房山周口店车厂北沟泥石流特征及防治

摘要

Debris lfow is one of serious geological disasters in Beijing area. As the most serious disaster, “7•21”lfash lfood made Fangshan District to be as the serious disaster area. In order to ifnd out the development and movement characteristics of typical debris lfow in Fangshan District after“7•21”lfash lfood, this paper selects Chechangbeigou debris flow as an example, and does researches such as on-site investigation, trenching, rock and soil testing method. We ifnd out the provenance type formation area and mobile source reserves; grasp the characteristics of the channel shape of the whole basin; investigate the morphology and accumulation area, discuss main water dynamic characteristics and erosion characteristics. According to the relevant specifications, the dynamic parameters of debris lfow are calculated. The formation mechanism of debris lfow are analyzed, then the risk assessment and the countermeasures are put forward.%泥石流是北京地区危害性严重的地质灾害之一，作为北京“7·21”特大暴雨灾害受灾最为严重的区县，房山区近现代泥石流一直比较活跃，灾情严重。为了查清房山区“7·21”特大暴雨后典型泥石流灾害发育和运动特征，本文选取了车厂村北沟作为样本，通过采用现场调查、槽探、岩土测试等方法，对主沟整体流域进行了系统研究。从而查清了形成区的物源类型和可移动物源储量，掌握了全流域的沟道形态特征；通过对堆积区堆积形态和堆积物调查分析，论述了主沟水动力特征和冲淤特征；根据相关规范，计算得出了泥石流的动力学参数。分析了泥石流形成机理，进行了危险性评价，提出了防治对策。