In-situ monitoring and analysis on the stability of surrounding rock of Qiankeng tunnel

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.

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.

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.

Parabolic-Apex Numerical Back-Analysis of Mechanics Parameters of Surrounding Rock

10.4028/www.scientific.net/amm.204-208.196 ◽

2012 ◽

Vol 204-208 ◽

pp. 196-201 ◽

Cited By ~ 1

Author(s):

Jian Cong Xu ◽

Yi Wei Xu

Keyword(s):

Young’S Modulus ◽

Young's Modulus ◽

Pressure Coefficient ◽

Back Analysis ◽

Surrounding Rock ◽

In Situ Monitoring ◽

Monitoring Data ◽

3D Fem ◽

Physical Mechanics

The parabolic-apex numerical back-analysis method (PNBM) was proposed to obtain such physical-mechanics parameters as Young's modulus and lateral pressure coefficient of surrounding rock by 3D FEM numerical analysis based on in-situ monitoring data. Taking Xiang-an Subsea Tunnel (located in Xiamen, Fujian Province, China) for example, adopting the PNBM using ABAQUS software, three dimensional elastic-plastic FEM-PNBM of tunnel surrounding rock was validated using in-situ monitoring data. The results show as follows: Using the PNBM, not only may high calculation precision be obtained, better meeting the demand of actual projects, but also more reasonable and reliable physical mechanics indices of surrounding rock such as Young's modulus and lateral confinement pressure coefficient, may be obtained. The applicability and the simplicity of this proposed method also support its usefulness.

Study on Support of Roadways in Fractured Rock Mass under Mining-Induced Stresses

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.807-809.2332 ◽

2013 ◽

Vol 807-809 ◽

pp. 2332-2339

Author(s):

Qiang Wang ◽

Jin Yu Chen

Keyword(s):

Rock Mass ◽

Abutment Pressure ◽

Underground Mining ◽

Fractured Rock ◽

The State ◽

In Situ Monitoring ◽

Initial Stresses ◽

Induced Stresses ◽

The Stability

One of the difficult issues in underground mining is the ground control of roadway subject to mining induced stresses. As a longwall face advances, the state of initial stresses dramatically changes. Accordingly, lateral abutment pressure forms on the pillar and frontal abutment pressure on the roof and lateral sides of the roadway. These pressures will lead to severe deformation and deterioration of the rock mass surrounding the entries. In this paper, a systemic study on this issue is proposed using the combination of numerical modeling and in-situ monitoring which was carried out at a coal mine in the Lu.An Group, China. The condition of stress redistribution caused by mining-induced stresses and the state of the surrounding rock mass of the roadway situated in front the work face are systematically investigated. Different patterns of support and reinforcement as well as their effects on the stability of the roadway are also presented.

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.

Monitoring and Analysis on the Supporting Structure for Deep Foundation Pit

10.4028/www.scientific.net/amm.580-583.787 ◽

2014 ◽

Vol 580-583 ◽

pp. 787-790

Author(s):

Hai Xia Sun ◽

Ke Zhang ◽

Si Li Chen

Keyword(s):

In Situ Monitoring ◽

Monitoring Data ◽

Deep Foundation ◽

Foundation Pit ◽

Metro Station ◽

Deep Foundation Pit ◽

Supporting Structure ◽

Deformation Features ◽

The Stability

This article mainly expounds the importance of in-situ monitoring on the construction process of deep foundation pit. Taking the deep foundation pit of some Shenyang metro station for example, the deformation features of the supporting structure and the internal and external of foundation pit is analyzed, according to the monitoring data of the fender pile displacement during the excavation of deep foundation pit. The conclusion is obtained that the timely and accurate in-situ monitoring information is necessary to guaranteeing construction safety. We should pay more attention to the excavation speed and exert the interior support timely during the excavation of foundation pit to avoid large deformation and danger. The analytical results of monitoring data shows that the whole stage of foundation pit excavation is stable and the fender pile with internal supports can guarantee the stability of foundation pit.

Analytical Solution of Tunnel Surrounding Rock for Stress and Displacement Based on Lade–Duncan Criterion

Advances in Civil Engineering ◽

10.1155/2018/5363658 ◽

2018 ◽

Vol 2018 ◽

pp. 1-7 ◽

Cited By ~ 3

Author(s):

MingZheng Zhu ◽

Yugui Yang ◽

Feng Gao ◽

Juan Liu

Keyword(s):

Internal Friction ◽

Plastic Zone ◽

Yield Criterion ◽

Surrounding Rock ◽

Rock Stress ◽

Deformation And Failure ◽

Displacement Based ◽

The Stability ◽

Coulomb Criterion

The deformation and failure of tunnel surrounding rock is the result of tunnel excavation disturbance and rock stress release. When the local stress of surrounding rock exceeds the elastic limit of rock mass, the plastic analysis of surrounding rock must be carried out to judge the stability of tunnel. In this study, the Lade–Duncan yield criterion is used to calculate the analytic solutions for the surrounding rock in a tunnel, and the radius and displacement of the plastic zone are deduced using an equilibrium equation. The plastic zone radius and displacement based on Lade–Duncan criterion and Mohr–Coulomb criterion were compared by using single-factor analysis method under the different internal friction angles, in situ stresses, and support resistances. The results show that the solutions of the radius and displacement of plastic zone calculated by the Lade–Duncan criterion are close to those of Mohr–Coulomb criterion under the high internal friction angle and support resistance or low in situ rock stress; however, the radius and displacement of the plastic zone calculated by the Lade–Duncan criterion are larger under normal circumstances, and the Lade–Duncan criterion is more applicable to the stability analysis of the surrounding rock in a tunnel.

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.