现场和室内测试最大动剪切模量的对比研究

Comparative study on field and laboratory test of maximum dynamic shear modulus

采用现场波速法和共振柱试验法,研究现场和室内测试最大动剪切模量的差异。选取西安、杭州和山东3个不同区域典型场地的实际钻孔资料,分别采用现场波速法和室内试验法求出最大动剪切模量,并对试验结果进行对比分析。结果表明,现场波速法和室内共振柱试验法测得的最大动剪切模量确实有明显差异,现场波速法测得的最大动剪切模量总是要比室内试验法测得的结果大,最大相差可达2倍左右。从总的趋势来看,增大的程度和土层埋深也有一定的关系,土层埋深越大,现场波速法和室内试验法测得的结果差值也越大。

The dynamic shear modulus （DSM） is the most basic soil parameter in earthquake or other dynamic loading conditions and can be obtained through testing in the field and in the laboratory. By testing three engineering sites of Xian, Hangzhou and Shandong, the experimental result of maximum dynamic shear modulus by using resonant column devices is compared with the field test data obtained from shear wave velocity measurement in the paper. The results here indicate that the difference of the maximum dynamic shear modulus between field and laboratory test is significantly larger. The result obtained by field test is always larger than the result obtained by laboratory test and the maximum difference is double. Moreover, it is seen that the difference degree of maximum dynamic shear modulus increases with increasing of the deep of soil layers.