宝兰客运专线强湿陷性黄土水稳性试验研究.pdfVIP

第59卷 第2期 铁 道 标 准 设 计 Vol.59 No.2 2015年2月 RAILWAY STANDARD DESIGN Feb. 2015 文章编号:1004 2954(2015)02 0023 04 宝兰客运专线强湿陷性黄土水稳性试验研究 1 1 1 2 叶朝良 , 刘尧军 , 李 青 , 白金州 (1. 石家庄铁道大学土木工程学院,石家庄 0500432;2. 河海大学土木与交通学院,南京 210098) 摘 要:通过自行设计的崩解试验和饱和前后的无侧限抗压强度试验,对宝兰客运专线强湿陷性黄土水稳性进行 试验研究,试验结果表明:宝兰强湿陷性黄土遇水前后抗压强度衰减显著,水稳性很差。 压实度在100%的试样崩 解时间仅为35~40min;相同时间下,压实度提高可以降低毛细水的上升高度,减缓其崩解速度,有效提高其抗渗 性。 饱和前后土样的应力应变关系均呈应变软化型变化规律;饱和前后土样的无侧限抗压强度差值达到295.0 kPa,强度衰减约77.1%。 关键词:宝兰客运专线; 黄土; 水稳性; 压实度; 崩解试验 + 中图分类号:U238;U213.1 4 文献标识码:A DOl:10.13238/ j.issn.1004-2954.2015.02.006 The Study of Water Stability of Collapsible Loess in Baoji-Lanzhou Passenger-dedicated Railway 1 1 1 2 Ye Chao-liang ,Liu Yao-jun ,Li Qing ,Bai Jin-zhou (1.College of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang050043,China; 2.College of Civil and Transportation Engineering,Hehai University,Nanjing210098,China) Abstract:The water stability of Collapsible Loess in Baoji-Lanzhou Passenger-dedicated Line is studied with disintegration test and unconfined compressive strength test. The results show that the compressive strength of Collapsible Loess in Baoji-Lanzhou Passenger-dedicated line is declined rapidly with poor water stability. When the compactness of soil samples is about 100%,the time of disintegration is only 35 ~40min,meanwhile,with the increasing of the compaction,the height of capillary water isincreased which accelerates