Lining pressure of railway tunnel in high geostress and soft surrounding rock

被引：0

作者：

Chen, Zhimin ^{[1
,2
]}

Zhao, Dean ^{[2
,3
]}

Li, Guoliang ^{[4
]}

Yu, Yunyan ^{[1
,2
]}

机构：

[1] Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province, Lanzhou Gansu 730070, China

[2] School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou Gansu 730070, China

[3] School of Civil Engineering, Northwest University for Nationalities, Lanzhou Gansu 730030, China

[4] China Railway First Survey and Design Institute Group Limited, Xi'an Shaanxi 710043, China

来源：

Zhongguo Tiedao Kexue/China Railway Science | 2011年 / 32卷 / 06期

关键词：

Displacement - High-geostress - Lining pressures - Release ratio of stress - Soft surrounding rocks;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

With Guanjiao tunnel as engineering background, the model for calculating the release ratio of excavation stress was adopted to study the lining pressure of railway tunnel under the geological conditions of high geostress and soft surrounding rock. Based on the in-situ measured geostress and construction monitoring displacement, the displacement around the tunnel unable to be monitored and the displacement before tunnel face were calculated according to the space effect in the excavation by benching tunneling method. Then, the final displacement of tunnel surrounding rock was forecasted by the improved BP artificial neural network model. The tunnel lining pressure and stress release rules were obtained by using the model for calculating the release ratio of excavation stress. The rules obtained by the above methods are generally consistent with the characteristic curves of classic surrounding rock and basically correspond with engineering experience and the state of site construction. The correctness and rationality of the above method under the geological conditions of high geostress and soft surrounding rock are validated by 3D numerical simulation using FLAC3D software. Both the calculation and simulation results indicate that the lining pressure at DyK307+900 is greater and the stress of the tunnel structure is in an unfavorable state because of the high geostress, soft surrounding rock and insufficient primary lining effect.

引用

页码：55 / 62