被动源面波法在高标准农田场地类别划分中的应用  

Application of Passive Source Surface Wave Method in Classification of high standard Farmland Sites

作　　者：曹旭 Cao Xu(Shanghai Investigation Desigh&Research Institute Co.,Ltd.Shanghai 200434,China)

机构地区：[1]上海勘测设计研究院有限公司,上海200434

出　　处：《吉林水利》2022年第6期13-16,共4页Jilin Water Resources

摘　　要：建筑场地类别对于场地动峰值加速度和地震影响特征周期的确定有重要作用,准确的划分场地类别对于工程勘察具有重要意义。目前,场地类别的划分主要根据相关规范,以土层等效剪切波速和场地覆盖层厚度为准。土层等效剪切波速和场地覆盖层厚度的计算均以场地岩土剪切波速为依据进行。目前,剪切波测试主要以孔内测试为主,但在无地质钻孔或钻孔塌孔的情况下,孔内剪切波工作无法进行。本文将被动源面波法成功应用到建筑场地类别判定中:利用被动源面波法获取的频散曲线,经反演得到地层剪切波速,有效的计算场地等效剪切波速,并结合覆盖层厚度对场地类别进行划分。经地质钻孔对比结果表明,被动源面波法在场地类别判定中具有很好的适用性和准确性。The classification of construction site plays an important role in the determination of site dynamic peak acceleration and seismic impact characteristic period.Accurate classification of site category is of great significance for engineering investigation.At present,the classification of construction sites is mainly based on Relevant specifications,and the equivalent shear wave velocity of soil layer and the thickness of site overburden shall prevail.The equivalent shear wave velocity of soil layer and the thickness of site overburden are calculated based on the shear wave velocity of site rock and soil.At present,the shear wave test is mainly in-hole test,but the in-hole shear wave work cannot be carried out without geological drilling or borehole collapse.In this paper,the passive source surface wave method is successfully applied to the classification of construction sites:using the dispersion curve obtained by the passive source surface wave method,the formation shear wave velocity is obtained through inversion,the equivalent shear wave velocity of the site is effectively calculated,and the site category is divided in combination with the overburden thickness.The comparison results of geological boreholes show that the passive source surface wave method has good applicability and accuracy in site classification.

关 键 词：被动源面波法 频散曲线 反演 剪切波速 场地类别划分 

分 类 号：TV221[水利工程—水工结构工程]