地震波CT成像系统要点解析.ppt

Application of crosshole seismic wave CT in Karst Exploration 跨孔地震CT在岩溶探测中应用 Zhaowei 赵 伟 Content 主要内容 一．Introduction(引言) 二．The basic working principle of cross-hole seismic CT method(跨孔地震CT法基本工作原理) 三．Equipment introduction(仪器设备介绍) 四．Application example analysis(应用实例分析) 一．Introduction In the carbonate rock area, karst environmental geological problems have become increasingly prominent, highlights the growing importance of geological exploration of karst. The complexity of the resulting in karst geologic disasters of easy transportation construction process, such as ground collapse, water gushing, and mud and other geological disasters, casualties and significant loss of state property, the construction schedule of project. Therefore, we must strengthen geological karst region detection. The routine geophysical method is investigated in detail the distribution law of the karst underground space, earthquake CT in Karst detection effect is good 一．引 言 　 在碳酸盐岩地区，岩溶环境地质问题日益突出，岩溶地质勘探工作重要性日渐凸显。岩溶发育的复杂性导致交通建设过程中极易产生突发的地质灾害，如地面塌陷、隧道突水、突泥等地质灾害，造成人员伤亡和重大的国家财产损失，影响工程施工进度。因此，必须加强岩溶地区的地质探测。常规 物探方法很详细查清地下的岩溶的空间分布规律，地震CT在岩溶的探测方面效果较好。 Fundamental：According to the degree of fragmentation and distribution of seismic traveltime length or size of CT image attenuation which reflect the distribution of boundary and reliable rock all kinds of rock and soil. 根据走时长短或衰减大小构成的地震CT图像可靠反映各类岩土体的分布界线及岩体的破碎程度和分布。 Superiority： Opened up a new way of rock mass partitioning and velocity imaging------Higher than the conventional wave test resolution; on the karst fracture zone survey more efficient; more details can be used to evaluate the stability of the rock mass; can accurately determine spatial positions of geological anomaly。 开辟了岩体分区和波速成像的新途径------比常规波速测试分辨率更高；对岩溶破碎带的勘测更高效；可对岩体稳定性进行更全面更细节的评价；可准确确定地质异常的空间位置。 二、 Seismic CT principle地震CT原理 松散土层（Loose soil） 完整基岩（Complete bedrock） 震源控制器 电火花震源 地震仪 检波器链 跨孔地震CT工作示意图 接收孔 激发孔 Schematic diagram o