Instability Mechanism and Supporting Measure for Highway Tunnel with High Ground Stress and Soft Surrounding Rock

2014 ◽  
Vol 1049-1050 ◽  
pp. 213-216 ◽  
Author(s):  
Xiao Hui Xue ◽  
Zhong Ming Su ◽  
Zhi Jie Sun ◽  
Fei Song
Keyword(s):  
Field Monitoring ◽  
Surrounding Rock ◽  
Instability Mechanism ◽  
Geological Investigation ◽  
Highway Tunnel ◽  
Foamed Concrete ◽  
Ground Stress ◽  
Supporting Effect ◽  
Grouting Reinforcement ◽  
Deformation Instability

For the tunnel with high ground stress and soft surrounding rock, the deformation instability is the high frequency and great harm geological hazard. The supporting measure has become a important technique problem. This paper based on the Wuduxi tunnel, the characteristics of deformation and instability mechanism of surrounding rock and supporting structure are analyzed by means of the engineering geological investigation, theoretical analysis and field monitoring. The supporting measure include that using the steel floral tube to back up sidewall, adding support arch and filling foamed concrete, grouting reinforcement in basement. Finally, we use the field monitoring to check the supporting effect. The result shows that the supporting measure could achieve the desired treat effect and it has reference meaning to similar engineering.

Influence Law of Structural Inclination for the Advanced Excavation Method of the Tunnel

2013 ◽  
Vol 368-370 ◽  
pp. 1464-1467
Author(s):  
Chao Gao ◽  
Lei Chen ◽  
Shang Lun Liu
Keyword(s):  
Numerical Calculation ◽  
Hard Rock ◽  
Surrounding Rock ◽  
Tunnel Construction ◽  
Geological Condition ◽  
Construction Process ◽  
Rock Stability ◽  
Highway Tunnel ◽  
Calculation Results ◽  
Ground Stress

A deep-buried highway tunnel is constructed with complex geological condition which existing an alternation of soft and hard rock and having feature of high ground stress, and extrusion, fall-block and twisted phenomena of supporting structure appear in many places during construction which pose a serious threat to the safety of tunnel construction. In combination with the construction process of Shimenya tunnel, by using the finite difference software FLAC3D, the surrounding rock stability is simulated, and the numerical calculation results of advanced pilot excavation method with different structural inclinations. The conclusion can be used for reference for the design and research of similar tunnels.

Experimental Study on Highway Tunnel Surrounding Rock Reinforced by Small Pipe Pre-Grouting

2011 ◽  
Vol 250-253 ◽  
pp. 2617-2621
Author(s):  
Hai Bo Wang ◽  
Peng Ju Lu ◽  
Qi Zong
Keyword(s):  
Experimental Study ◽  
Rock Fracture ◽  
Deformation Monitoring ◽  
Surrounding Rock ◽  
Good Effect ◽  
Practical Applications ◽  
Highway Tunnel ◽  
Parameters Selection ◽  
Grouting Reinforcement ◽  
Mass Rock

Small pipe of staggered by length leading-drilling and grouting support technology was adopted for per-reinforcement of Lion-shaped Tunnel typeII rock, cement paste filled into loose rock mass rock fracture for adglutinate broken rock into a integrality, thus enhance the coherence and solidity of rock. Thesis introduced process flow of small pipe drilling grouting, grouting equipment, grouting parameters selection and practical applications. Through tunnel deformation monitoring and analysis, grouting reinforcement has achieved very good effect.

Surrounding Rock Classification in Deep Roadway of Coal Mine

2011 ◽  
Vol 181-182 ◽  
pp. 242-246 ◽  
Author(s):  
Bin Liu ◽  
Quan Sheng Liu
Keyword(s):  
Coal Mine ◽  
Surrounding Rock ◽  
Support Design ◽  
Geological Investigation ◽  
Rock Classification ◽  
Rock Stability ◽  
Mining Depth ◽  
Deep Rock ◽  
Ground Stress ◽  
The Stability

With the increase of mining depth，most coals in China have been deep mining stage. Compared to the shallow roadway, the characteristics of deformation-failure of surrounding rock show significant differences in the deep roadway, and the deep rock features of the surrounding rock are not considered in the traditional classification of roadway. So it is needed that systematical study on the surrounding rock classification for the stability evaluation of the deep roadway to meet the demand of the support design and the construction of the deep roadway in coal mine of China. The paper puts forward classification system of surrounding rock in deep roadway of coal mine according to on-the-spot geological investigation, rock ultrasonic testing, in-situ ground stress testing and comprehensive analysis on the surrounding rock stability of deep roadway in typical ore area.

Back Analysis on Tunnel Rheological Parameters

2013 ◽  
Vol 405-408 ◽  
pp. 1227-1230
Author(s):  
Qiang Huang
Keyword(s):  
Neural Network ◽  
Strain Field ◽  
Back Analysis ◽  
Field Monitoring ◽  
Surrounding Rock ◽  
Monitoring Data ◽  
Rheological Parameters ◽  
Tunnel Excavation ◽  
Highway Tunnel ◽  
The Difference

The surrounding rock strain field monitoring have been done during a highway tunnel excavation. The rock rheological parameters was inversed by neural network based the field monitoring data. The predicted value and the field monitoring data have been compared, the result shows that the difference is 12%, the predicted value is credible.

scholarly journals Analysis of Tunnel Water Inrush Considering the Influence of Surrounding Rock Permeability Coefficient by Excavation Disturbance and Ground Stress

2021 ◽  
Vol 11 (8) ◽  
pp. 3645
Author(s):  
Helin Fu ◽  
Pengtao An ◽  
Long Chen ◽  
Guowen Cheng ◽  
Jie Li ◽  
...  
Keyword(s):  
Permeability Coefficient ◽  
Water Pressure ◽  
Water Inrush ◽  
Surrounding Rock ◽  
Water Inflow ◽  
Calculation Error ◽  
External Water Pressure ◽  
Ground Stress ◽  
External Water ◽  
Inflow Prediction

Affected by the coupling of excavation disturbance and ground stress, the heterogeneity of surrounding rock is very common. Presently, treating the permeability coefficient as a fixed value will reduce the prediction accuracy of the water inflow and the external water pressure of the structure, leading to distortion of the prediction results. Aiming at this problem, this paper calculates and analyzes tunnel water inflow when considering the heterogeneity of permeability coefficient of surrounding rock using a theoretical analysis method, and compares with field data, and verifies the rationality of the formula. The research shows that, when the influence of excavation disturbance and ground stress on the permeability coefficient of surrounding rock is ignored, the calculated value of the external water force of the tunnel structure is too small, and the durability and stability of the tunnel are reduced, which is detrimental to the safety of the structure. Considering the heterogeneity of surrounding rock, the calculation error of water inflow can be reduced from 27.3% to 13.2%, which improves the accuracy of water inflow prediction to a certain extent.

Field Monitoring of Surrounding Rock Stress in Tunnel Construction

2012 ◽  
Vol 170-173 ◽  
pp. 1735-1739
Author(s):  
Ying Na Dong ◽  
Qiang Huang
Keyword(s):  
Spatial Effect ◽  
Field Monitoring ◽  
Surrounding Rock ◽  
Tunnel Construction ◽  
Rock Stress ◽  
Vibrating Wire ◽  
Stress Variation ◽  
Stress Changes ◽  
Tunnel Diameter ◽  
Surrounding Rock Stress

The surrounding rock stress field monitor has been done in excavation by vibrating wire transducer. The field monitoring data are compared with numerical simulation results. The result shows: Vibrating wire transducer can record the stress variation of surrounding rock and support. Surrounding rock stress changes violently at every excavation step, such as lower bench excavation, the stress variation is mainly controlled by the spatial effect. When the distance from excavation face to the monitoring section is more than a tunnel diameter, the rock stress variation is mainly affected by time and it is relatively smooth and continuous.

scholarly journals Study on construction mechanics behavior of weak surrounding rock with four-lane highway tunnel

2018 ◽  
Author(s):  
Fujin Hou ◽  
Shucai Li ◽  
Xinzhi Li ◽  
Wenjiang Li ◽  
Qing Jiang ◽  
...  
Keyword(s):  
Surrounding Rock ◽  
Highway Tunnel ◽  
Construction Mechanics ◽  
Weak Surrounding Rock
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