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)(文件)
【正文】 meters and material ponent ratios are shown in Table l and the experimental model in Fig． 2． Fig． 2 Experimental simulation model Table 1 Model parameters and material ponent ratios 3． 3 Data monitoring Given the objective of the experiment， we needed to monitor the surface displacement of the roadway and forces acting on the bolt． The layout of the monitoring equipment is shown in Fig． 3． A displacement meter was placed on the surface of the roadway,with a bolt buried inside the rock in advance． Using a φ 1． 8 mm lead wire to simulate a bolt,a copper wire was attached to both ends of the lead wire ， leading to the outside of the model and connected to the TS3890A programmable static resistance strain gauge． Measuring the electric signals of the lcad wire reflects the condition of the force to the lead： the larger the pulling force exerted on the lead wire， the thinner it bees and the larger the resistance， the smaller the electric current． Fig． 3 Disposition of the measurement device 4 Results and discussion Destruction of the rock surrounding a coal roadway Under the effect of different tectonic stresses， the state of destruction of the rock of the coal roadway is shown in Fig． 4． The result of the experiment shows that when the side pressure coefficientλ=0． 5， the rock extrudes into the roadway； there is a little dislocation between the strata in the roof and floor,but the rock remains plete． When λ=1． 0． the dislocation between the strata in the roof and floor increases， the soft stratum and the hard stratum above the roadway have separated and the roadway rock extrudes further inside the roadway． When λ=． the roof of the roadway gradually bees a shear failure area； when λ=2． 0， the soft strata of the roadway roof begin to fall， the floor also bees a shear failure area， while the dislocation between different strata bees more obvious． When λ=3． 0， the roof falling on the roadway curves upward and bees approximately an arch． Shear failure of the floor continues to enlarge， the dislocation between the strata increases。Technology(No． 08kfl 1)is gratefully acknowledged． 。with the increase of horizontal tectonic stress ， the destruction of the rock surrounding the roadway bees worse； there is dislocation between the strata in both the roof and floor,separation between strata gradually increases， the shear and bending ability of the strata weakens and finally the strata in the roof and floor bee shear failure areas， causing the roof bolts to lose their support function． The roof strata gradually fall into an arch； the coal in the side walls shows an overall tendency to move towards the roadway space． The dislocation between the immediate roof and coal gradually increases， although the integrity of the coal in the side walls remains intact． 4． 2 Surface displacement of coal roadway Given our experimental results， the surface displacement of the roadway is shown in Table 2 under different levels of tectonic stress． Table 2 Displacement of the roadway surface Table 2 shows that under increasing tectonic stress， the roof displacement of the roadway converges to a maximum． The coal of the side walls of the roadway and in the roof and floor strata slide along each other and the coal from the side walls moves into the roadway space and plastic Dilatancy of the coal in the walls bee obvious． With an increase in the side pressure coefficie
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