黄河冲积平原细粒土小应变剪切模量试验研究  

Experimental Study on Small Strain Shear Modulus of Fine Grained Soil in the Yellow River Alluvial Plain

作　　者：王津津[1] 王志才[1] 高涛 宋润钊 Wang Jinjin;Wang Zhicai;Gao Tao;Song Runzhao(Earthquake Administration of Shandong Province,Ji'nan 250014,China)

机构地区：[1]山东省地震局,济南250014

出　　处：《震灾防御技术》2024年第4期675-684,共10页Technology for Earthquake Disaster Prevention

基　　金：国家自然科学基金项目(YB2308、41974105、YW2304)。

摘　　要：本文通过采用原位波速法、弯曲元试验法和共振柱试验法,深入探讨了室内测试与原位波速法在小应变剪切模量试验中的差异。选取山东省境内黄河冲积平原典型场地细粒土钻孔资料,统计原位波速法和室内测试2种测试手段测得的剪切波速,并对测试结果进行对比分析。研究结果表明,在保持土的有效应力状态和减少土样扰动的基础上,原位波速法、弯曲元试验法和共振柱试验法测得的小应变剪切模量总体趋势一致,原位波速法的结果普遍小于室内测试的结果,但相对误差大多不超过10%。其中弯曲元试验法测试细粒土得到的小应变剪切模量与原位波速法的结果更为接近。建议工程实践中采用弯曲元试验法快速测得细粒土小应变剪切模量。将Rampello的经验公式描述的小应变剪切模量与实测结果进行对比,给出相关土层经验参数。研究结果可为该地区地下工程计算分析中小应变剪切模量的估算提供参考。This study investigates the differences in small strain shear modulus(Gmax)measured using laboratory tests and the in-situ wave velocity method.The research utilizes data from a typical fine-grained soil site in the Yellow River alluvial plain,Shandong Province,China.The shear wave velocities measured by both in-situ wave velocity and laboratory methods(including bending element and resonant column tests)were compared.The results demonstrate a consistent trend in Gmax values across all methods,assuming the effective stress state of the soil is maintained and sample disturbance is minimized.While Gmax values from the in-situ wave velocity method tend to be lower than those from laboratory tests,the relative errors are generally less than 10%.The bending element test yields Gmax values that are closer to those obtained from the in-situ wave velocity method.It is suggested that,for engineering applications,the bending element test offers a quick and accurate means of determining the small strain shear modulus of fine-grained soils.Additionally,Rampello's empirical formula for Gmax is compared to the measured results,and the relevant empirical parameters for different soil layers are provided.These findings offer valuable insights for estimating the shear modulus at small and medium strains in underground engineering design and analysis in this region.

关 键 词：细粒土 小应变剪切模量 原位波速法 弯曲元 共振柱 

分 类 号：TU4[建筑科学—土工工程]