某滑坡稳定性分析评价

2017-07-10 03:15:30李雯瑜康乐
价值工程 2017年20期

李雯瑜+康乐

摘要:通过现场勘察并在分析该滑坡特征及成因等的基础上,利用传递系数法和推力法简化方程式计算滑坡的稳定性。结果表明该滑坡近期在雨季处于不稳定状态,旱季表层土体处于欠稳定状态,而地震时处于不稳定状态。根据稳定分析及推力计算,滑坡区为整体滑移区,在确保治理工程的经济合理性和安全性的前提下,采取防治措施,防止其再次扩大范围,减少损失,确保居民安全。

Abstract: Based on the field investigation and analysis of the characteristics and origin of the landslide, the stability of the landslide is calculated by using the transfer coefficient method and the simplified method of thrust. The results show that the landslide area is unstable in the rainy season, the surface soil in the dry season is in an unstable state, and the earthquake is in an unstable state. According to the stability analysis and thrust calculation, the landslide area is the whole slip zone. Under the premise of ensuring the economic rationality and safety of the control project, the prevention and control measures should be taken to prevent it from expanding again, reducing the loss and ensuring the safety of the residents.

關键词:滑坡;发育特征;稳定性评价;治理研究

Key words: landslide;developmental characteristics;estimation of stability;governance research

中图分类号:TU94+3.2 文献标识码:A 文章编号:1006-4311(2017)20-0078-03

1 工程概况

该滑坡点,出现短时强降水天气(降雨量达80毫米,局部100毫米),于2016年9月16日出现前缘剪出、开裂迹象,水泥路面开裂,边坡滑坡,滑体上房屋拉裂,2016年雨季到来,变形范围向后扩大,直接威胁到坡下住民小组26户住房,65人的生命财产安全。经过现场踏勘,该滑坡有扩大的趋势,还将威胁到乡村道路约200m及居民土地9000m2,威胁资产达到460万,住家人数约65人及过往行人、车辆。情况十分紧急,又正是雨季,对其进行应急治理十分必要。

滑坡总体地形坡度15~26°,滑体上分布有一栋房,及旱耕地,耕地边呈陡坎,一般45°-70°,前沿为修建乡村公路后形成陡坎,前沿变陡,陡坎高1~10.5m,目前在前沿陡坎上可见滑体剪出迹象和公路路面裂缝。第四系松散层厚度0.5~6.6m,斜坡总体不稳定,已形成滑动,后沿目前裂缝已被村民采用人工填实,防治雨水直接从裂缝渗入。滑体平均厚度约5m,长平均约110m,宽平均约70m,滑体方量预计38500m3左右,其滑动范围较小。……

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