郑西高速铁路豫西段黄土现场浸水自重湿陷特征研究

›› 2012, Vol. 33 ›› Issue (6): 1769-1773.

郑西高速铁路豫西段黄土现场浸水自重湿陷特征研究

武小鹏^{1, 2}，熊治文²，王小军³，屈耀辉²

1.兰州大学土木工程与力学学院，兰州 730000；2.中铁西北科学研究院有限公司，兰州 730000；3.浙江大学宁波理工学院，宁波 315100

收稿日期:2010-12-16 出版日期:2012-06-11 发布日期:2012-06-14
作者简介:武小鹏，男，1978年生，博士研究生，工程师，主要从事特殊土地基路基的研究工作
基金资助:
铁道部科技研究开发计划项目(No. 2005K001-B-1)

Study of immersion collapsible characteristics under overburden pressure of Western Henan loess along Zhengzhou-Xi'an high-speed railway

WU Xiao-peng^{1, 2}，XIONG Zhi-wen²，WANG Xiao-jun ³，QU Yao-hui²

1.School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China; 2. Northwest Research Institute Co., Ltd. of China Railway Engineering Corporation, Lanzhou 730000, China; 3. Ningbo Institute of Technology, Zhejiang University, Ningbo, Zhejiang 315100, China

Received:2010-12-16 Online:2012-06-11 Published:2012-06-14

摘要/Abstract

摘要： 通过现场浸水试验，研究了郑西高速铁路豫西段典型黄土场地浸水后的自重湿陷特征，分析了湿陷土层深度随浸水时间的演化规律，判定了浸水水平向影响范围。研究表明：浸水边界对沉降的影响十分明显，浸水后的湿陷速率呈现出慢-快-慢直至稳定的特点，在浸水10 d后已完成总沉降量的60%，浸水30 d时完成总沉降量的约90%；该场地实测因地区土质而异的修正系数为1.30，大于规范推荐的0.9，说明该地区黄土的湿陷程度比以往认识地更为强烈；该场地自重湿陷土层下限深度室内试验值是19 m，而现场实测值是16 m，前者是后者的1.2倍。通过综合判定，该场地浸水后的湿陷变形范围为距试坑边缘20 m，与试坑的直径相当，建议在郑西高速铁路沿线此类黄土场地，线路两侧20 m范围内不得积水。该研究成果已在郑西高速铁路建设中得到应用，也可为该地区类似工程提供参考。

关键词: 郑西高速铁路, 自重湿陷性黄土, 现场浸水试验, 湿陷特征

Abstract: This paper makes a study of the collapsible characteristics under overburden pressure of the Western Henan loess along Zhengzhou-Xi'an high-speed railway by field experiment. The developing process in the depth of loess collapsibility under overburden pressure and the collapsible horizontal distance have also been analyzed. The results show that: the influence of soaking boundary on collapse is very clear; but collapsible rate shows a slow-fast-slow-until-stable tendency, with 60% of the total settlement immersed for 10 days and 90% for 30 days. The of the site is 1.30, greater than the recommended 0.9 by the code. The results show that the extent of collapsibility of this region is more intense than that of general knowledge. In the site, loess collapse under overburden pressure maximum depth laboratory test value is 19 m; and field test value is 16 m, the former is 1.2 times the latter. The collapsible horizontal distance out of the test pit is 20 m, similar with the diameter of the test pit. Therefore, no water should be kept within 20 m from the embankment toe. The research results have been applied to the Zhengzhou-Xi'an high-speed railway construction, and can be taken as reference for similar projects in this region.

Key words: Zhengzhou-Xi'an high-speed railway, loess collapsibility under overburden pressure, field immersion test, collapsible characteristics

中图分类号:

TU 444

武小鹏，熊治文，王小军，屈耀辉 . 郑西高速铁路豫西段黄土现场浸水自重湿陷特征研究[J]. , 2012, 33(6): 1769-1773.

WU Xiao-peng ，XIONG Zhi-wen ，WANG Xiao-jun ，QU Yao-hui . Study of immersion collapsible characteristics under overburden pressure of Western Henan loess along Zhengzhou-Xi'an high-speed railway[J]. , 2012, 33(6): 1769-1773.

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