摘要
黄土地基遇水湿陷后具有不均匀沉降特征,对修建于其上的预制管廊结构会产生不可避免的危害.地基湿陷使得预制管廊结构可能出现开裂、错台、扭转甚至廊体坍塌,影响预制管廊工程的安全运营.针对这一现象,本文通过不同配比配制四种不同湿陷性的人工黄土,经过试验后得到与原状黄土湿陷性相似的配比.并将其作为试验用土,开展湿陷性黄土地基对预制管廊结构受力性能影响的研究工作.研究表明,人工配制湿陷性黄土能够较好的模拟原状黄土特殊性质,在管廊受力方面,相较于顶底板横向应变,基底全幅浸水对于管廊前、后侧板应变影响幅度较小;浸水湿陷过程中会打破管廊与周围土体原有的受力平衡状态,引起应力重分布现象,且顶板和底板极易发生受拉破坏;在黄土地基发生不均匀沉降后,预制管廊结构会呈受弯、受扭状态.
The loess foundation has the characteristics of uneven settlement after collapsing in water,which will inevitably cause harm to the prefabricated pipe gallery structure built on it.The foundation collapsibility may cause cracking,dislocation,torsion and even collapse of the prefabricated pipe gallery structure,which affects the safe operation of the prefabricated pipe gallery project.In view of this phenomenon,four kinds of artificial loess with different collapsibility are prepared by different proportions in this study,and the ratio similar to the collapsibility of the original loess is obtained after the test,and it is used as the test soil to carry out the research on the influence of collapsible loess foundation on the mechanical performance of prefabricated pipe gallery structure.The results shows that the artificially prepared collapsible loess can better simulate the special properties of the original loess.In terms of the stress of the pipe gallery,compared with the lateral strain of the top and bottom plates,the full-width immersion of the base has less influence on the strain of the front and rear side plates of the pipe gallery.In the process of water immersion and collapsibility,the original stress balance between the pipe gallery and the surrounding soil will be broken,causing stress redistribution,and the top and bottom plates are prone to tensile failure.After the uneven settlement of the loess foundation,the prefabricated pipe gallery structure will be bent and twisted.
作者
董志磊
刘辉
李鑫
邓博团
DONG Zhilei;LIU Hui;LI Xin;DENG Botuan(Henan Road and Bridge Construction Group Co.,Ltd,Shangqiu 476000,China;School of Architecture and Civil Engineering,Xi′an University of Science and Technology,Xi′an 710054,China;The First Company of China Construction Sixth Engineering Bureau Corp.,Ltd,Xi′an 710000,China)
出处
《西安建筑科技大学学报（自然科学版）》
北大核心
2023年第5期704-711,共8页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
国家自然科学基金(42177155)。
关键词
湿陷性黄土
预制管廊
浸水湿陷
受力特性
collapsible loess
prefabricated pipe gallery
submerged in water
mechanical properties
