压实黄土高压力下湿陷变形特性试验研究  

Experimental study on the deformation characteristics of compacted loess under high pressure

作　　者：王寒 黄雪峰[1,2,3] 邱明明 王博 WANG Han;HUANG Xuefeng;QIU Mingming;WANG Bo(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Department of Military Facilities Engineering,Army Service College,Chongqing 401311,China;School of Architectural Engineering,Yan′an University,Yan′an 716000,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]重庆交通大学河海学院,重庆400074 [3]陆军勤务学院军事设施工程系,重庆401311 [4]延安大学建筑工程学院,陕西延安716000

出　　处：《自然灾害学报》2023年第1期122-130,共9页Journal of Natural Disasters

摘　　要：高压力下压实黄土的湿陷变形特性是高填方黄土工程变形控制的关键问题。为研究高压力下压实黄土物理性质对变形特性的影响规律,建立高压力下湿陷系数与物理力学指标间的多元回归方程,开展了不同压力、含水率、压实度的黄土压缩试验。研究结果表明:在高压力下,压实黄土湿陷变形特性与初始含水率、压实度密切相关,低含水率压实黄土湿陷性显著,高含水率压实黄土湿陷变形较小,低压实度黄土具有湿陷性,压实度达到90%以上不会发生湿陷;高压力下黄土孔隙比越小湿陷终止压力越大,高填方体黄土湿陷性评价应考虑饱和自重压力及上覆荷载变化引起湿陷性的变化,建立的湿陷系数回归方程相关性良好。研究成果可为黄土地区高填方工程实践理论研究提供参考。The collapsibility and deformation characteristics of compacted loess under high pressure are the key issues in engineering deformation control of high-fill loess.In order to study the influence of the physical properties of compacted loess on the deformation characteristics under high pressure,the multiple regression equation between the collapsibility coefficient and the physical and mechanical indexes under high pressure was established,and loess compression tests with different pressures,moisture contents and compaction degrees were carried out.The research results show that:under high pressure,the collapse deformation characteristics of compacted loess are closely related to the initial moisture content and compaction degree.Low compaction loess has collapsibility,and no collapsibility will occur when the compaction degree reaches more than 90%;under high pressure,the smaller the void ratio of loess,the greater the collapse termination pressure,and the evaluation of the collapsibility of high-fill loess should consider saturation.The change of the collapsibility caused by the change of self-weight pressure and overlying load,and the established collapsible coefficient regression equation has good correlation.The research results can provide a reference for the theoretical research of high fill engineering practice in loess areas.

关 键 词：湿陷性黄土 高压力 含水率 压实度 回归方程 

分 类 号：TU44[建筑科学—岩土工程] X43[建筑科学—土工工程]