Cause and countermeasures for the symmetric effect in borehole-to-surface electrical resistivity tomography

Wang, Haoran; Lin, Chih‐Ping

doi:10.1016/j.jappgeo.2018.08.012

Cited by 12 publications

(12 citation statements)

References 23 publications

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“…Combining the two pieces of data forms the basis for the next configuration optimization, the comprehensive data set S c . Although Tsourlos et al have clearly pointed out that the in-hole data like AM configuration is not recommended [11], Wang and Lin believe that a balance should be struck between symmetric artifacts and resolution (however, they also exclude in-hole data) [12]. In the following content, the reason why we consider AM configuration will be explained.…”

Section: Methodsmentioning

confidence: 96%

“…It has to be noted that the pole-pole configuration was mainly discussed in this paper. Based on the configuration of A-M (A is located on the tunnel face, and M is located in the borehole) introduced by Wang and Lin [12], the AM configuration was additionally discussed (all electrodes are located in the borehole); these two kind of configurations are as shown in Figure 2. The A-M configuration can obtain 1,350 data, and the AM configuration can obtain a maximum of 435 data without considering the reciprocity of the electrodes.…”

Section: Methodsmentioning

confidence: 99%

“…However, due to the full use of the drilling space, this type of data is sensitive to the depth information of the anomaly and is necessary for ensuring the deep detection capabilities of BSERT. Therefore, Wang and Lin recommended to combine different configuration data in order to improve the inversion result [12]. To verify the conclusion in tunnel environment, a numerical test is conducted.…”

Section: Methodsmentioning

confidence: 99%

“…They proposed solutions based on data deletion and weighted inversion and to a certain extent solved the problem of symmetric artifacts of the BSERT. Wang and Lin believe that the highly symmetrical distribution of sensitivity is the cause of symmetric artifacts [12]. The balance between detection resolution and the intensity of symmetric artifacts is a key issue in the selection of configurations.…”

Section: Introductionmentioning

confidence: 99%

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Study of Tunnel-Face to Borehole ERI (TBERI) Measurement Configurations and Its Optimization

et al. 2021

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Most of the existing electrical-resistivity-based ahead prospecting methods in tunnel use only the tunnel cavity and tunnel face space to locate the water-bearing structures in front of the tunnel. However, due to the limitation of the narrow available space for arranging electrodes in tunnel, this kind of method is difficult to achieve more accurate image for water-bearing structures. The cross-hole electrical resistivity tomography (CHERT) and borehole-to-surface electrical resistivity tomography (BSERT) methods using borehole space have been proved effective means to achieve better images of deep anomalies on the surface. In this paper, the tunnel-face and borehole ERI (TBERI) method in tunnels was studied. To less affect the construction progress, the pole-pole configuration using a single borehole was studied in this paper. Moreover, the configuration is optimized based on the block weighted CR optimization strategy. After considering the data combination, an effective measurement configuration suitable for TBERI detection was formed. To accelerate calculation, some redundant data are removed from the obtained data after proposed block weighted optimization is conducted. By adopting the proposed configuration, the abnormal objects in the target area in the inversion are more accurate. The effectiveness of proposed configuration is verified by numerical simulation.

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Section: Methodsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of Tunnel-Face to Borehole ERI (TBERI) Measurement Configurations and Its Optimization

et al. 2021

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“…As the leakages grow deeper, the surface geophysical methods, though combined with other methods, do not work well, due to limited investigation depth and resolution; borehole approaches like borehole radar, borehole-to-surface electrical resistivity tomography and cross-hole seismic tomographic imaging become crucial choices, because borehole tools can closely approach targets [20,21]. A borehole radar system was initially developed for cross-hole radar tomography and was claimed to be useful for imaging the grouting sphere throughout the foundation rocks at dam construction sites; however, no practical leakage inspection has yet been reported [22].…”

Section: Introductionmentioning

confidence: 99%

Dam Leakage Detection by Borehole Radar: A Case-History Study

Liu

Wang

et al. 2019

Remote Sensing

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A borehole radar investigation was performed at the Sanzuodian reservoir, Chifeng, China to assess possible leakage paths located in the deep dam foundation. The key methodologies used include both single-hole reflection and cross-hole radar tomography, which make a high-resolution identification of the hydraulic connection paths between upstream and downstream sides possible. The leakage paths are characterized by direct wave loss due to high electromagnetic attenuation in the single-hole reflection profile and the nearly horizontal-banded low-velocity zone in the cross-hole velocity tomography due to possible large internal erosion. Meanwhile, some small structures inside the dam, including the core wall thickness changing point, the connecting point between asphalt and concrete walls, and the contacting interface between the dry and the water-saturated formations can be identified from the single-hole reflection profile clearly. Interpreted leakage paths are proven by the water flow measurement. Borehole radar is a useful high-resolution tool, suitable for deep leakage detection and evaluation.

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Water Inrush Detection in Limestone Pit Rock Walls Using Borehole-to-Surface ERT

Liu

et al. 2021

Mine Water Environ

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Cause and countermeasures for the symmetric effect in borehole-to-surface electrical resistivity tomography

Cited by 12 publications

References 23 publications

Study of Tunnel-Face to Borehole ERI (TBERI) Measurement Configurations and Its Optimization

Study of Tunnel-Face to Borehole ERI (TBERI) Measurement Configurations and Its Optimization

Dam Leakage Detection by Borehole Radar: A Case-History Study

Water Inrush Detection in Limestone Pit Rock Walls Using Borehole-to-Surface ERT

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