葛洲坝至双河超高压输电线路经过荆门膨胀土地区。正确的评价膨胀土塔基工程地质性质,对于处理线路铁塔基础问题,有很大的现实意义。 一、葛—双线膨胀土的地质特征 葛-双线膨胀土以荆门大断裂为界,分东西两部分。断层以西,膨胀土是以震旦系至三叠系碳酸盐岩及侏罗系碎屑岩为母岩的残积层或坡残积层。残积膨 Gezhouba to Shuanghe EHV transmission lines through the Jingmen expansive soil area. Correctly evaluating the engineering geological properties of expansive soil base has great practical significance for dealing with the basic problems of line tower. Ge - double geostrophic expansive Ge Ge - double-line expansive soil to the Jingmen big fault as a community, divided into two parts. To the west of the fault, the expansive soil is a residual layer or slope residual layer that takes Sinian to Triassic carbonate rocks and Jurassic clastic rocks as parent rocks. Residual product swelling