Study on Mechanics Model and Stress Evolution Law of Filling Stope

2011 ◽  
Vol 121-126 ◽  
pp. 428-432
Author(s):  
Jin Xiao Liu ◽  
Wei Jia Guo ◽  
Wen Bin Sun ◽  
Xin Guo Zhang
Keyword(s):  
Mechanical Parameters ◽  
Stress Evolution ◽  
Evolution Law ◽  
Basic Model ◽  
Mechanics Model ◽  
Movement And Deformation ◽  
Relationship Of ◽  
The Relationship ◽  
Body Support ◽  
Overlying Strata

The paper sets up mechanical model according to the characteristics of paste filling stope and determines the basic model units which are overlying strata, filling body, support and floor. The paper also establishes the mechanical parameters for controlling movement and deformation of overlying strata and sets up the relationship of all mechanical parameters. Based on this, the paper studies the stress evolution law under the condition of different filling ratio and filling step distance with the method of numerical simulation.

Research Foundation of Rock-Burst Hazard Control for Mining Pattern with No Pillar

2010 ◽  
Vol 156-157 ◽  
pp. 207-210
Author(s):  
Zhi Jie Wen ◽  
Lian Jun Chen ◽  
Xiao Dong Zhao ◽  
Chuan Zhang
Keyword(s):  
Rock Burst ◽  
Abutment Pressure ◽  
Relevant Information ◽  
Mechanics Model ◽  
Working Face ◽  
Hazard Control ◽  
Time Space ◽  
Relationship Of ◽  
The Relationship ◽  
Realization Condition

In order to effectively prevent the rock burst occurrence for mining patter with no pillar, the reason and its realization condition of rock burst were studied; the stope structure mechanics model with working face mining was built; four phases of rock burst occurrence with mining were proposed; the relationship between rock burst occurrence and abutment pressure law of development was analyzed, time-space coupling relationship of rock burst and its relevant information for rock burst control were obtained.

Analysis on Ground Subsidence in Underground Mining

2011 ◽  
Vol 383-390 ◽  
pp. 2201-2205
Author(s):  
Xin Xi Liu ◽  
Xue Zhi Wang
Keyword(s):  
Underground Mining ◽  
Ground Deformation ◽  
Coal Pillar ◽  
Mining Area ◽  
Ground Subsidence ◽  
Recovery Coefficient ◽  
Mining Width ◽  
Movement And Deformation ◽  
Relationship Of ◽  
The Relationship

Analysis on the characters of ground subsidence of Yangjiaping mining area, with same excavation depth and recovery coefficient, the numerical simulations to nonlinear large deformation using finite-difference method(FLAC) are achieved on the different strip extraction schemes that adopted different mining and reservation width. The result indicates that the subsidence values and horizontal deformation increases with the increasing of the strip extraction width on condition of the same recovery rate. Based on probability density function (PDF) method, the relationship of the coal pillar width, the mining width and ground deformation is acquired, which is some useful reference for using the strip extraction method to control the surface movement and deformation.

Movement and Deformation Rules of Gauss Coordinates Based on Ellipsoid Expanded Modal

2011 ◽  
Vol 368-373 ◽  
pp. 2211-2215
Author(s):  
Li Xin Jin ◽  
Lian Jun Wang ◽  
Song Lin Yang
Keyword(s):  
Theoretical Foundation ◽  
Geodetic Coordinates ◽  
Geodetic Height ◽  
Longitudinal Coordinate ◽  
Movement And Deformation ◽  
Major Radius ◽  
Straight Lines ◽  
Relationship Of ◽  
The Relationship ◽  
Derivatives Of

This paper studies on deducing the analytic formulae on Gauss coordinates displacement before or after the increase of major radius of ellipsoid expanded modals, which is based on the partial derivatives of geodetic coordinates in Gauss coordinates deducing from direct solution formulae of the Gauss projection coordinates in conjunction with differential coefficient formulae and variable of geodetic coordinates. On this theoretical foundation, analyzing the relationships between Gauss coordinates displacement and other mathematical parameter . The relationship of graphics between point displacement components of latitudinal coordinate dy and longitudes is similar to the straight lines. The relationship of graphics between point displacement components of longitudinal coordinate dx and latitudinal coordinate dy, and the geodetic height is similar to the straight lines.

Dependency Theory and the Soviet-East European Hierarchical Regional System: Initial Tests

Slavic Review ◽  
1978 ◽  
Vol 37 (4) ◽  
pp. 604-623 ◽  
Author(s):  
William Zimmerman
Keyword(s):  
World War Ii ◽  
International Politics ◽  
World Politics ◽  
Dependency Theory ◽  
East European ◽  
Basic Model ◽  
Prevailing Paradigm ◽  
Economic Imperialism ◽  
Relationship Of ◽  
The Relationship

Throughout the post-World War II period, the prevailing paradigm of international politics among Western scholars has assumed that the major task confronting the decisionmakers of all states is achieving security in an anarchic state system. It follows from this assumption that relations between relatively equal superpowers constitute, in Arnold Wolfers's phrase, “the relationship of major tension” in the postwar world. In the 1970s, however, there has been a revival among Western scholars of an alternative perspective on world politics: the theory of economic imperialism, or, as it is usually labeled in the 1970s, “dependency theory.” It is a perspective which focuses on unequal relations between states. In that perspective, “the basic model of international politics [is] the imperialist system that was centered upon states of unequal economic development,“ where “the relationship of major tension was between the developed and underdeveloped economies.“

Research on the Overlying Strata and Grouting Range Structural Mechanics Model of Abscission Layer Grouting

2012 ◽  
Vol 608-609 ◽  
pp. 1801-1804
Author(s):  
Wen Yu Lv ◽  
Zhi Hui Zhang
Keyword(s):  
Mine Waste ◽  
Influence Factors ◽  
Structural Mechanics ◽  
Abscission Layer ◽  
Filling Materials ◽  
Mechanics Model ◽  
Surface Subsidence Control ◽  
The Relationship ◽  
Main Influence ◽  
Overlying Strata

Abscission layer grouting is a new filling technology of surface subsidence control, it can protect environment because of using mine waste as filling materials, The paper establishes the overlying strata structural mechanics model of abscission layer grouting, it analyzes the main influence factors of overlying strata abscission layer development and the relationship between overlying strata structure and abscission layer, it also establishes and studies the grouting range structural mechanics model of abscission layer grouting.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

Studies on Leukemogenic and Sarcomagenic Viruses

1970 ◽  
Vol 28 ◽  
pp. 156-157
Author(s):  
Leon Dmochowski
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Morphological Properties ◽  
Mode Of Development ◽  
Relationship Of ◽  
The Relationship

Electron microscopy has proved to be an invaluable discipline in studies on the relationship of viruses to the origin of leukemia, sarcoma, and other types of tumors in animals and man. The successful cell-free transmission of leukemia and sarcoma in mice, rats, hamsters, and cats, interpreted as due to a virus or viruses, was proved to be due to a virus on the basis of electron microscope studies. These studies demonstrated that all the types of neoplasia in animals of the species examined are produced by a virus of certain characteristic morphological properties similar, if not identical, in the mode of development in all types of neoplasia in animals, as shown in Fig. 1.

The relationship of IGE receptor topography to signaling activity in RBL-2H3 mast cells

1991 ◽  
Vol 49 ◽  
pp. 236-237
Author(s):  
J.R. Pfeiffer ◽  
J.C. Seagrave ◽  
C. Wofsy ◽  
J.M. Oliver
Keyword(s):  
Mast Cells ◽  
Protein A ◽  
Scattered Electron ◽  
Ige Receptor ◽  
Receptor Complexes ◽  
Ige Binding ◽  
Electron Imaging ◽  
Small Clusters ◽  
Relationship Of ◽  
The Relationship

In RBL-2H3 rat leukemic mast cells, crosslinking IgE-receptor complexes with anti-IgE antibody leads to degranulation. Receptor crosslinking also stimulates the redistribution of receptors on the cell surface, a process that can be observed by labeling the anti-IgE with 15 nm protein A-gold particles as described in Stump et al. (1989), followed by back-scattered electron imaging (BEI) in the scanning electron microscope. We report that anti-IgE binding stimulates the redistribution of IgE-receptor complexes at 37“C from a dispersed topography (singlets and doublets; S/D) to distributions dominated sequentially by short chains, small clusters and large aggregates of crosslinked receptors. These patterns can be observed (Figure 1), quantified (Figure 2) and analyzed statistically. Cells incubated with 1 μg/ml anti-IgE, a concentration that stimulates maximum net secretion, redistribute receptors as far as chains and small clusters during a 15 min incubation period. At 3 and 10 μg/ml anti-IgE, net secretion is reduced and the majority of receptors redistribute rapidly into clusters and large aggregates.

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