文档介绍：第 41 卷第 5 期中南大学学报(自然科学版) Vo l .4 1
2010 年 10 月 Journal of Central South University (Science and Technology) Oct. 2010
青藏铁路多年冻土斜坡路基失稳变形特性
苏谦,钟彪,王迅,黄俊杰,白皓
(西南交通大学土木工程学院,四川成都,610031)
摘要:从力学相似性角度对处于最大融化深度时的冻土斜坡路基进行离心模型试验,获得冻土斜坡路基的失稳
变形特性、影响因素及失稳原因。通过天然冻土斜坡的现场试验结果验证基于力学相似性的离心模型试验方案的
合理性及试验结果的可靠性。试验结果表明:冻土斜坡路基发生失稳的根本原因是软弱带的抗剪强度不足,致使
路基发生较大变形;冻土斜坡路基的变形主要集中在冻融交界面之上的浅层土体,变形骤变点在冻融交界面附近;
滑裂面贯穿活动层后沿着冻融交界面;在本试验条件下,合理的路堤中心高度为 ~ m。
关键词:冻土斜坡路基;离心模型试验;稳定性;变形特性
中图分类号:;TU445 文献标志码:A 文章编号:1672−7207(2010)05−1938−07
Instable deformation characteristics of sloping subgrade in
permafrost region for Qinghai-Tibet railway
SU Qian, ZHONG Biao, WANG Xun, HUANG Jun-jie, BAI Hao
(School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China)
Abstract: A centrifuge model test of sloping subgrade was conducted using the mechanical similarity when the
freezing-thawing depth reaches the greatest. The deformation characteristics, influence factors as well as failure causes
were researched. Compared with the in-situ test achievement of the natural slope in the permafrost region, the feasibility
of the test scheme as well as the reliability of the results based on the mechanical similarity was verified. The results
show that the root cause of the instability is the deficiency of shear resistance strength