山口岩拱坝裂缝灌浆前后整体安全度评价

Global safety evaluation of Shankouyan arch dam before and after crack grouting

山口岩拱坝在施工期间和蓄水初期,坝体出现多条裂缝,拱坝开裂将对结构安全带来危害。裂缝发生后,施工单位对其进行了化学灌浆处理。本文在采用混合模型反演裂缝灌浆前后坝体综合弹性模量和基岩变形模量的基础上,采用水容重超载法和建基面塑性屈服区贯通准则对山口岩拱坝裂缝灌浆前后的整体安全度进行分析。结果表明裂缝灌浆前,当水容重超载系数为6.0时,建基面出现塑性屈服区贯通现象;裂缝灌浆后,当水容重超载系数为7.0时,建基面出现塑性屈服区贯通现象。裂缝灌浆后拱坝整体安全度比裂缝灌浆前有一定程度的增大。

During dam construction and initial impoundment of Shankouyan arch dam,many cracks appeared in the dam body,and arch dam cracking will bring harm to structure safety.After the crack occurred,the construction company carried out chemical grouting treatment.In this paper,based on the inversion of comprehensive elastic modulus and deformation modulus of rock mass before and after crack grouting by using mixed model,the global safety degree of Shankouyan arch dam before and after crack grouting is analyzed by using the method of overload water bulk density and breakthrough criterion of plastic yield zone of foundation surface.The results show that before the crack grouting,when the water bulk density overload coefficient is 6.0,the plastic yield zone of the foundation surface is connected;after the crack grouting,when the water bulk density overload coefficient is 7.0,the plastic yield zone of the foundation surface is connected.The global safety degree of arch dam after crack grouting is increased to a certain extent compared with that before crack grouting.