贵州省鸡场滑坡地下水化学特征 反映的水-岩（土）作用. (Chinese)

The water-rock/soil interaction of a landslide is a complex physical and chemical synthesis, which seriously affects the stability of the slope. Research on the water-rock/soil interaction of a landslide on the occurrence of geological disasters is relatively weak. This article takes the Jichang landslide as the research object, analyzes the characteristics of the mineral composition and chemical composition of the rock and soil in the landslide area, combines the compositional changes of bedrock fissure water and atmospheric precipitation in the area, and uses the principal component analysis method to study the water-rock of the Jichang landslide The process of action and the influence of water and rock evolution on the stability of landslides are analyzed. The results show that: (1) The weathering process of basalt in the sliding body is a water-rock interaction coupled by mechanical crushing-mineral alteration, occurring on “micro-micro-macro” three scales. (2) The first three factors, accounting for 49.365%, 27.135%, and 15.092% of the total variance, respectively, are selected to analyze the chemical characteristics of groundwater. The main factor Z 1 reflects the control effect of the dissolution of basalt primary minerals on the chemical composition of the groundwater, the main factor Z 2 reflects the evaporation of groundwater and the precipitation of minerals in which the solubility of SiO 2 changes with pH, and the main factor Z 3 reflects the ion exchange between groundwater and rock (soil) with the main participating ions being Mg 2+ and K + . (3) The products of water-rock interaction are mainly clay minerals such as illite, smectite and chlorite, which increase the content of clay minerals in the structural plane of the rock mass, deteriorate and damage the rock mass, significantly influcing the formation of slip zones and the disintegration of landslides. The results of principal component analysis of groundwater can reflect the main process of interaction between landslide groundwater and rock/soil. [ABSTRACT FROM AUTHOR]

滑坡体水-岩 (土) 作用是一种复杂的物理化学综合作用, 影响坡体的稳定性, 但关于目前水-岩 (土) 相互作用对地质 灾害发生方面的影响研究仍较为薄弱. 以贵州省鸡场滑坡为研究对象, 分析滑坡区岩土体矿物组成和化学成分特征, 结合 区域内基岩裂隙水、大气降水的成分变化, 利用主成分分析方法, 研究鸡场滑坡水-岩 (土) 作用过程, 并分析水岩演化作用 对滑坡稳定性的影响. 结果表明： (1) 滑体内玄武岩的风化过程是一种机械破碎-矿物蚀变耦合的水-岩相互作用, 发生在 “微观-细观-宏观”3 种尺度上； (2) 选取前 3 个因子 Z 1 、Z 2 、Z 3 (分别占总方差的 49.365%、27.135%、15.092%) 分析地下水的化 学特征, 主因子 Z 1 反映了玄武岩原生矿物的溶蚀作用对地下水化学成分的控制作用, 主因子 Z 2 反映了地下水的蒸发作用与 SiO 2 溶解度随 pH 变化的矿物沉淀作用, 主因子 Z 3 反映了地下水与岩 (土) 体间存在离子交换作用且主参与离子为 Mg 2+ 和 K + ； (3) 水岩作用产物主要为伊利石、蒙皂石、绿泥石等黏土矿物, 使得岩体结构面内黏土矿物含量增加, 岩体劣化损伤, 对滑带 的形成及滑坡的解体产生重要影响. 由此研究说明滑坡地下水与岩土体相互作用的主要过程能被主成分分析结果充分反映. [ABSTRACT FROM AUTHOR]

Copyright of Hydrogeology & Engineering Geology / Shuiwendizhi Gongchengdizhi is the property of Hydrogeology & Engineering Geology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)