隧道洞口段危岩崩塌落石冲击风险评价研究

发布时间：2018-03-29 14:21

  本文选题：隧道洞口　切入点：落石灾害　出处：《铁道工程学报》2017年05期

【摘要】：研究目的:西南山区隧道进出口段往往位于沟谷,地形切割强烈,洞口仰坡易发生崩塌落石灾害。为评价落石灾害风险,本文建立新的隧道洞口段危岩落石风险的综合评估流程以及多指标综合评估模型,克服以往确定指标权重时人为因素影响较大的缺陷,为今后隧道洞口坡段落石灾害治理决策、落石计算和防治工程等设定风险等级提供依据。研究结论:(1)将可拓学理论引入隧道洞口危岩落石风险评估中,建立了隧道洞口危岩落石风险的可拓综合评估流程,构建了落石风险的多指标可拓综合评估模型;(2)对定性指标做定量化处理并对评价指标进行归一化处理,使得评估指标具有可比性,并提出用简单关联函数确定各指标权重;(3)构建了隧道洞口危岩落石风险分级的物元可拓模型,将落石风险等级定为极低风险(Ⅰ)、低风险(Ⅱ)、中等风险(Ⅲ)、高风险(Ⅳ)与极高风险(Ⅴ)五类,通过工程实例验证并利用层次分析-模糊数学综合评价法进行对比,验证了该评价模型的评估结果是合理的、可行的;(4)本研究结果可为落石风险评估提供一种新的思路。
[Abstract]:Research purpose: the entrance and exit section of tunnel in southwest mountainous area is often located in the gully, the terrain is cut strongly, and the collapse and falling rock is easy to occur on the upside-slope of the entrance of the cave, in order to evaluate the risk of the rock fall disaster, In this paper, a new comprehensive evaluation process and a multi-index comprehensive evaluation model for the risk of rock fall from dangerous rock in the tunnel entrance section are established, which overcomes the defects of human factors in determining the weight of the index in the past, and it is a decision for the future control of the rock disaster in the section of the tunnel entrance slope. The research conclusion is that the extension theory is introduced into the risk assessment of the dangerous rock falling in the tunnel entrance, and the extension comprehensive evaluation process of the risk of the dangerous rock falling in the tunnel entrance is established. In this paper, a multi-index extension comprehensive evaluation model of rock fall risk is constructed. The qualitative index is treated quantitatively and the evaluation index is normalized, which makes the evaluation index comparable. A matter-element extension model for risk classification of dangerous rock falling in tunnel mouth is established by using simple correlation function to determine the weight of each index. The grade of rock falling risk is classified into five categories: very low risk (鈪，

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