摘要
冻土与结构接触面的损伤分析是解决冻土与结构相互作用问题的关键。以自研大型多功能冻土直剪仪为试验平台,开展不同冻结温度、法向应力、粗糙度条件下人工冻结粉细砂与钢板接触面大型直剪试验,分析不同工况条件下接触面剪应力−剪切位移关系及其变化规律。从岩土材料内部所含缺陷分布的随机性出发,将连续损伤理论和统计强度理论有机结合,构建冻结粉细砂与钢板接触面剪切统计损伤模型,确定模型参数通解。该模型能较好模拟冻土与结构接触面剪切变形中线弹性、应变硬化、应变软化及残余强度等典型特征,能有效考虑冻结温度、法向应力和粗糙度对接触面剪切强度的影响,可为冻土与结构接触面冻结强度预估和数值模拟研究提供基础模型。
Damage analysis is the key to solve the problem of interaction between frozen soil and structure.To this end,a large-scale multi-function frozen soil shear device was used.Multiple direct shear tests were carried out on the adfreezing strength at the interface between artificial frozen fine sand and steel plate under conditions of different freezing temperature,normal stress,and roughness.The relationship between shear stress and shear displacement was obtained.Based on the comprehensive continuous damage theory and statistical strength theory,a statistical shear damage model was constructed.Meanwhile,the solution of the statistical damage model parameters was determined.This shear model can simulate the typical characteristics of linear elasticity,strain hardening,strain softening and residual strength.At the same time,this shear model can reflect the influence of temperature,normal stress and roughness on shear strength.Therefore,this model can be used as a basic model for adfreezing strength prediction and numerical simulation at the interface between frozen soil and structure.
作者
石泉彬
杨平
SHI Quanbin;YANG Ping(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China;School of Architectural Engineering,Taizhou Polytechnic College,Taizhou 225300,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2021年第10期2591-2599,共9页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51278251)
住建部科学技术项目(2017-K4-017)
江苏省高校青蓝工程资助项目(苏教师函〔2020〕10)。
关键词
剪切统计损伤模型
冻土
接触面
直剪试验
冻结强度
statistical shear damage model
frozen soil
interface
direct shear test
adfreezing strength
