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黄土斜坡失稳滑动是黄土地区主要的地质灾害之一,严重影响当地居民的日常生活和各项工程建设的顺利进行。文中以陕北高原练家沟黄土斜坡为研究对象,采用现场调绘和地质勘察的方法确定了滑坡的形态和范围,根据滑坡所处位置的地貌特征、地层岩性以及边界特征等对斜坡失稳的形成机制进行了分析。研究表明:坡脚削坡建房、坡顶行车振动荷载以及降雨的影响,是造成斜坡裂缝开展和整体稳定性降低的主要原因。在此基础上选取斜坡的典型剖面,利用原位和室内试验确定计算参数,通过不平衡推力传递法及FLAC强度折减法对其稳定性进行评价,并提出处置措施。研究结果可为该地区黄土边坡地质灾害的防治提供参考。
The instability and slippage of the loess slope is one of the major geological disasters in the loess area, which seriously affects the daily life of local residents and the smooth progress of various construction projects. Taking Lianjiagou loess slopes in northern Shaanxi as an example, the shape and scope of the landslides were determined by on-site reconnaissance and geological survey. According to the geomorphic features, lithology and boundary features of landslides, The mechanism of stable formation was analyzed. The research shows that the main reason for the slope crack initiation and overall stability reduction is that the construction of hillside slope, the vibration load of the hilltop driving and the rainfall are the main reasons. On this basis, the typical section of slope is selected, the parameters are determined by in-situ and in-house tests, the stability is evaluated by unbalanced thrust transfer method and FLAC strength reduction method, and the disposal measures are proposed. The results can provide reference for the prevention and treatment of geological disasters on the loess slope in the area.