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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
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The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
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Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
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Data on performance and variation index for shield tunnelling through soft deposit.

Tao Yan1,2, Shui-Long Shen1,3, Annan Zhou2

  • 1Department of Civil and Environmental Engineering, College of Engineering, Shantou University, Shantou, Guangdong 515063, China.

Data in Brief
|July 26, 2021
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Summary

This study analyzes Earth Pressure Balance (EPB) shield machine performance in Tianjin Metro Line No. 5, detailing energy consumption and soil effects for efficient tunnelling in soft deposits.

Keywords:
Construction efficiencyEnergy consumptionParametersVariation index

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Area of Science:

  • Geotechnical Engineering
  • Tunnelling Technology
  • Civil Engineering

Background:

  • Shield tunnelling is crucial for urban infrastructure development, particularly in soft soil conditions.
  • Earth Pressure Balance (EPB) shield machines are widely used for tunnelling in challenging geological environments.
  • Understanding machine performance and energy consumption is vital for optimizing tunnelling operations.

Purpose of the Study:

  • To present and analyze field data from an EPB shield machine operating on Metro Line No. 5 in Tianjin, China.
  • To investigate the impact of soil properties (silt/clay, grain gradation) on shield machine performance and energy consumption.
  • To provide a dataset for evaluating construction efficiency in soft soil tunnelling.

Main Methods:

  • Collection of field performance data, including cutterhead rotation speed and torque, screw machine parameters, shield thrust, and advance rate.
  • Analysis of soil characteristics such as soil proportion and grain gradation.
  • Calculation and presentation of energy consumption and variation index R² during tunnelling.

Main Results:

  • Detailed field performance data for EPB shield machine components (cutterhead, screw machine, shield advancing).
  • Correlation between soil properties (silt/clay content, grain gradation) and machine performance metrics.
  • Quantification of energy consumption patterns and their relationship with tunnelling parameters and soil conditions.

Conclusions:

  • The presented dataset offers valuable insights into EPB shield machine behaviour in soft Tianjin soils.
  • Understanding these relationships is key to improving construction efficiency and reducing energy consumption in similar tunnelling projects.
  • The data serves as a foundation for further research and optimization of shield tunnelling operations.