广西合山电厂灰水对岩土层工程特性的影响

采用溶滤试验和渗透变形试验等方法,重点研究了广西合山电厂灰水对岩土工程性质的影响: 在灰水的长期作用下,溶解并带走土体中难溶的碳酸盐和Al2O3 胶结物等物质,造成土体骨架疏松,降低土体的胶结力,破坏土体的结构,从而使土体含水量、液性指数、渗透系数快速增长,土体渗透变形临界坡降则大幅度下降。因此,在灰水长期作用下,大大降低了土体抗变形和抗塌陷破坏的能力,加速土层中土洞的形成和发展。另外,灰水长期作用,还促进了岩溶作用,扩大了岩溶管道和裂隙,有利于塌陷的形成和发育。 

THE EFFECT OF ASH WATER ON ENGINEERING CHARACTERISTICS OF SOIL AND ROCK AT HESHAN POWER PLANT IN GUANGXI

With leaching test and seepage deformation test,the paper mainly studies the effect of ash water on engineering characteristics of soil and rock at Heshan power plant in Guangxi.The indissoluble carbonate and Al_2O_3 as well as other cementing materials are dissolved and taken away under long-term effect of the ash water,which loosen the soil framework,reduce the cementing force and destroy the structure.Consequently,the water content,liquidity index and seepage coefficient of the soil rapidly rise and the critical slope of the seepage deformation sharply falls.So the long-term work of ash water reduces the capability of resisting distortion and collapse.At the same time it also accelerates the development of karst,widens the karst openings and is propitious to the formation and development of collapse.