面积上有越来越深和大的发展趋势,在东南沿海地区,由于土质条件欠佳,地层上部一般多为疏松的杂填土和淤泥质土,下部为深厚的淤泥质粘土,因此基坑支护面临着更大的挑战(吴忠诚,2011)。目前,基坑支护应用比较广泛的有桩锚支护和土钉支护,并且理论上有了比较完善和成熟的方法。桩锚支护可以充分利用桩抗弯的优势,能够很好的控制土的位移和变形,但是其造价比较高,而且施工工艺比较复杂。土钉支护具有造价低、施工方便的优点,在工程实践中有了大量的应用,并且理论上比较成熟。将疏排桩和土钉联合起来使用,能够充分利用疏排桩抗弯,土钉抗剪的优点,并且可以减少造价。疏排桩-土钉组合支护在工程实践上已经有了成功的案例,但是目前尚未广泛使用。由于组合结构内力规律、变形特征等还没有完善和统一的分析和设计方法,因此需要更深入的研究。本文主要分析了疏排桩-土钉组合支护结构的土压力分配规律,总结了前人所采用的计算方法,与工程实测结果进行对比,分析理论计算方法的合理性。It is becoming deeper and larger for foundation pit engineering. In coastal areas, because of poor soil conditions, soils are mostly miscellaneous and muddy soil, and thick-layered clay at the bottom. Therefore, foundation pit engineering is facing greater challenges. At present, pile anchor and soil nailing supporting are widely used in foundation pit engineering, and it is perfect and mature. Combing pile anchor and soil nailing, bending-resistance of pile anchor and shear-resistance of soil nail are fully used, and the cost is reduced. The scattered row piles in soil nailing wall pit-protection have some successful cases in engineering practice, but not widely used, and it requires further research. The paper studied inner force calculation of the composite support,soil arch analysis and design method by theoretical analysis and numerical simulation, based on a project, and proves rationality of the structure.

关 键 词：疏排桩-土钉 土拱效应 变形协调 

分 类 号：TU753[建筑科学—建筑技术科学]