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滑坡致灾因子的选取和定量化研究是滑坡危险性分级评价的关键技术。滑坡危险性分级评价因子包括共性因子和非共性因子,共性因子在评价中定量化指标具有一致性,不能反映在滑坡个体评价体系中的差异。根据万州滑坡监测预警资料,选取了地层倾角、坡度、高差和滑坡长度与宽度的比值4个非共性因子作为滑坡危险性分级评价因子,运用Lognormal分布模型,建立了评价因子的定量化评价指标。根据建立的5级评价指标体系对万州滑坡资料进行了验证,中危险性以上的滑坡占滑坡总数的95.8%,其中高危险性和极高危险性占74.1%。研究结果表明,该研究方法的评价因子可靠性好,易于测量和获取,可应用于区域滑坡群策群防灾害点的危险性分级评价和滑坡危险性区划。
Landslide hazard selection and quantitative research is the key technology of landslide hazard classification. Landslide classification risk factors include common factors and non-common factors, common factors in the evaluation of quantitative indicators are consistent, can not reflect the difference in the landslide individual evaluation system. According to the monitoring and warning data of Wanzhou landslide, four non-common factors of strata dip, slope, height difference and the ratio of landslide length and width were chosen as the grading evaluation factors of landslide hazard. The Lognormal distribution model was used to establish the quantitative evaluation index . According to the established 5-level evaluation index system, the landslide data of Wanzhou are verified to be 95.8% of the total number of landslides, of which 74.1% are of high-risk and very high-risk. The results show that the evaluation factor of this research method is reliable, easy to measure and obtain, and can be applied to the hazard classification and landslide risk zoning of disaster prevention sites.