摘要
利用数值模拟方法分析粉煤灰修筑高等级混凝土路面裂缝损伤特性。制备粉煤灰质量分数分别为25%、35%、45%的试件1、试件2、试件3,将3种试件的参数输入到FLAC3D软件开展数值模拟,计算裂缝损伤演化及变量,获得粉煤灰修筑高等级混凝土路面裂缝损伤特性。数值模拟结果显示:粒径较小的超细粉煤灰能够延长初裂时间,产生的裂缝面积也更小,粉煤灰质量分数为35%的试件2裂缝面积最小,初裂时间最长,经过冻融循环及干湿循环处理后裂缝损伤度较小,且应变较大情况下仍旧能够保持较小裂缝损伤度;试件1和试件3的裂缝面积较大,初裂时间较短,受到冻融循环与干湿循环影响时裂缝损伤度较高,说明受到荷载影响,出现严重裂缝损伤。
The numerical simulation method was used to analyze the crack damage characteristics of high-grade concrete pavement constructed with fly ash.Specimens 1,2 and 3 were prepared with fly ash mass fractions of 25%,35%and 45%respectively.Inputting the parameters of these three specimens into the FLAC3D software for the numerical simulation,the evolution and variables of the crack damage were calculated to get the crack damage characteristics of high-grade concrete pavement constructed with fly ash.The numerical simulation results showed that ultrafine fly ash with smaller particle size could lengthen the initial crack time and reduce the crack area,and specimen 2 with a fly ash mass fraction of 35%had the smallest crack area and longest initial crack time.After freeze-thaw cycles and dry-wet cycles,the crack damage degree was relatively small,and the small crack damage degree could still be maintained under high strain conditions.The crack area of specimens 1 and 3 was relatively large,with a shorter initial crack time.When subjected to freeze-thaw cycles and dry-wet cycles,the degree of crack damage was relatively high,indicating that severe crack damage characteristics occurred under the influence of loads.
作者
陈茂
晏明友
祝李京
Chen Mao;Yan Mingyou;Zhu Lijing(CCTEB Infrastructure Construction Investment Co.,Ltd.,Wuhan Hubei 435000,China;Wuhan Huazhong University of Science and Technology Testing Technology Co.,Ltd.,Wuhan Hubei 430074,China)
出处
《煤化工》
CAS
2023年第5期116-120,共5页
Coal Chemical Industry
基金
国家自然科学基金委员会面上项目(51778262)。
