Aug 2026· Applied Sciences· Vol 16, pp. 8298· 0 citations· 41 references
Abstract
Accurate characterization of rock anisotropy is crucial for underground engineering stability assessment. In this study, multi-directional drilling tests were performed on sandy mudstone and argillaceous sandstone, with real-time monitoring of feed force (F), torque (M), rotational speed (n), power (P), drilling velocity (v), and depth (h). Drilling-derived apparent friction angles (φ) in different directions were estimated using a force-equilibrium-based model. Based on drill bit geometry, an energy balance model for hollow drilling was developed, and a unit grinding energy (ηe) was derived. A preliminary drilling-derived anisotropy index (Bφ−ηe), based on the coefficient of variation (CV) and integrating φ and ηe, was proposed. Results show a strong linear correlation between thrust force and torque, both exhibiting a two-stage increase with drilling depth. For the tested drilling orientations, the anisotropy determined using the proposed method decreases in the following order: sandy mudstone 1, sandy mudstone 2, argillaceous sandstone 2, and argillaceous sandstone 1. The proposed index provides a preliminary basis for evaluating directional variations in rock anisotropy.
Improving drilling performance in hard formations remains a key challenge for mining, geothermal, carbon storage, and petroleum applications. This study experimentally investigates the effect of axial compliance, introduced through a Belleville spring stack above the drill bit, on rotary drilling performance, compared...
Ibrahim Futheiz, A. Abugharara, Jian-Ming Yang et al.· Applied Sciences· 0 citations
Percussive-rotary drilling is widely used for excavation in hard rock massifs, yet it suffers from high energy consumption and low efficiency. This study presents a comprehensive assessment of energy consumption in percussive-rotary drilling based on specific fracture energy as the key metric. Laboratory experiments...
Ratov Boranbay, O. Pashchenko, V. Rastsvietaiev et al.· E3S Web of Conferences· 0 citations
The following abbreviations are used: acoustic borehole televiewer (ABI40), uniaxial compressive strength (UCS), factor of safety (FoS), two-dimensional finite-element program RS2, and three-dimensional finite-element program RS3. The stability of deep open-pit slopes is governed by structural heterogeneity, rock-stren...
Z. Assanova, D. Kaumetova, B. Khussan et al.· Engineer· 0 citations
Built-in multi-sensor measurement-while-drilling (MWD) modules on roof bolters can record torque, thrust, rotational speed, and displacement during drilling. This study examines whether identical rock types produce consistent MWD responses when tested through different boreholes in separate composite specimens. Three l...
Jian-Ju Ren, Yu-Xiang Li, Xin Yan et al.· Italian National Conference...· 0 citations
Deep tunnelling, mineral extraction and geothermal development increasingly encounter high-temperature rock masses whose thermal damage changes strength, deformation, fracture behaviour and the response of mechanical rock-breaking systems. This study investigates the evolution characteristics and energy mechanisms of r...
Reliable characterization of rock-mass deformability is essential for rock-supported infrastructure. This study combined six in situ rigid bearing plate tests with two-dimensional discrete element method (DEM) simulations implemented in Particle Flow Code (PFC2D) to investigate basalt deformation and energy evolution a...
