摘要
基于岩溶发育位置及程度等规律对现代城市开发建设的重要意义,利用二维微动剖面探测方法开展灰岩岩溶区地层结构探测,获得关于隐伏岩溶洞穴发育规律的新认识。二维微动探测方法利用天然源面波的优势,不受人文居住环境干扰限制,在浅层地质结构探测方面凸显出优势。利用该方法研究覆盖区岩溶发育规律,在福建永安大湖盆地内两处岩溶国家地下水监测井钻孔旁,通过钻孔孔内S波速度波速测试结果分析总结地层速度规律,同时二维微动剖面探测结果与钻探结果对比揭示,灰岩岩溶发育、不发育段的视S波速度分别为1 000～1 600 m/s,1 700 m/s以上,灰岩中溶洞的视S波速度为300～850 m/s,存在显著差异。利用微动视S波速度剖面,进一步揭示坑边和霞鹤地区地下岩溶洞穴虽整体发育形态表现为层状,但其发育形式主要为岩溶管道型;区内岩溶深度达160 m,发育深度与地形起伏有一定相关性。基于2处试验区的总结性规律,分析了大湖盆地内另一微动测线处的岩溶发育规律并得到验证。由此可见,通过微动剖面结果与钻孔对比分析规律,可利用该规律以微动剖面结果为基础推测该区域其他无钻孔区域的岩溶发育情况。结果表明,微动探测能较直观地探测覆盖型岩溶区地下灰岩溶洞的发育及空间分布情况,并可追踪分析岩溶的横向变化规律。
Based on the importance of karst development location and development degree,and the construction of modern cities,this paper uses the two-dimensional microtremor section detection method to detect the formation structure of limestone karst area,and obtains a new understanding of the development law of hidden karst caves. Two-dimensional microtremor section method makes use of the advantages of natural source surface wave and is not limited by the interference of human living environment,which highlights its advantages in shallow geological structure detection.In the Dahu basin of Fujian Yongan China,the coverage area of karst development law is studied by using this method.There are two karst groundwater monitoring wells in the area,where the analysis of well drilling cores S wave velocity test results summarizes the formation velocity law.At the same time,the two-dimensional microtremor profile detection results compared with drilling results reveal that the S wave velocities at the sections with limestone karst development and no development are 1 000-1 600 m/s and more than 1 700 m/s respectively.The S wave velocity at limestone cave is 300-850 m/s.There are significant differences in those sections.Based on the velocity profile of S-wave,it is further revealed that although the overall development pattern of underground karst caves in the Kengbian and Xiahe area is stratified,the development pattern is mainly karst pipeline. The karst depth in the area is 160 m,and the development depth is correlated with topographic relief.Based on the summative law of the two test areas,the karst development law of another microtremor survey line in the Dahu basin is analyzed and verified.It can be seen that by comparing and analyzing the law of microtremor profile results with that of borehole,the karst development in other non-borehole areas in this region can be inferred based on the law of microtremor profile results.The results show that the microtremor detection can directly detect the development and spatial distribution of underground limestone karst caves in the overlying karst areas,and can track and analyze the lateral variation rules of karst.
作者
黄光明
徐佩芬
李长安
凌甦群
赵举兴
杜亚楠
游志伟
江秋明
李传金
HUANG Guangming;XU Peifen;LI Chang’an;LING Suqun;ZHAO Juxing;DU Yanan;YOU Zhiwei;JIANG Qiuming;LI Chuanjin(School of Earth Sciences,China University of Geosciences,Wuhan 430074,China;Fujian Exploration Institute of Coalfield Geology,Fuzhou 350005,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China;Beijing Zhongkejiao Energy and Technology Co.Ltd.,Beijing 100083,China;Fujian Water Conservancy and Hydropower Engineering Bureau Company Limited,Quanzhou 362000,China;Fujian University of Technology,Fuzhou 350118,China)
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2019年第2期536-544,共9页
Journal of China Coal Society
基金
国家自然科学基金资助项目(41671011
41474044)
福建省自然科学基金高校联合资助面上项目(2018J01620)
关键词
微动探测
视S波速度
覆盖型岩溶
永安大湖盆地
microtremor survey
S-wave velocity structure
covered karst
Yongan Dahu Basin
