Measurement and analysis of the internal displacement and spatial effect due to tunnel excavation in hard rock

Jian, Wang; Li, Erbing; Chen, Liang; Ju, Wang; Tan, Yuehu; Duan, Ji’an; Pu, Shikun; Gao, Lei; Han, Yi; Wang, Chuanle

doi:10.1016/j.tust.2018.11.001

Cited by 20 publications

(6 citation statements)

References 38 publications

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“…e BET is located in the Jiujing site of the Beishan area, which is located approximately 80 km northwest of Yumen City, Gansu Province, PR China. As shown in Figure 10 [19,20]. e surrounding rock of the BET is mainly granite with good integrity, except for the Shiyuejing Fault, and the rock of the BET is a typical hard rock with a uniaxial compressive strength above 190 MPa [20].…”

Section: Engineering Backgroundmentioning

confidence: 99%

“…As shown in Figure 10 [19,20]. e surrounding rock of the BET is mainly granite with good integrity, except for the Shiyuejing Fault, and the rock of the BET is a typical hard rock with a uniaxial compressive strength above 190 MPa [20]. e main unfavorable geology of the BET is the Shiyuejing Fault, which has an inclination of approximately 70-80°.…”

Section: Engineering Backgroundmentioning

confidence: 99%

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A Novel Contact Tunnel Profile Monitoring System: Concept and Application

Han

Gao

et al. 2020

Mathematical Problems in Engineering

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The displacement of the cross section directly reflects the stress state and stability of the surrounding rock and structure, so the monitoring of it is essential during the construction and operation of the tunnel and underground engineering, particularly under the conditions of earthquake and other geological disasters. This paper introduces a new contact tunnel profile monitoring system (TPMS) in detail that uses a tilt sensor and a displacement sensor as data acquisition devices. According to the relation between the sensing physical quantity and displacement change, the displacement calculation formulas of the tunnel cross section measuring points based on the two-dimensional plane coordinate system were deduced, and in order to eliminate the actual installation and positioning deviation of the monitoring system, the method of obtaining the optimal monitoring plane and converting coordinates of the measuring points was proposed, thus establishing the theoretical basis for the application of the TPMS. With the Beishan exploration tunnel (BET) in China as the test platform, the TPMS was successfully applied for long-term monitoring. The application experience showed that the TPMS can realize continuous monitoring, automatic collection and transmission of the monitoring data, remote access whenever necessary, without affecting the transportation in the tunnel, and high accuracy, which reaches 0.01 mm. This system provides a new simple and effective method with good generality and applicability for the deformation monitoring of the tunnel and underground engineering.

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Section: Engineering Backgroundmentioning

confidence: 99%

Section: Engineering Backgroundmentioning

confidence: 99%

A Novel Contact Tunnel Profile Monitoring System: Concept and Application

Han

Gao

et al. 2020

Mathematical Problems in Engineering

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“…Wu et al 24 analyzed the fracture characteristics of rocks with inverted U-shaped holes under uniaxial compression and found that five different types of cracks were present at the edge of the opening. Notably, the failure of tunnel surrounding rock occurs not only on the surface of the chamber but also deeper in the surrounding rock, 3,25 which is related to the stress and location. 26 Zhong et al 27 measured the deformation of the surrounding rock of a tunnel, and a dumbbell-like distribution of the compressive strain was observed in the region of the sidewall approximately 0.5r from the opening profile.…”

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confidence: 99%

Fracture evolution and fracture mechanism of tunnel surrounding rock: A case study based on laboratory tests and theoretical analysis

Xiao

Zhang

et al. 2023

Fatigue Fract Eng Mat Struct

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To explore the fracture characteristics and fracture mechanism of the surrounding rock of straight-walled arched tunnels, this study first carried out biaxial compression tests on rock samples and analyzed the disaster evolution characteristics under loading. Then, a stress distribution function was established using a complex function, and the distribution characteristics of the surrounding rock stress field were determined. Finally, combining the stress field with results obtained by computational tomography and acoustic emission measurements, the dynamic evolution of the main fracture mechanism of the tunnel surrounding rock was comprehensively analyzed, and the fracture mechanism of the surrounding rock of the straight-walled arched tunnel was elucidated. The research results strengthen the understanding of rock fracture evolution during tunnel construction and operation and provide a basis for tunnel construction and surrounding rock stability analysis. K E Y W O R D Sacoustic emission, complex function, fracture mechanism, surrounding rock Highlights• The biaxial compression test was carried out on rock samples.• The stress field of the surrounding rock is analyzed based on a complex function.• The fracture characteristics of the tunnel surrounding rock are elucidated. | INTRODUCTIONRock is the most common geological material encountered in engineering construction. During hydropower engineering, tunnel engineering, and mine engineering, numerous chambers or tunnels must be excavated. [1][2][3] The sectional shapes of these structures include round, rectangular, straight wall-round arch, horseshoe, and eggshell. [4][5][6][7] In particular, straight-walled arched tunnels are quite common. Although these tunnels have good spatial applicability and stability characteristics, onionlike peeling layer by layer, that is, plate cracking failure,

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“…Most researches employed multianchor borehole wire extensometers to perform real-time onsite monitoring on underlying strata subsidence over a large-scale gob. [15][16][17][18] Although this direct field monitoring test technology could provide intuitive and first-hand information on the movement of overlying strata, it is not always the best method because of high costs and long operating time. On the other hand, numerical simulation methods make it possible to predict and analyze strata movements by using numerical calculations.…”

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confidence: 99%

Subsurface strata failure and movement based for improving gas emission control: Model development and application

Cheng

Wang

Liu

et al. 2020

Energy Science & Engineering

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In underground mining operations, the overlying strata move, deform, and crack as the underground working face advances due to strata breakage, failure, and subsidence, forming a “vertical three zone” over the mined out area. The permeability of strata under mining changes differently in different zones. Therefore, studying the distribution of strata permeability is very important to obtain knowledge of gas migration pattern in the overlying strata in order to increase the gas extraction efficiency. In this study, a series of numerical models are developed to describe the overlying strata movement for three different zones. In detail, models for calculating the strata subsidence for fracture and bending zones and analyzing strata collapsing development for the caving zone are proposed based on the influence function method and mechanical analyses. In addition, on the basis of such models, a new comprehensive model to describe the strain‐porosity‐permeability of strata is developed. In the case study of applying such models in an underground mine, the reliability of the strata movement model is verified and the permeability change is also calculated, which gives a good guidance to design the location of gas drainage roadway practices in the future. The field engineering practice shows its good application.

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Measurement and analysis of the internal displacement and spatial effect due to tunnel excavation in hard rock

Cited by 20 publications

References 38 publications

A Novel Contact Tunnel Profile Monitoring System: Concept and Application

A Novel Contact Tunnel Profile Monitoring System: Concept and Application

Fracture evolution and fracture mechanism of tunnel surrounding rock: A case study based on laboratory tests and theoretical analysis

Subsurface strata failure and movement based for improving gas emission control: Model development and application

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