Analysis of Deformation Mechanism and Control Technology of Soft Rock Tunnel with High Geostress

2014 ◽  
Vol 638-640 ◽  
pp. 794-797
Author(s):  
Fei Pan ◽  
Sheng Guo Cheng
Keyword(s):  
Deformation Mechanism ◽  
Traffic Engineering ◽  
Soft Rock ◽  
Control Technology ◽  
Engineering Construction ◽  
Deformation Control ◽  
High Geostress ◽  
Rock Tunnels ◽  
Rock Tunnel ◽  
And Control

With the development of transportation construction, soft rock tunnel with high geostress construction has become a key problem to overcome of traffic engineering construction. In order to explore the deformation mechanism and control technology of soft rock tunnel with high geostress, Xiakou tunnel engineering as an example, the geological characteristics and deformation characteristics of the tunnel were analyzed, to obtain the deformation mechanism of soft rock tunnels with high geostress, and to develop deformation control technology, the results provide a basis and reference for the domestic and foreign the similar engineering construction.

scholarly journals Field Tests and research of Large Deformation Control Measures for Soft Rock Tunnel with High Geostress

2020 ◽  
Vol 570 ◽  
pp. 042006
Author(s):  
Xiaoming Sun ◽  
Bo Zhang ◽  
Yong Zhang ◽  
Xiaobing Qiao ◽  
Zhijiao Wang ◽  
...  
Keyword(s):  
Large Deformation ◽  
Field Tests ◽  
Soft Rock ◽  
Control Measures ◽  
Deformation Control ◽  
High Geostress ◽  
Rock Tunnel

Study on the deformation mechanism of deep soft rock tunnel and its control

2014 ◽  
pp. 923-926
Author(s):  
Hebing Luan ◽  
Dezhong Kong ◽  
Zhaohui Wang ◽  
Weishun Sun
Keyword(s):  
Deformation Mechanism ◽  
Soft Rock ◽  
Rock Tunnel

Discussion for Displacement Control Criteria of Soft Rock Tunnel in the Seismic Area

2013 ◽  
Vol 353-356 ◽  
pp. 1440-1445
Author(s):  
Jin Hua Xu ◽  
Chuan He ◽  
Yi Zhou ◽  
Hai Bin Wu
Keyword(s):  
Cross Section ◽  
Soft Rock ◽  
Surrounding Rock ◽  
Great Earthquake ◽  
Displacement Control ◽  
Deformation Control ◽  
The One ◽  
Rock Tunnel ◽  
Control Criteria ◽  
Seismic Area

This paper studies on a certain highway project which passes through Longmen Shan fault zone, the one triggers 5.12 Wenchuan earthquakes directly. The region where the project resides is characterized by high percentage of soft rock mass, in particular the phyllite. Series of landslide have hitherto happened due to the instability of mountains along the highway which was caused by the great earthquake. Besides, since the phyllite-dominated rock was low-strength and easily soften by water, engineering disasters such as cave-in and large deformation of surrounding rock occurred frequently during the construction of tunnels located along the highway. The existing deformation control criteria fail gradually to fill the requirements of safe tunnelling. The author analyzed monitoring data from different tunnels with different cross-section types and different surrounding rock conditions, referred to relevant norms and eventually proposes new deformation control criteria based on allowable deformation and deformation rate.

scholarly journals Failure mechanism and control technology of water-immersed roadway in high-stress and soft rock in a deep mine

2017 ◽  
Vol 27 (2) ◽  
pp. 245-252 ◽  
Author(s):  
Renshu Yang ◽  
Yongliang Li ◽  
Dongming Guo ◽  
Lan Yao ◽  
Tongmao Yang ◽  
...  
Keyword(s):  
Failure Mechanism ◽  
High Stress ◽  
Soft Rock ◽  
Control Technology ◽  
Deep Mine ◽  
And Control

scholarly journals Support Measures to Prevent the Deformation and Failure of a Carbonaceous Mudstone Tunnel

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Yongdong Wang ◽  
Haitao Jiang ◽  
Xin Yan ◽  
Huiru Liang ◽  
Guoan Li ◽  
...  
Keyword(s):  
Soft Rock ◽  
Control Measures ◽  
Rock Stratum ◽  
Deformation And Failure ◽  
Pipe System ◽  
Deformation Control ◽  
Support Measure ◽  
Connection System ◽  
Prevention And Control Measures ◽  
Rock Tunnel

A carbonaceous mudstone tunnel is a type of soft rock tunnel. There is little research on the prevention and control measures for the deformation and failure of carbonaceous mudstone tunnels. In this article, we investigated the construction of the Qiguding carbonaceous mudstone tunnel in Meizhou City, Guangdong Province, China. We monitored and analyzed the deformation and stress characteristics of a section under the original support scheme. The monitoring data showed that this section had large peripheral convergence, vault subsidence, steel arch strain, and concrete strain. The deformations exhibited significant differences in the horizontal and vertical directions, eventually resulting in concrete cracking, steel arch bulging, and distortion in the section. The analysis showed that the primary mechanisms for the failure were the softening characteristics of the carbonaceous mudstone, the plastic rheology, and the shear slip of the rock stratum. Based on a comparative analysis and numerical simulation, we proposed a new support measure called the longitudinal rigid enlarged foundation that consists of a steel arch longitudinal connection system and a locking foot anchor pipe system. Several comparative tests were performed at the tunnel site. The results demonstrated the excellent performance and reliability of the proposed support scheme for the deformation control of the carbonaceous mudstone, providing a reference for similar projects.

Preliminary Study on Application of Metal Members with Corrugated Webs in the Supports of Soft Rock

2011 ◽  
Vol 90-93 ◽  
pp. 2380-2388 ◽  
Author(s):  
Li Li Wu ◽  
Zhen Yu ◽  
Dong Dong Zhang
Keyword(s):  
Soft Rock ◽  
Steel Plates ◽  
Elastic Buckling ◽  
Buckling Loads ◽  
Corrugated Webs ◽  
New Type ◽  
Mechanical Performances ◽  
Sectional Parameters ◽  
Rock Tunnels ◽  
Rock Tunnel

A new type of metal support named H-Shaped members with corrugated webs is put forward for the soft rock tunnels or roadways supports. The H-shaped member with corrugated webs is welded by corrugated webs and plain flange steel plates. The loading behaviors of the members are greatly improved by the corrugation in the webs compared with that of the members with plain webs. The new type of support has fair good mechanical performances with its own merits, including easy fabrication, fast construction etc. especially it can adapt to the large deformation of soft rocks. The elastic buckling behaviors are analyzed for the new horse-shoe shape supports with corrugated webs. The influences of the sectional parameters on the elastic buckling loads are discussed herein. Results show that the wave amplitude and wave height of corrugated webs have less influence on the buckling loads than those of the height of the webs and the width of the flanges etc. Some problems worth studying in the future for the new type of tunnel supports are also raised. Keywords: corrugated web; support structure; soft rock; tunnel; buckling

Research on the Surrounding Rock Damage of Deep Hard Rock Tunnels Caused by Bottom Excavation

2012 ◽  
Vol 170-173 ◽  
pp. 1700-1703
Author(s):  
Zhen Wang ◽  
Chu Nan Tang ◽  
Tian Hui Ma ◽  
Lian Chong Li ◽  
Yue Feng Yang
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Hard Rock ◽  
Surrounding Rock ◽  
Rock Damage ◽  
Simulation Approach ◽  
High Geostress ◽  
Intact Rock Mass ◽  
Rock Tunnels ◽  
Rock Tunnel

The damage features of surrounding rock in the process of bottom excavation in deep hard rock tunnel were investigated, combining with the actual tunnel data of JinpingⅡHydropower Station and using numerical simulation approach. The evolution mechanism of microfractures initiation, growth and expansion in deep intact rock mass was performed. It’s shown that the fractures caused by bottom excavation develop to deeper surrounding rock due to stress adjustment, and the zone that have been supported also has some damage. The research results provide important references to understand the damage features of surrounding rock in deep hard rock under high geostress.

Squeezing deformation control during bench excavation for the Jinping deep soft-rock tunnel

2020 ◽  
Vol 116 ◽  
pp. 104761
Author(s):  
Chuanqing Zhang ◽  
Guojian Cui ◽  
Yang Zhang ◽  
Hui Zhou ◽  
Ning Liu ◽  
...  
Keyword(s):  
Soft Rock ◽  
Deformation Control ◽  
Rock Tunnel
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