冲击压实路基黄土的微观特征研究

›› 2006, Vol. 27 ›› Issue (6): 939-944.

冲击压实路基黄土的微观特征研究

王生新^{1, 2}，韩文峰^{1, 3}，谌文武^{1, 2}，梁庆国¹

1. 兰州大学土木工程与力学学院，兰州 730000；2. 兰州大学西部灾害与环境力学教育部重点实验室，兰州 730000； 3. 天津城市建设学院土木工程系，天津 300381

收稿日期:2004-09-19 出版日期:2006-06-10 发布日期:2013-11-14
作者简介:王生新，男，1966年生，博士研究生，高级工程师，注册土木工程师，主要从事地基处理方面的科研工作。
基金资助:
交通部西部交通建设科技资助项目（2001-318-000-18）：黄土路基压实技术

Microstudy on roadbed loess improvement by impact compaction technology

WANG Sheng-xin^{1, 2}, HAN Wen-feng^{1, 3}, CHEN Wen-wu^{1, 2}, LIANG Qing-guo¹

1. School of Civil Engineering and mechanics, Lanzhou University, Lanzhou 730000, China; 2. Key Laboratory of Mechanics on Western Disasterand Environment, Ministry of Education, Lanzhou University, Lanzhou 730000, China; 3. Department of Civil Engineering, Tianjin College of Urban Construction, Tianjin 300381, China

Received:2004-09-19 Online:2006-06-10 Published:2013-11-14

摘要/Abstract

摘要： 采用扫描电镜和压汞试验研究了天然黄土和冲击压实8～40遍路基黄土的微观结构和孔隙特征。结果表明：天然黄土和冲击压实8遍的路基黄土，其微结构以粒状架空结构为主；冲击压实16～40遍，土的微结构变成粒状镶嵌结构。冲击压实16遍前后，土的孔隙直径分布在0.006～164 μm之间，平均孔径从0.767 9 μm降低到0.0 711 μm，中等孔径从5.264 μm减少到0.568 4 μm；但孔隙表面积从0.624 m2/g增加到7.517 m2/g。孔径分布在10 μm和2 μm处出现分界值，16遍前2

关键词: 路基黄土, 冲击压实, 扫描电镜, 压汞分析, 孔径分布

Abstract: The microstructure and pore characteristics of natural loess and roadbed loess improved by impact compaction after 8-40 compactor passes were qualitatively and quantitatively studied on the basis of the test results from scanning electron microscope (SEM) and mercury intrusion porosimetry(MIP). The results show that open structure is the main structure type of natural loess and roadbed loess after 8 compactor passes; and inter-particle inlaid structure is the main type of roadbed loess after 16-40 compactor passes; The pore size distribution is within the range of 0.006~164 μm before and after 16 compactor passes, the average pore diameter has been lowered from 0.767 9 μm to 0.071 1 μm; the median pore diameter has been decreased from 5.264 μm to 0.5684 μm. The pore surface area has been increased from 0.624 m2/g to 7.517 m2/g; there are two dividing pore diameters of 10 μm and 2 μm for all types of loess, and for the loess before 16 compactor passes, the pores with diameter between 2 to 10μm cover 67.53 % of all the pores, while the pores with diameter less than 2μm cover 68.07 % for loess after 16 compactor passes. Therefore the optimum compactor pass is 16 and the improvement mechanism of impact compaction is change in loess microstructure and increase of micropores.

Key words: roadbed loess, impact compaction, scanning electron microscope (SEM), mercury intrusion porosimetry (MIP), pore size distribution

中图分类号:

TU 41

王生新，韩文峰，谌文武，梁庆国 . 冲击压实路基黄土的微观特征研究[J]. , 2006, 27(6): 939-944.

WANG Sheng-xin , HAN Wen-feng , CHEN Wen-wu , LIANG Qing-guo . Microstudy on roadbed loess improvement by impact compaction technology[J]. , 2006, 27(6): 939-944.

参考文献

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