期刊信息
主管单位:教育部
主办单位:重庆大学
主  编:刘汉龙
地  址:重庆市沙坪坝区沙正街174号 重庆大学期刊社 《土木与环境工程学报》编辑部
邮政编码:400044
电  话:023-65111322;023-65111863
电子邮件:xuebao@cqu.edu.cn
国际标准刊号:ISSN 2096-6717
国内统一刊号:CN 50-1218/TU
邮发代号:78-48
每期定价:¥20
全年定价:¥120
访问统计
  • 您是本站第3424923位读者
  • 今日访问815
引用本文:
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  下载PDF阅读器  关闭
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 156次   下载 54 本文二维码信息
码上扫一扫!
分享到: 微信 更多
冻融循环作用下尾矿坝的力学响应特征
金佳旭1, 李世旺1, 梁冰2, 张二军3, 张平怡1
1.辽宁工程技术大学 土木工程学院, 辽宁 阜新 123000;2.辽宁工程技术大学 力学与工程学院, 辽宁 阜新 123000;3.辽宁工程技术大学 机械工程学院, 辽宁 阜新 123000
摘要:
寒区冻融环境条件下,尾矿砂的冻融、缩胀、损伤破坏给寒区尾矿坝工程造成极大的危害。为探究冻融循环作用下尾矿坝变形规律,揭示其变形机制。采用自主设计的尾矿坝相似模型试验装置,开展不同冻结温度(-5、-25、-45℃)条件下,尾矿坝的变形规律模型试验。借助土压力、激光位移、孔隙水压力传感器,采用动态数据采集仪采集相关数据,分析冻融循环过程中尾矿坝各关键位置应力、变形、孔隙水压力的动态变化规律。试验结果表明:坝体内应力随冻结温度的降低而增大,在冻融循环前期,尾矿坝各关键位置应力增长速度明显高于冻融循环其他阶段。坝体内孔隙水压力随冻结温度的降低而减小,坝体越深,孔隙水压力的变化幅度越大,周期性更强,也更具有规律性。冻结温度具有明显的位置效应,越靠近尾矿坝边缘,坝体变形量越大,变形速度越快。
关键词:  岩土工程  尾矿坝  冻融循环  力学响应特性  变形机制
DOI:10.11835/j.issn.2096-6717.2019.067
分类号:TU431
基金项目:国家自然科学基金(51504123);辽宁省自然科学基金(20170540417);辽宁省教育厅一般项目(LJYL029)
Study on mechanical response characteristics of tailings dam under freezing thawing cycle
Jin Jiaxu1, Li Shiwang1, Liang Bing2, Zhang Erjun3, Zhang Pingyi1
1.School of Civil Engineering, Liaoning University of Engineering and Technology, Fuxin 123000, Liaoning, P. R. China;2.School of Mechanics and Engineering, Liaoning University of Engineering and Technology, Fuxin 123000, Liaoning, P. R. China;3.School of Mechanical Engineering, Liaoning University of Engineering and Technology, Fuxin 123000, Liaoning, P. R. China
Abstract:
The freezing and thawing, shrinkage and expansion, and damage of tailings sand can cause great harm to the project of tailing dam in cold regions. In order to explore the deformation characteristics of tailing dam and reveal its deformation mechanism under freeze-thawing, down-scale tailings dam model tests were carried out on a self-designed device under different freezing temperatures (-5, -25, -45℃). The soil pressure, displacement and pore water pressure at each key position of tailing dam during the freeze-thaw cycle were measured by the dynamic data acquisition instrument. The test results show that:the internal stress of the dam increases with decrease of freezing temperature; the stress growth rate in the early stage of freeze-thaw cycleat each key position is higher than that at the other stages. The pore water pressure in the dam decreases with decrease of freezing temperature. The variation range, periodicity and regularity of pore pressure increases with the position depth of the dam. Besides, it is revealed that the freezing temperature has obvious position effect. The closer to the tailings dam edge, the greater the deformation magnifude of dam body and the higher of the deformation rate.
Key words:  geotechnical engineering  tailings dam  freeze-thaw cycle  mechanical response characteristics  deformation mechanism
Copyright@ 2008 All Rights Reserved.
关注微信二维码