用沉降速率比值法计算固结系数的探讨  

Discussion of settlement-velocity ratio method for evaluating consolidation coefficient

作　　者：王军保[1,2] 刘新荣[1,2] 李鹏[1,2] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《岩土力学》2011年第10期3085-3088,共4页Rock and Soil Mechanics

基　　金：国家留学回国人员科研启动基金重点项目资助(教外司留[2002]247号);国家自然科学基金创新群体基金资助(No.50621403)

摘　　要：目前确定固结系数的常用方法是时间对数法和时间平方根法,这两种方法均为作图法,受人为因素的影响较大。从太沙基一维固结理论出发,推导出了任意相邻两时刻地基固结沉降速率之间的关系式,并通过用最小二乘法处理数据,得到了一种计算地基土体固结系数的方法。最后,通过工程实例应用对其合理性和可行性进行了验证,结果表明,该方法计算效果良好,且无需作图,简便易行,可以对试验数据进行快速处理。同时,该方法只需试验前期1 h之内的数据,可以减少测读次数,加快试验进程。At present,the common methods for evaluating consolidation coefficient are the logarithm of time and the square root of time methods,both of which are graphical methods.In these two methods,there are some large influences of the man-made factors during graphical construction.The relationship between settlement-velocity of arbitrary moment and settlement-velocity of next moment is developed based on the one-dimensional consolidation theory,which provides a new method for evaluating consolidation coefficient by analyzing the measured data with the least square method.Then the rationality of the new method is verified through project cases study;and the results indicate that the new method can determine the consolidation coefficient with high accuracy and convenience to use.In addition,when the new method is adopted for evaluating consolidation coefficient,the latter measured data after an hour is not necessary,which means that the process of consolidation test can be accelerated.

关 键 词：固结系数 沉降速率 比值 计算 

分 类 号：TU411[建筑科学—岩土工程]