Stability is the main problem in underground excavations that can result in rock-related accidents or closure of mines. This is often controlled by the geological condition of the rockmass and the in situ stress field where excavation is being carried out. Over the years, conventional support systems such as bolts, shotcrete and mesh have been the standard support systems used in difficult ground conditions to maintain stability of underground openings. The novel Thin Spray Liner (TSL) is a technology with an improvement in terms of support capabilities for difficult geological conditions. This technology is predicted to replace conventional support systems, as it offers a significant yielding capacity that is better than that of the traditional techniques of controlling strata. The performance of the TSL lies between that of shotcrete and wire mesh. The TSL has numerous advantages regarding rock reinforcement such as rapid curing period, fast application, high tensile strength, high adhesion properties that prevent movement of rock keyblocks, improved cycle times, reduction in material-handling compared to shotcrete, and a significant ability to penetrate joints. These advantages increase the allowance for mechanisation and improvement of safety in excavations. Despite various benefits of TSLs, there are shortcomings which make end-users to be sceptical about the technology. This study provides a detailed review of the mechanism, properties, composition and types, as well as the general and mining applications of TSLs. It also describes the challenges faced by the mining industry and other end-users in accepting the technology as a solution for stability issues in underground openings. In addition, some insightful suggestions are made as recommendations for future work on the development of suitable, effective and efficient thin surface rock support technology within limitations/constraints.
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Kolapo Peter Onifade Moshood Said Khadija Omar Amwaama Martha Aladejare Adeyemi Emman Lawal Abiodun Ismail Akinseye Praise Oluwatomisin 《Geotechnical and Geological Engineering》2021,39(8):5445-5477
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Orimoloye Israel R. Olusola Adeyemi O. Belle Johanes A. Pande Chaitanya B. Ololade Olusola O. 《Natural Hazards》2022,112(2):1085-1106
Natural Hazards - Droughts are particularly disastrous in South Africa and other arid regions that are water-scarce by nature due to low rainfall and water sources. According to some studies,... 相似文献
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We present an approach that creates the possibility of reservoir monitoring on a quasi‐continuous basis using surface seismic data. Current strategies and logistics for seismic data acquisition impose restrictions on the calendar‐time temporal resolution obtainable for a given surface‐seismic time‐lapse monitoring program. One factor that restricts the implementation of a quasi‐continuous monitoring program using conventional strategies is the time it takes to acquire a complete survey. Here quasi‐continuous monitoring describes the process of reservoir monitoring at short‐time intervals. Our approach circumvents the restriction by requiring only a subset of complete survey data each time an image of the reservoir is needed using surface seismic data. Ideally, the time interval between survey subset acquisitions should be short so that changes in the reservoir properties are small. The accumulated data acquired are used to estimate the unavailable data at the monitor survey time and the combined recorded and estimated data are used to produce an image of the subsurface for monitoring. We will illustrate the effectiveness of our approach using 2D and 3D synthetic seismic data and 3D field seismic data. We will explain the benefits and drawbacks of the proposed approach. 相似文献
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Geological transition zones are noted to be problematic in groundwater potential and development, due to their erratic and complex nature as well as characteristic of the subsurface lithologies. There were several occurrences of reported borehole failures and dry wells in these zones in Nigeria as a result of very scanty information that could serve as database for studying its groundwater potential. This study was therefore designed to generate hydrogeophysical data that could serve as baseline information on the groundwater potential in the study. In addition, to also delineate various subsurface lithologies present. Electrical resistivity survey for geophysical investigation was carried out using vertical electrical sounding (VES) technique. A total of 150 VES stations were purposively probed using Schlumberger electrode array. The interpreted data were used to produce geoelectric subsurface lithologies and to draw the geological section across the entire area. Various subsurface lithologies with their resistivities (Ωm) were delineated for basement complex (BC), transition zone (TZ), and sedimentary terrain (ST). In BC were topsoil, weathered zone, and fresh bedrock and in TZ were topsoil, sandy, laterite/clay, dry sand, sandstone, and fresh bedrock delineated while in the ST, topsoil, lateritic and sandy clay, dry sand, and the sandstone were delineated. In conclusion, the groundwater potential of the study area is largely been affected by the topography and the nature/composition of the Abeokuta Group that underlie the sedimentary part of the study area and the presence of thick laterite/clay unit of the basement complex portion of the study area. 相似文献
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Expressing the rate of energy dissipation either within a basin or in a downstream manner is important in understanding occurrence and association between various morphological variables. This study focuses on the downstream variation in stream power and its relationship with morphological variates along the main channel of River Ona, Ibadan, Nigeria. River Ona stretches for 20.5 km downstream of Eleyele Dam. Twenty‐seven (27) points were sampled along this stretch. The 27 points were averaged into nine (9) reaches. At each cross‐section, channel characteristics were observed and measured. These include: width (W), depth (D), velocity (V), slope (S), Cross‐sectional area (A), discharge (Q), total stream power (TSP), specific stream power (SSP), width‐depth ratio (W/D), hydraulic radius (R) and wetted perimeter (P). This study confirmed that the influence of a dam present upstream of a river channel significantly alters the behaviour of slope and this in essence affects the distribution of energy along the river channel. Slope produces a logarithmic relationship with increasing distance downstream (Y = ‐32.79‐0.70InS, r = 0.70, r2 = 0.49, p < 0.05) while there was no significant relationship between Q and distance downstream. 相似文献
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Adeyemi Emman Aladejare 《Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards》2017,11(1):22-41
ABSTRACTRocks are natural geo-materials, whose properties are affected by many spatially-varying factors, such as the properties of their parent materials, weathering processes, and discontinuity conditions. Engineering properties of rocks therefore vary spatially and exhibit significant variability. To evaluate rock property variability, an extensive literature review is performed in this study to collect data reported in literature for igneous, sedimentary and metamorphic rocks during the last several decades. The typical ranges of rock property data, mean values and coefficient of variations of rock properties are evaluated and summarized. These typical ranges of rock properties can be used as guidelines for approximation when rock property data are not available at a project site. Furthermore, they can be used as prior knowledge when developing Bayesian framework for quantifying the variability of rock properties at a specific project site. 相似文献
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Peter Kolapo Moshood Onifade Akinseye Praise Oluwatomisin Martha Amwaama Khadija Said Omar Abdulsalam Jibril Ismail Lawal Abiodun Emman Aladejare Adeyemi 《Geotechnical and Geological Engineering》2022,40(4):1637-1661
Geotechnical and Geological Engineering - Historically, the idea of designing and installing rockbolts in rockmasses can be traced back to the construction of the Snowy Mountain hydroelectric... 相似文献
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Aladejare Adeyemi Emman Alofe Emmanuel Damola Onifade Moshood Lawal Abiodun Ismail Ozoji Toochukwu Malachi Zhang Zong-Xian 《Geotechnical and Geological Engineering》2021,39(6):4427-4455
Geotechnical and Geological Engineering - Empirical relationships for estimating Uniaxial Compressive Strength (UCS) of rock from other rock properties are numerous in literature. This is because... 相似文献
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