Numerical simulation and analysis of drill rods vibration during roof bolt hole drilling in underground mines

Liu, Shaowei; Fu, Mengxiong; Jia, Housheng; Li, Wenbin; Luo, Yafei

doi:10.1016/j.ijmst.2018.05.018

Cited by 19 publications

(7 citation statements)

References 1 publication

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“…e ground vibration can be excited by many man-made sources of vibration, including construction actives (e.g., explosive blasting and pile driving), machines, hammers, and traffic loading [20]. During drilling, the rotation of bit and drilling string becomes the specific source of vibration [12,19]. Ground vibration will propagate through the ground in a form of seismic wave [11], which may cause stability issues of structure in vicinity [21].…”

Section: Stability Of Grouting Holesmentioning

confidence: 99%

“…Undoubtedly, resource recycling should be the most cost-effective method. Although a lot of attentions had been focused on conversion of the waste mud to cement materials in petroleum and gas industries in recent years [19], converting the waste drilling mud to available grouting materials is still rarely reported and an innovative attempt. For pregrouting in Chinese coal mine, there is always a large demand of man-made clay slurry to prepare the claycement (Cl-C) grouts.…”

Section: Resource Recycling Of Waste Drilling Mudmentioning

confidence: 99%

“…Ibrahim et al [12] presented mathematical models of longitudinal and torsional vibrations as well as the model coupling the two vibrations to help understand the entire force of drill-string and the displacement. Itakura et al [17] and Liu et al [18,19] reported the dependence of vibration on the rock properties. ey found that the measured vibrations can be employed to estimate the downhole geological conditions.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous Operations of Pregrouting and Shaft Drilling in Shaft Construction

Feng

et al. 2020

Advances in Civil Engineering

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In shaft construction, conducting shaft drilling and pregrouting simultaneously is expected to speed up the sinking rate and save the cost. Reasonable determination of the spatial locations of the drilled shaft and grouting holes and proper defining of the start time of each construction work are the crucial techniques. To smoothly execute the simultaneous operations, the bedrock to be grouted is divided into two sections. The upper bedrock is injected first using straight grouting holes to act as a tight cover to protect shaft drilling. Then, the lower formations are grouted using S-shaped grouting holes, which are performed simultaneously with shaft drilling. The construction time of simultaneous operations of pregrouting for the lower bedrock using S-shaped holes and shaft drilling is the saved time. The main technical challenges include the stability of grouting holes and safety of shaft walls, as well as the disposal of the contaminative waste drilling mud. The stability of grouting holes which might affect by the shaft drilling-induced ground vibration could be evaluated according to the penetration of ground vibration caused by TBM tunnelling. If the grouting hole is in the range of ground vibration, protective measures including casing and ground improvement should be utilized to ensure the stability of grouting holes. The stability of unlined walls of the drilled shaft caused by the increased groundwater pressure can be achieved by a tight cover between the drilled shaft and pregrouting holes. The thickness of the cover is actually the length of the straight holes. The cover should have sufficient thickness and impermeability, which can considerably reduce or even completely stop the increased groundwater pressure in vicinity of the drilled shaft. The thickness and permeability of the cover could be determined using Maag’s solution for penetration of grouts in porous media. On the other hand, the waste drilling mud with proper modifications can be reutilized to prepare clay-cement-like grouts, which could provide an eco-friendly and cheap solution to harmlessly treat the huge volume of waste drilling mud. The properties of waste drilling mud and behaviors of grouts prepared using the waste mud should be experimentally investigated before reutilization, owing to uncertainties of geology in various cases. The construction time using the simultaneous operation method is just about 60% of that of the traditional excavation method, and the low value of measured residual water inflow shows the reliability of reusing the waste drilling mud as grouting materials. The proposed method could virtually improve the shaft sinking rate and save the construction cost. The principles developed for these technical challenges have been proved to be applicable in practices, which are believed to strongly support the applicability of this new method in other cases.

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Section: Stability Of Grouting Holesmentioning

confidence: 99%

Section: Resource Recycling Of Waste Drilling Mudmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simultaneous Operations of Pregrouting and Shaft Drilling in Shaft Construction

Feng

et al. 2020

Advances in Civil Engineering

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“…The stress state of the drill bit is simplified, and the following assumptions were made for the model: (1). The coal and rock mass is a homogeneous and isotropic continuous medium; (2). The drilling process follows the limit stress equilibrium condition;…”

Section: Theory Of Temperature Field Evolution Of the Drill Bitmentioning

confidence: 99%

“…In the past decades, numerous researchers carried out many laboratory and field tests, complemented by analytical and numerical analyses, to investigate the temperature response mechanism of the drill bit. Liu et al [2][3][4][5], Eunhye et al [6] and Sajjad et al [7] have studied the dynamic and energy response characteristics of drill bits and drill pipes when a roadway anchorage hole was drilled into the roof rock interface and soft interlayer by means of numerical simulations. In addition, the dynamic and energy response characteristics of the drill bit are taken as the identification indexes of roof strata for further inversion analysis.…”

Section: Introductionmentioning

confidence: 99%

Study on Thermal Energy Conversion Theory in Drilling Process of Coal and Rock Mass with Different Stresses

Qiu

Ning

et al. 2019

Energies

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In view of the problem that the evolutionary mechanism of bit temperature during the drilling process is still unclear and the influencing factors are complex, this paper analyzes the causes of heat generation and the factors of heat production when the drill bit interacts with the coal and rock mass. Considering the stress field distribution of coal and rock mass and the dynamic characteristics of drilling, a three-dimensional mechanical structure model of bit drilling is established in this paper, based on the energy conservation theory and introducing the friction heat micro-distribution mechanism. The corresponding relationship between coal stress and the bit temperature variation rate is obtained in this paper. Therefore, the temperature rise condition model and the coal stress identification model can be verified, combined with the existing experimental data. The result shows that the temperature of bit drilling is affected by factors such as bit geometry and drilling parameters, as well as the strength and stress state of the coal and rock. Without considering other factors, the rate of increase in bit temperature is proportional to the stress of the coal and rock mass. Based on the research results, the temperature rate of the drill bit can be used as an index to identify the stress areas of coal and rock mass. Research results provide a theoretical basis for the identification of high-stress risk areas in coal mines.

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Dynamic response and fracture evolution of marble specimens containing rectangular cavities subjected to dynamic loading

Tan

Ren

et al. 2021

Bull Eng Geol Environ

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Numerical simulation and analysis of drill rods vibration during roof bolt hole drilling in underground mines

Cited by 19 publications

References 1 publication

Simultaneous Operations of Pregrouting and Shaft Drilling in Shaft Construction

Simultaneous Operations of Pregrouting and Shaft Drilling in Shaft Construction

Study on Thermal Energy Conversion Theory in Drilling Process of Coal and Rock Mass with Different Stresses

Dynamic response and fracture evolution of marble specimens containing rectangular cavities subjected to dynamic loading

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