泰安属北方覆盖型岩溶地区,第四系覆盖层厚度25～30米,下伏寒武系石灰岩,浅层岩溶发育。近年来由于大量开采地下水,地面塌陷接踵而来。塌陷坑平面呈圆形至椭圆形,上口直径2～5米,可见深度一般小于8米,剖面形态多为坛子状。 为查明泰安地面塌陷原因,我们先后在铁路沿线附近选择了四个塌陷坑和一个塌陷群 Tai’an is a northern cover karst region, Quaternary covering thickness of 25 to 30 meters, under the Cambrian limestone, shallow karst development. In recent years due to extensive exploitation of groundwater, ground collapse followed. Subsidence pit plane was round to oval, the mouth diameter of 2 to 5 meters, we can see that the depth is generally less than 8 meters, cross-sectional shape and more for the jar-shaped. In order to find out the reasons for the ground collapse in Tai’an, we successively selected four collapsed pits and one collapsed group near the railway