Experimental Study on Ground Pressure Control Mechanism in Continuous Mining of Gently Inclined Thin Veins

doi:10.12068/j.issn.1005-3026.2025.20240082

Abstract

Abstract:

To address low productivity， high ore loss， and frequent rock hazards in traditional room-and-pillar and breasting mining methods for gently inclined thin veins， laboratory similarity experiments were conducted for multi-stope mining of gently inclined thin veins at Sandaogou gold mine using novel pre-stressed expandable pillars technology. Surrounding rock deformation， stress distribution， fracture evolution， and roof failure modes were analyzed under unsupported and pre-stressed expandable pillar-supported conditions. Results show that compared with the unsupported condition， the pre-stressed expandable pillars can reduce the roof deformation by approximately 44%， relieve stress release in shallow goafs， and mitigate stress concentration in deep strata/floor pillars. The surrounding rock only experiences local instability， effectively avoiding the sudden collapse of the roof. This provides theoretical support for the stability control of the surrounding rock during the continuous mining of gently inclined thin veins.

Key words: gently inclined thin vein, continuous mining, ground pressure control, expandable pillar, laboratory similarity experiment

CLC Number:

TD 355

Kun-meng LI, Zheng-rong LI, Zhi-peng XIONG, Yuan-hui LI. Experimental Study on Ground Pressure Control Mechanism in Continuous Mining of Gently Inclined Thin Veins[J]. Journal of Northeastern University(Natural Science), 2025, 46(10): 143-150.

Figures/Tables 11

Fig.1 Design and field application effect of continuous mining without ore pillar in gently inclined thin vein

Fig.2 Numerical model and monitoring design

Table 1 Mechanical parameters of rock samples with similarity materials

岩样	密度/(kg·m^-3)	抗压强度/MPa	弹性模量/GPa	抗拉强度/MPa
现场岩体	2 700	10.190	17.500	0.500
相似材料岩样目标值	1 800	0.102	0.175	0.005
相似材料岩样	1 800	0.116	0.165	0.008

Fig.3 Similar material proportioning experiment

Fig.4 Similarity structure design and load-bearing tests of expandable pillar models

Fig.5 Laboratory similar model excavation and monitoring design

Fig.6 Vertical displacement of stope roof at different mining stages

Fig.7 Vertical stress of stope roof at different mining stages

Fig.8 Stability characteristics of stope roof

Fig.9 Load-bearing capacity curves of expandable pillar

Fig.10 Final failure characteristics of overlying rock with expandable pillar support

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