Experimental Investigating of Latex Cement as Similar Material Simulating Soft Rock Creep

2012 ◽  
Vol 535-537 ◽  
pp. 1940-1943
Author(s):  
Yong Yan Wang ◽  
Feng Li ◽  
Xiu Jiang Tai
Keyword(s):  
Soft Rock ◽  
Fine Sand ◽  
Polymer Materials ◽  
Similar Material ◽  
Ansys Simulation ◽  
Rock Creep ◽  
Similar Simulation Experiment ◽  
Styrene Butadiene ◽  
Rock Rheology ◽  
Similar Simulation

This paper takes styrene-butadiene latex with 37% solid contents, the portland cement of number 45r and fine sands with 0.2mm diameter to prepared similar material, the mass ratio of cement and fine sand is fixed, different ratio of the specimens are prepared by adjusting the latex ratio. The MATLAB fitting and ANSYS simulation calculation are used to compare to the date of soft rock. The analysis shows that the latex cement can be used for deep soft rock rheology theory and polymer materials similar simulation experiment.

Structural effect of soft rock rheology

2007 ◽  
Vol 14 (S1) ◽  
pp. 430-435 ◽  
Author(s):  
Yuan-jiang Chen ◽  
Yi-ming Fu ◽  
Ping Cao
Keyword(s):  
Soft Rock ◽  
Structural Effect ◽  
Rock Rheology

The Mechanical Mechanism of Hulking Force Stable Principle of Surrounding Rocks in Soft Rock Roadway

2014 ◽  
Vol 1065-1069 ◽  
pp. 830-834
Author(s):  
Wei Pei Xue ◽  
Lai Wang Jing
Keyword(s):  
Stress State ◽  
Ultimate Strength ◽  
Soft Rock ◽  
Reference Value ◽  
Industrial Test ◽  
Surrounding Rock ◽  
Support Mechanism ◽  
Rock Creep ◽  
Main Factors

This paper aims to reveal the important role of the hulking force in stabilizing the roadway. After introducing the three ultimate strength of the foundation rock upon, starting from the perspective of stress state, the article on the deformation area surrounding rock for a more reasonable division, and thus gives the main factors roadway deformation.Introduced in the basis of the three ultimate strength of the rock, from the perspective of stress state, deformation of roadway surrounding rock area to carry on the reasonable division, and then the main factors of roadway deformation is presented. Second, through the analysis of the formation of the hulking force, analysis of hulking force inhibition of surrounding rock creep mechanism of dynamic mechanics,and analysis of the hulking force to improve the effect of supporting mechanics mechanism. Describes the important role of the hulking force on the stability of surrounding rock. Finally, Huaibei Coal Mining Co., 8203 guobei roadway industrial test site, Demonstrates the effectiveness of the principle. Results of this study have important reference value to change the current research in deep coal mine deep soft rock and loose seam roadway support mechanism and technology.

scholarly journals Study and Application of Similar Material Ratio in Collapsible Loess

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Bingchao Zhao ◽  
Yunxiang Ma ◽  
Yaxin Guo ◽  
Hao Sun ◽  
Jingbin Wang ◽  
...  
Keyword(s):  
Internal Friction ◽  
Moisture Content ◽  
Friction Angle ◽  
Internal Friction Angle ◽  
Similar Material ◽  
Range Analysis ◽  
River Sand ◽  
Collapsible Loess ◽  
Seam Mining ◽  
Similar Simulation

The similar material of collapsible loess is the basis and premise of the experimental study on the surface movement and deformation law of coal seam mining in collapsible loess-covered areas. The orthogonal experiment is used to make up similar material with different proportions using river sand and barite powder as aggregate, clay and gypsum as cementing material, and diatomite as adjusting material. The reasonable proportion of similar material in collapsible loess is studied by using range analysis, similar simulation, and field measurement. The results show that the content of diatomite plays a leading role in the collapsibility coefficient of similar material, and the collapsibility coefficient is positively correlated with the content of diatomite; moisture content is the main control of the cohesion of the material, and cohesion is negatively correlated with the moisture content; the ratio of bone-to-glue has the most significant effect on the internal friction angle, and the internal friction angle is positively correlated with the ratio of bone-to-glue. The reasonable ratio of the similar material in collapsible loess is 8 : 2 of the ratio of bone-to-glue, the ratio of clay-to-gypsum is 9 : 1, the barite powder content is 6%, the diatomite content is 23%, and the moisture content is 13%, and the mechanical parameters of the collapsible loess are 5.3%–6.3% different from the target value of similar material through laboratory tests, which can meet the experimental requirements. It is verified by a similar simulation experiment that the maximum surface subsidence value and the surface fracture width in the simulation results are 6.9% and 7.8% different from the field measured results, indicating a high degree of agreement. The results of the study have important references and guiding significance for the preparation of similar material with similar models.

scholarly journals Analysis of Surrounding Rock Creep Effect on the Long-Term Stability of Tunnel Secondary Lining

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Xiaoqian Zhang ◽  
Chengmin Wei ◽  
Heng Zhang
Keyword(s):  
Stress Measurement ◽  
Soft Rock ◽  
In Situ Stress ◽  
Calculation Model ◽  
Surrounding Rock ◽  
In Situ Stress Measurement ◽  
Rock Creep ◽  
Secondary Lining ◽  
Rock Tunnel

The secondary lining failure of deep buried soft rock tunnel often occurs, which is obviously related to the time factor. The formation mechanism of this phenomenon is studied in this paper. Therefore, the combination of in situ stress measurement and neural network inversion is used to analyze the distribution characteristics of in situ stress. At the same time, the creep characteristics of surrounding rock are tested in laboratory, and the key parameters are obtained. Combined with the characteristics of surrounding rock, the calculation model is established by using discrete element simulation technology and considering the joints of surrounding rock. According to the above multiple information, the stress characteristics of the secondary lining in different time periods are analyzed creatively. Finally, the method of setting arch and adding anchor bolt in key parts is proposed, and significant effect results are obtained.

Experimental Study on Self-Made Similar Material of Soft Rock

2016 ◽  
Vol 717 ◽  
pp. 140-146 ◽  
Author(s):  
Jian Guang Li ◽  
Yang Wu ◽  
Yong Yan Wang ◽  
Nan Qin ◽  
Wei Xing Wang
Keyword(s):  
Model Experiment ◽  
Mechanical Characteristics ◽  
Soft Rock ◽  
Material Model ◽  
Similar Material ◽  
Advantages And Disadvantages ◽  
Mixed Mortar ◽  
Cementing Agent ◽  
Physical And Mechanical Characteristics ◽  
The Ideal

Similar material of soft rock used at domestic and abroad are analyzed and compared and researched the advantages and disadvantages of them. Self-made similar material of soft rock mixed with cement, plaster mixed mortar as a cementing agent and sand, rubber powder as aggregate were analyzed and compared. After analyzed multi physical and mechanical characteristics, different ratios of specimens were verified by adjusting the ratio of different materials in similar material to obtain the ideal similar material of soft rock. It was provided reference for similar material model experiment of soft rock.

Numerical Analysis for Thermal-Chemical-Stress Coupling in Deep Rock Creep Properties

2013 ◽  
Vol 561 ◽  
pp. 657-662
Author(s):  
Yan Chun Wang ◽  
Yuan Li ◽  
Jian Guang Li
Keyword(s):  
Ph Value ◽  
Coupling Effect ◽  
High Stress ◽  
Soft Rock ◽  
Effect Of Temperature ◽  
Creep Equation ◽  
Creep Properties ◽  
Rock Creep ◽  
Deep Rock ◽  
Rock Tunnel

The control equations for analyzing coupled thermal chemical-mechanical phenomena of deep rocks are established. Using creep equation by experimental data, 3D numerical simulation for creep properties of deep soft tunnel under coupling effect of temperature field, chemical field and stress field are conducted by ANSYS, and different effects of these fields on deep soft rock tunnel creep properties are analyzed, whats more time-creep curves of different temperature, pH value and stress deviation of the mid-point of the top of tunnel are obtained. Effect of these three fields on creep characteristics of deep soft rock cant be ignored. Under deep complex environment, high-stress is main factor of tunnel creep; creep increasing with temperature increasing. From simulation results, we get whether acidic environment or alkaline environment causes significantly stronger corrosive effect on the rock mass than the neutral environment, and increases its creep.

Development of a Rheology Analogical Material for Time-Based Rock Masses

2013 ◽  
Vol 838-841 ◽  
pp. 967-971
Author(s):  
Xu Guang Chen ◽  
Yu Mei ◽  
Xin Zhang ◽  
Qiang Chen
Keyword(s):  
Laboratory Test ◽  
Mechanical Behavior ◽  
Complex Modulus ◽  
Rock Type ◽  
Soft Rock ◽  
Test Machine ◽  
Component Ratio ◽  
Similar Material ◽  
Indirect Tensile ◽  
Chlorinated Paraffin

The paper presents the development of a similar material to simulate the soft rock type in engineering, especially the time-depending behavior. The iron, barite and cement are selected to be the aggregate and the solution of rosin is selected as the glue. To improve the plasticity and rheology behavior, chlorinated paraffin was added, too. Laboratory test was carried by construct the specimens using a mould. The uniaxial complex modulus test and indirect tensile strength test were performed to obtain the basic mechanical behavior. And the rheology test was carried by a self-developed rheology test machine to research on the time-depending behavior. By laboratory test, the influence of the each component on the mechanical behavior was determined. Results show that the effects of component ratio and solution thickness on the material mechanical behavior. The rheology behavior was especially well simulated by the similar material developed.

Suppression of the Activity of Metal Ions in the Oxidation of Rubber

1963 ◽  
Vol 36 (2) ◽  
pp. 541-546 ◽  
Author(s):  
A. S. Kuzminskii ◽  
V. D. Zaitsev ◽  
N. N. Lezhnev
Keyword(s):  
Metal Ions ◽  
Oxidation Process ◽  
Complex Compounds ◽  
Polymer Materials ◽  
Copper Compound ◽  
Copper Compounds ◽  
Vulcanized Rubber ◽  
Diethyldithiocarbamic Acid ◽  
Styrene Butadiene ◽  
Variable Valency

Abstract It is shown that the catalytic activity of variable valency metal ions, Cu++ and Fe+++, with respect to the oxidation of polymeric unsaturated hydrocarbons (natural and styrene-butadiene rubbers) can be completely suppressed by introducing into the polymer, materials which form strong inner complex compounds with these ions. It was established that the synthesized compounds of copper and iron with tetramethylthiuramdisulfide, diethyldithiocarbamic acid, and p-hydroxyphenyl-2-naphthylamine not only do not accelerate the oxidation of polymers, but act as inhibitors of the oxidation process. By chemical and luminescence methods the compositions of the indicated compounds were established to correspond to the following formulas: (D—deactivator) DFe and DCu (iron and copper compounds with tetramethylthiuramdisulfide); D2Fe and D2Cu (iron and copper compounds of diethyldithiocarbamic acid); DFe2 (iron compound of p-hydroxyphenyl-2-naphthylamine); DCu3 (copper compound of p-hydroxyphenyl-2-naphthylamine). These data indicate a new route for the synthesis of effective inhibitors for raw and vulcanized rubber.

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