三峡库区泥质灰岩溶蚀作用与边坡岩体破坏

The dissolution process and the rock mass breakage of marlite slope in Three Gorges Reservoir Region

三峡库区泥质灰岩边坡的溶蚀与破坏问题,影响到三峡工程的顺利进行,正确掌握它的破坏规律,有利于边坡治理与防护工作。本文从岩体的基本地质信息入手,分析溶蚀作用从不同方面对边坡工程性质的影响。主要包括:岩体内部可溶岩成分被溶蚀后泥质成分富集,岩体成份发生变化;岩体密集节理裂隙发育,结构疏松,成为溶蚀液体的入渗通道,加剧深层岩体的溶蚀作用发生。溶蚀作用叠加不同的地质破坏因素后,三峡库区泥质灰岩岸坡的变形破坏类型总结为三类:薄-中厚层块裂式破坏、中-厚层点裂式破坏、厚-巨厚层层裂式破坏。

The dissolution process and the rock mass breakage of marlite slope in Three Gorges Reservoir Region affect the Three Gorges Project to go along. Holding the breakage law benefits to the dope＇s control and fence. The article begins with the basic geology information. And the different relations between the dissolution process and the slope rock mass properties are analyzed. ＂The central contents include two parts. Firsdy, the dissolvable minerals are dissolved and the mud component is enriched. The mineral ingredients have changes. Secondly, the dense joints and crannies develop in the rock mass. Therefore the rock mass structures turn loose. The joints and crannies become the infiltration path for the solution liquid. All these accelerate the dissolution process in the deep part of rock bed. So the dissolution process, together with many geological breakage factors, rebuild the marlite slope in the different breakage styles, which can be summarized in three types： block split in the thin-medium bed, point split in the medium-thick bed, layer split in the thick-huge bed.