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冻融循环对不同孔隙率页岩相似材料影响的试验研究

王永岩,柳雪庆,苏传奇,张余标,魏剑   

  1. 1.  青岛科技大学
  • 收稿日期:2017-08-05 修回日期:2017-08-29 出版日期:2018-03-09
  • 通讯作者: 柳雪庆
  • 基金资助:
     

Experimental study on the effects of freeze-thaw cycles on similar materials with different porosity

    

  1.  
  • Received:2017-08-05 Revised:2017-08-29 Online:2018-03-09
  • Supported by:
     

摘要: 基于地质力学模型试验的相似理论,针对寒区岩体工程,分别制作了5种不同孔隙率的页岩相似材料,进行冻融循环试验,探究不同孔隙率的页岩相似材料在冻融前后,其主要物理力学参数的变化规律。试验研究表明:在冻融循环后,页岩相似材料的单轴抗压强度、三轴抗压强度、弹性模量、粘聚力、内摩擦角有不同程度的减小,孔隙率、泊松比有不同程度的增大。页岩相似材料受冻融循环的影响随孔隙率的增大先增大后减小,孔隙率处于9.4%~13.6%时,受冻融循环影响最大;孔隙率处于5.8%~9.4%时,受冻融循环的影响随孔隙率的增大有增大的趋势;孔隙率处于13.9%~19.1%时,受冻融循环的影响随孔隙率的增大有减小的趋势。研究结果可以为西部寒区的岩土工程建设和减灾提供相关的科学依据。

关键词: 冻融循环, 孔隙率, 相似材料

Abstract: Based on the similarity theory of model test in geomechanics, water, gypsum, cement, river sand were mixed in a certain proportion to make similar model. The porosity of the similar model changed with the particle size of the river sand. Five similar shale materials with different porosities were produced and the porosity of similar shale materials was measured by saturation method. The five kinds of similar shale materials were subjected to freeze-thaw cycles. The uniaxial compression tests and triaxial compression tests were performed on the similar shale materials without freeze-thaw cycles and with freeze-thaw cycles. The experimental research shows that after freeze-thaw cycles, the uniaxial compressive strength, triaxial compressive strength, modulus of elasticity, cohesion and internal friction angle of the similar shale materials have reduced; the porosity and Poisson's ratio have increased to some extent compared with those before freeze-thaw cycles. With the increase of porosity, the influence of freeze-thaw cycles on shale similar materials increases first and then decreases. When the porosity is 9.4%~13.6%, the similar shale materials are most affected by freeze-thaw cycles. When the porosity is 5.8%~9.4%, the influence of the freeze-thaw cycles on shale similar materials increases with porosity. When the porosity is 13.9%~19.1%, the influence of freeze-thaw cycles on shale similar materials decreases with the increase of porosity. The research results can provide scientific basis for the construction of geotechnical engineering and disaster reduction in western cold regions

Key words: freeze-thaw cycles, porosity, similarity materials

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