Correction to “New Type of Similar Material for Simulating the Processes of Water Inrush from Roof Bed Separation”

The emergency escape hatches of refuge cabin are usually installed in both sides of the life supporting compartment, which might cause the toxic gases or water enter into life supporting compartment when the gas explosion and water inrush accident occur. A new type of refuge cabin structure that can effectively resist the toxic gases and water entering the life supporting compartment is developed in this paper. Numerical simulation of antiknock impact performance of the new refuge cabin was calculated and analyzed by using the finite element software of LS-DYNA.The stress and strain distributions and maximum antiknock performance were obtained. Refuge chamber cabin has been optimized to reduce cost. The antiknock impact performance of optimized mine refuge chamber cabin can reach 1.4MPa which is greater than the 0.6MPa of standard value and the cost can be reduced approximate 19% than the original model.

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New Type Geo-Mechanical Similar Material Experiments Research and Its Application

Experimental Mechanics in Nano and Biotechnology - Key Engineering Materials ◽

10.4028/0-87849-415-4.1801 ◽

2006 ◽

pp. 1801-1804

Author(s):

Shu Cai Li ◽

H.P. Wang ◽

Qiang Yong Zhang ◽

Y. Li

Keyword(s):

Similar Material ◽

New Type

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Prediction and Prevention of Water Inrush Hazards from Bed Separation Space

Mine Water and the Environment ◽

10.1007/s10230-020-00748-w ◽

2021 ◽

Author(s):

Luyuan Wu ◽

Haibo Bai ◽

Dan Ma

Keyword(s):

Water Inrush ◽

Prediction And Prevention ◽

Bed Separation

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Research on the Height of Water-Flowing Fractured Zone under the Weak Roof Strata and Fully Mechanized Caving Condition

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1092-1093.1448 ◽

2015 ◽

Vol 1092-1093 ◽

pp. 1448-1454

Author(s):

Yan Zhang

Keyword(s):

Coal Mine ◽

Drilling Fluid ◽

Water Inrush ◽

Test Results ◽

Similar Material ◽

Fractured Zone ◽

Working Face ◽

Observation Method ◽

Roof Strata ◽

Similar Material Simulation

The first working face production has suspend because of the great roof water inrush in Mindongyi coal mine, which has weak roof strata and mining use the fully mechanized caving method. In order to detect the height of water-flowing fractured zone, loses of drilling fluid observation method has carried on the flied test, the results showed that while the full-mechanized caving mining thickness is 7.7 m, the height of water-flowing fractured zone is 79.78 m, and the ratio of height to thickness is 10.36, meanwhile, the numerical simulation and similar material simulation have proved the test results are correct. The study enriched the domestic research fruits of the height of water flowing fractured zone, and provided technical references for Mindongyi coal mine mining.

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Research on 3D Geomechanics Model Test for a Large-Scale Offspur Tunnel Project

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.326-328.557 ◽

2006 ◽

Vol 326-328 ◽

pp. 557-560

Author(s):

Qiang Yong Zhang ◽

Shu Cai Li ◽

X.H. Guo

Keyword(s):

Model Test ◽

Large Scale ◽

Similar Material ◽

Original Design ◽

Test Installation ◽

Deformation Properties ◽

Hydraulic Equipment ◽

New Type ◽

Design And Manufacture ◽

Test Rack

Geomechanics model test has some distinctive advantages in simulating changing laws of stress and strain of rockmass as well as failure mechanism of surrounding rockmass of tunnel. In order to systematically study mechanics deformation properties of a large-scale offspur tunnel under excavation state, we design and manufacture a large scale 3D model test rack installation with hydraulic equipment. The test rack is 3.7 meters long, 2.2 meters wide and 4 meters high, which is the largest 3D geomechanics model test rack in present Chinese communication trades. The new-type similar material of model is a kind of cementitious composite which is mixed with iron ore powder, blanc fix, quartz sand, rosin, industrial alcohol and gypsum powder. 3D geomechanics model test for a large-scale offspur tunnel is carried out by utilizing the test installation and the similar material. The original design and construction of the offspur tunnel has been effectively optimized by results from model test.

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More new exercises in plane geometry

Mathematics Teacher ◽

10.5951/mt.50.5.0330 ◽

1957 ◽

Vol 50 (5) ◽

pp. 330-339

Author(s):

_ _

Keyword(s):

Mathematics Teacher ◽

Plane Geometry ◽

Similar Material ◽

Wide Range ◽

Mathematics Student ◽

New Type

The stock of geometrical exercises of the new type introduced in the February 1957 issue of The Mathematics Teacher is here increased so that a wide range of suggested problems is opened to the teacher of geometry.This paper, the last in a series of five devoted to the cutting of squares, also supplements similar material inThe Mathematics Student Journal for April1957.

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New Type Geo-Mechanical Similar Material Experiments Research and Its Application

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.326-328.1801 ◽

2006 ◽

Vol 326-328 ◽

pp. 1801-1804

Author(s):

Shu Cai Li ◽

Han Peng Wang ◽

Qiang Yong Zhang ◽

Yong Li

Keyword(s):

Rock Mass ◽

Model Test ◽

Mechanical Model ◽

Iron Ore ◽

Material Research ◽

Similar Material ◽

Mechanics Model ◽

New Type ◽

Stable Performance ◽

The Ideal

It is very important to choose a similar material which simulates rock mass correctly in geo-mechanics model test. In this paper, we introduce similar material research status and analyze the principle of selecting and compounding. According to the experiences of similar material research, we develop a new similar material (we call it iron barites sand cementation material, abbreviate IBSCM) through hundreds of compounding experiment. This similar material is made up of iron ore powder, barites powder, sand, rosin, alcohol and gypsum powder. Iron ore powder, barites powder and sand are main materials, the solution of rosin and alcohol is glue, and gypsum powder is regulator. Specimen mechanics tests show that different rock mass can be simulated by the model materials with different materials compounding. The new similar material is easy to buy and its price is cheap, and it has some advantages, such as high density, stable performance, easy dryness, and easy cutting. The new similar material can simulate a lot of rock mass, so it is an ideal similar material. At last, we apply this new type similar material to tunnel geo-mechanical model test and gain the ideal result.

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Durability of a new type of cement-based composite grouting material under effects of chemical corrosion

Materials Express ◽

10.1166/mex.2020.1697 ◽

2020 ◽

Vol 10 (6) ◽

pp. 948-954

Author(s):

Zhaofeng Li ◽

Chunjin Lin ◽

Fei Sha ◽

Qingsong Zhang ◽

Jian Zhang ◽

...

Keyword(s):

Corrosion Resistance ◽

Water Inrush ◽

Steel Slag ◽

Chloride Ion ◽

Resistance Coefficient ◽

Chloride Ions ◽

Corrosion Mechanism ◽

Chemical Corrosion ◽

Grouting Material ◽

New Type

Corrosion resistance and durability are important performance features for grouting materials in underground engineering. The grouts based on ordinary Portland cement are difficult to solve water inrush disasters. To solve these problems, a new type of sulphoaluminate-cement-based Composite Grouting Material (CGM) has been developed. In this research, the chemical corrosion mechanism was analyzed, and the durability and anti-corrosion performance of CGM were studied under different concentrations of sulfate and chloride ions, steel slag contents and water/CGM (W/CGM) ratios. The flexural strength, compressive strength and corrosion resistance coefficient of CGM were measured in dependence of the days. Scanning electron microscopy (SEM) analysis was carried out to determine the anti-corrosion characteristic of CGM. The results showed that the corrosion resistance coefficients of CGM are generally larger than 1.0 under different sulfate and chloride ion concentrations. Steel slag prevents sulfate ions from penetrating the hardened stone body, and the anticorrosion performance of CGM was relatively low at high W/CGM ratios.

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