西南地区某隧道底鼓病害原因分析-《高速铁路技术》

文章信息/Info

Author(s):: WANG Maojing; WU Junmeng; China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China

Keywords:: tunnel|invert|floor bulg|rock strength|cause analysis|structural strength|curvature

摘要:: 西南山区某隧道2009年开通运营，2012年3月发现隧底有3段存在不同程度的底鼓病害。经整治处理后，隧道底鼓变形得到一定抑制，但未能彻底消除，铁路不得不限速通行。针对这一问题，本文结合隧道所处的区域地质环境和地质补充勘察成果资料，深入分析了隧道底鼓病害产生的主要原因，提出了隧道设计应高度重视地应力、岩体强度及岩石产状之间关系的建议，并指出了隧底仰拱的结构强度及曲率是抵抗岩体变形的重要参数。

Abstract:: It was found in March 2012 that there were floor bulgs in three sections of a tunnel in the southwest mountainous area that was put into service in 2009. After treatment, these floor bulgs was restrained to some extent, but not completely eliminated, and the railway had to be run at a limited speed. To solve this problem, combined with the regional geological environment where the tunnel is located and the results of supplementary geological survey, this paper makes an in-depth analysis on the main causes of floor bulgs, and suggests that great importance should be attached to the relationship among crustal stress, rock strength, and rock occurrence during tunnel design, and points out that the structural strength and curvature of the invert at the tunnel floor are important parameters to resist rock deformation.