Research on Support Technology in Deep Roadway of Huafeng Mine

2013 ◽  
Vol 753-755 ◽  
pp. 831-834
Author(s):  
Jie Kong ◽  
Peng Chen ◽  
Jun Chen ◽  
Qing Shu Liu ◽  
Zhen Ma
Keyword(s):  
Service Life ◽  
Mechanical Characteristics ◽  
Soft Rock ◽  
Surrounding Rock ◽  
Strata Control ◽  
Reference Function ◽  
The Stability ◽  
Inclined Angle ◽  
Roadway Deformation ◽  
Physical And Mechanical Characteristics

Huafeng mine 1141 roadway (the 5th) that the buried depth is nearly 1000m, the angel of roadway is larger, the physical and mechanical characteristics of surrounding rock are poor, belongs to typical large inclined angle soft rock deep roadway. Using the reasonable supporting way is very important to control the deformation of the surrounding rock in roadways. The strata control observation shows that the roadway deformation is in a predictable range, could effectively ensure the stability and service life of 1141 roadway (the 5th) by using combined support of anchor, bolting with band and net, composite U shape shed. It can provide reference function to the supporting way of similar deep roadway.

Numerical Simulation of Bolt-Mesh-Anchor Support Technology at Soft Rock Roadway

2013 ◽  
Vol 868 ◽  
pp. 251-254 ◽  
Author(s):  
Hui Yu ◽  
Ling Gen Kong ◽  
Zhi Yong Niu ◽  
Shi Ting Zhu ◽  
Dan Yang Jing
Keyword(s):  
Simulation Analysis ◽  
Soft Rock ◽  
Confining Pressure ◽  
Surrounding Rock ◽  
Numerical Software ◽  
The Stability ◽  
Roadway Deformation ◽  
Soft Rock Roadway ◽  
Surrounding Rock Stress ◽  
Rock Roadway

The roof of 12501 transportation roadway of Tunlan mine is friable. To solve the problem of large roadway deformation, the bolt-mesh-anchor support scheme is put forward. With the FLAC3D numerical software in the program, the simulation analysis shows that the program can effectively increase the roadway confining pressure to improve the state of the surrounding rock stress, reduce roadway displacement and deformation and thus keep the stability of the surrounding rock. The results show that Bolt and cable support can effectively control the surrounding rock, with the roadway convergence rate small, and the support system safe.

Judgement Method for Surrounding Rock Stability of Guanjiao Tunnel Based on Catastrophe Theory

2011 ◽  
Vol 90-93 ◽  
pp. 2307-2312 ◽  
Author(s):  
Wen Jiang Li ◽  
Su Min Zhang ◽  
Xian Min Han
Keyword(s):  
Plastic Strain ◽  
Catastrophe Theory ◽  
Soft Rock ◽  
Surrounding Rock ◽  
In Situ Monitoring ◽  
Engineering Practice ◽  
Stability Of Surrounding Rock ◽  
The Stability ◽  
Rock Tunnel

The stability judgement of surrounding rock is one of the key jobs in tunnel engineering. Taking the Erlongdong fault bundle section of Guanjiao Tunnel as the background, the stability of surrounding rock during construction of soft rock tunnel was discussed preliminarily. Based on plastic strain catastrophe theory, and combining numerical results and in-situ data, the limit displacements for stability of surrounding rock were analyzed and obtained corresponding to the in-situ monitoring technology. It shows that the limit displacements obtained corresponds to engineering practice primarily. The plastic strain catastrophe theory under unloading condition provides new thought for ground stability of deep soft rock tunnel and can be good guidance and valuable reference to construction decision making and deformation managing of similar tunnels.

scholarly journals FORMULATION, CHARACTERIZATION AND STABILITY STUDY OF FAST DISSOLVING THIN FILM CONTAINING ASTAXANTHIN NANOEMULSION USING HYDROXYPROPYLMETHYL CELLULOSE POLYMER

2021 ◽  
pp. 17-22
Author(s):  
LUSI NURDIANTI ◽  
IYAN SOPYAN ◽  
TAOFIK RUSDIANA
Keyword(s):  
Thin Film ◽  
Mechanical Characteristics ◽  
Storage Conditions ◽  
Stability Study ◽  
Matrix System ◽  
Stability Studies ◽  
Casting Method ◽  
Hydroxypropylmethyl Cellulose ◽  
The Stability ◽  
Physical And Mechanical Characteristics

Objective: The present study was conducted to formulate and characterize the thin film containing astaxanthin nanoemulsion (TF-ASN) using Hydroxypropylmethyl Cellulose (HPMC) polymer as a film matrix system. The stability studies in different storage conditions were also performed. Methods: Astaxanthin nanoemulsion (As-NE) was prepared by using self-nanoemulsifying method, followed by incorporation into the HPMC matrix system by solvent casting method to forming TF-ASN. Evaluation of TF-ASN was performed by physical and mechanical characterizations. Stability study was carried out in both of accelerated (temperature of 40±2 °C/75±5% RH) and non-accelerated (at ambient temperature) conditions. Assay of astaxanthin in individual TF-ASN was determined compared to pure astaxanthin. Results: TF-ASN had good physical and mechanical characteristics that suitable for intraoral administration. Conclusion: For the study of stability under different storage conditions, it was proven that nanoemulsion form was packed in a HPMC matrix could enhance the stability of the astaxanthin.

Research on Loose Circle Test of Deep Broken Roadway

2014 ◽  
Vol 638-640 ◽  
pp. 904-907 ◽  
Author(s):  
Feng Zhan Cui ◽  
Hua Jun Xue ◽  
Tian Yu He ◽  
Tao Tao Li ◽  
Jin Jing Zuo ◽  
...  
Keyword(s):  
Soft Rock ◽  
Surrounding Rock ◽  
Sonic Method ◽  
Single Hole ◽  
Deep Well ◽  
The Stability ◽  
Two Sides

To control the stability of deep well broken surrounding rock, single-hole sonic method is used to test the loose circle of-1180 east-rock main roadway and its damage range. The study indicates the loose circle is about 1.8 ~ 2.2 m, which is typical large loose circle. And its button is slightly larger than two sides’, right side slightly larger than left. The roadway rock has some engineering features of soft rock. The broken and expand deformation of loose circle does large, difficult to support. Combined support is usually used in this rock condition.

Experimental Analysis on Microstructure and Mineral Composition of Jurassic Soft Rock in Shajihai Mining Area of Xinjiang

2013 ◽  
Vol 353-356 ◽  
pp. 24-27
Author(s):  
Xiao Lei Wang ◽  
Shun Xi Yan ◽  
Hai Qiao Wen
Keyword(s):  
Mineral Composition ◽  
Soft Rock ◽  
Mining Area ◽  
Sem Analysis ◽  
Surrounding Rock ◽  
Test Results ◽  
X Ray Diffraction ◽  
Component Content ◽  
The Stability ◽  
Soft Rock Roadway

In order to find out themicroscopic structure and determine mineral composition and relative content ofroadway soft rock in Shajihai mining area, this paper carried out experimentsof scanning electron microscope (SEM) analysis and X-ray diffraction analysis.SEM test results show that the microstructure of the surrounding rock isgenerally poor and joint, crack, pore are developed. The crack is easy toexpand under the effect of surrounding rock pressure and water, which makesrock mass more broken and greatly reduces the stability of surrounding rock.X-ray diffraction analysis test shows that the component content of clayminerals in the surrounding rock is high. Clay mineral in mudstone containsmontmorillonite and content of illite/smectite mixed layer is relativelyhigher, up to 45%. In conclusion, soft rock roadway of Shajihai mine areabelongs to the typical swelling-jointed compound soft rock. The targeted andreasonable compound transformation technology and coupling support measuresmust be adopted when supporting.

Research of Fractured Surrounding Rock Physical and Mechanical Characteristics in Shuguang Mine No.2 Mining Area

2014 ◽  
Vol 580-583 ◽  
pp. 1364-1368 ◽  
Author(s):  
Hua Jun Xue ◽  
Jun Long Xue ◽  
Ming Lun Yin ◽  
Jie Kong ◽  
Zong Ming Gao
Keyword(s):  
Mechanical Characteristics ◽  
Friction Angle ◽  
Mining Area ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Strength ◽  
Important Basis ◽  
Surrounding Rock Deformation ◽  
Physical And Mechanical Characteristics

Since the excavation of roadway in Shuguang mine No.2 mining area, shotcrete layer has fallen off and the surrounding rock deformation was serious. For studying big deformation of roadway in Shuguang mine No.2 mining area, the paper analyzed fractured surrounding rock physical and mechanical characteristics of No.2 mining area. The results show that the uniaxial compressive strength, uniaxial tensile strength, cohesion, internal friction angle of fractured surrounding rock were very low. And the whole physical and mechanical characteristics were poor. It is the basic reason of big deformation of roadway surrounding rock physical and the important basis of late supporting of roadway.

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.

scholarly journals Road plates with increased strength characteristics

2018 ◽  
Vol 212 ◽  
pp. 05003 ◽  
Author(s):  
Igor Ivanov ◽  
Andrey Komarov ◽  
Victoria Rosina
Keyword(s):  
Service Life ◽  
Mechanical Characteristics ◽  
Strength Characteristics ◽  
Long Period ◽  
Fiber Concrete ◽  
Temperature And Humidity ◽  
Increased Strength ◽  
Physical And Mechanical Characteristics

The issues of creating road plates with increased operational properties are considered in this paper. Monolithic concrete has a number of disadvantages, such as a long period of strength accumulation, temperature and humidity regime, and the inability to produce works throughout the year. The analyzed material for the production of road slabs (fiber concrete) makes it possible to produce plates with increased strength characteristics, to prolong service life, and to improve their physical and mechanical characteristics.

Stress Distribution Characteristics in Rock Surrounding Heading Face and its Relationship with Temporary Supporting

2014 ◽  
Vol 568-570 ◽  
pp. 1684-1689
Author(s):  
Zhong Han Chen
Keyword(s):  
Coal Mine ◽  
Surrounding Rock ◽  
Zenith Distance ◽  
Rock Stability ◽  
Coal Roadway ◽  
Temporary Support ◽  
The Stability ◽  
Roadway Deformation ◽  
Mine Roof ◽  
Roof Deformation

To solve the problem of underground tunneling face from the empty top, using FLAC3D analysis software, surrounding rock stability for coal roadway 2-1121 of Ganhe Coal Mine are analyzed in numerical calculation. (1) During the tunneling, distance drivage face head-on 0.5-1m at the roof of roadway deformation and destruction features are more obvious, the two sides of roadway are even more significant. (2) Ganhe Coal Mine roof deformation has been established with different empty the experience formula of the zenith distance, obtained Ganhe underground tunneling face reasonable empty zenith distance is 3.5m. (3) Temporary support can obviously reduce roof deformation, reduce thickness of plastic zone of the top, to improve the stability of surrounding rock tunneling faces.

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