武汉市区土动力学参数统计分析

为探究武汉市区土体动力学参数特性,收集了武汉市区146个工程场地353个钻孔的资料,并结合在武汉地震工程研究院有限公司进行的土体动三轴试验结果,整理出武汉市区530组土样的动力学数据。筛选后,根据武汉市区土体性质及土层深度分布的具体情况进行分组,以统计均值的形式给出武汉市区6种典型土体在不同埋深下动剪切模量比G/G_max和阻尼比λ的参考值,并以粉质黏土、黏土及淤泥质土为例,以拟合曲线的形式给出G/G_max,λ随剪应变γ变化的平均曲线。通过与规范值、行业推荐值对比,得出武汉市区土体动剪切模量比受埋深影响相对较小,接近于行业推荐值,而阻尼比与规范值、行业推荐值相比大小关系不固定等结论。该结果可供武汉市区地震安全性评价工作和岩土地震工程应用参考使用。

Statistical Analysis of Soil Dynamics Parameters in the Urban Area of Wuhan

In order to explore the features of soil dynamics parameters, first we sorted out 530 groups of soils dynamic data by collecting data obtained from 353 boreholes in 146 sites as well as the results of dynamic triaxial test in the urban area of Wuhan. Then, we classify the data into groups according to soil properties and depth distribution of soil layer. Furthermore, we give the statistical mean value of dynamic shear modulus ratio and damping ratio of 6 typical soils. We take silty clay, clay and mucky soil as examples to present fitted curves of dynamic shear modulus ratio vs. shear strain and damping ratio vs. shear strain. Through comparison with code values and recommended values, we conclude that dynamic shear modulus ratio is limitedly affected by embedded depth, near to recommended value, whereas relationships among damping ratio of urban area in Wuhan, code value and recommended value are undetermined. The research results can be used as reference for evaluation of seismic safety and application in geotechnical seismology engineering.