考虑劣化屈服老化裂纹后混凝土水库堤坝排水边坡抗震性研究  

Seismic Behavior of Drained Slopes on Concrete Reservoir Dams Considering Degradation Yield and Aging Cracks

作　　者：石晶[1] 李伟[2] SHI Jing;LI Wei(Changzhi Vocational and Technology College,Changzhi 046000,Shanxi,China;Shanxi University,Taiyuan 030013,Shanxi,China)

机构地区：[1]长治职业技术学院,山西长治046000 [2]山西大学,山西太原030013

出　　处：《地震工程学报》2019年第6期1506-1513,共8页China Earthquake Engineering Journal

基　　金：国家自然科学基金项目(81102833)

摘　　要：针对在水库堤坝排水边坡混凝土裂纹的抗震性研究中,未考虑岩土体抗剪强度参数的劣化屈服效应以及混凝土裂纹的老化,存在抗震性判断结果准确率较差等问题,提出水库堤坝排水边坡混凝土考虑老化后产生裂纹的抗震性能研究方法。模拟强震下边坡混凝土的开裂破坏过程,根据D-P屈服准则,实现对闸墩混凝土材料的屈服判断。采用薄层整体单元模拟和分离式裂纹单元,实现混凝土裂纹的数值模拟,加载地震波后,获取混凝土裂纹的强震响应规律与破坏特征。实验结果可知,本文方法对坝体位移变化的研究精度高,得到的混凝土裂纹扩展范围更为准。运用本文方法对水库堤坝排水边坡混凝土的抗震性研究准确率以及可信度较高,说明本文方法具有一定的可取性。In the study of the seismic behavior of concrete cracks in drained slopes on reservoir dams,neither the degradation yield effect of shear strength parameters of rock and soil nor the aging of concrete cracks are considered.This compromises the accuracy of the results of seismic evaluation.Therefore,a method of analysis of the seismic performance of drained slopes on reservoir dams,incorporating concrete cracks,was proposed in this paper.The cracking and failure process of slope concrete under a strong earthquake was simulated,and a judgment of the concrete material yield of the gate pier,according to D-P yield criteria,was made.The thin-layer integral element and separated crack element were used to simulate the concrete crack.After loading the seismic wave,the response and failure characteristics of the concrete cracks under a strong earthquake were obtained.Results showed that the method presented in this paper was highly accurate in studying the displacement change in a dam body;the crack propagation range of concrete obtained was also accurate,indicating the utility of the proposed method.

关 键 词：水库堤坝 排水边坡 混凝土裂纹 抗震性研究 本构模型 屈服准则 

分 类 号：TU652[建筑科学—建筑技术科学]