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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第11卷    第1期    总第57期    2014年2月

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文章编号:1672-7029(2014)01-0074-08
水力作用下单层后缘张裂型顺层岩质边坡稳定性计算方法
李振存1,2,曾胜1,韦慧1,赵健1,李文1,郭昕1

(1. 长沙理工大学 交通运输工程学院,湖南 长沙 410004;
2. 公路工程省部共建教育部重点实验室(长沙理工大学),湖南 长沙 410004
)

摘 要: 针对水力作用下顺层岩质边坡稳定性问题,建立顺层边坡水力简化模型,对水力作用下边坡受力状态进行分析;通过干湿循环室内试验,对水作用下软弱滑动面强度衰减规律进行研究;综合考虑边坡的水力作用及软弱滑动面强度衰减,对水力作用下单层后缘张裂型顺层岩质边坡稳定性计算方法进行优化;依据达西定律,提出顺层岩质边坡滑移破坏判断指标;最后采用降雨条件下边坡开挖模型试验对理论计算结果进行验证。研究结果表明:边坡水力作用大小与后缘张拉裂隙充水高度呈正比;水作用下软弱滑动面黏聚力呈幂函数形式衰减,内摩擦角呈二次函数形式衰减;边坡后缘裂隙充水高度和降雨强度主要受软弱滑动面的强度影响;实例分析结果与理论计算结果具有较好的一致性。

 

关键字: 水力作用;顺层岩质边坡;稳定性计算方法;软弱滑动面;判断指标

Stability calculation method of monolayer bedding rock slope with back crack under hydraulic action
LI Zhencun1,2,ZENG Sheng1,WEI Hui1,ZHAO Jian1,LI Wen1, GUO Xin1

1.School of Traffic and Transportation Engineering,Changsha University of Science and Technology,Changsha 410004,China;
2. Key Laboratory of Highway Engineering (Changsha University of Science & Technology),Ministry of Education,Changsha 410004,China

Abstract:According to the stability issues of bedding rock slope under hydraulic action,a simplified hydraulic modle for bedding slope was established to analyze the stress state. By laboratory tests with action of method,the strength attenuation law of soft slip surface was investigated. The stability calculation for mondayer bedding rock slope with back crack under hydraulic action was optimized through comprehensive consideration of the hydraulic effect and the strength attenuation of soft slip surface. Based on Darcy law,slope failure judgment indexes were proposed. At last, theoretical analysis results were verified by slope excavation model test under rainfall condition. The results show that the magnitude of hydraulic action is positive to the water filling height in tension crack. Cohesion of soft slip surface decayed in the form of power function and the internal friction angle decayed in the form of quadratic function under action of dry-wet cycling. The critical values of water filling height in tension crack and rainfall intensity are mainly affected by the strength of soft slip surface. The results of actual projects are consistent with the theoretical analysis results.

 

Key words: hydraulic action;bedding rock slope; stability calculation method;soft slip surface; judgment indexes

ISSN 1672-7029
CN 43-1423/U

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