[1]李晓峰,肖成志,等.压实度和含水率对含砂粉土性质的影响[J].深圳大学学报理工版,2017,34(No.5(441-550)):501-508.
 Li Xiaofeng,Xiao Chengzhi,and Zhang Jingjuan,et al.The performance of sandy silt affectedby compaction degrees and water content[J].Journal of Shenzhen University Science and Engineering,2017,34(No.5(441-550)):501-508.
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压实度和含水率对含砂粉土性质的影响()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第34卷
期数:
2017年No.5(441-550)
页码:
501-508
栏目:
土木建筑工程
出版日期:
2017-09-30

文章信息/Info

Title:
The performance of sandy silt affectedby compaction degrees and water content
作者:
李晓峰1 肖成志1 2 张静娟1
1)河北工业大学土木与交通学院,天津 300401;2)河北工业大学河北省土木工程技术研究中心,天津 300401
Author(s):
Li Xiaofeng1 Xiao Chengzhi1 2 and Zhang Jingjuan1
1) School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, P.R.China2) Technology and Research Center of Civil Engineering, Hebei University of Technology, Tianjin 300401, P.R.China
关键词:
岩土工程 粉土 静三轴试验 含砂量 压实度 含水率
Keywords:
geotechnical engineering silt static triaxial test sand content compaction degree water content
文献标志码:
A
摘要:
基于静三轴试验,分析不同含砂量、压实度和含水率对粉土应力-应变曲线和抗剪强度指标的影响. 试验结果表明,相同围压下增加粉土中含砂量,粉土峰值强度呈增加趋势,且围压较低时不同含砂量粉土均呈现不同程度应变软化现象,增高围压水平时应变软化现象减弱;增加含水率对粉土强度削弱明显,且最优含水率下粉土应变软化现象明显,粉土应变软化随含水率增加呈减弱趋势;减少压实度时应变软化现象减弱并最终趋于消失,相同围压下压实度越高,粉土峰值强度越大,且围压水平越低,压实度对峰值强度的影响越明显;同等条件下增加含砂量、提高压实度或减少含水率,均可显著提高粉土黏聚力,但对其内摩擦角影响较小,且压实度越高,含水率越小,含砂量越大,粉土的抗剪强度越高.
Abstract:
Based on the static triaxial test, the effects of sand content (α), compactness (K) and water content (w) on the stress-strain curve and shear strength were analyzed comprehensively. The tests indicate that under the same confining pressure, the increase of sand content in silt results in the increase of peak strength remarkably. The silt with different sand content are characterized by strain softening while keeping low confining pressure, the strain softening phenomenon is tend to be weakened when increasing confining pressure. The peak strength of silt decreases obviously with the increase of water content. Moreover, strain softening phenomenon for silt with optimum water content is obvious, the strain softening phenomenon tends to be weakened. Decreasing compaction degrees of silt, strain softening has been weakened and ultimately disappears. For the same confining pressure, the higher compaction degree is, the greater the peak strength of silt is.When lowering confining pressure, compaction degree plays a more important role in the effect of peak strength. While keeping the remained parameters identical, increasing sand content, enhancing compaction degrees or reducing water content in silt can significantly increase its cohesion, and don’t obviously affect internal friction angle of silt. Generally, keeping higher compaction degree, less water content and more sand content can improve silt shear strength.

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更新日期/Last Update: 2017-09-11