| 压实作用对泥岩膨胀性及水分迁移影响 |
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| 引用本文： | 张唐瑜,马丽娜,张戎令,王起才,王天双.压实作用对泥岩膨胀性及水分迁移影响[J].中国地质灾害与防治学报,2019,30(4):98-103. |
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| 作者姓名： | 张唐瑜 马丽娜 张戎令 王起才 王天双 |
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| 作者单位： | 兰州交通大学土木工程学院;兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室;卡迪夫大学工程学院 |
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| 基金项目： | 青年人才托举工程(2015QNRC001);飞天学者特聘计划;博士后面上资助(2016M602892);长江学者和创新团队发展计划滚动支持(IRT_15R29);陇原青年创新创业人才团队项目资助;甘肃省高校协同创新科技团队支持计划资助;兰州交通大学优秀平台(201606) |
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| 摘 要： | 为研究压实作用对泥岩膨胀性及水分迁移的影响,将碾碎过筛泥岩以不同干密度分层夯实到自制试验箱中进行试验,采用高精度位移传感器和TDR-4型湿度传感器进行数据采集,并采用体式显微镜对泥岩颗粒进行微观结构分析。研究结果表明:不同压实作用下泥岩膨胀过程均经历初期快速陡增阶段、中期膨胀减缓阶段和后期膨胀稳定阶段;体积含水率增大过程均经历跳跃式快速增长阶段、外凸弧线缓慢增长阶段和后期稳定阶段;随着干密度的增加,其稳定膨胀量和稳定膨胀率近似呈线形增加;水分在泥岩中的迁移与泥岩自身膨胀挤密和大气影响深度相关,干密度越大,膨胀挤密效果越明显,大气影响深度越小,其水分迁移速度越小;泥岩颗粒孔隙较为发育,连通性较好,可为水分迁移提供通道;泥岩浸水膨胀后呈泥质状态,颗粒间黏结发生破坏。研究可为膨胀泥岩地区高速铁路的修建提供参考依据。
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| 关 键 词： | 高速铁路 泥岩 膨胀 水分迁移 微观结构 |
Effect of compaction on swelling and water migration of expansive mudstone |
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| ZHANG Tangyu,MA Lina,ZHANG Rongling,WANG Qica,WANG Tianshuang.Effect of compaction on swelling and water migration of expansive mudstone[J].The Chinese Journal of Geological Hazard and Control,2019,30(4):98-103. |
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| Authors: | ZHANG Tangyu MA Lina ZHANG Rongling WANG Qica WANG Tianshuang |
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| Affiliation: | (College of Civil Engineering,Lanzhou Jiaotong University,Lanzhou,Gansu 730070,China;Key Laboratory of Road & Bridges and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou,Gansu 730070,China;Cardiff University,School of Engineering,CF24 3AA,UK) |
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| Abstract: | In order to study the effect of compaction on the expansion and water migration of mudstone,the crushed and screened siltstone was compacted by layers with different dry densities into a self-made test chamber for testing.The data were measured using a high-precision displacement sensor and a TDR-4 humidity sensor.Moreover,the microstructure of mudstone particles was analyzed by a stereo microscope.The results show the following:1)the swelling process of mudstone under different compaction conditions undergoes three stages of initial rapid increase,middle slowdown,and later stabilization;2)the process of increasing volume water content experienced jump-type rapid growth stage,slow growth stage of the convex curve,and later stable stage;3)with the increase of dry density,the stable swelling increment and swelling rate increased approximately linearly;4)moisture migration in mudstone was related to the expansion and compaction of mudstone itself and the depth of atmospheric influence.The larger the dry density is,the more obvious the effect of expansion and compaction is.The smaller the depth of atmospheric influence is,the smaller the velocity of water migration is;5)pores were well mudstone developed among mudstone particles with good connectivity,which provided channels for water migration;6)mudstone was in a muddy state after water immersion and expansion,and the bond between particles was destroyed.This study will provide reference for the construction of high-speed railway in dilated mudstone area. |
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| Keywords: | high-speed railway mudstone swelling water migration microstructure |
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