摘要
剪切波速是反映土体动力学特性的重要物理量之一,在土木工程抗震中有广泛的应用。本文收集整理了天津滨海地区500余口横波测井资料,在经纬向与垂直向以0.01×0.01×1m的三维网格进行线性插值,获得了天津滨海地区近地表剪切波速空间分布的精细图像。根据资料分布与地质构造背景,选取2个代表性波速剖面进行分析。结果表明,滨海地区浅部剪切波速结构具有明显的分层特征与横向不均匀性,进一步的分析认为,不同地质构造单元的速度结构具有明显差异,在大型区域或边界断裂两侧波速结构或受到扰动或受到明显影响,充分显示了天津滨海地区基底构造与断裂活动对晚第四纪沉积发展和地层发育的控制以及对工程地震地质条件评价的影响。
Shear wave velocity is one of the important dynamic characters of soil layer and has been applied widely in anti-seismatic engineering. In this paper, we used drill logging data from 500 logs and made a linear interpolation based on 0.01°× 0.01°× 1 m grid to obtain a shallow 3-D shear wave velocity structure of Tianj in coastal area. Two typical velocity profiles are selected based on the geological background to explain the relationship to the basement structure. The results show that the shear wave velocity structure is clearly characterized by stratification and lateral inhomogeneity. Moreover, the shear wave structre is significantly different in different tectonic units. Therefore, it is reasonable to believe that the basement structure and faults activity here in Tianjin coastal area have a good control of sedimentation development and strata formation in the Quaternary period, which will play an important role in seismic engineering and geological condition evaluation.
出处
《震灾防御技术》
2012年第2期130-136,共7页
Technology for Earthquake Disaster Prevention
基金
天津市科技创新专项资金项目(合同编号:07FDZDSF02102)
天津市矿产资源补偿费地质项目(合同编号:国土房任[2009]20号)联合资助
关键词
剪切波速
横波测井
天津滨海地区
波速结构
构造单元
断层
第四系
Shear wave velocity
Transverse wave well logging
Tianjin Coastal area
Velocity structure
Tectonic element
Fault
Quaternary
