| 初始孔隙比对饱和砂土动力特性影响研究 |
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| 引用本文： | 曹久亭,孙阳光,黄思杰,刘夫江,刘辰,刘春伟. 初始孔隙比对饱和砂土动力特性影响研究[J]. 三峡大学学报(自然科学版), 2014, 0(2): 68-71 |
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| 作者姓名： | 曹久亭 孙阳光 黄思杰 刘夫江 刘辰 刘春伟 |
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| 作者单位： | 河海大学岩土力学与堤坝工程教育部重点实验室;河海大学安全与防灾工程研究所;河海大学岩土工程科学研究所;山东临沂水利工程总公司;临沂南水北调办公室; |
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| 基金项目： | 国家自然科学基金面上项目(51278382) |
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| 摘 要： | 通过对汶川细砂在不同循环应力比下的等压固结不排水动三轴试验,着重研究了考虑初始孔隙比对饱和砂土的动强度与孔压特性影响,建立了不同有效围压下的动抗剪强度表示方法,比较了一定振次下的动强度指标,为抗震设计提供参考与借鉴.从孔压随荷载循环次数变化和一定振次下液化所需的循环应力比这两种角度研究孔压特性,结果表明:相对密实度对砂土抗液化能力有着显著影响,孔压的发展取决于初始孔隙比,循环应力比越高时,表现得越明显.
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| 关 键 词： | 饱和砂土 循环应力比 初始孔隙比 动强度 孔压 |
Study of Impact of Initial Void Ratio on Dynamic Behavior of Saturated Sands |
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| Cao Jiuting,Sun Yangguang,Huang Sijie,Liu Fujiang,Liu Chen,Liu Chunwei. Study of Impact of Initial Void Ratio on Dynamic Behavior of Saturated Sands[J]. Journal of China Three Gorges University(Natural Sciences), 2014, 0(2): 68-71 |
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| Authors: | Cao Jiuting Sun Yangguang Huang Sijie Liu Fujiang Liu Chen Liu Chunwei |
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| Affiliation: | 1. Key Laboratory of Ministry of Education for Geomechanics ＆ Embankment Engineering, Hohai Univ. , Nanjing 210098, China;2. Institute of Engineering Safety ＆ Disaster Prevention, Hohai Univ. , Nanjing 210098, China; 3. Geotechnical Research Institute, Hohai Univ. , Nanjing 210098, China; 4. Linyi General Company of Water Conservancy Engineering of Shandong Province, Linyi 276006, China; 5. Linyi South-to- North Water Diversion Office, Linyi 276000, China) |
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| Abstract: | According to undrained dynamic triaxial tests of Wenchuan fine sand under isotropic consolidation under different cyclic stress ratios, the dynamic strength and pore pressure characteristics of the saturated sands with initial void ratio are studied. A method to determine the dynamic strength is suggested under different effective confining pressures. The values of the dynamic strength index is compared under the number of cycles; so as to offer reference for seismic design in practical engineering. The pore pressure characteristics are studied from the pore pressure varying with the load cycles and the cyclic stress ratio required to induce liquefaction for given number of cycles of loading. The results show that the relative density of sand has a significant impact on liquefaction resistance. The excel pore water pressure generation depends on the initial void ratio and is more prounced for higher cyclic stress ratio values. |
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| Keywords: | saturated sands cyclic stress ratio initial void ratio dynamic strength pore pressure |
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