本文關(guān)鍵詞：三峽庫區(qū)望霞危巖體孕災(zāi)地質(zhì)環(huán)境條件分析，，由筆耕文化傳播整理發(fā)布。

三峽庫區(qū)望霞危巖體孕災(zāi)地質(zhì)環(huán)境條件分析

An Analysis of Disaster-pregnant Geological Environment Conditions of the Wangxia Unstable Rock Mass in the Three Gorges Reservoir

[1] [2] [3] [4] [5] [6]

LE Qi-lang, WANG Hong-de, GAO You-long, XUE Xing-qiao, WANG Gao-feng, SUN Xiang-dong （ Center for Hydrogeology and Environmental Geology Survey, China Geological Survey, Baoding

中國地質(zhì)調(diào)查局水文地質(zhì)環(huán)境地質(zhì)調(diào)查中心,河北保定071051

文章摘要：危巖體是一種典型的災(zāi)害地質(zhì)體,其形成、變形與破壞受控于地質(zhì)環(huán)境條件,地質(zhì)基礎(chǔ)要素在孕災(zāi)的過程中起著決定性作用,各基本地質(zhì)要素與災(zāi)害形成的關(guān)系是研究危巖體變形規(guī)律和破壞機(jī)理的關(guān)鍵性問題。通過對三峽庫區(qū)望霞危巖體區(qū)域地質(zhì)構(gòu)造作用分析,橫石溪背斜構(gòu)造解析,各類地質(zhì)結(jié)構(gòu)面發(fā)育特征統(tǒng)計(jì)和危巖體巖性組合方式及工程地質(zhì)條件剖析,結(jié)合危巖體兩次變形破壞過程,分析各因素對危巖體的形成及變形的關(guān)系。研究認(rèn)為：孕育望霞危巖體的橫石溪背斜雛形形成于印支期的隆升階段,至燕山主期形成褶皺主體,后期則以繼承性改造為主,危巖體的形成及孕育主要集中在背斜核部區(qū)域,樞紐位置尤為發(fā)育。控制危巖體變形的5條關(guān)鍵裂縫與頂部發(fā)育的“V”字形裂縫關(guān)系密切,其是在縱彎褶皺作用下背斜頂部脆性巖層受到強(qiáng)烈的拉裂影響,疊加臺階式層間滑動作用,形成與軸面近于平行的拉張裂縫。在望霞危巖體中發(fā)育多組地質(zhì)結(jié)構(gòu)面,其中原生結(jié)構(gòu)面對各條關(guān)鍵裂縫及關(guān)鍵塊體提供基礎(chǔ)背景值,控制其規(guī)模、范圍及變形強(qiáng)度�？刂浦�變形關(guān)鍵部位特別是前緣軟弱層變形位置、牽引區(qū)段及強(qiáng)烈程度。構(gòu)造結(jié)構(gòu)面主要控制關(guān)鍵裂縫的延伸方向、距離及樣式,控制關(guān)鍵塊體的變形方向,裂解范圍及規(guī)模,掉塊及崩裂位置,控制危巖體底部關(guān)鍵部位即壓張裂縫的形成位置、張開度及位移方向。次生結(jié)構(gòu)面主要控制后緣變形區(qū),對各條關(guān)鍵裂縫控制其繼承性變形,控制關(guān)鍵塊體擴(kuò)張,對巖體裂解破壞至關(guān)重要。同時(shí),望霞危巖體在地層巖性上構(gòu)成了典型的硬—軟—硬巖性組合,為危巖體的變形提供了地質(zhì)結(jié)構(gòu)組合條件,其底部大面積的采空區(qū)控制著危巖體整體滑塌變形。

Abstr：Unstable rock mass is a typical kind of hazard geological body. Its formation, deformation and damage are controlled by the geological environmental conditions. Geological basic elements play a decisive role in the disaster-pregnant process. The relationship between geological basic elements and the formation of the disaster is the key issue in the study of the deformation regularity and failure mechanism of the unstable rock mass. The authors made an analysis of such relationship on the basis of the regional geological tectonism, the Hengshixi anticline structure, the development of geological structural planes, the lithologic combination and the engineering geological conditions, in conjuction with the unstable rock mass deformation and failure process. The researches show that the Hengshixi anticline structure that bred the Wangxia unstable rock mass was formed at the uplift stage in Indo-Chinese epoch. The fold appearance was formed mainly in Yanshanian, and later gave way to inheritance transformation. The unstable rock mass was form ed mainly in the arch core area, particularly the hinge position of the fold. The five kinds of critical cracks that controlled the deformation of the rock mass had close relationship with the ＂V＂-shaped cracks at the top of the rock. The brittle rock at the top of the anticline was affected by strong tensile splitting under the influence of buckle fold effect and the superposition of the stepladder interlayer-gliding effect. As a result, the tensile cracks almost parallel to the axial surface of fold were formed. Groups of geological structural planes were developed in the Wangxia unstable rock mass. The primary structural plane provides background for every critical crac

文章關(guān)鍵詞：

Keyword：:Three Gorges Reservoir unstable rock mass geological conditions structural plane characteristics interlayer-gliding

課題項(xiàng)目：本文由中國地質(zhì)調(diào)查局地質(zhì)調(diào)查項(xiàng)目（編號：12120113008200）資助.

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  本文關(guān)鍵詞：三峽庫區(qū)望霞危巖體孕災(zāi)地質(zhì)環(huán)境條件分析，由筆耕文化傳播整理發(fā)布。