ISSN 1003-8035 CN 11-2852/P

    吕梁山区黄土物理性质力学参数区域分布特征

    Distributive characteristics of physical and mechaniscal parameters of the loess soils in Lüliang mountainous area

    • 摘要: 黄土因其特殊的物理力学性质及工程特性,在外界环境影响下易引发诸如黄土崩塌、滑坡、泥流等地质灾害。因此,研究黄土土性参数区域性分布特征对地质灾害防灾减灾具有重要意义。以吕梁山区L1黄土地层为研究对象,在野外调查、代表性点位取样的基础上,对研究区内133个取样点340组黄土试样进行黄土土性参数室内试验,获得其土性参数;基于所得数据,通过统计分析及ArcGIS软件平台,分析研究区内L1黄土地层土性参数分布特征。结果表明:黏粒含量、天然含水率、孔隙比、黏聚力、内摩擦角的分布在南北方向上具有较好的规律性,山脉东西两侧规律略有不同。另外,黏粒含量、天然含水率、黏聚力、湿陷系数的区域分布规律较为明显,内摩擦角区域分布上较为离散。研究结果为从土性特征方面对地质灾害易发性评价提供基础数据支撑。

       

      Abstract: Loess is prone to geological hazards such as landslide, spalling and mud flow due to its special physical and mechanical properties and engineering characteristics. Therefore, it is of great significance to study regional distributive characteristics of loess parameters for geological hazard prevention and mitigation. The L1 loess stratum in Lüliang Mountains is taken as the research object. Based on field investigation and sampling at representative points, the soil properties of 340 groups of loess samples from 133 sites in the study area were tested in laboratory. Based on the obtained data, the distributive characteristics rules of soil properties of L1 loess strata in the study area were analyzed by statistical analysis and ArcGIS software platform. The results show that the distribution of clay content, natural water content, pore ratio, cohesion and internal friction angle have good regularity in north-south direction, but the regularities are slightly different between the eastern and western of the mountains. In addition, the regional distributive characteristics law of clay content, natural water content, cohesion and collapsibility coefficient is obvious. However, the internal friction angle is relatively discrete in regional distribution. The research results provide basic data for the evaluation of geological hazard susceptibility from the perspective of soil characteristics.

       

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