反弯点求固结系数的数值方法  

Numerical method for consolidation factor on reserve bend point

作　　者：林丽萍 刘可定[1] 贺建清[2] 姚琪 LIN Liping;LIU Keding;HE Jianqing;YAO Qi(Hunan Urban Construction College,Xiantan 411101,China;Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiantan 411201,China)

机构地区：[1]湖南城建职业技术学院,湖南湘潭411101 [2]湖南科技大学岩土工程稳定控制与健康监测省重点实验室,湖南湘潭411201

出　　处：《铁道科学与工程学报》2020年第3期623-627,共5页Journal of Railway Science and Engineering

基　　金：湖南省自然科学基金资助项目(2019jj40056);湖南省教育厅科学研究重点项目(18A345)。

摘　　要：计算固结系数的方法中,反弯点法使用方便、计算简单,但需要目测寻找反弯点,因而所得结果误差比较大。本文根据太沙基一维固结理论,由固结度与时间因数推导计算半对数坐标中沉降曲线斜率的表达式,通过分析土样的沉降速率与时间得到半对数坐标中沉降曲线的反弯点并计算土样的固结系数。研究结果表明:因为反弯点位于主固结阶段,该方法可以避免初始压缩与次固结的影响,并且只需进行简单的计算,因此可避免图解法中目测确定反弯点带来的人为干扰。Among the different methods of calculating the coefficient of consolidation,the inflection point method is easier to use.But it can cause larger error range because the point of inflection is visually determined.According to Terzaghi’s one-dimensional consolidation theory,the relationship between the logarithm of time factor and consolidation degree was obtained to calculate inflection point in the curve.Analysis of the settlement rate and time of soil samples to get the inflection point and the consolidation coefficient of soil sample was calculated.Because of the inflection point is in the primary consolidation stage,this method can avoid the influence of initial compression and secondary consolidation.This method only needs simple calculation,so it can avoid the human interference for the inflection point that visual determined.

关 键 词：固结系数 反弯点 计算 

分 类 号：TU433[建筑科学—岩土工程]