天水市北山黄土崩塌灾害特征、成因及防治

通过野外调查和分析实验数据,用数理统计法对天水市北山黄土崩塌特征进行了统计分析.通过对研究区黄土崩塌地质灾害的成因的分析,揭示了该区黄土崩塌地质灾害发育的物质基础、力学性质、自然因素和人为因素.结果表明,天水市北山黄土崩塌灾害以中、小型为主,崩落范围为5～15 m；黄土崩塌的坡高集中在15～40m,坡度集中在58°～906；潜在黄土崩塌的坡高集中在10～38m,坡度集中在48°～90°.结果认为天水市北山黄土崩塌的促发因素为降水、泉水、地震和人类活动,提出了黄土崩塌灾害的防治原则及其适宜性措施.研究结果可为进一步治理该区黄土崩塌灾害提供理参考.

Characteristics,Causes and Controlling of Loess Collapses in Beishan Mountain of Tianshui City

By field geo-hazard survey,statistical analysis on the characteristics of loess collapses in the Beishan Mountain of Tianshui City is performed using historical and current experimental data.The analysis anddiscussion on the formation mechanisms of loess collapses in the study area have revealed the material basis,mechanical properties,natural and artificial conditions of loess collapses.Results show that the geo-hazard isdominated by small or middle type of loess collapses,The results indicate that the geo-hazard of loess landslide is concentrated on small or middle type,the height of slope is from 15mto 40mand the gradient slopevaries from 58°to 90°.However,the height of slope assigned to potential loess landslide focuses on the rangefrom 10mto 38m,correspondingly,the gradient slope is from 48°to 90°.The loess collapses in the BeishanMountain were caused by precipitation,springs,earthquakes and human activities.Accordingly,some measures can be suggested for controlling the loess collapses.Results from the study may provide guidance forcontrolling loess collapses in this region in future.