scholarly journals Development of design solution for mine workings support repair and recovery in case of local massif deformations

2021 ◽  
Vol 315 ◽  
pp. 01010
Author(s):  
Sergey Tsibaev ◽  
Alexey Renev ◽  
Stepan Kalinin
Keyword(s):  
Rock Massif ◽  
Design Solution ◽  
Field Observations ◽  
Coal Rock ◽  
Mine Workings ◽  
Design Solutions ◽  
Term Field

The article describes the causes of occurrence and forms of geomechanical processes manifestation in surrounding coal-rock massif of mine workings supported by anchor support. Based on long-term field observations, six forms of typical deformations of the surrounding massif have been established. Design solutions to strengthen the anchor support or complete reinforcement of damaged sections of mine workings during geomechanical processes of local felling have been developed. They include: installation scheme, substantiation of parameters and list of used reinforcement elements; technology of work, a list of equipment used.

scholarly journals Long-term Field Observations on Seasonality in Chlorophyll-a Concentrations in a Shallow Coastal Marine Ecosystem, the Wadden Sea

2009 ◽  
Vol 33 (2) ◽  
pp. 286-294 ◽  
Author(s):  
Catharina Johanna Maria Philippart ◽  
Jolanda Martine van Iperen ◽  
Gerhard Cornelis Cadée ◽  
Alain François Zuur
Keyword(s):  
Chlorophyll A ◽  
Wadden Sea ◽  
Marine Ecosystem ◽  
Field Observations ◽  
Coastal Marine Ecosystem ◽  
Coastal Marine ◽  
Term Field

scholarly journals BEACH MORPHOLOGIES AT NOTSUKEZAKI SAND SPIT, JAPAN

2011 ◽  
Vol 1 (32) ◽  
pp. 48 ◽  
Author(s):  
Kentaro Hayashi ◽  
Koji Hayashimoto ◽  
Kazuki Yagisawa ◽  
Nobuhisa Kobayashi
Keyword(s):  
Numerical Model ◽  
Morphological Changes ◽  
Morphological Characteristics ◽  
Field Observations ◽  
Aerial Photos ◽  
Wave Hindcast ◽  
Beach Processes ◽  
Sand Spit ◽  
Term Field

Notsukezaki Sand Spit is the longest sand spit in Japan and the wave and morphological characteristics vary along the spit. The main purpose of this study is to investigate the morphological changes of the sand spit for long-term and mid-term field observations and aerial photos. The natural and morphological characteristics are investigated based on the field observations and aerial photos for a long-term period (decades). The regional sediment budget is estimated using the shoreline changes and the result of wave hindcast simulation for five years. Finally, the cross-shore beach processes are examined using the numerical model, CSHORE.

scholarly journals Analyzing vegetation change in a sagebrush ecosystem using long‐term field observations and Landsat imagery in Wyoming

Ecosphere ◽  
2020 ◽  
Vol 11 (12) ◽  
Author(s):  
Hua Shi ◽  
Collin Homer ◽  
Matthew Rigge ◽  
Kory Postma ◽  
George Xian
Keyword(s):  
Vegetation Change ◽  
Landsat Imagery ◽  
Field Observations ◽  
Sagebrush Ecosystem ◽  
Term Field

scholarly journals Analysis of rock mass and anchor support elements deformations during the long-term maintenance of mine workings

2020 ◽  
Vol 174 ◽  
pp. 01001
Author(s):  
Sergey Tsibaev ◽  
Alexey Renev ◽  
Rinat Zainulin ◽  
Alexander Kucherenko
Keyword(s):  
Water Saturation ◽  
Visual Assessment ◽  
Rock Massif ◽  
Underground Mines ◽  
Survey Period ◽  
Rock Stability ◽  
Mine Workings ◽  
Roof Rocks ◽  
Term Maintenance

The results of instrumental and visual assessment of near-rock massif and anchor support elements state in the conditions of long-term maintenance of mine workings has been presented. Particular attention is paid to underground mines in a flooded state. The result of various profiles fixing bolts strength tests of in the roof and sides of the workings has been presented. It has been established that the probability distribution of the anchoring bolts force in the holes in roof of the workings obeys the normal distribution tendency. The result of a radar survey of roof rocks using the Georadar OKO-2 has been analyzed. It was revealed that the height of the stratification of rocks in the mine workings roof varies from 0.2 m to 2.25 m, a comparison is made with the theoretical height of the collapse arch. The propensity of the near rock massif to water saturation has been estimated, the height of the water saturation of the roof rocks has been established. It has been established that the height of moisture depends on the arch of rock stability formed during the survey period. It has been found that water saturation of the rocks leads to a decrease in the specific cohesion of the resin capsules bonding composition with the walls of the hole by 55-67% in roof and by 72% in walls of mine workings.

scholarly journals The influence of the rigidity of mining security structures on the stability of side rocks in the coal-rock massif

2021 ◽  
Vol 3 (1(59)) ◽  
pp. 19-22
Author(s):  
Anton Korol
Keyword(s):  
Flexural Rigidity ◽  
Compressive Load ◽  
Rock Massif ◽  
Crushed Rock ◽  
Original Material ◽  
Dimensionless Stress ◽  
Coal Rock ◽  
Mine Workings ◽  
The Stability ◽  
Stratified Rock

The object of research is the processes of controlling the state of side rocks to prevent the collapse of the stratified rock strata in the coal-rock massif containing the workings. The studies carried out made it possible to establish the influence of the rigidity of the guard structures of mine workings on the stability of side rocks in the coal-rock massif. It is proved that as a result of the action of an external compressive load on the supporting lateral rocks, the structure, in the form of a model of bunches made of wooden posts, increases its rigidity until the destruction of the security structure. After that, there is an increase in the convergence of side rocks and their destruction. The change in the stiffness of the crushed rock in the filling massif model, which is used to support the lateral rocks, occurs as a result of the compaction of the original material. This is due to repackaging of crushed rock fractions of different sizes and its additional grinding. As a result of this interaction of the side rocks with the filling massif, the integrity of the roof and soil is ensured and convergence is limited. To assess the stability of side rocks, it is proposed to use a dimensionless stress concentration factor k. This coefficient takes into account the rigidity of the guard structures of the mine workings and the flexural rigidity of the side rocks. It was found that when the values of the coefficient k are close to zero (k→0), there is a loss of stability of the guard structures of mine workings and the destruction of side rocks in the coal-rock massif. The preservation of the integrity of the side rocks and the stability of security structures is ensured at values of k>0.1, which corresponds to the parameters of the pliable supporting structures. Most favorably on the condition of side rocks in the coal-rock massif is influenced by the method of backing up the mined-out space of crushed rock. The use of this method excludes the collapse of side rocks. When solving the problem of stability of mine workings at the stage of making technical decisions, it is necessary to predetermine the issues of rigidity of security structures with deformation characteristics of side rocks.

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