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4結(jié)論
1)陡崖逆向臺階狀地貌形跡是危巖階段性演化的宏觀表象，通過對陡崖地貌形跡的分析可以反演危巖發(fā)育規(guī)律及斜坡動力演化過程。
2)陡崖上危巖從坡腳向坡頂及從臨空面向山體內(nèi)部的發(fā)育過程即為危巖鏈式規(guī)律，包括從坡腳向坡頂逐漸崩落的多個微觀鏈和從臨空面向山體內(nèi)部逐漸后退的宏觀鏈。陡崖坡腳巖腔的形成過程及其卸荷效應(yīng)是三峽庫區(qū)危巖鏈式規(guī)律的孕育源。
3)危巖鏈式規(guī)律可分為簡單模式和復(fù)合嵌套模式，前者僅有一個宏觀鏈，后者包括兩個以上同時發(fā)育的宏觀鏈，三峽庫區(qū)危巖鏈式規(guī)律同時發(fā)育的宏觀鏈2~3個。
4)危巖鏈式規(guī)律揭示了三峽庫區(qū)內(nèi)危巖演化的內(nèi)在規(guī)律，是支撐、支撐-錨固聯(lián)合等危巖防治技術(shù)及萬州、云陽等長江兩岸大量崩積物形成機制的理論依據(jù)。進一步研究中，應(yīng)重點研究危巖鏈式演化的時間進程及力學(xué)演繹，據(jù)此評判現(xiàn)有陡崖所處的演化階段及其整體和局部安全壽命。
參考文獻
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