基于断裂力学的混凝土坝裂缝灌浆压力计算模型  

CONCRETE DAM CRACK-GROUTING MODEL BASED ON FRACTURE MECHANICS

作　　者：谭力[1] 黄达海[1] 王祥峰[2] 

机构地区：[1]北京航空航天大学交通科学与工程学院,北京100191 [2]三峡大学土木水电学院,湖北宜昌443002

出　　处：《工程力学》2011年第8期215-218,239,共5页Engineering Mechanics

摘　　要：根据大坝工程上对裂缝种类的分类以及经常采用的化学灌浆方法,以某在建高拱坝中出现的几种裂缝为实例,考虑了浆液流动时的沿程阻损及重力影响,建立了基于断裂力学的化学灌浆计算模型。运用权重法,通过积分计算了灌浆时3种模型下的裂缝尖端应力强度因子。在不同的大体积混凝土断裂韧度条件下,对不同缝长及3种裂缝类型进行化学灌浆的容许灌浆压力研究,给出了具体灌浆压力和分段长度的建议。Considering crack patterns in dams and the used grouting method, this paper establishes a calculation model of crack mechanical grouting in concrete dams, which accounts for the on-way resistant, the gravity impact and some actual cracks found in a dam construction project. The stress intensity factors of crack tips of the three different models under grouting are obtained through weight function method and integration.With different fracture toughness of the mass concrete, the allowable mechanical grouting pressures of variable cracks and three crack models are studied. Finally the specific grouting methods for the three cracks are proposed.

关 键 词：混凝土大坝 裂缝灌浆 计算模型 断裂力学 容许压力 权重方法 

分 类 号：TU318[建筑科学—结构工程]