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工程科学与技术:2016,48(6):8-15
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开挖与卸载交替作用对上陡下缓型高陡层状岩质边坡变形失稳影响试验研究(“第六届水利水电岩土力学与工程学术研讨会”推荐稿件)
(昆明理工大学)
Experiment of Alternating Actions of Excavation and Unload Effects on Deformation and Instability of High and Steep Bedding Rock Slopes with Upper Steep and Lower Gentle Style
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投稿时间:2016-04-26    修订日期:2016-08-28
中文摘要: 上陡下缓型高陡层状岩质边坡在我国西部地区典型发育,开挖与卸载交替作用对其变形失稳破坏具有非常重要的影响。以云南磷化集团有限公司所属尖山磷矿上陡下缓型高陡层状岩质边坡为工程背景,依据相似理论开展了模型试验研究,分析开挖与卸载交替作用对这类型岩质边坡变形失稳的影响。结果表明:上陡下缓型高陡层状岩质边坡随开挖深度的逐渐增加,其对应的位移变形量也逐步变大,边坡整体上表现为上部向下运动,下部受压向临空面方向隆起的变形规律,同时当开挖至一定的深度后,坡面与坡中均会发育较多的走向裂缝,且随着开挖深度的不断增加,其不断向坡体深部延伸发展;在整个开挖过程中,坡体中会发育形成“平面与圆弧面复合型”类型的潜在最危险滑移面,且表现为“滑移-弯曲-剪切”的变形失稳破坏特征;对边坡开展的浅部卸载作用效果不理想,虽其位移变形量有所减小,但没改变坡体整体的变形失稳趋势,然对边坡施加的深部卸载作用效果非常明显,使坡面及坡顶产生的裂缝几乎完全消除。研究结果可为我国西部大开发过程中面临的上陡下缓型高陡层状岩质边坡的预警预报与治理设计提供参考。
Abstract:Alternating actions of excavation and unload have a very important influence on deformation and instability of high and steep bedding rock slopes with upper steep and lower gentle style, which are widely distributed i in China's western regions. Taken the high and steep bedding rock slopes belonging to Jianshan phosphorite mine, Yunnan phosphate group Co., Ltd as engineering background, model experiment had been conducted on the basis of similarity theory, alternating actions of excavation and unload effects on their deformation and instability were investigated. Research results showed that: deformation displacements of high and steep bedding rock slopes with upper steep and lower gentle style progressively becomes larger with depth of excavation gradually increasing. Its integral deformation laws are that upper slope moves downward, while lower part uplift to the free surface due to compression. At the same time, when the excavation is to a certain depth, many strike cracks can be developed into the slope, then they continuously extended to the slope body in pace with increasing excavation depth; during the whole process of excavation, potentially most dangerous slip surface of composite-style with plane and circular arc surface have be developed gradually into the slope, and deformation and instability characteristics of slip—bending—shear style have be shown; although the deformation of the slope is reduced, the trend of deformation and instability of slope is not changed, so the shallow unloading effect is not ideal, while deep unloading effect is very obvious and cracks in the slope almost completely eliminated. Research achievements play a reference guiding role for early warning and forecast and control design of high and steep bedding rock slopes.
文章编号:201600419     中图分类号:    文献标志码:
基金项目:国家自然科学基金(41071058,41402272);云南省应用基础研究计划项目(2015FB122),云南省省级人培项目(KKSY201421016 ); 云南省教育厅科学研究基金重点项目(No.2014Z031)
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Yang Zhi-Qan  yzq1983816@163.com 
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杨志全.开挖与卸载交替作用对上陡下缓型高陡层状岩质边坡变形失稳影响试验研究(“第六届水利水电岩土力学与工程学术研讨会”推荐稿件)[J].工程科学与技术,2016,48(6):8-15.
Yang Zhi-Qan.Experiment of Alternating Actions of Excavation and Unload Effects on Deformation and Instability of High and Steep Bedding Rock Slopes with Upper Steep and Lower Gentle Style[J].Advanced Engineering Sciences,2016,48(6):8-15.