论文部分内容阅读
探讨了高密度电法、高精度重力法、地震反射法和主动源面波法在浅覆盖红层碎屑可溶岩塌陷地区对土洞和浅部溶洞的探测效果.通过各方法与动力触探、钻探资料的对比发现:地震反射法能评价潜在土洞的大小和埋深,在地震反射时间剖面上呈现同相轴错断、缺失的特征.不同极距的高密度联剖曲线正交点点位能评价溶洞的发育方向;反演的横波低波速段和电阻率剖面低阻圈闭区、“V”型区与溶洞的顶底板埋深吻合;在同等探测深度情况下,小点距的高密度电法具有更高的分辨率.高精度重力布格曲线上的“V”型低值区能定性评价潜在土洞和溶洞的发育.在红层塌陷区进行地球物理调查时,对土洞的探测推荐使用地震反射法和高精度重力法组合,对浅部溶洞的探测推荐使用高密度电法、主动源面波和高精度重力法组合.
The detection effect of high-density electrical method, high-precision gravity method, seismic reflection method and active surface wave method on cave and shallow karst cave in the shallow covered red layer detritus soluble rock collapse area is discussed. The comparison of drilling data shows that the seismic reflection method can evaluate the size and depth of potential soil holes and show the features of missing and missing events in seismic reflection time profiles.However, Can evaluate the development direction of karst cave; the inversion of the low-shear-wave velocity section of the shear wave and the low-resistivity trap area of the resistivity profile coincide with the top and bottom of the karst cave; at the same probing depth, High-density electrical method has higher resolution.The “V” low-value region on the high-precision gravitational Bouguer curve can qualitatively evaluate the development of potential soil caverns and caverns.When geophysical survey is carried out in the red layer subsidence area For the detection of soil holes, the combination of seismic reflection method and high-precision gravity method is recommended. For the detection of shallow cave, high-density electric method, active surface wave and high-precision gravimetric method are recommended.