Model test study on vibration blasting of large cross-section tunnel with small clearance in horizontal stratified surrounding rock

2019 ◽  
Vol 92 ◽  
pp. 103013 ◽  
Author(s):  
Shuguang Song ◽  
Shucai Li ◽  
Liping Li ◽  
Shaoshuai Shi ◽  
Zongqing Zhou ◽  
...  
Keyword(s):  
Cross Section ◽  
Model Test ◽  
Surrounding Rock ◽  
Large Cross Section ◽  
Test Study ◽  
Small Clearance

Model Test Study on Failure Mechanism of Unsupported Tunnels Constructed in Soft Rock Masses at Different Cross Section

2011 ◽  
Vol 90-93 ◽  
pp. 2282-2285
Author(s):  
Cheng Bing Wang ◽  
He Hua Zhu ◽  
Hua Lao Wang
Keyword(s):  
Cross Section ◽  
Failure Process ◽  
Ground Surface ◽  
Soft Rock ◽  
Surrounding Rock ◽  
Test Study ◽  
Gravitational Stress ◽  
Section Type ◽  
Failure Conditions ◽  
Full Face

The failure conditions of tunnel surrounding rock under different cross section after full face excavation were studied through a number of model tests. The simulation of unsupported tunnel failure process under gravitational stress is carried out successfully in the tests. The test results show that failure of surrounding rock initiates from the upper part of the tunnel and develops upward progressively. Failure form of tunnel is different under different cross section type. Comparing with two-lane tunnel, the surrounding rock of three-lane tunnel keeps shorter stabilization, failure develops to the ground surface more rapidly, the stress changing amplitude of those beside tunnel is larger, and the rock mass on the top of the tunnel slides downward more clearly.

Model Test Study on Spatial Deformation Law of Surrounding Rock for Super-Large Section and Shallow Buried Tunnels

2018 ◽  
Vol 42 (3) ◽  
pp. 20170243 ◽  
Author(s):  
Cong Liu ◽  
Shucai Li ◽  
Zongqing Zhou ◽  
Liping Li ◽  
Kang Wang ◽  
...  
Keyword(s):  
Model Test ◽  
Surrounding Rock ◽  
Large Section ◽  
Spatial Deformation ◽  
Test Study ◽  
Deformation Law

Model Test Study on Insulator of Cold-Region Tunnel in Northeast China: A Case Study of Gaoling Tunnel

2011 ◽  
Vol 71-78 ◽  
pp. 1870-1874
Author(s):  
Jin Xing Lai ◽  
Cheng Bing Gong ◽  
Yan Song Wang
Keyword(s):  
Temperature Field ◽  
Thermal Insulation ◽  
Model Test ◽  
Similarity Theory ◽  
Decisive Role ◽  
Negative Temperature ◽  
Surrounding Rock ◽  
Systemic Analysis ◽  
Test Study

Based on similarity theory, the systemic analysis for the distribution characteristics of tunnel temperature field in two different working conditions of having no thermal insulation and installing PU as insulator is progressed by using manufactured model test platform in order to realize the tunnel temperature field rule in cold regions with or without thermal insulation and the influence of thermal insulation layout pattern on insulating effect. The results show that the temperature variation conforms to the “tunnel freeze-thaw circle” theory without thermal insulation, and the surrounding rock maintains negative temperature all the time in the low temperature environment; the internal temperature field of surrounding rock plays a decisive role on the surface temperature of surrounding rock, which keeps above 0°C after the layout of thermal insulation with appropriate material and thickness.

scholarly journals The Researches on Construction Response and Excavation Method Optimization of Extra-large Cross-section Urban Subway Tunnel

2018 ◽  
Vol 38 ◽  
pp. 03041 ◽  
Author(s):  
Bo Wu ◽  
Wei Huang ◽  
Yong Bo Zhao
Keyword(s):  
Mechanical Behavior ◽  
Cross Section ◽  
Surrounding Rock ◽  
Large Cross Section ◽  
Subway Tunnel ◽  
Construction Methods ◽  
Method Optimization ◽  
Underground Station ◽  
The City ◽  
Selection Of

In the extra-large cross-section urban subway underground station projects, the key problem is to choose the appropriate excavation method and grasp the mechanical behavior of the surrounding rock after excavation. The double side drift method is widely used in the urban subway underground station construction with extra-large cross-section in China. This paper presents the deformation characteristics of the extra-large cross-section tunnel of urban subway and a comparison with the numerical simulation results. In the city subway underground excavation of large section station, the mechanical behavior of surrounding rock change and its influence on the surrounding area mainly depend on the selection of construction methods. The convergent deformation of tunnel cavern, the subsidence of the surface and the force failure of the surrounding rock associated the construction approaches are demonstrated. This study provides a more in-depth demonstration of the way to optimize the excavation method of the extra-large cross-section tunnel to achieve the purpose of controlling the deformation of the surface and surrounding rock.

Sign in / Sign up

Export Citation Format

Share Document