文章摘要
钱雪晋, 蔡征龙.考虑块石随机空间分布的土石混合体边坡稳定性研究Journal of Water Resources and Water Engineering[J].,2021,32(4):200-205
考虑块石随机空间分布的土石混合体边坡稳定性研究
Study on stability of soil-rock mixture slope considering random distribution of rock blocks
  
DOI:10.11705/j.issn.1672-643X.2021.04.27
中文关键词: 边坡稳定  土石混合边坡  块石随机空间分布  可靠度
英文关键词: slope stability  soil-rock slope  random distribution of rock blocks  reliability
基金项目:国家重点研发计划项目(2017YFC1501100); 湖北省教育厅科学技术研究计划优秀中青年人才项目(Q20201203)
Author NameAffiliation
QIAN Xuejin1, CAI Zhenglong2 (1.贵州省水利水电勘测设计研究院有限公司, 贵州 贵阳 550002 2.三峡大学 水利与环境学院 湖北 宜昌 443002) 
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中文摘要:
      为准确定量评价块石随机空间分布对土石混合体边坡稳定性的影响,分别采用随机块石模型和等效强度参数可靠度两种方式对土石混合体边坡稳定进行评价。首先,利用随机块石模型生成块石随机空间分布的土石混合体边坡,然后采用有限元强度折减法分析评价块石的随机分布对边坡稳定性的影响。与之同时,将随机分布的土石混合体等效为一定取值范围区间的均匀材料,结合响应面法对土石混合体边坡进行不确定性分析评价。研究结果表明:随机块石模型能直观反映因随机块石而引起塑性剪切带的“绕石”“分流”现象,且空间分布的不同对其影响也不尽相同。而等效强度参数可靠度模型则有利于对土石混合体边坡的稳定性进行工程定量评价。
英文摘要:
      In order to quantitatively evaluate the influence of random spatial distribution of rock blocks on the stability of soil-rock mixture slopes, the random rock block model and equivalent strength parameter reliability model were adopted to evaluate the stability of a soil-rock mixture slope. At first, the random rock block model was used to generate a soil-rock mixture slope with random spatial distribution of rock blocks. Then, the strength reduction method of finite element analysis was used to evaluate the influence of the random distribution of rock blocks on the stability of the slope. At the same time, the uncertainty and risk analysis of the soil-rock mixture slope was carried out using response surface method, considering the soil-rock mixture with the random distribution of rock blocks was equivalent to a homogeneous material with the values of its shear strength parameters falling in a certain range. The results show that the random block model can reveal the phenomena of “bypassing the blocks” and “splitting” of multiple plastic shear zones when encountering random blocks, and different spatial distribution of rock blocks have different influence on the plastic shear zones. What’s more, the equivalent strength parameter reliability model is suitable for the engineering quantitative evaluation of the stability of soil-rock mixture slopes.
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