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蔡国军,程宇航,仲闯,等. 千枚岩饱水状态下软化效应试验分析[J]. 科学技术与工程, 2021, 21(8): 3032-3038.
Cai Guojun,et al.Experimental Analysis on Softening Effect of Phyllite in Saturated Water[J].Science Technology and Engineering,2021,21(8):3032-3038.
千枚岩饱水状态下软化效应试验分析
Experimental Analysis on Softening Effect of Phyllite in Saturated Water
投稿时间:2020-06-19  修订日期:2020-12-17
DOI:
中文关键词:  千枚岩  浸水软化  劣化效应  直剪试验  SEM
英文关键词:Phyllite  Soaking softening  Deterioration effect  Direct shear test  SEM
基金项目:自然资源部中国地质调查局地质调查项目(DD20190714);国家自然科学青年基金(No.41202209);国家自然科学基金面上项目(No.41977255);四川省科技计划(No.2019YJ0403)资助
                    
作者单位
蔡国军 ①.地质灾害防治与地质环境保护国家重点实验室成都理工大学
程宇航 ①.地质灾害防治与地质环境保护国家重点实验室成都理工大学
仲闯 ①.地质灾害防治与地质环境保护国家重点实验室成都理工大学
贾俊 中国地质调查局西安地质调查中心
赵大安 ①.地质灾害防治与地质环境保护国家重点实验室成都理工大学
冯伟强 ①.地质灾害防治与地质环境保护国家重点实验室成都理工大学
周扬 ①.地质灾害防治与地质环境保护国家重点实验室成都理工大学
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中文摘要:
      陕西省汉中地区发育大量软变质岩,在雨水浸润的条件下极易软化造成边坡失稳破坏。以略阳县菜籽坝楔形块体的千枚岩为研究对象,设计了在不同浸水条件下的岩石直剪试验,揭示了千枚岩在水岩作用下的破裂形式及劣化效应。研究结果表明:在浸水条件下,岩石力学参数随浸水时间增加而降低,至14d时变化微弱,逐渐趋于稳定;浸水初期颗粒间相互摩擦导致产生较多岩粉,浸水中后期颗粒在水岩作用下产生磨圆效应,颗粒间滑动使得岩粉明显减少;水岩作用对千枚岩力学特性的影响顺序为黏聚力>峰值应力>内摩擦角;根据SEM观察,得出岩石浸水软化是由微变形逐渐量化至宏观破坏的过程;千枚岩结构面粗糙度受水岩作用影响严重,这是诱发陕南地区软变质岩滑坡灾变的重要因素。
英文摘要:
      A large number of soft metamorphic rocks are developed in Hanzhong area of Shaanxi province, which are easy to soften under the condition of rainwater infiltration, causing slope instability and damage. Phyllite of the wedge-shaped block of Lueyang Cai Zi Ba is taken as the research object, and rock direct shear tests under different soaking conditions are designed to reveal the fracture form and deterioration effect of phyllite under the action of water rock. The results show that the rock mechanical parameters decrease with the increase of soaking time under the soaking condition, and change slightly at 14 days and gradually become stable. In the early stage of soaking, the particles rub against each other, resulting in more rock powder. In the middle and late stage of soaking, the particles produce rounding effect under the aqueous solution, and the sliding between the particles causes the rock powder to decrease obviously. The order of influence of water-rock action on the mechanical properties of phyllite is cohesion > peak stress > internal friction angle. According to SEM observation, it is concluded that rock softening in water immersion is a process from micro deformation to macro failure. Phyllite structural surface roughness is seriously affected by aqueous solution, which is the important factor inducing landslide and stabilizing failure of soft metamorphic rocks in southern Shaanxi.
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