羊毛湾水库土坝裂缝产生与成因分析

分析了羊毛湾水库土坝裂缝的产生和发展过程，认为主要是由于大坝右坝段下伏黄土层在正常高水位浸水湿陷所致。黄土结构性在排列和联结两方面具有涵盖其粒度，密度和湿度等对土性影响敏感的功能，所以浸水湿化后结构强度不断丧失产生湿陷变形，而且湿陷变形具有突变性，不连续性及不可逆性等失稳破坏特征，使湿陷性黄土的体弯与剪切变形同时发生，且随着一次又一次正常高水位蓄水使其浸水而变形发展，累积在坝体至坝面出现隐裂缝和显裂缝，针对以上分析和勘察试验研究探讨了对坝体的除险加固措施。

Causes of Yangmaowan Earth Dam Cracks

The causes of Yangmaowan earth dam cracks and the trend of their development are analyzed. It is considered that the immersion induced collapse of the loess layer underlying the right dam body is the main cause. The loess structure is sensitive to some factors, including granularity, density, and moisture, so the weakening of the loess structure after immersion leads to collapse induced deformation of the earth dam. The deformation failure has the characteristics of mutation, discontinuity, and unreversibility, resulting in the simultaneous occurrence of body and shear deformation. The reservoir storage at the normal high water level once and again promotes the dam body deformation, and the accumulation of deformation leads to the implicit and explicit cracks. Based on the above analysis and exploring tests, danger removal and reinforcement measures for the dam body are studied.