闽北地区边坡崩塌的成因机制分析与治理措施

Mechanism and Mitigation Measures of Landslides in Northern Fujian Province

针对闽北地区某处边坡崩塌的地质灾害,分析了崩塌的破坏模式与形成机制,进行边坡稳定性分析,提出了针对性的综合治理措施。研究表明该区的崩塌破坏模式以小型的滑移式崩塌与滑塌为主,崩塌是由工程性质较差的边坡岩土体、山间凹地的地形地貌、频降雨与突降暴雨的天气和未加保护的人工开挖活动共同作用引起的,降雨会显著降低边坡的稳定性。建议坡面采用锚杆(索)加框架梁支护,崩塌严重区采用重力式挡墙支护的支挡措施,坡顶、坡脚设置截(排)水沟,坡面设置泄水孔,完善坡体排水的截面排水措施。研究成果可为闽北地区风化岩土边坡崩塌灾害防治提供一定的科学依据和参考。

Based on the investigation of the geological hazards a slope failure in the north of Fujian Province is systematically evaluated in this paper. The failure mode, formation mechanism as well as the slope stability aspect has been analyzed. Also presented in the paper are some practical and pertinent failure countermeasures. The investigation indicates that the failure of the studied slope is the result of small-scale sliding mode and shallow landslide. In addition, the rock and soil slope bodies, topography of the inter-mountain depression, rainy and stormy climate as well as the human activities(such as excavation) with no support system also play important roles. Specifically, the stability of the slope would decrease remarkably due to the rainfall. The proposed mitigation measures of supporting slope surface by the ground anchor and the frame beam, applying gravity retaining wall for the support in severe collapse area as well as providing the drainage ditch(at the top and the bottom of the slope) and the drainage weep holes(on the slope surface) for the drainage improvement could effectively minimize the landslide related hazards. This paper provides the understanding of the formation mechanism of the geo-hazard of collapse and technical guidance to prevent landslides in the northern Fujian Province.