花岗岩残积土邓肯-张模型参数的合理确定  

Reasonably Determining the Parameters of Duncan- Chang Model for Granite Residual Soil

作　　者：赖榕洲[1] 吴能森[1] 徐青[1] 

机构地区：[1]福建农林大学交通与土木工程学院,福建福州350002

出　　处：《鸡西大学学报（综合版）》2013年第12期71-73,77,共4页JOurnal of Jixi University:comprehensive Edition

基　　金：福建省自然科学基金项目(2007J0357);福建省高等学校科技项目(JA09073);福州大学土木工程国家级实验教学中心第三期创新性实验研究项目(IRP2012-3);福建农林大学创新(培育)团队建设项目(Pytd12006)

摘　　要：为合理确定花岗岩残积土的邓肯-张模型参数，制作3种不同含水率的试样，分别在围压100kPa、200kPa和300kPa条件下进行固结排水三轴试验，得到的应力-应变关系曲线均呈非线性加工硬化型，符合邓肯-张模型的适用条件。然后分别采用“全点法”和“两点法”求取邓肯-张模型参数，并利用求取结果对模型曲线进行拟合，结果表明：“全点法”因不可避免要受到异常数据的干扰，所求取模型参数精度较低，而“两点法”仅使用高应力水平的两组数据，不仅简单、方便，且可以避免低应力阶段异常数据的干扰，所求取模型参数精度较高。建议工程上采用“两点法”确定花岗岩残积土的邓肯-张模型参数。To determine Duncan- Chang model＇s parameters of granite residual soil, three different moisture content samples were made and triaxial consolidation drained tests were done under surrounding pressures of 100 kPa,200 kPa and 300 kPa respec- tively. All stress - strain curves obtained are of the property of work - hardening which coincides with the conditional formula of Duncan - Chang model essentially. Afterwards, parameters of Duncan - Chang model were calculated to curve fit by means of ＂all point method＂ and ＂two point method＂ respectively, and the result is as follow： ＂all point method＂ is poor than ＂two point meth- od＂ in accuracy, because ＂all point method＂ is interfered by abnormal data unavoidably; whereas ＂two point method＂ is not only simple and convenient, but can prevent from being disturbed by abnormal data in low stress level due to only using two sets of data in high stress level, so, It is suggested that ＂two point method＂ should be apply to calculate the Duncan -Chang model＇s parame- ters of granite residual soil in engineering practice.

关 键 词：花岗岩残积土 邓肯-张模型 三轴试验 全点法 两点法 

分 类 号：TU411[建筑科学—岩土工程]