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<p>The Hangzhou–Shaoxing–Taizhou high-speed railway passes below the Xinchang Coal Mine, where the goaf is deeply buried. To scientifically evaluate the impact of the Xinchang Coal Mine goaf on the under-construction Hangzhou–Shaoxing–Taizhou high-speed railway and ensure the safety of engineering construction and railway operation, a comprehensive investigation of the Xinchang Coal Mine goaf was carried out using a combined method of geological survey, drilling, and geophysical exploration. Ground surveys identified two adit entrances (P1, P2) and a mine ventilation shaft (S1). Five transient electromagnetic (TEM) survey lines were arranged above the coal mine with a point spacing of 5&#xa0;m. The TEM data were finely processed, and the inversion parameters were verified. Borehole verification was conducted to validate the inferred abnormal areas, ensuring reliable results. A total of 18 goaf anomalies were identified. Among them, anomalies C1, C5, C8, and C11 are close to the tunnel, anomaly C16 is located directly above the tunnel, and the remaining anomalies are situated farther away from the tunnel. No water inflow was detected by either geophysical exploration or drilling, confirming the absence of mine water. Finally, the stability of the goaf was evaluated. Calculation and analysis indicate that the duration of surface movement in the goaf was shorter than the mine’s operation period, with a maximum subsidence of approximately 3.99&#xa0;m in the surface deformation zone. The coal mine goaf is located 39&#xa0;m above the tunnel roof, which is greater than the tunnel’s safe roof thickness of 8.88&#xa0;m. Additionally, the tunnel surrounding rock is dense basalt with relatively intact rock mass. It is concluded that the Xinchang Coal Mine goaf has a relatively minor impact on the Hangzhou–Shaoxing–Taizhou high-speed railway.</p>

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Detection of the Goaf in Xinchang Coal Mine and its impact on Hangzhou–Shaoxing–Taizhou high-speed railway

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Yuancheng Zhao,
  • Xing Mao,
  • Baochun Li,
  • Ji’en Dong,
  • Shilei Song,
  • Peng Sun

摘要

The Hangzhou–Shaoxing–Taizhou high-speed railway passes below the Xinchang Coal Mine, where the goaf is deeply buried. To scientifically evaluate the impact of the Xinchang Coal Mine goaf on the under-construction Hangzhou–Shaoxing–Taizhou high-speed railway and ensure the safety of engineering construction and railway operation, a comprehensive investigation of the Xinchang Coal Mine goaf was carried out using a combined method of geological survey, drilling, and geophysical exploration. Ground surveys identified two adit entrances (P1, P2) and a mine ventilation shaft (S1). Five transient electromagnetic (TEM) survey lines were arranged above the coal mine with a point spacing of 5 m. The TEM data were finely processed, and the inversion parameters were verified. Borehole verification was conducted to validate the inferred abnormal areas, ensuring reliable results. A total of 18 goaf anomalies were identified. Among them, anomalies C1, C5, C8, and C11 are close to the tunnel, anomaly C16 is located directly above the tunnel, and the remaining anomalies are situated farther away from the tunnel. No water inflow was detected by either geophysical exploration or drilling, confirming the absence of mine water. Finally, the stability of the goaf was evaluated. Calculation and analysis indicate that the duration of surface movement in the goaf was shorter than the mine’s operation period, with a maximum subsidence of approximately 3.99 m in the surface deformation zone. The coal mine goaf is located 39 m above the tunnel roof, which is greater than the tunnel’s safe roof thickness of 8.88 m. Additionally, the tunnel surrounding rock is dense basalt with relatively intact rock mass. It is concluded that the Xinchang Coal Mine goaf has a relatively minor impact on the Hangzhou–Shaoxing–Taizhou high-speed railway.