三角形布桩下桩承式加筋路堤荷载传递效率研究  

Pile efficacy of geosynthetic-reinforced pile-supported embankments with piles arranged in triangle

作　　者：宫跃航 李明宝[1] 郑俊杰[2] GONG Yue-hang;LI Ming-bao;ZHENG Jun-jie(School of Civil Engineering,Northeast Forestry University,Harbin,Heilongjiang 150040,China;School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China)

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040 [2]华中科技大学土木与水力工程学院,湖北武汉430074

出　　处：《岩土力学》2021年第11期3051-3058,共8页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51878313);哈尔滨市优秀学科带头人基金(No.2013RFXXJ033)。

摘　　要：在同心圆土拱模型的基础上,引入等效桩帽的概念,对正三角形布桩下的桩承式加筋路堤的荷载传递效率进行研究。假设土拱是由三桩之间形成的同心半球土拱以及相邻桩间形成的同心半圆土拱组成,并考虑3D同心球土拱与2D同心圆土拱的荷载传递,以此对土拱效应进行分析。在上覆填土作用下,加筋体的弯沉假设呈抛物线状,并将每个桩帽分成6个拉膜区域,以此分析加筋体所传递的荷载。最后将土拱效应和拉膜效应共同考虑,引入待定系数α满足整体竖向应力平衡,推导三角形布桩下的桩承式加筋路堤荷载传递效率计算方法,并与已有文献数据对比分析验证所提出方法的有效性。研究结果表明:所提出方法的计算结果与实际工程数据相接近,可为工程实践提供理论参考。The load transfer efficiency of geosynthetic reinforced pile-supported embankment with piles arranged in triangle has been studied based on the concentric circular soil arching model with introduced concept of the equivalent pile cap. First, it is assumed that the soil arching is composed of concentric hemispherical soil arching formed by three piles and concentric semicircular soil arching formed between adjacent piles. The load transfer of 3D concentric spherical soil arching and 2D concentric circular soil arching is considered, based on which the soil arching effect has been analyzed. Then the tensioned membrane area of each pile was divided into six parts, and the load transfer of the reinforced material caused by the overlying fill was calculated according to the hypothetical parabolic settlement of the reinforced material. Finally, the computing method of load transfer efficiency of geosynthetic reinforced pile-supported embankment with triangular pile pattern is deduced by jointly analyzing the soil arching effect and tensioned membrane effect, along with introducing the coefficient α to ensure the overall vertical stress balance. The validity of the proposed method was verified through a comparative analysis of the existing literature data. It is shown that the calculation results of the proposed method are close to the actual engineering data, which can provide a theoretical reference for engineering practice.

关 键 词：三角形布桩 同心圆土拱 等效桩帽 荷载传递效率 

分 类 号：TU473[建筑科学—结构工程]