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| 非饱和黄土震陷物理力学机制与主导影响因素 | |
| 引用本文： | 孙军杰,王强,王兰民. 非饱和黄土震陷物理力学机制与主导影响因素[J]. 地震工程学报, 2011, 33(Z1) |
| 作者姓名： | 孙军杰 王强 王兰民 |
| 作者单位： | 中国地震局兰州地震研究所,甘肃兰州730000;中国地震局黄土地震工程开放实验室,甘肃兰州730000;甘肃省岩土防灾工程技术研究中心,甘肃兰州730000 |
| 摘 要： | 通过分析黄土震陷的物理过程及其力学机制,指出非饱和黄土震陷实质上是土体广义固相介质响应外部动荷载作用的再固结过程。将影响黄土震陷的主导因素归纳为两方面,即土体广义固相介质的强度、体积特征和外部动荷载特征。介质的强度特征可通过引入土工试验获取的参数(粘聚力和内摩擦角)来宏观表征;体积特征可由能够反映土体欠压密程度的孔隙比描述。与非饱和黄土震陷的宏观物理力学机制相适应,粘聚力与内摩擦角主要反映土体的结构性强度(黄土强度特征),孔隙比则反映了土体再固结的潜在性态(黄土沉降量值特征);黄土强度特征对应土体抵御外部载荷的能力,黄土沉降量值特征对应外部载荷作用下的土体沉降能力。 |
| 关 键 词： | 非饱和黄土 广义固相介质 动荷载 震陷 物理力学机制 影响因素 |
Study on the Physical-mechanical Mechanism and Dominant Influence Factors of Unsaturated Loess Subsidence under Seismic Loading |
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| SUN Jun-jie,WANG Qiang,WANG Lan-min. Study on the Physical-mechanical Mechanism and Dominant Influence Factors of Unsaturated Loess Subsidence under Seismic Loading[J]. China Earthguake Engineering Journal, 2011, 33(Z1) | |
| Authors: | SUN Jun-jie WANG Qiang WANG Lan-min |
| Affiliation: | SUN Jun-jie1,2,3,WANG Qiang1,WANG Lan-min1,3(1.Lanzhou Institute of Seismology,CEA,Lanzhou 730000,China,2.Open Laboratory of Loess Earthquake Engineering,3.Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province,China) |
| Abstract: | Based on the comprehensive analysis of physical process and mechanical mechanism of loess seismic subsidence,the seismic subsidence of unsaturated loess could be described as a consolidation response of generalized solid-phase-media of soil mass under external dynamic loading.The dominant influence factors of loess seismic subsidence should include two aspects,which are the strength and volume characteristics of generalized solid-phase-media of soil mass and external dynamic loading features.The strength ch... |
| Keywords: | Unsaturated loess Generalized solid-phase-media Dynamic loading Seismic subsidence Physical-mechanical mechanism Influence factor |
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