摘要
为了解电法勘探、地震勘探及重力勘探在吉利岩溶塌陷区应用的可行性,本研究分别对该区的土层及岩石进行分类采样,利用对称小四极,单孔地震纵波波速测试及环刀法分别对土层及岩石的样品进行电阻率、纵波波速及密度测试分析,结果表明充气土洞、充气溶洞与相应的围岩介质电阻率差异最大(∞),完整灰岩与充水溶洞的电阻率差异次之(14022.46Ω·m),粉质粘土与耕植土的电阻率差异最小(28.33Ω·m);完整灰岩与充气溶洞密度差异最大(2.64 g/cm3),裂隙或破碎灰岩与充气溶洞密度差异次之(2.30 g/cm3),含碎石粉质粘土与粉质粘土密度差异最小(0.07 g/cm3);完整灰岩与充气溶洞波速差异最大(>3660 m/s),裂隙或破碎灰岩与充气溶洞波速差异次之(3460 m/s),完整灰岩与裂隙灰岩波速差异最小(>200 m/s).土层、岩石及异常体之间的物性差异明显,适合开展电法、地震及重力勘探,另外,本研究还总结出吉利岩溶塌陷区耕植土、粉质粘土、碎石土、裂隙灰岩和完整灰岩的电阻率、弹性波速、物质密度的范围值、平均值、常见值、标准值,为岩溶塌陷区地球物理综合方法解释提供了可靠依据.
In order to understand the feasibility of the application of the electric prospecting,seismic exploration and gravity prospecting in the karst collapse area of Geely,This paper classified sampled the soil and rock samples in this area, using symmetric small quadrupole,single hole seismic longitudinal wave velocity test and ring method to test and analyse the resistivity,the wave velocity and the density of the soil and rock samples respectively. The results show that the difference of resistivity between aerated soil cave,aerated karst cave and surrounding rock medium is the largest,the resistivity difference between intact limestone and water filled karst cave is the second,the difference of resistivity between silty clay and cultivated soil is the smallest; The density difference between intact limestone and aerated karst cave is the biggest,the density difference between fractured,broken limestone and aerated karst cave is the second,the difference of the density between the gravel bearing silty clay and silty clay is the smallest; the difference of wave velocity between intact limestone and aerated karst cave is the biggest,the difference of wave velocity between fractured,broken limestone and aerated karst cave is second,the difference of the wave velocity between the intact limestone and the fractured limestone is the smallest. The physical property differences among the soil,the rocks and the abnormal bodies are obvious. It is suitable for the development of electric, seismic and gravity prospecting,In addition,this study get the range value,average value,common values and the standard value of resistivity,elastic wave velocity and density of cultivated soil,silty clay,gravel soil,fractured limestone and intact limestone in the Geely karst collapse area,Which provides reliable basis for the interpretation of the geophysical synthetic method in karst collapse area.
出处
《地球物理学进展》
CSCD
北大核心
2016年第2期920-927,共8页
Progress in Geophysics
基金
中国地质调查局水([2012]01-034-005)
岩溶塌陷地球物理勘探试验
关键词
物性
电阻率
弹性波速
密度
physical properties
resistivity
elastic wave velocity
density
