兰州市伏龙坪、华林坪地质灾害分布特征及形成机制分析

ANALYSIS OF CHARACTERISTICS AND FORMATION MECHANISM ABOUT GEOLOGICAL HAZARDS IN FULONGPING AND HUALINPING IN LANZHOU

兰州市是我国地质灾害最为严重的省会城市之一,而位于城区南部的伏龙坪、华林坪地区已成为兰州市主要的地质灾害易发区,根据最新调查结果表明,区内发育有滑坡43处,崩塌8处,不稳定斜坡68处,泥石流沟7条。已造成7人死亡,9人受伤,直接经济损失近800万元,潜在威胁近5764人、资产约29112万元。发生滑坡的斜坡体基本上均由黄土组成,坡高一般30～50m、坡度一般40°～60°,而且这些斜坡地带居住了许多居民,坡肩和坡脚削坡建房,修路等形成了临空面,为滑坡的形成提供良好的临空条件,并且斜坡上无序堆放垃圾、倾倒污水,在降水的诱发下,促使滑坡、崩塌发生。所以,对伏龙坪、华林坪地区地质灾害治理已是迫在眉睫,刻不容缓。

Lanzhou is one of the capital cities in our country, which suffered the geological hazard seriously. Fulongping and Hualinping located in the south of Lanzhou city has been becoming the main geological-hazard- prone area of the city. According to the latest investigation results, there are 43 landslides, 8 collapses, 68 unstable slopes and 7 debris flow gullies in this area. It has caused made 7 people died, and 9 injured. It also made direct economic loss about 8 million Yuan. And about 5 764 people and 29 112 million Yuan＇s assets are in danger. The slope body that landslide took place is mainly composed of loess. The slope height is about 30-50m and the gradient is about 400-60~. What is more, a lot of residents are living there. They built their houses by cutting slope in the slope shoulder and back-slope. And also because of repairing of road, it makes many air faces there. All of these above provide good air free conditions to the forming of landslide. Even more the residents throw garbage and dump sewage at the slope promiscuously. When the rain come, the landslides and collapses may take place. So it is the high time to control geological hazard in Fulongping and Hualinping areas.