工程地质学报2017，Vol.25Issue(2)：292-299,8.DOI:10.13544/j.cnki.jeg.2017.02.004
原状与重塑黄土冻融过程渗透特性对比试验研究
COMPARATIVE EXPERIMENTAL STUDY ON PERMEABILITY OF UNDISTURBED AND REMOLDED LOESS UNDER FREEZING-THAWING CONDITION
摘要
Abstract
The influence of freeze-thaw action on the permeability of undisturbed and remolded Q3 loess in Xi'an city is comparatively studied by the SEM and triaxial consolidation permeability tests.The experimental data indicates that the microstructure of undisturbed and remolded loess all changes significantly under freezing-thawing condition.The soil cementation structure is weakened,and then the particle alignment becomes more loose.Finally,the void ratio of soil increases and makes the permeability enhanced.Freezing-thawing makes the surface structure of undisturbed and remolded loess destroyed greatly,and has a bigger influence on the undisturbed loess.The cracks produced by freezing-thawing process become the main channel for water flow and migration,resulting in the obvious increase of permeability for undisturbed and remolded loess.With the increment of water content,the permeability coefficients for undisturbed and remolded loess all firstly increase and then decrease under freeze-thaw cycle condition,complying with the parabola law.With the increase of freezing-thawing times,the permeability coefficients all firstly increase and finally approach to a steady state,following the exponential rule.With the increment of cell pressure,the permeability coefficients all firstly decrease and finally reach a steady state,also following the exponential rule.The permeability of undisturbed loess is always greater than that of remolded loess under the same condition.Moreover,the permeability coefficient difference between undisturbed and remolded loess is smaller with the increase of cell pressure.关键词
原状黄土/重塑黄土/冻融作用/微观结构/渗透性Key words
Undisturbed loess/Remolded loess/Freezing-thawing action/Microstructure/Permeability分类
天文与地球科学引用本文复制引用
许健,王掌权,任建威,袁俊..原状与重塑黄土冻融过程渗透特性对比试验研究[J].工程地质学报,2017,25(2):292-299,8.基金项目
国家自然科学基金项目(51478385,51208409),陕西省教育厅专项科研计划项目(15JK1406),冻土工程国家重点实验室开放基金项目(SKLFSE201312),西北电力设计院技术创新科研项目(XBl-TM04-2013)资助. （51478385,51208409）
