延安地区压实马兰黄土高压固结变形特性  

Deformation characteristics of compacted Malan loess in Yan'an region under high consolidation pressure

作　　者：孔洋[1,2] 阮怀宁[1,2] 黄雪峰 KONG Yang;RUAN Huai-ningl,;HUANG Xue-feng(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China;Jiangsu Research Center for Geoteehnical Engineering Technology, Hohai University, Nanjing, Jiangsu 210098, China;Department of Architectural Engineering, Army Logistical University, Chongqing 401331, China;Chongqing Key Laboratory of Geomechanics and Geoenvironmental Protection, Army Logistical University, Chongqing 401311)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学江苏省岩土工程技术工程研究中心,江苏南京210098 [3]陆军勤务学院建筑工程系,重庆401311 [4]陆军勤务学院岩土力学与地质环境保护重庆市重点实验室,重庆401311

出　　处：《岩土力学》2018年第5期1731-1736,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.51579081;No.51379065);2013年国家科技支撑计划课题(No.2013BAJ06B04)~~

摘　　要：针对典型的Y型狭长沟谷型地貌中的黄土高填方工程做了大量的室内一维高压固结试验。试验结果表明,Gunary模型可较好地表征侧限压缩情况下压实马兰黄土的垂直压应力与垂直压应变的关系,其适用性优于既有且常用的双曲线模型及幂函数形式;基于Guanary模型,利用割线模量法构建的压实马兰黄土地基变形修正公式,可修正考虑上覆荷载变化、含水率变化及压实度变化的地基变形量;割线模量E_(soi)与含水率的倒数1/w符合二次多项式的关系形式,目前普遍使用的割线模量E_(soi)与压实度K的线性关系形式不符合实际情况。研究成果对沟谷型黄土高填方工程填筑方案的设计与施工具有重大的参考价值。To investigate the deformation behavior of loess in the typical ＂Y＂ shape long and narrow gully landforms, a series of one-dimensional consolidation tests are carried out indoor under high-pressure conditions. Test results show that the Gunary Model is better than the hyperbolic model or the exponential function to represent the relation between vertical compressive stress and vertical compressive strain of compacted Malan loess. Using secant modulus, the modified formulas of deformation of foundation with compacted Malan loess are constructed to calculate the deformation considering the variation of loading, water content and compactness. The relation of secant modulus Esoi and the reciprocal of water content 1 / w is in the form of quadratic polynomial. The widely used linear relation formula of secant modulus Esoi and compactness K is not consistent with the actual situation. Research results have an important reference value to the design and construction of gully type high loess-content landfill projects.

关 键 词：黄土高填方 压实马兰黄土 变形特性 Gunary模型 地基沉降量 

分 类 号：TU411[建筑科学—岩土工程]