本文選題：爆破損傷 + 相似模擬　； 參考：《山東理工大學(xué)》2015年碩士論文

【摘要】：蘭陵石膏集團(tuán)大漢礦-580m水平礦層開采存在地壓顯現(xiàn)明顯,爆破對(duì)圍巖損傷較大的現(xiàn)象,以傳統(tǒng)的經(jīng)驗(yàn)類比法設(shè)計(jì)采場(chǎng)參數(shù)難以滿足安全生產(chǎn)的要求。通過調(diào)查研究該礦山的地質(zhì)條件、巖體性質(zhì)以及開采現(xiàn)狀,并在礦山現(xiàn)場(chǎng)和實(shí)驗(yàn)室進(jìn)行擾動(dòng)試驗(yàn)研究以確定爆破載荷作用下圍巖的損傷規(guī)律及弱化效應(yīng),依據(jù)試驗(yàn)結(jié)果折減礦山巖體參數(shù),確定采場(chǎng)圍巖的物理力學(xué)參數(shù)。使用FLAC3D模擬軟件設(shè)計(jì)采場(chǎng)結(jié)構(gòu)參數(shù)并對(duì)采場(chǎng)結(jié)構(gòu)穩(wěn)定性進(jìn)行分析,最終確定大漢石膏礦-580m水平礦床的采礦方法、采場(chǎng)布置參數(shù)等,保證礦山深部的安全生產(chǎn),同時(shí)為類似礦山提供參考。現(xiàn)場(chǎng)試驗(yàn)通過小爆破的形式進(jìn)行,采用跨孔聲波測(cè)試,得出圍巖爆破的影響深度約為175cm~225cm,不是每次爆破都會(huì)使圍巖產(chǎn)生宏觀上的損傷,甚至有時(shí)候會(huì)發(fā)生局部裂隙閉合或壓密現(xiàn)象,爆破對(duì)圍巖承載區(qū)損傷較大。爆破損傷室內(nèi)試驗(yàn)是依據(jù)礦山實(shí)測(cè)的爆破頻率、峰值振動(dòng)速度以及振動(dòng)持續(xù)時(shí)間等數(shù)據(jù),在石膏試件單軸抗壓強(qiáng)度40%、60%和80%的靜載荷下進(jìn)行的。試驗(yàn)得出不同靜載荷水平下,石膏礦石的擾動(dòng)損傷規(guī)律符合對(duì)數(shù)函數(shù)。在單軸抗壓強(qiáng)度80%應(yīng)力水平下,石膏試件經(jīng)過50次的擾動(dòng)破壞后,其完整性系數(shù)最低為0.64。依據(jù)爆破損傷試驗(yàn)結(jié)果對(duì)巖石參數(shù)進(jìn)行折減,確定采場(chǎng)巖體參數(shù),通過材料力學(xué)“梁”理論、以及FLAC3D數(shù)值模擬,確定采場(chǎng)結(jié)構(gòu)參數(shù)。依據(jù)臨界強(qiáng)度理論、FLAC3D動(dòng)應(yīng)力分析評(píng)價(jià)礦山采空區(qū)的穩(wěn)定性。最終確定采用分層淺孔房柱采礦法,礦層分2個(gè)分段回采,分段采高8m,采寬為5m,采長(zhǎng)為50m,礦柱寬度為8m,留設(shè)1.5m護(hù)頂層和1m護(hù)底層,層間柱寬度為5m。
[Abstract]:In the mining of -580m horizontal seam of Lanling Gypsum Group, there is a phenomenon that the ground pressure appears obviously and the blasting damages the surrounding rock. It is difficult to design the stope parameters by the traditional experience analogy method to meet the requirements of safe production. The geological conditions, rock mass properties and mining status of the mine are investigated, and disturbance tests are carried out in the mine site and laboratory to determine the damage law and weakening effect of surrounding rock under blasting load. The physical and mechanical parameters of surrounding rock in stope are determined by reducing the rock mass parameters according to the test results. The structural parameters of stope are designed by using FLAC3D software and the stope structure stability is analyzed. Finally, the mining method and stope layout parameters of -580m horizontal ore deposit in Dahan gypsum mine are determined to ensure the safe production in the deep part of the mine. It also provides reference for similar mines. The field test was carried out in the form of small blasting, and the cross hole acoustic wave test was adopted. It was concluded that the influence depth of surrounding rock blasting was about 175 cm ~ 225cm, and not every blasting would cause macroscopic damage to the surrounding rock. Sometimes even the local fissure closure or compaction occurs, blasting damage to the surrounding rock bearing area. The laboratory test of blasting damage is carried out under the static load of 40% and 80% uniaxial compressive strength of gypsum specimen according to the measured data of blasting frequency, peak vibration velocity and vibration duration. The results show that the disturbance damage law of gypsum ore accords with logarithmic function under different static load levels. Under the stress level of 80% uniaxial compressive strength, the integrity coefficient of gypsum specimen is the lowest 0.64 after 50 times of disturbance failure. According to the results of blasting damage test, the rock parameters are reduced and the parameters of stope rock mass are determined. The structural parameters of stope are determined by the theory of "beam" of mechanics of materials and the numerical simulation of FLAC3D. The stability of goaf is evaluated by FLAC3D dynamic stress analysis based on critical strength theory. Finally, the method of stratified shallow hole roof pillar mining is adopted, the ore bed is divided into two sections, the mining height is 8 m, the mining width is 5 m, the mining length is 50 m, the pillar width is 8 m, the top and bottom layers are kept at 1.5 m and the width of the interlayer column is 5 m.
【學(xué)位授予單位】：山東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD876.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 劉亮輝;;邵東石膏礦采空區(qū)充填治理工程探討[J];科技情報(bào)開發(fā)與經(jīng)濟(jì);2011年30期

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本文編號(hào)：1904932