Experimental Investigation of the Fracture Performance of Hard Rock with a Single Borehole by Using a Hydraulic Splitter

Zhou, Fangyue; Liu, Songyong; Huang, Ju; Cui, Song

doi:10.1007/s13369-021-05504-y

Cited by 3 publications

(1 citation statement)

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“…Liu et al [22] studied the rock breaking performance of rock specimens using a radial splitter and revealed the crack propagation during the rock breaking by numerical simulation approaches via AUTODYN code; besides, they concluded that the borehole margin, confining pressure, borehole depth, and borehole diameter are the main factors influencing on rock breaking. Zhou et al [23] experimentally investigated the fracture performance with a single borehole by using a hydraulic splitter, and they also studied the effect of the rock compressive strength, confining pressure, and borehole margin, and then they summarized the peak fracture pressure with the free surface is lower than that without the free surface. What is more, de Graaf and Spiteri [24] introduced a successful application case of the hydraulic splitting cylinder (that is, radial splitter) for breaking rock at the Goldfields KDC West Gold Mine in South Africa, and they proposed that the splitter becomes more effective once the second free face is presented; therefore, they thought that future work should concentrate on developing more effective techniques for creating an initial cut.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Preliminary In Situ Investigation on Roadway Excavation Using Static Expansion Mechanical Fracturing

Chen,

Li,

Zhao

et al. 2024

Advances in Civil Engineering

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This paper introduced a new nonexplosive roadway excavation method, combining the reserved free space technology and the static expansion mechanical fracturing technology, where the former is implemented by the gasbag, while the piston splitter is for the latter. The numerical model of roadway excavation was set up via PFC3D to investigate the mechanical fracturing performance, including the single-hole fracturing and the hole network fracturing. The results show that the reasonable hole margin is about 1.0–1.5 m, and the optimal column spacing of the hole network pattern is 1.0 m, after comprehensively analyzing the fracturing performance and the splitting force evolution. Moreover, the mechanical fracturing excavation method was applied to construct a parking chamber in the Kalatongke Mine, to preliminarily verify the feasibility of the static expansion mechanical fracturing technology. The in situ investigation results indicate that the excavation footage is about 0.8 m with the piston splitter when adopting a hole margin of 1.0–1.5 m. To sum up, the preliminary field application and the numerical simulation result both support the feasibility of mechanical fracturing, and the reasonable fracturing hole margin is about 1.0 m.

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Section: Introductionmentioning

confidence: 99%