节理化岩质边坡稳定性分析的模糊测度法

发布时间：2018-04-30 03:00

本文选题：边坡稳定性 + 模糊测度　；参考：《河北大学》2015年硕士论文

【摘要】：节理化岩质边坡稳定性分析向来是岩土工程领域内重要研究课题之一。由于在分析过程中涉及到大量的工程参数,如岩体内聚力、内摩擦角等参数值难以精确测定而存在客观的模糊性,从而为边坡稳定性分析带来许多困扰。为此,本文采用模糊测度理论模型对此类问题进行分析。在分析过程中,本文以我国江南某大型露天矿山为例,对其边坡稳定性进行了具体的计算分析。首先,利用模糊测度模型分析了在爆破动力影响下边坡失稳的可能性。模糊概率,即考虑在不同最大一段起爆药量的条件下,边坡岩体失稳程度。在分析过程中,针对工程参数确定问题,采用了人工神经网络方法确定了与爆破动力有关的参数及与岩石性质有关参数。同时,采用经典的简化Bishop法及有限单元法对边坡的稳定性进行了分析,并与模糊测度分析结果进行对比分析。由分析结果可知,三种分析方法所得结果与实际工程情况一致;一方面,有限元数值模拟结果与模糊测度法的预测结果相吻合;另一方面,模糊测度法不仅可以将诸多影响边坡稳定性的因素的“模糊性”可虑其中,还可以得出节理化边坡失稳的破坏程度,进而比经典分析方法更符合于工程实际。此外,应用模糊测度法对节理化岩质边坡进行稳定性分析时,可以获得距边坡不同距离,爆破震动对边坡稳定性的影响程度。以此来评价生产爆破中所采用的炸药量是否合理,进而达到控制爆破的目的,提高爆破效果的同时,也确保了边坡的稳定性及安全生产。综合分析结果表明,本文采用的模糊测测度理论模型及分析方法对节理裂隙发育或风化破碎的岩质边坡较为适用。
[Abstract]:The stability analysis of rock slope has always been one of the important research topics in geotechnical engineering field. Because a large number of engineering parameters, such as cohesion of rock mass and angle of internal friction, are difficult to be accurately measured in the process of analysis, there is an objective fuzziness, which brings many problems to the stability analysis of slope. Therefore, the fuzzy measure theory model is used to analyze this kind of problems. In this paper, a large open pit mine in the south of the Yangtze River is taken as an example to calculate and analyze the slope stability. Firstly, the possibility of slope instability under the influence of blasting dynamics is analyzed by using fuzzy measure model. Fuzzy probability, that is, considering the slope rock mass instability degree under the condition of different maximum initial explosive charge. In the process of analysis, the artificial neural network method is used to determine the parameters related to blasting dynamics and rock properties in view of the problem of engineering parameter determination. At the same time, the classical simplified Bishop method and finite element method are used to analyze the slope stability, and the results are compared with the results of fuzzy measure analysis. From the analysis results, we can see that the results obtained by the three methods are consistent with the actual engineering situation. On the one hand, the results of the finite element numerical simulation are consistent with the results of the fuzzy measure method; on the other hand, The fuzzy measure method can not only take into account the fuzziness of many factors affecting slope stability, but also obtain the failure degree of the unsteady slope, which is more suitable for engineering practice than the classical analysis method. In addition, when using fuzzy measure method to analyze the stability of rock slope, the influence degree of blasting vibration on slope stability can be obtained at different distance from the slope. In order to evaluate whether the quantity of explosive used in production blasting is reasonable or not, the purpose of controlling blasting is achieved, and the effect of blasting is improved, and the stability and safety of the slope are ensured at the same time. The comprehensive analysis results show that the fuzzy measurement theory model and the analytical method used in this paper are more suitable for rock slope with jointed fractures developed or weathered and broken.
【学位授予单位】：河北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU457

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