摘要
在软土地区开展桩基工程建设,桩基水平承载力的确定是一个亟待解决的问题。以Matlock软黏土p-y曲线为基础,提出Matlock p-y曲线的双折线简化模型,进而采用不排水抗剪强度指标su和静力触探锥尖阻力qc对双折线简化模型参数k_(ini)、p_u进行表征。以无量纲桩土相对刚度系数K_R作为刚、柔性桩划分标准,并分别建立了初始切线模量系数K_E与K_R、水平土抗力系数K_C与K_R的关系,最后提出了软土地基刚、柔性桩水平承载位移控制标准。结果表明:提出的位移控制标准可以快速确定桩基临界水平承载力,是一种实用、可靠的桩基水平承载判别方法。
The determination of lateral force capacity of piles is a problem to be solved in construction of soft soil area.Based on the Matlock p-y curve used in soft clay,a simplified double broken line model of Matlock p-y curve was proposed,and then the undrained shear strength index su and CPT cone tip resistance qc were used to represent the model parameter k_（ini） and p_u.The dimensionless relative stiffness coefficient of pile and soil,noted as K_R,was used as a classification standard to differentiate rigid pile and flexible pile.The relationships between the initial tangent modulus coefficient denoted K_E and the horizontal soil resistance coefficient denoted K_C were established.At last,the displacement standards for lateral capacity of rigid pile and flexible pile in soft soil foundation were developed.Results show that the displacement control standards can quickly determine the pile critical lateral capacity.it demonstrates a practical and reliable method of evaluating lateral capacity of pile foundation.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2017年第9期2676-2682,2692,共8页
Rock and Soil Mechanics
基金
国家重点研发计划项目(No.2016YFC0800201)
江苏省建设系统科技项目资助(No.2014ZD66)
中央高校基本科研业务费专项资金资助
江苏省普通高校研究生科研创新计划资助项目(No.KYLX16_0244)~~
关键词
软土地基
刚性桩
柔性桩
位移控制标准
水平承载
P-Y曲线
soft soil foundation
rigid pile
flexible pile
displacement standard
lateral capacity
p-y curve
