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一、概 况 在山东省泰安县潘河桥头Ⅳ号工区,解决岩溶地区坍陷问题中,试验研究采用大比例尺高精度重力测量,取得一定效果。 工区内灰岩埋深一般在25米左右,其上为第四系复盖,地形平坦,第四系的密度为1.9～2.0克/厘米~3,灰岩的密度为2.5～2.7克/厘米~3,上部为鲡状灰岩,溶蚀现象十分明显,岩溶发育,溶洞直径小的有几厘米,大的有几米,但最大直径没有超过10米。鲡状灰岩下部为豹皮灰岩,结构致密,也有小的溶洞存在。溶洞中多数充填砂粒、粘土等第四系沉积物。
I. Overview In the area of Panhe Qiaotou, No. 4, Tai’an County, Shandong Province, to solve the problem of collapse in the karst area, the experimental study adopted large-scale high-precision gravimetric measurement and achieved certain results. Limestone in the work area is generally about 25 meters deep, covered by Quaternary facies, flat terrain, Quaternary density of 1.9-2.0 g / cm3, Limestone density of 2.5-2.7 g / cm ~ 3, the upper part of the limestone, dissolution phenomenon is very obvious karst development, a few centimeters small cave diameter, a few meters large, but no more than the maximum diameter of 10 meters. The lower part of the quasi-limestone is leopard-skin limestone, with compact structure and small cave. Most of the cave filled with sand, clay and other Quaternary sediments.