外文翻譯--煤巷中相似模擬錨桿支護(hù)的構(gòu)造應(yīng)力場(chǎng)-資料下載頁(yè)
2025-05-12 06:20本頁(yè)面
【導(dǎo)讀】邊幫的構(gòu)造應(yīng)力、變形和破壞，而進(jìn)行的一個(gè)仿真的實(shí)驗(yàn)。我們還研究了機(jī)械原。結(jié)果表明，隨著水平構(gòu)造應(yīng)力的增加，地層在頂。板和底板的道路逐漸分開,并成為區(qū)域剪切破壞。煤炭的邊幫是波動(dòng)，但其完整。性仍然完好無損。目前主要應(yīng)用于錨桿支護(hù)煤巷。地層特性的不同受到構(gòu)造應(yīng)力影響不同。究表明構(gòu)造應(yīng)力可以近似看作是水平應(yīng)力。在國(guó)內(nèi)外，已經(jīng)進(jìn)行了相當(dāng)多的巷道。然而，很少有研究錨桿支護(hù)機(jī)理中存在的構(gòu)造應(yīng)力。和指導(dǎo)，有利于接近生產(chǎn)、確保安全開采實(shí)踐。相似模擬實(shí)驗(yàn)，我們?cè)跇?gòu)造應(yīng)力場(chǎng)中研究了三種地層特性的煤層巷道。相似實(shí)驗(yàn)包括4個(gè)方案：在每個(gè)方案中施加的垂直壓力在巷道上。允許水平構(gòu)造應(yīng)力增加，，至，側(cè)壓力系數(shù)從，，1）、模擬火焰的長(zhǎng)度，寬度和厚度分別為，和米。鑒于我們的實(shí)驗(yàn)結(jié)果，不同層次的構(gòu)造應(yīng)力巷道表面位移如表2所示。表2顯示，受到越來越多的構(gòu)造應(yīng)力，巷道頂板位移收斂到最大。在構(gòu)造應(yīng)力作用下，有可能成為剪切破壞區(qū)。
【正文】 olt smallest． With an increase in the side pressure coefficient， the tension in the bolts gradually increases． When the side pressure coefficient λ2． 0， the load on the bolts changes little． The roof bolts are deformed mainly because of shear． The length of the extension of the lead wire is small， so that the change in resistance of the bolts is also small． Under the effect of tectonic stress， the roof and floor strata are likely to bee shear failure areas． There is a loose swell caused by dislocation， causing deformation in the surrounding rock． The function of the bolts is to constrain the strata from swelling along the axis and to prevent shear perpendicular to the axis． Therefore， the bolts must have properties of high strength， high stiffness and a high shear force， so that it can restrain deformation of the rock． Fig． 5 Changes in electrical signals in bolts This analysis shows that side bolts largely control the sides of the roadway in order to prevent deformation into the roadway space and that roof bolts mainly control shear failure of the roadway． When the rocks are destroyed， the bolts provide the binding force and increase the residual strength of the rocks． In the design of bolt support， we should select bolts with strong tensile ability and high elongation as side bolts， in order to release some deformation energy and which are adaptable to large deformations of the coalin side walls． Bolts with high antishear ability and high stiffness should be selected for roof bolts， to prevent separation， dislocation and shear failure of roof strata． 5 Conclusions From our similarity simulation of bolt support for a coal roadway in a tectonic stress field， we conclude the following． 1)With an increase in tectonic stress， the destruction of the roadway rock accelerates， there is dislocation between the strata in the roof and floor of the roadway and separation between strata gradually increases， 1eading to strata weakness because of shear and a loss of bending ability。 In the end， the strata of the roof and floor bee shear failure areas， where roof bolts lose their support function and roof strata gradually fall into arches． Coal from the side walls moves into the roadway,the dislocation and displacement of the roof strata increases， leaving however the integrity of the side coal intact． 2） Side bolts deformed mainly because of tension． When the load on the upper shoulder bolt is large， theload on the lower bolt is small． When the side pressure coefficient λ2． 0， the load on the bolts changes little and the roof bolts deform mainly because of shear． When the strata are destroyed， roof bolts provide a binding force and increase the residual strength of rocks． 3)The collapse of the roadway roof is the worst incident． The coal in the side walls of the roadway and in the roof and floor strata slide along each other and moves into the roadway space． Plastic Dilatancy of the coal in the side walls is obvious． With an increase in the side pressure coefficient， the surface displacement rapidly deforms the roadway． After the destruction of the roof and floor by shearing． the surface displacement increases greatly． Acknowledgements Financial support for this work， provided by the Research Fund of the State Key Laboratory of Coal Resources and Mine Safety of the China University of Miningamp。Technology(No． 08kfl 1)is gratefully acknowledged．
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