粉质粘土动力特性的试验研究

An Experimental Reseach on Dynamic Properties of Sandy Clay

本试验研究的目的是为××线列车振动响应分析提供粉质粘土的动力参数。土样取自××线施工工地,使用的仪器是日制DTC—240通用大型三轴仪。测得××地区第四纪粉质粘土的动弹性模量、阻尼系数及强度指标。根据统计分析,该土的动应力——应变关系符合双曲线函数规律。据实测数据求得初始动剪切模量公式中的系数,其平均值为3204,与Hardin. B. O等人求得的结果(3260)很接近。因此,在缺乏试验条件的情况下,动剪切模量可用该土的物理性质指标进行估算。

In this paper, the dynamic parameters of sandy clay are presented for making traffic vibration response analyses. The soil samples are digged in work site on 'B-B' underground railway. The tests are made on the DTC-240 triaxial test apparatus. The dynamic shear modulus, damping ratio and strenth parameters of quaternary period sandy clay on'B-B' area have been obtained. Based on statistical method the relations of dynamic stress-strain are in keeping with the law of hyperbolic function. The coefficients of initial dynamic shear modulus formula have been obtained. The average value is 3204, that is approaching to Hardin's results(3260). So that, when the test conditions are lack of, the dynamic shear modulus can be estimated by the physical properties of sandy clay.