膨胀土膨胀量测定方法比较及改进

以高淳胥河某边坡膨胀土为研究对象，在对现行土工规范要求的以及部分科研人员采用的膨胀土有荷线膨胀率测定方法进行研究的基础上，分析了两种方法存在的问题，进而提出线膨胀率测定的改进方法。基于不同试验方法开展了膨胀土膨胀力及有荷线膨胀率试验,并对结果进行了比较研究。试验结果显示，在初始状态相同的情况下，改进方法测得的膨胀土线膨胀率最大，土工试验规范方法次之，部分科研人员采用方法所测得的线膨胀率最小，3种试验方法所测得的膨胀土线膨胀率都可以采用同一个公式来表示。不同试验方法对初始干密度较小、上覆压力小的膨胀土的线膨胀率、膨胀力测定影响较大。

Comparison and improvement to test methods of expansion capacity of expansive soil

Taking the expansive soil of Xuhe River slope in Gaochun County, Jiangsu Province as an object, based on the current specification of engineering and the research results of measurement method for loaded linear expansive ratio used by some researchers, the problems of the current two methods are analyzed and an improved method for linear expansive ratio measurement is put forward. The experiment of loaded linear expansive ratio and expansive force was conducted by different methods and the results were compared. It indicated that in the same initial state, the linear expansive ratio measured by the improved method is the largest, while the one measured by the methods suggested by some researchers is the minimum, and that measured by the geotechnical specification method is in between; the expansive ratio measured by the three methods can be expressed by one formula; the three measurement methods give bigger different results of linear expansive ratio when the expansive soil is in smaller dry density and overburden pressure.