Seismic stability of loess tunnels under the effects of rain seepage and a train load

被引：0

作者：

CHENG XuanSheng ^{[1
,2
]}

MA Liang ^{[1
,2
]}

YU DongPo ^{[1
,2
]}

FAN Jin ^{[1
,2
]}

LI De ^{[1
,2
]}

机构：

[1] Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology

[2] Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology

来源：

Science China(Technological Sciences) | 2018年 / 05期

基金：

中国国家自然科学基金;

关键词：

loess; tunnel; rain water seepage; earthquake; stability;

D O I：

暂无

中图分类号：

U451 [隧道结构理论];

学科分类号：

0814 ; 081406 ;

摘要：

Loess tunnels are widely used in transportation engineering and are irreplaceable parts of transportation infrastructure. In this paper, a dynamic finite element method is used to analyze the coupled effects of a train vibration load and rainfall seepage. By calculating the variation in the safety factor of a loess tunnel because of the effects of various factors, such as different rainfall intensities and soil thicknesses, the dynamic stability of the loess tunnel is studied under the condition of a near-field pulse-like earthquake. The results show that the security and stability of the tunnel decrease gradually with decreasing burial depth. In addition, the plastic strain of the tunnel is mainly distributed on both sides of the vault and the feet, and the maximum value of the critical strain occurs on both sides of the arch feet. Because of the effects of the train vibration load and rainfall seepage, the safety factor of the loess tunnel structure decreases to a certain degree. Moreover, the range and maximum value of the plastic strain increase to various degrees.

引用

页码：735 / 747

页数：13