Tunnel Prospecting Based on Integrated Interpretation of Geophysical Data: Xiangyun Tunnel, Yunnan Province, China

Chen, Lei; Fengkai, Zhang; Ren, Yuxiao; Xu, Xinji; Yang, Zhichao; Li, Ming

doi:10.2113/jeeg24.1.63

Cited by 18 publications

(4 citation statements)

References 12 publications

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“…In the first type, two geophones are located at the upper part of the receiving face, and the geophones in the second type are located at the lower part of the face. is observation system differs from the system proposed by Chen et al due to the location of the shot point and the geophones [34]. e surrounding rock conditions are unsatisfactory; hence, some places are not suitable for geophone installation.…”

Section: Seismic Methodsmentioning

confidence: 93%

“…ese factors make it challenging for a single detection method to provide a comprehensive understanding of geological bodies exhibiting complex features such as water-bearing fractures and water-bearing faults. erefore, previous studies have obtained more detailed information on geological properties by combining various methods [33][34][35]. is combined approach constitutes a simple, fast, and effective method for comprehensively modeling a geological body.…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive Ahead Prospecting of Tunnels in Severely Weathered Rock Mass Environments with High Water Inrush Risk: A Case Study in Shaanxi Province

Zhang

Geng

et al. 2020

Advances in Civil Engineering

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The ahead geological prospecting of severely weathered surrounding rock in a tunnel is challenging due to complex geological conditions. Hence, the best approach is to use a variety of geophysical exploration methods. In this study, we have applied seismic, electrical resistivity (ER), and transient electromagnetic (TEM) methodologies for ahead prospecting of the highly weathered and complex surrounding rock at the diversion tunnel of the Hongyan River to Stone River Water Transfer Project in Shaanxi Province, China. The seismic method was employed to detect structural information for an area of 100 m from the front of the tunnel, the TEM method was used to obtain the resistivity information within 60 m, and the ER method was conducted to obtain detailed resistivity information over a range of 30 m. The integrated results generated a comprehensive interpretation of the geological body located within 100 m of the front of the tunnel. We divided this geological area into intact, severely weathered, and slightly weathered sections. Information on the water content of each section was also produced. The results of subsequent excavations are consistent with our results, proving the effectiveness and feasibility of a comprehensive approach for analyzing highly weathered and complex surrounding rock.

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Section: Seismic Methodsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Comprehensive Ahead Prospecting of Tunnels in Severely Weathered Rock Mass Environments with High Water Inrush Risk: A Case Study in Shaanxi Province

Zhang

Geng

et al. 2020

Advances in Civil Engineering

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“…However, when confronted adverse geology, TBM has a low adaptability and is prone to disaster, so predicting the distribution of geological conditions and adverse geology (faults, fractured zones, karst caves, etc.) in front of the tunnel face is crucial for construction safety [3][4][5][6][7][8][9][10]. What's more, the dense equipment and limited space inside the TBM put forward higher requirements for ahead-prospecting inside the TBM.…”

Section: Introductionmentioning

confidence: 99%

Double-shield TBM Mounted Seismic Ahead-prospecting System and its Application

Chen,

Li,

et al. 2024

Preprint

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Double-shield tunnel boring machine (TBM) has been widely used in tunnel construction. However, the unknown adverse geological conditions in front of the tunnel face can easily disturb the construction progress of the double-shield TBM. To ensure the construction safety of double-shield TBM, it is necessary to predict the geological information in front of the tunnel face in advance. However, the unique tunnel environment with a double-shield TBM makes it hard to predict geological conditions by conventional detection techniques. Therefore, this paper proposes a double-shield TBM-mounted seismic ahead-prospecting system. According to the special structure of double-shield TBM, a geological detection system mainly including the vibration source and rod-sensing elements was developed. The mounted vibration source is excited by high-pressure gas, and the excited seismic signal has strong energy, which can realize long-distance disaster prospection. The rod-sensing element can directly contact the surrounding rock mass through the grouting hole and collect reflected wave signals with a higher signal-to-noise ratio. The system can directly excite and receive seismic waves in the rock mass around the tunnel. The proposed system has been mounted on double-shield TBMs and verified based on field.

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“…With the expanding Chinese economy, many tunnels are being designed and constructed. However, when tunneling in hazardous geologic terrain, with faults, fractures, water-bearing openings, and other adverse geological conditions, construction safety is seriously endangered [1]. The ahead geophysical prospecting method is the main good method to ensure the safety of tunnel construction.…”

Section: Introductionmentioning

confidence: 99%

Frequency Domain Full Waveform Inversion Method of Acquiring Rock Wave Velocity in Front of Tunnels

et al. 2021

Self Cite

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Ahead geological prospecting, which can estimate adverse geology ahead of the tunnel face, is necessary in the process of tunnel construction. Due to its long detection range and good recognition effect on the interface, the seismic method is widely used in tunnel ahead prospecting. However, the observation space in tunnels is quite narrow compared to ground seismic prospecting, which leads to some problems in the acquisition of wave velocity, including: the velocity of the direct wave is used to replace the wave velocity of the forward rock approximately; the arrival time information of seismic waves is the main factor in time-travel inversion or the tomography method, which is sufficient to provide a simple model rather than deal with complex geological conditions. In view of the above problems, the frequency domain full waveform inversion method in ground prospecting is introduced to tunnel seismic prospecting. In addition, the optimized difference format is given according to the particularity of the tunnel environment. In this method, the kinematics and dynamics of the seismic wavefield are fully used to obtain more accurate wave velocity results. Simultaneously, forward modeling and inversion simulations on tunnel samples with typical adverse geological bodies are given here, which verified the validity and reliability of the proposed method.

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Tunnel Prospecting Based on Integrated Interpretation of Geophysical Data: Xiangyun Tunnel, Yunnan Province, China

Cited by 18 publications

References 12 publications

Comprehensive Ahead Prospecting of Tunnels in Severely Weathered Rock Mass Environments with High Water Inrush Risk: A Case Study in Shaanxi Province

Comprehensive Ahead Prospecting of Tunnels in Severely Weathered Rock Mass Environments with High Water Inrush Risk: A Case Study in Shaanxi Province

Double-shield TBM Mounted Seismic Ahead-prospecting System and its Application

Frequency Domain Full Waveform Inversion Method of Acquiring Rock Wave Velocity in Front of Tunnels

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