| 短龄期城市固体垃圾直剪试验及应力位移模型 |
| |
| 引用本文： | 王伟,金鹏,张芳.短龄期城市固体垃圾直剪试验及应力位移模型[J].岩土力学,2011,32(Z1):166-170. |
| |
| 作者姓名： | 王伟 金鹏 张芳 |
| |
| 作者单位： | 绍兴文理学院 土木工程系，浙江 绍兴 312000 |
| |
| 摘 要： | 城市固体垃圾（MSW）的力学行为是环境岩土工程研究中的一个主要课题。进行了1、4、7 d共3组短龄期的MSW试验室直剪试验，每组试验分别考虑3种不同密度。试验结果表明，MSW试样的直剪破坏仍遵循摩尔-库仑破坏准则。密度较大试样的抗剪强度在1～7 d龄期内持续增长；密度较小试样的抗剪强度在1～4 d龄期内增长，在4～7 d龄期内降低。MSW试样的摩擦角随龄期的发展单调增加，但黏聚力随龄期先增大而后减小。分析了传统剪应力-位移模型的不足，提出了一个新的复合正切-指数曲线模型，该模型具有良好的数学性质，较传统模型有更广泛的适用性。试验数据拟合表明，新模型能很好地描述MSW的剪应力-位移过程，相关系数均大于0.99。其结果可供相关填埋场设计及工程数值分析参考
|
| 关 键 词： | 城市固体垃圾 抗剪强度 应力位移曲线 数学模型 |
| 收稿时间： | 2010-12-27 |
Direct shear test of short-fill-age municipal solid wastes and its shear stress-deformation model |
| |
| WANG Wei,JIN Peng,ZHANG Fang.Direct shear test of short-fill-age municipal solid wastes and its shear stress-deformation model[J].Rock and Soil Mechanics,2011,32(Z1):166-170. |
| |
| Authors: | WANG Wei JIN Peng ZHANG Fang |
| |
| Institution: | Department of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China |
| |
| Abstract: | Mechanical behavior of municipal solid waste (MSW) is important to geoenvironmental engineering; and it is necessary to understand it properly. Laboratory direct shear tests are conducted on MSW with 3 short fill ages, namely 1 d, 4 d and 7 d. Three different densities are taken into accounted in each fill age. Experimental data show that MSW’s shear failure still satisfies the Mohr-Coulomb criterion. As to bigger density, shear strength of MSW increases within 1-7 d fill age. When density becomes smaller, its shear strength increases within 1-4 d fill age but decreases within 4-7 d fill age. With fill-age developing, friction angle of MSW increase monotonously, but cohesion force of it first increases and then decreases. On the other hand, shortcomings of traditional shear stress-displacement model are analyzed; and one composite tangent- exponential model is proposed. The proposed model has good mathematical behaviors and more applicability than traditional models. Experimental data show that it can well describe MSW’s stress-displacement curve with correlation coefficient bigger than 0.99. This research results are helpful for design and numerical simulation of corresponding MSW landfill |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
