岩土工程学报2012，Vol.34Issue(7)：1184-1191,8.
持力层对大直径扩底灌注桩竖向承载性状的影响
Influences of bearing stratum on vertical bearing behaviors of large diameter cast-in-place belled piles
摘要
Abstract
The main vertical deformation of large diameter cast-in-place belled piles is the compressive one of end-bearing stratum. So the properties of the end-beating stratum have a great effect on the vertical bearing behavior of the large diameter belled piles. In order to analyze the effectiveness of the bearing stratum on the vertical bearing behavior of a belied pile, three-dimensional non-linear finite-difference numerical models are established by means of the finite-difference program. It is found that the vertical bearing capacity of a large diameter belled pile increases with the increment of the thickness of the bearing stratum. Both the bearing capacity and the tip resistance are notably affected when the thickness variation of the bearing stratum is on the stnall side. When the ratio of the modulus between the shaft stratum and the bearing stratum is 0.2, the ultimate bearing capacity of the large diameter belled pile is greatly affected as the variation of the tip embedded depth of the pile when the thickness of the bearing stratum is on the small side. With the same thickness of the beating stratum, the bearing capacity of the large diameter belled pile is greatly affected as the variation of the modulus of the shaft stratum. The greater the modulus of the bearing stratum is, the greater the bearing capacity is. The bearing capacity of the large diameter belled pile is greatly affected with the variation of the modulus of the bearing substratum.关键词
大直径扩底灌注桩/竖向承载性状/持力层/三维有限差分模型/验证Key words
large diameter cast-in-place belled pile/vertical bearing behavior/bearing stratum/3D finite-difference model/validation分类
建筑与水利引用本文复制引用
高广运,杨成斌,高盟,张婧..持力层对大直径扩底灌注桩竖向承载性状的影响[J].岩土工程学报,2012,34(7):1184-1191,8.基金项目
上海市重点学科建设项目 （）
上海市规土局资助项目 （）
