Research on Surrounding Rock Deformation Control Technology for Shallow Tunnel with Extra Large Section

2020 ◽  
Vol 09 (01) ◽  
pp. 17-26
Author(s):  
子茂 王
Keyword(s):  
Surrounding Rock ◽  
Rock Deformation ◽  
Shallow Tunnel ◽  
Control Technology ◽  
Large Section ◽  
Deformation Control ◽  
Surrounding Rock Deformation

Concrete Crack Control Technology in Chongqing Inch Container Terminal Box Letter of Application in Engineering

2012 ◽  
Vol 217-219 ◽  
pp. 161-164
Author(s):  
Ya Nan Fu ◽  
Ze Ping He
Keyword(s):  
Container Terminal ◽  
Steel Corrosion ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Control Technology ◽  
Crack Control ◽  
Concrete Crack ◽  
Box Culverts ◽  
And Control ◽  
Surrounding Rock Deformation

This paper mainly introduces the main causes of the concrete cracks, and with Chongqing inch beach bonded port freight container terminal, drain tank letter concrete crack control as the engineering example, the paper analyzes the method of crack control. For example reduce water consumption, choose the narrow fly ash cement, reduce the narrow concrete constraint, and control the hydration heat, strengthen the concrete curing, control the steel corrosion of crack, control the box by letter of the surrounding rock deformation, they can be reached that box culverts basic don't crack effect.

scholarly journals Surrounding rock deformation control of asymmetrical roadway in deep three-soft coal seam: a case study

2018 ◽  
Vol 15 (5) ◽  
pp. 1917-1928 ◽  
Author(s):  
Wei Zhang ◽  
Ziming He ◽  
Dongsheng Zhang ◽  
Dahong Qi ◽  
Weisheng Zhang
Keyword(s):  
Coal Seam ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Deformation Control ◽  
Soft Coal ◽  
Soft Coal Seam ◽  
Surrounding Rock Deformation

Control Technology and Application for Surrounding Rock Deformation in T-Junction Area of Gob-Side Entry Retaining

2013 ◽  
Vol 838-841 ◽  
pp. 1873-1879 ◽  
Author(s):  
Chang Liang Han ◽  
Nong Zhang ◽  
Bao Yu Li
Keyword(s):  
Abutment Pressure ◽  
Main Roof ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Control Technology ◽  
Support Design ◽  
Junction Area ◽  
Pressure Zone ◽  
Stress Zone ◽  
Surrounding Rock Deformation

On the bases of theoretic analysis, numerical simulation, and project practice, stress distribution of surrounding rock and movement characteristics of roof strata in T-junction area of gob-side entry were analyzed. Besides, control technology in T-junction area was proposed after indicating deformation characteristics of different stages in gob-side entry. Results show that there is an inclined block in T-junction area after fracture of main roof and the period when the block is tending to stability is a critical stage of pressure appearance for gob-side entry. Further, three stress zones: in-situ stress zone, abutment pressure zone and low stress zone appear in both strike and dip of mining panel and enhanced support of gob-side entry before excavation should keep away from the abutment pressure zone, which also indicates that deep bolting support can exert the bearing capacity of deep rock mass. Additionally, the whole procedure of surrounding rock deformation can be divided into four stages and deformation in gob-side entry is larger than that of entry excavation, which means that efficient support design should be taken into account. Ultimately, district control technologies for surrounding rock of gob-side entry in back zone, filling zone, and front zone are proposed and it showed a good adaption in project practice of coalmine.

Mechanics Characteristic Analysis of Support Structure of Shallow-Buried Large-Section Loess Tunnel

2014 ◽  
Vol 926-930 ◽  
pp. 589-592
Author(s):  
Zhi Jie Sun
Keyword(s):  
Surrounding Rock ◽  
Rock Deformation ◽  
Structural Performance ◽  
Characteristic Analysis ◽  
3D Numerical Simulation ◽  
Large Section ◽  
Support Structure ◽  
Construction Methods ◽  
Mechanics Characteristic ◽  
Surrounding Rock Deformation

To research the mechanics characteristic of support structure of shallow-buried large section loess tunnel with different construction methods, 3D Numerical Simulation is applied and the large-section loess tunnel of highway is taken as an example. Comparing mechanics characteristic of support structure in three types of construction method conditions, the research results show that:The Benching stepping method which caused large surrounding rock deformation can reduce the value of structural performance. While the Both side heading is just opposite.

scholarly journals Application of Distributed Optical Fiber Sensing Technology in Surrounding Rock Deformation Control of TBM-Excavated Coal Mine Roadway

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Bin Tang ◽  
Hua Cheng
Keyword(s):  
Optical Fiber ◽  
Coal Mine ◽  
Time Domain Reflectometry ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Deformation And Failure ◽  
Deformation Control ◽  
Monitoring Techniques ◽  
Deformation Behaviors ◽  
Surrounding Rock Deformation

After roadway excavation, the deformation and failure of roadway surrounding rocks typically results in roadway damage or collapse. Conventional monitoring techniques, such as extensometers, stress meters, and convergence stations, are only capable to detect the stress or strain data with the shallow layers of surrounding rocks, and they require arduous manual works. Moreover, in the abovementioned monitoring techniques, the monitoring instruments are installed behind the excavation face; therefore, the strain and deformation occurring in front of excavation face cannot be detected. In order to eliminate these shortcomings, an innovative monitoring system for surrounding rock deformation control has been developed base on Brillouin optical time domain reflectometry. Compared with conventional monitoring systems, the proposed system provides a reliable, accurate, and real-time monitoring measure for roadway surrounding rock deformation control over wide extension. The optical fiber sensors are installed in boreholes which are situated ahead of the excavation face; therefore, the sensors can be protected well and the surrounding rock deformation behaviors can be studied. The proposed system has been applied within a TBM-excavated roadway in Zhangji coal mine, China. The surrounding rock deformation behaviors have been detected accurately, and the monitoring results provided essential references for surrounding rock deformation control works.

Analysis for Surrounding Rock Instability and Research for Stability Control Technology in Underground Engineering

2012 ◽  
Vol 170-173 ◽  
pp. 1367-1371 ◽  
Author(s):  
Xian Kai Bao ◽  
Yi Li
Keyword(s):  
Damage Mechanism ◽  
Stability Control ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Control Technology ◽  
Rock Damage ◽  
Underground Excavation ◽  
Underground Engineering ◽  
Surrounding Rock Deformation ◽  
Made In

Aiming at the surrounding damage and instability in underground excavation and operation, an analysis of surrounding rock damage modes and an exploration of damage mechanism are done and an conclusion of control principles and means for surrounding rock deformation and damage is made in the thesis. The result dovetailed with engineering and provides reference for engineering design and operation.

scholarly journals Research of the Surrounding Rock Deformation Control Technology in Roadway under Multiple Excavations and Mining

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Ming Su ◽  
Xiaohui Gao
Keyword(s):  
Coal Mine ◽  
Reference Value ◽  
Field Investigation ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Control Effect ◽  
Deformation Control ◽  
Bolt Stress ◽  
Advanced Support ◽  
Surrounding Rock Deformation

To effectively control the large surrounding rock deformation of the mining roadway under multiple excavations and mining in Wangcun coal mine, the field investigation, numerical simulation, field test, and monitoring were conducted, and the characteristics of stress and deformation evolution of the surrounding rock under the influence of multiple excavations and mining were analyzed; then the collaborative supporting technology of high prestressed bolt and short anchor cables was proposed in this study. The results show the following: (1) under the influence of multiple excavations and mining, the peak vertical stress of the typical air-return roadway reaches 23 MPa, and the deformation increases by about 2.8 times after the mining of adjacent panel. (2) The principle of the roadway support under the influence of multiple excavations and mining in Wangcun coal mine is determined; from the perspective of prestress, we can conclude that the active support of short anchor cables is better than that of long anchor cables. (3) Based on the results of the field monitoring, the bolt stress can be divided into four stages: the loss stage of prestress, the sudden-decrease stage of the roof periodic weighting, the decrease stage of advanced support, and the rapid-increase stage of strong disturbance. Due to the large anchorage range of anchor cables, there is no decrease stage of advanced support. After the application of prestress, the bolt stress of side bolts and top bolts decreases, and the reduction amplitude is up to 30 kN. (4) As the panel advances, the deformation of the surrounding roadway increases, and the growth rate is also increasing gradually. However, the final displacement of the roof, floor, and two sides is within 18 mm. The bolt and anchor cables are not broken, and the control effect is good. The research results have a certain reference value for similar roadway control.

scholarly journals Model Test and Numerical Study on Surrounding Rock Deformation and Overburden Strata Movement Law of Gob-Side Entry Retaining via Roof Cutting

Minerals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 458 ◽  
Author(s):  
Daoyong Zhu ◽  
Jiong Wang ◽  
Weili Gong ◽  
Zheng Sun
Keyword(s):  
Model Test ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Shanxi Province ◽  
Beam Model ◽  
Physical Test ◽  
Strata Movement ◽  
Deformation Equation ◽  
Surrounding Rock Deformation ◽  
Overlying Strata

The effects of roof cutting techniques on the movement law of the overlying strata and deformation features of the surrounding rock in gob-side entry retaining mines were studied using 200 working faces of the Dianping coal mine in Shanxi Province. Using a mechanical analysis, a cantilever beam model formed by roof cutting was used to derive a deformation equation. The physical model test based on the field prototype revealed an asymmetrically distributed displacement curve and reduced collapse displacement when the rock stratum was far from the cutting seam. Outside of the roof cutting height, the collapse of the overlying strata gradually reached a symmetric distribution with increasing height. The deformation of the retained roadway was mainly concentrated on the roof, and the maximum deformation was 14 mm near the roof cutting side. A numerical simulation of the original size of the model test proved that the laws of strata movement and surrounding rock deformation were consistent with the physical test results. Finally, field measurements were performed, which verified the rationality of this study.

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