In Situ Test and Mechanical Analysis of Multi-Arch Tunnel with Large Section in Soft and Weak Rock Mass

2011 ◽  
Vol 250-253 ◽  
pp. 1262-1265
Author(s):  
Tong Liu ◽  
Zi Chao Dong ◽  
Hai Yong Yang
Keyword(s):  
Research Work ◽  
Safety Monitoring ◽  
Mechanical Analysis ◽  
Surrounding Rock ◽  
Monitoring Data ◽  
Engineering Practice ◽  
Construction Monitoring ◽  
Construction Methods ◽  
Information Construction ◽  
Weak Rock Mass

According to the characteristic of multi-arch highway tunnel,based on a practice engineering, the monitoring work was consisted of four sections:the displacement of surrounding rock; such as crown settlement, displacement of the ground, displacement of inner surrounding rock; that of stress and stain of support structure; that of force in middle-wall. In course of construction,monitoring data was analyzed in time.Structural timbering parameters were modified in response to abnormal monitoring data in order to guarantee safety.the testing results of the safety monitoring system are satisfactory, which serves as a symbol of our research work. Thus, our engineering practice has proved the applicability and feasibility of the safety monitoring and information construction methods.

scholarly journals Analysis of Construction Monitoring and Control of Tunnels Crossing Broken Faults and Water-rich Geology

2022 ◽  
Vol 2152 (1) ◽  
pp. 012019
Author(s):  
Jingang Fang
Keyword(s):  
Surrounding Rock ◽  
Monitoring Data ◽  
Monitoring And Control ◽  
Tunnel Engineering ◽  
Construction Monitoring ◽  
Construction Methods ◽  
The Poor ◽  
Secondary Lining ◽  
The Stability ◽  
And Control

Abstract In view of the poor geology such as tunnel engineering crossing faults or passing faults, the construction of surrounding rock and support is complicated. During construction, it is necessary to ensure the stability of the surrounding rock and supporting system, and ensure the timing of the secondary lining construction. For this reason, through the analysis and processing of monitoring data, the law of stratum change is mastered, and the supporting parameters and construction methods are adjusted and revised at the same time, so as to provide the best information for the tunnel surrounding rock and supporting lining construction.

scholarly journals Roof Failure Mechanism and Control Technology of Large Section Open-Off Cut in Soft Rock Strata with Thin Thickness

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Chen Li ◽  
Jun Li ◽  
Xiaoyong Lian ◽  
Yongen Li ◽  
Qi Xue ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Failure Mechanism ◽  
Underground Mining ◽  
Soft Rock ◽  
Mechanical Analysis ◽  
Field Monitoring ◽  
Surrounding Rock ◽  
Engineering Practice ◽  
Control Effect ◽  
Rock Strata

The open-off cut is used for equipment installation of working face before underground mining, and its sectional size is larger than that of the mining roadway. Therefore, the stability of open-off cut surrounding rock determines whether the panel can be put into operation. To solve the roof instability of open-off cut in the Wanli No.1 coal mine, the roof failure mechanism of open-off cut under weak composite rock strata with thin thickness was studied by field monitoring, theoretical analysis, and numerical simulation. First, the characteristics of surrounding rock and the basic law of strata behaviors were obtained by detailed field monitoring. Afterward, FLAC3D numerical simulation and mechanical analysis were used to obtain the main mechanical control parameters of surrounding rock instability, and the existence of a soft interlayer above the roof is the main cause of roof instability. Based on this, the supporting parameters of the open-off cut were optimized and adjusted. The optimized parameters were applied to the adjacent 31207 open-off cut. The engineering practice showed that the optimized supporting parameters have an ideal control effect on roof stability.

A Discussion on the Whole-Life Monitoring Mode of Large Bridge from Construction to Operation

2012 ◽  
Vol 178-181 ◽  
pp. 2479-2485
Author(s):  
Jian Ting Zhou ◽  
Yue Chen ◽  
Shan Huang
Keyword(s):  
Monitoring System ◽  
Collaborative Work ◽  
Monitoring Data ◽  
Engineering Practice ◽  
Construction Monitoring ◽  
Health Monitoring System ◽  
Monitoring Model ◽  
Data Dependence Analysis ◽  
New Ideas ◽  
Time Correction

Considering that the health monitoring system and construction monitoring system are not combined flexibly, the whole life monitoring model is conceived. That method is based on data dependence analysis of pre-buried and table-posted sensor, at the same time, correction of monitoring data is also taken into consideration. All the works focus on the research about collaborative work mode of monitoring data from pre-buried and table-posted sensor. This achievement brings so many benefits, firstly, it makes dead loads and living loads are considered together. Secondly, it brings new ideas to guarantee the safety of large bridges in construction or operation. Thirdly, the research results are embodied fully in the engineering practice of Nujiang Bridge.

scholarly journals Optimization Analysis of Smart Steel-Plastic Geogrid Support for Tunnel

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
Qin Liu ◽  
Jiankun Guo ◽  
Lei Liu ◽  
Kunpeng Huang ◽  
Wei Tian ◽  
...  
Keyword(s):  
Coming Out ◽  
Surrounding Rock ◽  
Coordination Mechanism ◽  
Structural Deformation ◽  
Engineering Practice ◽  
Monitoring Methods ◽  
Discrete Curvature ◽  
Construction Methods ◽  
Potential Safety ◽  
Tunnel Monitoring

With the concept of smart geogrid coming out, many scholars have built optical fiber into the geogrid to form a kind of smart geogrid material with self-sensing function of structural deformation. It can not only reinforce the parts with potential safety hazards, but also have the functions of safety monitoring, intelligent prevention, and control of engineering disasters, which is of great significance for ensuring the safety of tunnel construction and improving the tunnel monitoring methods. Based on predecessors’ research on smart geogrid tensile calibration experiment and sensor method simulation and experimental verification, this paper analyzes the smart geogrid and the tunnel surrounding rock as a whole, to study the deformation coordination mechanism between the geogrid material and the tunnel surrounding rock. Referring to the relevant engineering practice case, through finite element numerical simulation, the optimal layout of smart geogrid material was explored, and the principle of discrete curvature reconstruction curve sensing of smart geogrid was optimized by simulating the working conditions of different construction methods and supporting conditions, in order to provide a theoretical basis for the application of smart geogrid material in practical tunnel engineering.

The Construction Monitoring and Data Analysis of the Zhang JiaQu Tunnel

2013 ◽  
Vol 405-408 ◽  
pp. 1355-1359
Author(s):  
Hai Xia Ao ◽  
Yue Zhang
Keyword(s):  
Data Analysis ◽  
Surrounding Rock ◽  
Monitoring Data ◽  
Construction Time ◽  
Construction Monitoring ◽  
Stability Of Surrounding Rock ◽  
Secondary Lining ◽  
The Stability

The monitoring measurement on-site, which monitors the stability of surrounding rock and tests the rationality of design, is an indispensable mean. In the process of construction, the Zhang Jiaqu tunnel is open, by monitoring the whole section, guiding and determining the construction time of secondary lining and mastering the working state of primary supporting. This paper introduces the main content of monitoring measurement and analyzes the monitoring data, so as to provide the reference for similar projects.

scholarly journals Stability Control of Deep Coal Roadway under the Pressure Relief Effect of Adjacent Roadway with Large Deformation: A Case Study

2021 ◽  
Vol 13 (8) ◽  
pp. 4412
Author(s):  
Houqiang Yang ◽  
Nong Zhang ◽  
Changliang Han ◽  
Changlun Sun ◽  
Guanghui Song ◽  
...  
Keyword(s):  
Large Deformation ◽  
Coal Mine ◽  
High Stress ◽  
Surrounding Rock ◽  
Western China ◽  
Engineering Practice ◽  
Pressure Relief ◽  
Coal Roadway ◽  
And Control ◽  
Relief Effect

High-efficiency maintenance and control of the deep coal roadway surrounding rock stability is a reliable guarantee for sustainable development of a coal mine. However, it is difficult to control the stability of a roadway that locates near a roadway with large deformation. With return air roadway 21201 (RAR 21201) in Hulusu coal mine as the research background, in situ investigation, theoretical analysis, numerical simulation, and engineering practice were carried out to study pressure relief effect on the surrounding rock after the severe deformation of the roadway. Besides, the feasibility of excavating a new roadway near this damaged one by means of pressure relief effect is also discussed. Results showed that after the strong mining roadway suffered huge loose deformation, the space inside shrank so violently that surrounding rock released high stress to a large extent, which formed certain pressure relief effect on the rock. Through excavating a new roadway near this deformed one, the new roadway could obtain a relative low stress environment with the help of the pressure relief effect, which is beneficial for maintenance and control of itself. Equal row spacing double-bearing ring support technology is proposed and carried out. Engineering practice indicates that the new excavated roadway escaped from possible separation fracture in the roof anchoring range, and the surrounding rock deformation of the new roadway is well controlled, which verifies the pressure relief effect mentioned. This paper provides a reference for scientific mining under the condition of deep buried and high stress mining in western China.

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

2011 ◽  
Vol 90-93 ◽  
pp. 2307-2312 ◽  
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 ◽  
Stability Of Surrounding Rock ◽  
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.

Back Analysis for Mass Parameters of Tunnel Surrounding Rock

2012 ◽  
Vol 170-173 ◽  
pp. 20-24 ◽  
Author(s):  
Kai Cui ◽  
Xue Kai Pan
Keyword(s):  
Deformation Mechanism ◽  
Strain Softening ◽  
Back Analysis ◽  
Surrounding Rock ◽  
Tunnel Engineering ◽  
Railway Tunnel ◽  
Displacement Back Analysis ◽  
Information Construction ◽  
Engineering Information ◽  
The Common

Tunnel engineering information construction has been widely used, and the back analysis is its core. As the common useful method, displacement back analysis is of special advantages. This paper introduces the calculative method based on the application in a railway tunnel. The result shows that strain softening model can be used to simulate the large deformation mechanism of surrounding rock.

scholarly journals Analytical Solution of a Circular Opening considering Nonuniform Pressure and Its Engineering Application

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Peng Wu ◽  
Yanlong Chen ◽  
Liang Chen ◽  
Xianbiao Mao ◽  
Wei Zhang
Keyword(s):  
Analytical Solution ◽  
Plastic Zone ◽  
Young’S Modulus ◽  
Lateral Pressure ◽  
Young's Modulus ◽  
Pressure Coefficient ◽  
Surrounding Rock ◽  
Engineering Practice ◽  
Circular Opening ◽  
Lateral Pressure Coefficient

Based on the Mohr–Coulomb criterion, a new analytical solution of a circular opening under nonuniform pressure was presented, which considered rock dilatancy effect and elastic-brittle-plastic failure characteristics. In the plastic zone, the attenuation of Young’s modulus was considered using a radius-dependent model (RDM), and solution of the radius and radial displacement of plastic zone was obtained. The results show that many factors have important impact on the response of the surrounding rock, including lateral pressure coefficient, dilation coefficient, buried depth, and Young’s modulus attenuation. Under nonuniform pressure condition, the distribution of plastic zone and deformation around the opening show obvious nonuniform characteristic: with the increasing of lateral pressure coefficient, the range of plastic zone and deformation decrease gradually at side, while they increase at roof and floor, and the location of the maximum value of support and surrounding rock response curve transfers from side to roof. Based on the analytical results and engineering practice, an optimization method of support design was proposed for the circular opening under nonuniform pressure.

scholarly journals Analysis for full face mechanical behaviors through spatial deduction model with real-time monitoring data

2021 ◽  
pp. 147592172110448
Author(s):  
Xuyan Tan ◽  
Yuhang Wang ◽  
Bowen Du ◽  
Junchen Ye ◽  
Weizhong Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Analysis ◽  
Data Driven ◽  
Monitoring Data ◽  
Tunnel Structure ◽  
Mechanical Behaviors ◽  
Proposed Model ◽  
Full Face ◽  
Cross Test ◽  
Mechanical Constraint

Mechanical analysis for the full face of tunnel structure is crucial to maintain stability, which is a challenge in classical analytical solutions and data analysis. Along this line, this study aims to develop a spatial deduction model to obtain the full-faced mechanical behaviors through integrating mechanical properties into pure data-driven model. The spatial tunnel structure is divided into many parts and reconstructed in a form of matrix. Then, the external load applied on structure in the field was considered to study the mechanical behaviors of tunnel. Based on the limited observed monitoring data in matrix and mechanical analysis results, a double-driven model was developed to obtain the full-faced information, in which the data-driven model was the dominant one and the mechanical constraint was the secondary one. To verify the presented spatial deduction model, cross-test was conducted through assuming partial monitoring data are unknown and regarding them as testing points. The well agreement between deduction results with actual monitoring results means the proposed model is reasonable. Therefore, it was employed to deduct both the current and historical performance of tunnel full face, which is crucial to prevent structural disasters.

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