Study on Stability of Surrounding Rock of Mechanized Construction in Tunnel Entrance Section

Tunnel Entrance ◽

Design And Construction

Both of the stress field and deformation are unsymmetrical for shallow tunnel under unsymmetrical pressure and geological disaster such as collapse is easily to take place. This brings about troubling problems to both design and construction. In this paper, a case of Hongshigou tunnel is studied. Aiming at dealing with the problem of low buried and unsymmetrical pressure situation of tunnel entrance, a series of numerical studies has been done based on Flac3D, after analyzing the characterization of stress field, displacement field and plastic zones, conclusions are gained as follows:1) 2) These conclusions can provide beneficial reference to design and construction for tunnel engineering.

Hydro-Mechanical Coupled Analysis of the Stability of Surrounding Rock Mass of Underground Water-Sealed Oil Storage

10.4028/www.scientific.net/amm.405-408.402 ◽

2013 ◽

Vol 405-408 ◽

pp. 402-405 ◽

Cited By ~ 1

Author(s):

Yun Jie Zhang ◽

Tao Xu ◽

Qiang Xu ◽

Lin Bu

Keyword(s):

Rock Mass ◽

Underground Water ◽

Surrounding Rock ◽

Comsol Multiphysics ◽

Coupled Analysis ◽

Coupling Theory ◽

Oil Storage ◽

Straight Wall ◽

The Stability

Based on the fluid-solid coupling theory, we study the stability of surrounding rock mass around underground oil storage in Huangdao, Shandong province, analyze the stress of the surrounding rock mass around three chambers and the displacement change of several key monitoring points after excavation and evaluate the stability of surrounding rock mass using COMSOL Multiphysics software. Research results show that the stress at both sides of the straight wall of cavern increases, especially obvious stress concentration forms at the corners of the cavern, and the surrounding rock mass moves towards the cavern after excavation. The stress and displacement of the surrounding rock mass will increase accordingly after setting the water curtains, but the change does not have a substantive impact on the stability of surrounding rock mass.

Judgement Method for Surrounding Rock Stability of Guanjiao Tunnel Based on Catastrophe Theory

10.4028/www.scientific.net/amm.90-93.2307 ◽

2011 ◽

Vol 90-93 ◽

pp. 2307-2312 ◽

Cited By ~ 2

Author(s):

Wen Jiang Li ◽

Su Min Zhang ◽

Xian Min Han

Keyword(s):

Plastic Strain ◽

Catastrophe Theory ◽

Soft Rock ◽

Surrounding Rock ◽

In Situ Monitoring ◽

Engineering Practice ◽

The Stability ◽

Rock Tunnel

The stability judgement of surrounding rock is one of the key jobs in tunnel engineering. Taking the Erlongdong fault bundle section of Guanjiao Tunnel as the background, the stability of surrounding rock during construction of soft rock tunnel was discussed preliminarily. Based on plastic strain catastrophe theory, and combining numerical results and in-situ data, the limit displacements for stability of surrounding rock were analyzed and obtained corresponding to the in-situ monitoring technology. It shows that the limit displacements obtained corresponds to engineering practice primarily. The plastic strain catastrophe theory under unloading condition provides new thought for ground stability of deep soft rock tunnel and can be good guidance and valuable reference to construction decision making and deformation managing of similar tunnels.

Analysis of suspension bridge tunnel-type anchorage construction on the stability of surrounding rock

E3S Web of Conferences ◽

10.1051/e3sconf/202019802006 ◽

2020 ◽

Vol 198 ◽

pp. 02006

Author(s):

Nana Li ◽

Yongqiang Zhou ◽

Yanqiang Zhao ◽

Guiju Li

Keyword(s):

Suspension Bridge ◽

Surrounding Rock ◽

Construction Process ◽

Analysis Model ◽

Numerical Software ◽

Left And Right ◽

Simulation Results ◽

The Stability ◽

The Right

In order to study the interaction between the left and right tunnels of suspension bridge tunnel-type anchorage, the finite difference numerical software is used to analyze the mechanical properties of the surrounding rock during the construction process. A numerical analysis model based on FLAC3D is established to analyze the stress, displacement and plastic zone changes of the surrounding rock of right tunnel anchor cavern during the construction of left tunnel anchor cavern. The right tunnel anchor cavern is excavated firstly, and then the left tunnel anchor cavern is excavated. The numerical simulation results show that the main displacement of the right tunnel occurs in the construction stage of the anchor plug body and the rear anchor cavern of the left tunnel. During the excavation of the left tunnel, the plastic zones of the left and right tunnel anchor caverns are only connected above the middle of the waist wall. Therefore, it is suggested that during the construction process, especially in the excavation stage of the anchor plug body and the rear anchor cavern, the area above the middle of the tunnel waist wall should be strengthened in time to ensure the construction safety.

Study of Stability of Surrounding Rock and Structural Characteristics of Large Long Corridor Surge Chamber

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.912-914.774 ◽

2014 ◽

Vol 912-914 ◽

pp. 774-782

Author(s):

Jian Feng Yin

Keyword(s):

Finite Difference Method ◽

Plastic Zone ◽

Structural Characteristics ◽

Underground Structure ◽

Surrounding Rock ◽

Hydropower Station ◽

Unique Form ◽

Structure Form ◽

The Finite Difference Method

Large long corridor surge chambers have unique form. As a typical hydropower underground structure, its stability of surrounding rock in the process of excavation and force features of structure are affected by particular structure form. Take a hydropower station for example, by using the finite difference method, we simulated two different schemes in process of excavation and analyzed its displacement, stress, plastic zone of surrounding rock as well as force feature of structure. Appropriate law of large long corridor surge chamber during excavation is summarized which will provide the reference for the similar project.

A Case Study of Distress Detection and Treatment of Loess Road Tunnel

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.474-476.1787 ◽

2011 ◽

Vol 474-476 ◽

pp. 1787-1791

Author(s):

Jin Xing Lai ◽

Guang Long Zhang ◽

Xiao Wei Liu

Keyword(s):

Surrounding Rock ◽

Cost Estimate ◽

System Stability ◽

Road Tunnel ◽

Before And After ◽

Lining Structure ◽

Water Proof ◽

Slurry Injection

Based on the characteristic of distress in Qijia mountain road tunnel, thickness, cavity distribution, crevice water were detected with geo-radar. Material of lining was nondestructive detected with sound locater. Limiting structure of the tunnel was detected with circumscription apparatus. Based on detected results cause of the distress was analyzed. Three treatment schemes were put forward by slurry injection from the back of lining structure, reinforcement lining, treating the water proof system. Stability of surrounding rock and the state of forces of the lining structure were analyzed before and after treatment. It is showed that the treatment scheme of the tunnel is feasible. Taken construction and cost estimate into account, optimal scheme is obtained.

Numerical Simulation on Supporting of Deep Surrounding Rock with Zonal Disintegration Tendency

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.671-674.230 ◽

2013 ◽

Vol 671-674 ◽

pp. 230-234

Author(s):

Yu Jun Zuo ◽

De Kang Zhu ◽

Wan Cheng Zhu

Keyword(s):

Numerical Simulation ◽

Finite Element ◽

Surrounding Rock ◽

Zonal Disintegration ◽

Finite Element Software ◽

The Zonal Disintegration Phenomenon

Ground Stress ◽

Zonal Disintegration Phenomenon ◽

The Stability ◽

In order to study the supporting of deep surrounding rock with zonal disintegration tendency, the zonal disintegration phenomenon of deep surrounding rock under three supporting forms is analyzed by the ABAQUS finite element software in this paper, and three supporting forms are un-supporting, bolting and grouting, and combined “Bolting and grouting plus Anchor rope” supporting. The results show that the different effects to zonal disintegration under different supporting forms will occur. Supporting can help to restrain the zonal disintegration of the reinforcement part advantageously, and also lower rupture degree of zonal disintegration and reduce the size of rupture zone. Meanwhile, the stability of surrounding rock is improved. But zonal disintegration may occur outside reinforcement part under greater ground stress. The results are great importance to a better understanding of the deep roadway supporting.

Study on the Stochastic Law of Gob Stowing Effect

10.4028/www.scientific.net/amm.170-173.502 ◽

2012 ◽

Vol 170-173 ◽

pp. 502-505

Author(s):

Li Guo ◽

Bing Xie

Keyword(s):

Finite Element Method ◽

Ground Surface ◽

Surrounding Rock ◽

Stochastic Finite Element Method ◽

Confined Aquifer ◽

Ground Surface Settlement ◽

The Stability ◽

Statistical Rule ◽

Cut And Fill

The cut-and-fill mining is the main content of the technical system of green coal mining. And it is an effective way for solving the environmental problems and mining the coal under buildings, under railway, under water and over confined aquifer. No matter what kind of filling way, the gob stowing cannot achieve ideal filling effect, the filling effect is random in certain scope. Taking a coal mine as an example, with the aid of stochastic finite element method, the three situations of gob stowing were calculated and analyzed to explore the statistical rule of the ground surface settlement and the stability of surrounding rock because of random variation of gob stowing effect.

Study on the Deformation and Stability of Surrounding Rock

10.4028/www.scientific.net/amm.170-173.465 ◽

2012 ◽

Vol 170-173 ◽

pp. 465-469

Author(s):

Sheng Ji Jin ◽

Yong Qin Rui ◽

Zhe Shu

Keyword(s):

Nuclear Power ◽

Surrounding Rock ◽

Water Tunnel ◽

Plastic Deformation Zone ◽

Simulation Methods ◽

Surrounding Area ◽

Tunnel Excavation ◽

Working Face ◽

Numerical Simulation Methods

To rely on nuclear power plant water tunnel project, through the numerical simulation methods, we analysized the extent of rock deformation and stability of the process of excavation and supporting to reveal the deformation near the working face of rock tunnel.The research results show: When carrying out tunnel excavation, the plastic deformation zone in the horizontal direction perpendicular to the tunnel axis and the vertical downward direction are extended, the vault appears to sink, but also occurred in surface subsidence. Contrast the extent of tunnel excavation: The minimum extent is the tunnel axis perpendicular to the vertical downward, followed along the tunnel axis, the maximum extent is perpendicular to the direction of horizontal tunnel axis. Three kinds of excavation methods, a substantial volume reduction of sinking takes place in short steps and extra short steps excavation than the excavation of the top arch , and the surrounding area within the plastic is significantly reduced, which shows the smaller footage of the excavation the better control of the sinking of the crown.

Measurement and Research on Broken Zone of Surrounding Rock in Cha Zhen Tunnel

10.4028/www.scientific.net/amm.580-583.1321 ◽

2014 ◽

Vol 580-583 ◽

pp. 1321-1326

Author(s):

Rui Wang ◽

Yan Liang ◽

Wei Qin

Keyword(s):

Surrounding Rock ◽

Distribution Range ◽

Theoretical Base ◽

Elastic Plastic ◽

The Stability ◽

Plastic Theory

The use of the Analysis and calculation with elastic-plastic theory and Deep displacement of surrounding rock measurement determine the distribution range on broken zone of surrounding rock in Cha Zhen tunnel ; it verifies The stability of surrounding rock and the design rationality of bolting parameters ;Providing a theoretical base for the setting on broken zone of surrounding rock supporting parameters.