Prediction of karst for tunnelling using fuzzy assessment combined with geological investigations

Zhang, Kai; Tannant, Dwayne D.; Zheng, Wenbo; Chen, Shougen; Tan, Xinrong

doi:10.1016/j.tust.2018.06.009

Cited by 55 publications

(26 citation statements)

References 25 publications

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“…e fuzzy comprehensive evaluation is a significant method which can be applied to address the issues with uncertain and fuzzy boundary and has been widely used in fuzzy mathematics [26,27]. e fuzzy comprehensive evaluation method is improved and applied to establish an assessment system for ground stability in this research and the main work consists of the following parts: establishment of evaluation index system, establishment of index and evaluation sets, membership functions and membership matrix, weights distribution for evaluation indices, and fuzzy comprehensive evaluation matrix [28][29][30].…”

Section: Methodsmentioning

confidence: 99%

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Stability Assessment of Ground Surface along Tunnels in Karst Terrain Using Improved Fuzzy Comprehensive Evaluation

Zhang

Zhou

Chen

2021

Advances in Civil Engineering

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The stability of ground surface along tunnels in karst terrain is influenced by complex factors, among which the karst features are the significant ones. Under the influence of karst, the ground surface along tunnels is very easy to collapse, thus causing great casualties and economic losses. To provide guidance for maintaining the stability of ground surface along tunnels, an analysis system is proposed for assessing the stability of ground surface along tunnels in karst terrain based on an improved fuzzy comprehensive evaluation. Based on the case analysis of ground collapse along tunnels in karst terrain and the review of the related researches, the evaluation index system for ground surface stability assessment was established. The ridge-shaped membership functions were constructed to calculate the membership degree for the evaluation indices. The comprehensive weighting method combining the Fuzzy Analytical Hierarchy Process and correlation analysis was applied to determine weights for evaluation indices. And the ground surface stability level was recognized based on the maximum membership principle. The proposed assessment system was applied to assess the ground surface stability along the tunnels of Guiyang Metro Line 1, and the assessment results agreed well with the regional ground collapse history, verifying the effectiveness and reliability of the assessment system. Combining with the assessment results, a series of measures were conducted to promote the ground surface stability before tunnel excavation. This system provides a valuable tool for assessing and guiding to improve stability of the ground surface along tunnels in karst terrain.

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Section: Methodsmentioning

confidence: 99%

“…e subjective weights for evaluation indices are determined based on the FAHP proposed by Chang [43]. In FAHP, the triangular fuzzy number (TFN) in Table 2 is recommended to represent the relative importance scale between objects [30,44,45].…”

Section: Subjective Weightmentioning

confidence: 99%

Stability Assessment of Ground Surface along Tunnels in Karst Terrain Using Improved Fuzzy Comprehensive Evaluation

Zhang

Zhou

Chen

2021

Advances in Civil Engineering

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“…; Zhang et al . ). Although several papers address the problem of new TEM modelling (Lee and Buselli ; Zhdanov, Fang and Hursán ; Kozhevnikov and Antonov ; Guo et al .…”

Section: Introductionmentioning

confidence: 97%

Small fixed‐loop transient electromagnetic in tunnel forward geological prediction

Xia

Xue

et al. 2020

Geophysical Prospecting

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A B S T R A C TTunnel forward geological prediction is indispensable to tunnel construction. The transient electromagnetic method is widely used in the field of tunnel forward geological prediction. A small fixed-loop transient electromagnetic method adapted to the limited space of a tunnel face is proposed for tunnel forward geological prediction for the first time. This method makes use of a large number of non-central points inside the loop. The obtained numerical simulation and field data show opposite trends owing to mutual inductance and self-inductance. A correction method for the field value of non-central points is proposed. The influences of different parameters are verified and the correction function is established by a test method. The validity of the correction function is verified through controlled field tests. The small fixed-loop transient electromagnetic has been successfully applied to a tunnel under the Weiwu expressway. This method can effectively improve the detection depth and better detect unfavourable geological bodies, such as karsts in front of the tunnel face.At present, methods, for example a central loop, an overlapping loop, and other moving source devices, have been utilized by the tunnel seismic profiling for tunnel forward geological C

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“…Geophysical advance prediction in long-distance tunnels can reduce the risk of tunnel construction and prepare personnel safety prevention (e.g. Song et al, 2012;Zhang et al, 2018;Wang et al, 2019a). Reflection seismic method is one of the most effective advance prediction methods.…”

Section: Introductionmentioning

confidence: 99%

The tunnel seismic advance prediction method with wide illumination and a high signal‐to‐noise ratio

Liao

Wang

et al. 2020

Geophysical Prospecting

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Tunnel seismic prediction is widely used in the field of tunnel seismic advance detection. The illumination of the target and the signal‐to‐noise ratio of the data are two key factors affecting the precision of data interpretation. Current seismic prospecting has shortcomings on sites: (1) The lighting shots are solely towards one side of the tunnel wall, (2) the geophones are placed far away from the tunnel face and (3) the surface waves from the tunnel wall dominate over the reflection waves, lowering the signal‐to‐noise ratio of the data at the tunnel wall. This paper proposes a tunnel symmetrical geometry to tackle the above challenges. The arrangement is to place 12 sources uniformly on each side of the tunnel wall and six geophones on the tunnel wall and face. Results of simulated data and measured data show that the proposed method enables (1) broad illumination of the target body, (2) the enhancement of illumination energy of the target body, and (3) higher data signal‐to‐noise ratio. The proposed symmetrical geometry method provides better interpretation in terms of broader coverage, higher quality and greater distance of investigation.

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Prediction of karst for tunnelling using fuzzy assessment combined with geological investigations

Cited by 55 publications

References 25 publications

Stability Assessment of Ground Surface along Tunnels in Karst Terrain Using Improved Fuzzy Comprehensive Evaluation

Stability Assessment of Ground Surface along Tunnels in Karst Terrain Using Improved Fuzzy Comprehensive Evaluation

Small fixed‐loop transient electromagnetic in tunnel forward geological prediction

The tunnel seismic advance prediction method with wide illumination and a high signal‐to‐noise ratio

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