| 饱和黄土液化后强度与变形特性的试验研究 |
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| 引用本文： | 师伟雄,张子东,高和新,涂国祥,张晓超.饱和黄土液化后强度与变形特性的试验研究[J].西北地震学报,2016,38(6):922-928. |
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| 作者姓名： | 师伟雄 张子东 高和新 涂国祥 张晓超 |
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| 作者单位： | 中铁二院西北勘察设计有限责任公司, 甘肃 兰州 730000,成都理工大学 环境与土木工程学院, 四川 成都 610059,成都理工大学 环境与土木工程学院, 四川 成都 610059,成都理工大学 地质灾害防治与地质环境保护国家重点实验室, 四川 成都 610059,成都理工大学 地质灾害防治与地质环境保护国家重点实验室, 四川 成都 610059 |
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| 基金项目： | 中国地调局项目（1212011140005）；国家重点基础研究发展计划项目（2014CB744703） |
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| 摘 要： | 采用MTS810动三轴试验仪,用二氧化碳+脱气水循环渗流法对重塑黄土进行饱和,进行了一系列对石碑塬滑坡区饱和黄土液化后变形特性试验。考虑干密度和初始有效围压对黄土液化后变形特性的影响,将液化与未液化黄土在单调静荷载作用下的应力-应变曲线进行对比。实验结果表明:利用二氧化碳+脱气水循环渗流法可以使重塑黄土饱和取得较好的效果;饱和石碑塬黄土具有明显的液化特征,在强震作用下发生液化,液化后强度大大衰减,应力-应变曲线呈弱硬化型,分为两个阶段;干密度和初始有效围压对液化后黄土的强度有一定影响,初始有效围压与不排水强度呈拟合度较高的线性关系,初始有效围压越高,液化后不排水强度越大。
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| 关 键 词： | 石碑塬黄土 饱和方法 室内试验 液化后变形 液化后强度 |
| 收稿时间： | 2015/8/30 0:00:00 |
Experimental Study on the Post-liquefaction Strength and Deformation Behavior of Saturated Loess |
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| SHI Wei-xiong,ZHANG Zi-dong,GAO He-xin,TU Guo-xiang and ZHANG Xiao-chao.Experimental Study on the Post-liquefaction Strength and Deformation Behavior of Saturated Loess[J].Northwestern Seismological Journal,2016,38(6):922-928. |
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| Authors: | SHI Wei-xiong ZHANG Zi-dong GAO He-xin TU Guo-xiang and ZHANG Xiao-chao |
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| Institution: | CREEC(Northwest) Survey and Design Co. LTD, Lanzhou 730000, Gansu, China,College of Environmental and Civil Engineering, Chengdu University of Technology, Chengdu 610059, Sichuan, China,College of Environmental and Civil Engineering, Chengdu University of Technology, Chengdu 610059, Sichuan, China,State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University ofTechnology, Chengdu 610059, Sichuan, China and State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University ofTechnology, Chengdu 610059, Sichuan, China |
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| Abstract: | A series of tests are performed to explore the post-liquefaction deformation characteristics of saturated loess in the Shibeiyuan tableland area. In addition, we compare the stress-strain curves of liquefied loess with those of non-liquefied ones under monotonic static load using the MTS810 dynamic triaxial testing apparatus. We also discuss the influence of drying density and initial effective confining pressure on the post-liquefaction deformation characteristics of loess. The experimental results show that the ventilation period and water period greatly influence the pore pressure coefficient (B value). The saturated loess in the Shibeiyuan tableland has obvious liquefaction characteristics; it is easily liquefied under strong earthquakes, and its strength is greatly decreased after liquefaction. The stress-strain curve of saturated loess after liquefaction under monotonic static loads changes into the weak hardening type in two stages: strength recovery and stable strength. The drying density and initial effective confining pressure have a certain effect on the strength of liquefied loess. There is a linear positive relationship with good fitting between the initial effective confining pressure and undrained strength after liquefaction. |
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| Keywords: | loess in Shibeiyuan tableland saturation method indoor test post-liquefaction deformation post-liquefaction strength |
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