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Centralized High-Density Electrical Method System: Technical Principle and Case Analysis

1. Principle of High-Density Electrical Resistivity Survey

The high-density apparent resistivity method is an array-based exploration system evolved from DC resistivity methods. By establishing an artificial electric field through strategically deployed electrodes, this technique measures spatial resistivity variations to infer subsurface geological structures. The system integrates vertical electrical sounding and horizontal profiling capabilities, enabling 2D resistivity imaging through advanced inversion algorithms.

Electrical Resistivity Survey

2. Technical Advantages

2.1 System Architecture

  • ​Power Module: 6600W adaptive output with ±10V self-potential compensation
  • ​Electrode Array: 120-channel synchronous control supporting 18 configurations
  • ​Data Acquisition: 24-bit ADC with 120dB dynamic range

2.2 Operational Benefits

  • ​Efficiency: Multi-configuration data collection with single electrode deployment
  • ​Accuracy: Real-time terrain compensation for slopes ≤45°
  • ​Depth Capacity: 100m exploration depth (Wenner configuration)

3. Field Application Specifications

ParameterSpecification
Maximum Power6600W DC-AC Conversion
Voltage Range0-48Vp-p Auto-Adjust
Data Acquisition120 points/minute
Operating Temp-20°C to +60°C

4. Engineering Case Study: Karst Detection

4.1 Project Overview

  • ​Location: Guilin, China (Karst terrain)
  • ​Configuration: Wenner array with 5m electrode spacing
  • ​Array Length: 135m (27 electrodes)

4.2 Data Interpretation

  • ​Karst Voids: High-resistivity anomalies (>800Ω·m)
  • ​Water-Filled Cavities: Low-resistivity zones (<150Ω·m)
  • ​Validation: 3 cavities located with <1.5m positional error

5. Operational Guidelines

  1. ​Electrode Deployment:
    • Ensure electrode-ground contact resistance <5kΩ
    • Avoid metallic interference within 10m radius
  2. ​Data Optimization:
    • Apply polarization compensation during continuous scanning
    • Use constraint inversion for complex strata interpretation

For more information on ERT and its applications, visit Geotech’s product page：

Geotech Products| Geotech Instrument Co., Ltd. (geotechcn.net)

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