Tunnel Collapse Treatment Technique Research in Xinjiang Tianshan High-Altitude, Low-Temperature Mountain

2014 ◽  
Vol 580-583 ◽  
pp. 1161-1167 ◽  
Author(s):  
Chun Sheng Zhu ◽  
Xiao Hua Yang
Keyword(s):  
Low Temperature ◽  
High Altitude ◽  
Deformation Rate ◽  
Tianshan Mountains ◽  
Stress And Strain ◽  
Outlet Section ◽  
Treatment Technique ◽  
Technical Effect ◽  
Geological Conditions ◽  
Tunnel Collapse

Based on YuXiMoLeGai tunnel in G217 Cholma to the Nalati highway, aiming at the outlet section of K723+911~K723+919 collapse, through model experiment and numerical calculation combined with on-site measurement, the article studies tunnel collapse treatment technique and technical effect in xinjiang tianshan mountains in the geological conditions of high altitude, low temperature, crushing of rock mass and rock rich in water. The results show that after the CRD method, expanding the scope of the grouting construction, increasing the number of small duct grouting lock foot, strengthening methods of supporting parameters are adopted, vault subsidence deformation rate is 0.4-1.5 mm/d, peripheral convergence deformation rate is 0.5-2.2 mm/d, stress the most unfavorable right hance monthly increase in stress and strain amplitude is 3.97% and 2.35% respectively.The treatment controls the land slide body deformation and stress well.

scholarly journals Study on the Geological Condition Analysis and Grade Division of High Altitude and Cold Stope Slope

2021 ◽  
Vol 13 (22) ◽  
pp. 12464
Author(s):  
Ruichong Zhang ◽  
Shiwei Wu ◽  
Chenyu Xie ◽  
Qingfa Chen
Keyword(s):  
Low Temperature ◽  
High Altitude ◽  
Stable State ◽  
Geological Condition ◽  
Rock Layer ◽  
Eastern Slope ◽  
Geological Conditions ◽  
Grade Ii ◽  
Grade Division ◽  
Grade Iii

Analysis of the geological conditions of high-altitude and low-temperature stope slopes and the study of grade division are the basis for the evaluation of slope stability. Based on the engineering background of the eastern slope of the Preparatory iron mine in Hejing County, Xinjiang, we comprehensively analyse and summarize the factors that affect the geological conditions of high-altitude and cold slopes and finally determine nine geological conditions that affect the index parameters. Based on a back-propagation (BP) neural network algorithm, we establish an applicable network model to analyse the geological conditions of slopes in cold areas. The model is applied to the eastern slope to analyse and classify the geological conditions of the high-altitude and low-temperature slopes. The research results show that the skarn rock layer in the eastern slope is in a stable state and not prone to landslides, and its corresponding geological condition is Grade I; meanwhile, the monzonite porphyry rock layer is in a relatively stable state, with a potential for landslides and a corresponding geological condition Grade II. The marble rock layer is in a generally stable state, there is the possibility of landslide accidents, and the corresponding geological condition level is Grade III. The limestone rock layer is in an unstable state and prone to landslide accidents, it has a corresponding geology condition Grade IV. Therefore, the eastern slope can be divided into different geological condition regions: Zone I, Zone II, Zone III, and Zone IV, and the corresponding geological condition levels for these are Grade I, Grade II, Grade III, and Grade IV. These results may provide a basis for the stability evaluation of high altitudes and cold slopes.

scholarly journals Diversity and Distribution of Bracket Fungi in Mt. Kilakiron, Bukidnon, Philippines

2021 ◽  
Vol 13 (1) ◽  
pp. 41-50
Author(s):  
Mc Arthur Lequin Cababan ◽  
Aprille Kake Ora Jaranilla ◽  
Mariane Catayas Bastatas ◽  
Chazzel Feel Comonong Salvane ◽  
Uzziel Campuso Toldo
Keyword(s):  
Low Temperature ◽  
Nutrient Cycling ◽  
High Altitude ◽  
Environmental Factor ◽  
Trametes Versicolor ◽  
Diversity Index ◽  
Large Contribution ◽  
Floristic Survey ◽  
Symbiotic Relationships ◽  
Total Species

Fungi have a lot of important function in the bionetwork resembling to decomposition and even nutrient cycling with respect to its symbiotic relationships with trees and other plants. This study aimed to assess the diversity and distribution of bracket fungi in Mt. Kilakiron, Portulin, Pangantucan, Bukidnon. Thus, floristic survey was conducted in one of the mountain of Mindanao to provide information as to what and how many species of bracket fungi are present in Mt. Kilakioron, Bukidnon, Philippines.  40 total species belonging to 17 genera and 5 family was collected and assessed. 12 individuals of Trametes versicolor were observe which favors dwellings with low temperature and high altitude are. Additionally, study revealed that most types of bracket fungi initiate in the site are decomposers and saprophytic in nature which contributes a lot in the process of putrefaction. The species of bracket fungi in Mt. Kilakiron clearly shows abundant and provides a large contribution to the ecosystem having high Shannon diversity index. The significance of each environmental factor is discussed in relationship to the ecology of the species. Bracket fungi are reliant on the climatic and conservational settings which makes them as excellent natural pointers of ecosystem in the forests of Mindanao Island, Philippines.

Unimpeded migration of ions in carbon electrodes with bimodal pores at an ultralow temperature of −100 °C

2019 ◽  
Vol 7 (27) ◽  
pp. 16339-16346 ◽  
Author(s):  
Xi Wang ◽  
Jiang Xu ◽  
Joselito M. Razal ◽  
Ningyi Yuan ◽  
Xiaoshuang Zhou ◽  
...  
Keyword(s):  
Energy Storage ◽  
Low Temperature ◽  
High Altitude ◽  
Space Missions ◽  
Carbon Electrodes ◽  
Discharge Energy ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Ultralow Temperature ◽  
Temperature Applications

The ability to rapidly charge (and discharge) energy storage devices at extremely low temperature (down to −100 °C) is critical for low-temperature applications such as high altitude exploration and space missions.

Low-temperature crystallization and paraelectric–ferroelectric phase transformation in nanoscale ZrO2 thin films induced by atomic layer plasma treatment

2020 ◽  
Vol 8 (11) ◽  
pp. 3669-3677
Author(s):  
Sheng-Han Yi ◽  
Kuei-Wen Huang ◽  
Hsin-Chih Lin ◽  
Miin-Jang Chen
Keyword(s):  
Thin Films ◽  
Phase Transformation ◽  
Low Temperature ◽  
Plasma Treatment ◽  
Ferroelectric Phase ◽  
Atomic Layer ◽  
Treatment Technique ◽  
Low Temperature Crystallization ◽  
Temperature Crystallization

Crystallization and ferroelectricity with high endurance are achieved in ZrO2 thin films at low temperature using an atomic layer plasma treatment technique.

scholarly journals The method for determining working resistance of advance support bracket in deep fully mechanized roadway based on Flac3D

2018 ◽  
Vol 10 (6) ◽  
pp. 168781401878362 ◽  
Author(s):  
Guanghui Xue ◽  
Jijie Cheng ◽  
Jian Guan ◽  
Jingxuan Chai ◽  
Guofeng Zhang ◽  
...  
Keyword(s):  
Coupling Model ◽  
Surrounding Rock ◽  
Numerical Calculations ◽  
Stress And Strain ◽  
Determination Method ◽  
Mechanical Coupling ◽  
Mining Depth ◽  
Geological Conditions ◽  
Working Principle ◽  
Working Resistance

Fully mechanized roadway is an area of high accident incidence, and the problem is more prominent with the increase of mining depth of coal resources. The advance support scheme put forward for fully mechanized mining roadway with self-moving support and anchor combined unit, and the configuration and working principle of support robot was explicated. A determination method on the working resistance of advance support bracket was proposed based on mechanical coupling model of surrounding rock-advance support brackets. Taking the geological conditions of the Qishan mine as an example, the process of analyzing and determining the working resistance of the advance support bracket was described using this method. An advance support bracket was designed using SolidWorks, and the working load was obtained based on numerical calculations. Then the stress and strain were analyzed using ANSYS. The results showed that the designed advance support bracket can withstand the corresponding top plate pressure. It provides a new method and thought for study and development of advance supporting equipment in deep fully mechanized roadway.

Effect of Heat Treatment Technique on the Low Temperature Impact Toughness of Steel EQ70 for Offshore Structure

2017 ◽  
Vol 36 (8) ◽  
pp. 825-830 ◽  
Author(s):  
Su-Fen Tao ◽  
Yun-Jin Xia ◽  
Fu-Ming Wang ◽  
Jie Li ◽  
Ding-Dong Fan
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Impact Toughness ◽  
Treatment Technique ◽  
Offshore Structure ◽  
Treatment Techniques ◽  
Temperature Impact ◽  
Low Temperature Impact Toughness ◽  
The Impact ◽  
Quenching And Tempering

AbstractCircle quenching and tempering (CQ&T), intercritical quenching and tempering (IQ&T) and regular quenching and tempering (Q&T) were used to study the influence of heat treatment techniques on the low temperature impact toughness of steel EQ70 for offshore structure. The steels with 2.10 wt. % Ni (steel A) and 1.47 wt. % Ni (steel B) were chosen to analyze the effect of Ni content on the low temperature impact toughness of steel EQ70 for offshore structure. The fracture morphologies were examined by using a scanning electron microscope (SEM, JSM-6480LV), and microstructures etched by 4 vol. % nitric acid were observed on a type 9XB-PC optical microscope. The results show that the impact toughness of steel A is higher than that of steel B at the same test temperature and heat treatment technique. For steel B, the energy absorbed is, in descending order, CQ&T, Q&T and IQ&T, while for steel A, that is CQ&T, IQ&T and Q&T. The effects of heat treatment on the low temperature impact toughness are different for steels A and B, the absorbed energy changes more obviously for steel A. The results can be significant references for actual heat treatment techniques in steel plant.

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