Sodium Carbonate Preflush Theoretical Analysis and Application to Chateaurenard Field Test

1985 ◽  
Author(s):  
R. Rivenq ◽  
M. Sardin ◽  
D. Schweich ◽  
A. Putz
Keyword(s):  
Theoretical Analysis ◽  
Field Test ◽  
Sodium Carbonate

scholarly journals Aplikasi Geofoam Sebagai Material Timbunan di Atas Tanah Lunak

2011 ◽  
Vol 2 (1) ◽  
pp. 106
Author(s):  
Irpan Hidayat ◽  
Andryan Suhendra
Keyword(s):  
Theoretical Analysis ◽  
Eastern Europe ◽  
Field Test ◽  
Expanded Polystyrene ◽  
Soft Ground ◽  
Laterite Soil ◽  
Fill Material ◽  
Low Weight ◽  
Weight Property ◽  
Preliminary Research

Geofoam is a geosintetik material made of Expanded Polystyrene (EPS) and Xtruded Polystyrene (XPS), which has a low weight property which makes geofoam widely used as a lightweight fill material and has been applied in Europe, especially in Eastern Europe. This is a preliminary research that emphasizes on the use of geofoam as a fill material on soft ground through theoretical analysis using Plaxis program. Supporting data used covers data of basic and fill ground taken from specific locations which are planned for subsequent research as a field test. Based on the Plaxis program results, the use of geofoam as a fill material give a higher safety factor value with a smaller deformation compared to laterite soil. This result indicates that the use of geofoam as a fill material can be considered to be applied in the country. 

scholarly journals Evolution Mechanism of Interconnected Vertical Fractures in the Overburden of Longwall Coal Mining

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
He Changchun ◽  
Lu Weiyong ◽  
Zha Wenhua
Keyword(s):  
Compressive Strength ◽  
Theoretical Analysis ◽  
Field Test ◽  
Systematic Study ◽  
Water Inrush ◽  
Tensile Failure ◽  
Field Verification ◽  
Longwall Coal Mining ◽  
Similar Simulation ◽  
Vertical Fractures

Whether a tensile failure fracture will penetrate a stratum is difficult to ascertain at present. In view of this, the method of similar simulation and field verification are used to carry out a systematic study. Similar simulations show that tensile failure fractures will penetrate the layered strata if the compressive stress is greater than the compressive strength. Theoretical analysis points out that whether the tensile failure fractures will penetrate the layered strata can be expressed by the value of criterion of interconnected vertical fractures and the compression-tension ratio. When the value of criterion of interconnected vertical fractures is greater than the compression-tension ratio, the layered strata will break. This criterion was qualitatively verified with a field test. The results of this paper are of great significance for the prevention of water inrush in coal mines, and it can also promote the understanding of the law of strata movement.

scholarly journals Analysis of Centroid Trajectory Characteristics of Axial-Flow Pump Impeller Under Hydraulic Excitation

2021 ◽  
Vol 9 ◽  
Author(s):  
Xiaohui Duan ◽  
Fangpin Tang ◽  
Hao Xu ◽  
Jian Chen ◽  
Qun Lu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Field Test ◽  
Water Pressure ◽  
Axial Flow ◽  
Pump Unit ◽  
Pump Impeller ◽  
Time Frequency ◽  
Axial Flow Pump ◽  
Flow Pump

The hydraulic excitation characteristics of axial flow pump unit are studied through theoretical analysis, numerical simulation and field test in this paper. The correlation between impeller hydraulic and radial vibration displacement of impeller centroid is obtained through theoretical analysis. Through the 1-way fluid-solid-interaction (FSI) numerical simulation, the distributions of water pressure and displacement on the impeller surface are obtained, and the time-domain and frequency-domain characteristics of transient hydraulic and radial displacement are revealed. Through the field test, the external characteristics of axial flow pump unit and the time-frequency characteristics of the pressure pulsation at the measuring points beside the inlet of the impeller are obtained. The comparisons between simulation results and experimental results show that the former is accurate and reliable.

Design and Theoretical Analysis of Acoustic Enclosure for G12V190 Type Diesel Engine

2011 ◽  
Vol 338 ◽  
pp. 392-395
Author(s):  
Jin Sheng Ma ◽  
Na Na Dai ◽  
Yang Bo ◽  
Ling Zhou ◽  
Zi Feng Liu ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Theoretical Analysis ◽  
Theoretical Calculation ◽  
Noise Reduction ◽  
Field Test ◽  
Test Results ◽  
Reduction Effect

The existing acoustic cover is improved to reduce the noise of G12V190 type diesel engine. A panel of shutters structure is designed and simulated with SYSNOISE. The structure of acoustic enclosure is also been designed according to the structure of the diesel engine. Theoretical calculation shows that the improved insulation cover has not only a good noise reduction effect, but also has been greatly improved in terms of cooling ventilation, the field test results also shows that this section of acoustic enclosure can reduce the noise about 10dB.

Structural Design of Banana-Stem Shattering and Returning Machine

2012 ◽  
Vol 215-216 ◽  
pp. 119-124
Author(s):  
Yan Huang ◽  
Qing Gui Mo ◽  
Cheng Kun Wei ◽  
Ru Zhong Li
Keyword(s):  
Theoretical Analysis ◽  
Fuel Consumption ◽  
Field Test ◽  
Structural Design ◽  
Banana Stem

A new banana-stem shattering and returning machine which was designed by using a roller to prevent fiber from tangling solved the problem of preventing the roller from being tangled by fiber in a better way. Field test showed that fuel consumption per unit time was reduced by about 4%, shattering rate improved by about 5%, and the banana-stem shattering quality and agronomic requirements were met. Through theoretical analysis and field test, the structures and main parameters of such key components as swinging cutters and cutter rollers were determined.

Optimization of the tractive performance of four-wheel-drive tractors: Theoretical analysis and experimental substantiation

1998 ◽  
Vol 212 (4) ◽  
pp. 285-297 ◽  
Author(s):  
J. Y. Wong ◽  
N. B. McLaughlin ◽  
Z Knezevic ◽  
S Burtt
Keyword(s):  
Theoretical Analysis ◽  
Field Test ◽  
Angular Speed ◽  
Speed Ratio ◽  
Torque Distribution ◽  
Wheel Drive ◽  
Four Wheel Drive ◽  
Tractive Efficiency ◽  
Driving Torque ◽  
Experimental Substantiation

The results of a theoretical analysis reveal that, for a four-wheel-drive tractor to achieve the optimum tractive performance under a given operating condition, the thrust (or driving torque) distribution between the front and rear axles should be such that the slips of the front and rear tyres are equal. For four-wheel-drive tractors with rigidly coupled front and rear drive axles, this can be achieved if the theoretical speed (the product of the angular speed and the free-rolling radius of the tyre) of the front and that of the rear wheels are equal or the theoretical speed ratio is equal to 1. Field test data confirm the theoretical findings that, when the theoretical speed ratio is equal to 1, the efficiency of slip and tractive efficiency reach their respective peaks, the fuel consumption per unit drawbar power reaches a minimum, and the overall tractive performance is at an optimum.

Analysis on Security Appraisa of the Existing Reinforced Concrete Bridges

2014 ◽  
Vol 501-504 ◽  
pp. 1314-1317
Author(s):  
Shan Shan Xu
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Theoretical Analysis ◽  
Research Methods ◽  
Field Test ◽  
Concrete Bridges ◽  
Dynamic Loads ◽  
Reinforced Concrete Bridges ◽  
Static And Dynamic Loads

Safety inspection of the bridge has become particularly important owing to a large number of aging bridges in China, in order to evaluate the safety of a bridge project that has been completed in Harbin, research methods of combining theoretical analysis, numerical simulation and field test is applied, response parameters changes under static and dynamic loads is studied emphatically in this paper.

scholarly journals A Control Approach of the Roof in No-Pillar Roadway Formed by Roof Cutting and Pressure Releasing

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Qingnan Lou ◽  
Tingchun Li ◽  
Qingwen Zhu ◽  
Shanyuan Wu ◽  
Ming Yun ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Field Test ◽  
Theoretical Basis ◽  
Abutment Pressure ◽  
Mine Pressure ◽  
Control Approach ◽  
Test Study ◽  
Variation Range ◽  
Roadway Deformation ◽  
Support Cost

Roof control is one of the eternal themes of mine pressure theory, and it is also a key step of roadway formed by roof cutting. Based on the analysis of abutment pressure distribution, the viewpoint of controlling roadway roof by roof cutting distance is put forward according to the failure limit of roadway roof, and the calculation method of roof cutting distance is given. Based on the Qiuji coal mine’s background, the numerical and field test study is conducted to verify the theoretical analysis, and the allowable variation range of roof cutting distance is obtained. The research shows that the roof cutting distance, abutment pressure, and roadway deformation are closely related. By controlling the roof cutting distance, the roadway roof can be placed in the low-stress area, the roadway deformation can be reduced, and the support cost can be saved. This study provides a theoretical basis for explaining the roadway’s abnormal mine pressure and controlling the roadway roof by roof cutting.

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