【摘要】：隨著我國(guó)煤礦開采強(qiáng)度和深度的不斷增加,由動(dòng)載誘發(fā)的沖擊礦壓災(zāi)害也逐漸增加。相似模擬試驗(yàn)作為重要實(shí)驗(yàn)室研究手段之一,在國(guó)內(nèi)外一些研究單位已開展了沖擊動(dòng)載方面的試驗(yàn)和探索。但從沖擊動(dòng)載對(duì)圍巖的破壞效應(yīng)和破壞特點(diǎn)的角度進(jìn)行研究的較少,且動(dòng)載大多采用爆破模擬的形式。為此,本文以動(dòng)靜載荷組合加載相似模擬試驗(yàn)為主要研究手段,結(jié)合理論分析、數(shù)值模擬等方法,對(duì)采動(dòng)動(dòng)載誘導(dǎo)圍巖變形破壞的特征進(jìn)行了研究。主要結(jié)論如下:基于沖擊礦壓動(dòng)靜載疊加原理及相似理論,分析了圍巖動(dòng)、靜載應(yīng)力條件。依據(jù)相似理論,分析了動(dòng)靜載的特點(diǎn)及動(dòng)載的相似性,分析比較了相似比例系數(shù),在MLT系統(tǒng)中對(duì)弗洛德比尺因數(shù)中的主要變量量綱進(jìn)行分析,確定了相似模擬試驗(yàn)的比尺因數(shù)并對(duì)其量綱進(jìn)行分析驗(yàn)證。以急傾斜煤層地質(zhì)條件為基礎(chǔ)設(shè)計(jì)并完成了相似模擬試驗(yàn),探究采場(chǎng)圍巖的應(yīng)力分布特點(diǎn)及采動(dòng)動(dòng)載對(duì)其變形破壞的影響,并確定了圍巖沖擊破壞加速度、位移臨界值。結(jié)果表明:同一水平分層,煤層底板左側(cè)應(yīng)力集中程度最高,且隨著動(dòng)載強(qiáng)度的增大,圍巖響應(yīng)特征更加明顯,當(dāng)模擬能量為3.92×10~5J時(shí)發(fā)生沖擊顯現(xiàn)。相同動(dòng)載強(qiáng)度時(shí),隨著傳播距離的增加,響應(yīng)特征逐漸減弱,但傳播距離差別不大時(shí)應(yīng)力條件成為了響應(yīng)大小的決定因素。同時(shí),對(duì)采動(dòng)動(dòng)載誘導(dǎo)巷道圍巖變形破壞進(jìn)行了相似模擬試驗(yàn)研究。結(jié)果表明:巷道模型中應(yīng)力對(duì)稱分布,頂?shù)装遄�、右�?cè)靜載應(yīng)力相同,中部應(yīng)力較低。動(dòng)載強(qiáng)度增大導(dǎo)致圍巖變形破壞更為嚴(yán)重。相同動(dòng)載時(shí),由于試驗(yàn)設(shè)備動(dòng)載形式限制,巷道“迎載側(cè)”受動(dòng)載影響最大,加速度、聲發(fā)射事件更為明顯,且模擬能量9.00×10~4J時(shí)發(fā)生沖擊破壞,“背載側(cè)”響應(yīng)程度略有衰弱,但總體仍處于較高水平,而處于徑向位置的巷道拱頂受擾動(dòng)最小。利用FLAC~(2D)數(shù)值模擬軟件進(jìn)行了對(duì)照模擬試驗(yàn)分析。結(jié)果表明:動(dòng)載傳遞過(guò)程中在介質(zhì)中將發(fā)生反射和透射,從而引起煤巖應(yīng)力變化,動(dòng)載強(qiáng)度越高,誘發(fā)圍巖變形破壞越嚴(yán)重。相同動(dòng)載強(qiáng)度時(shí),由于圍巖自由空間方向限制,巷道頂?shù)装逶诖怪狈较蛏享憫?yīng)特征更為明顯,而左右兩幫在水平方向變形破壞更為嚴(yán)重,且由于反射作用左側(cè)煤壁處變形破壞程度高于內(nèi)部圍巖。巷道“迎載側(cè)”區(qū)域受動(dòng)載影響較大,響應(yīng)特征較為明顯。數(shù)值模擬分析與相似模擬試驗(yàn)結(jié)果一致,耦合性較好。
[Abstract]:With the increasing intensity and depth of coal mining in China, the impact rock pressure disaster induced by dynamic load also increases gradually. As one of the important laboratory research methods, similar simulation test has been carried out in some domestic and foreign research institutions in the field of impact dynamic load test and exploration. However, there are few studies on the failure effect and characteristics of the surrounding rock by impact dynamic load, and most of the dynamic loads are in the form of blasting simulation. Therefore, in this paper, the characteristics of deformation and failure of surrounding rock induced by mining dynamic load are studied by means of similar simulation test under combined static and static loads, combined with theoretical analysis, numerical simulation and other methods. The main conclusions are as follows: based on the statically static loading superposition principle and similarity theory, the dynamic and static loading stress conditions of surrounding rock are analyzed. According to the similarity theory, the characteristics of dynamic load and the similarity of dynamic load are analyzed and compared. The dimension of main variables in Froude scale factor is analyzed in MLT system. The scale factor of similar simulation test is determined and its dimension is analyzed and verified. Based on the geological conditions of steep inclined coal seam, similar simulation tests are designed and completed. The stress distribution characteristics of surrounding rock of stope and the influence of mining dynamic load on its deformation and failure are discussed, and the acceleration and displacement critical value of surrounding rock shock failure are determined. The results show that the stress concentration on the left side of coal seam floor is the highest with the same horizontal stratification, and with the increase of dynamic load strength, the response characteristics of surrounding rock are more obvious. When the simulated energy is 3.92 脳 10 脳 10 ~ 5 J, the shock appears. At the same dynamic load intensity, the response characteristics gradually weaken with the increase of the propagation distance, but the stress condition becomes the decisive factor of the response size when the propagation distance difference is not small. At the same time, similar simulation tests are carried out to study the deformation and failure of surrounding rock induced by mining dynamic load. The results show that the stress is symmetrically distributed in the tunnel model with the same static stress on the left and right sides of the roof and floor and the lower stress in the middle of the tunnel. The deformation and failure of surrounding rock is more serious due to the increase of dynamic load strength. Under the same dynamic load, due to the limitation of the dynamic load form of the test equipment, the influence of the dynamic load on the "uploading side" of the roadway is the greatest, the acceleration and acoustic emission events are more obvious, and the impact failure occurs when the simulated energy is 9.00 脳 10 脳 10 ~ 4J. The response degree of "back loading side" is a little weak, but it is still at a higher level, while the radial position of tunnel arch is the least disturbed. The FLAC~ (2D) numerical simulation software is used to carry out the comparative simulation test analysis. The results show that the reflection and transmission will occur in the medium during dynamic load transfer, which will cause the change of coal and rock stress. The higher the dynamic load strength, the more serious the deformation and failure of the surrounding rock will be induced. Under the same dynamic load strength, due to the limitation of the free space direction of the surrounding rock, the response characteristics of the roof and floor of the roadway are more obvious in the vertical direction, and the deformation and damage of the left and right sides are more serious in the horizontal direction. The deformation and failure degree of the left coal wall is higher than that of the internal surrounding rock due to reflection. The response characteristics are more obvious in the area of "welcoming side" of roadway under the influence of dynamic load. The numerical simulation analysis is consistent with the similar simulation test results, and the coupling is good.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD324

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 竇林名;何江;曹安業(yè);鞏思園;蔡武;;煤礦沖擊礦壓動(dòng)靜載疊加原理及其防治[J];煤炭學(xué)報(bào);2015年07期

2 王正義;竇林名;王桂峰;;動(dòng)載作用下圓形巷道錨桿支護(hù)結(jié)構(gòu)破壞機(jī)理研究[J];巖土工程學(xué)報(bào);2015年10期

3 曹磊;李基;姬玉成;黃建功;;急傾斜特厚煤層采場(chǎng)圍巖運(yùn)動(dòng)相似材料模擬[J];礦業(yè)工程研究;2015年01期

4 劉少虹;毛德兵;齊慶新;李鳳明;;動(dòng)靜加載下組合煤巖的應(yīng)力波傳播機(jī)制與能量耗散[J];煤炭學(xué)報(bào);2014年S1期

5 姜耀東;潘一山;姜福興;竇林名;鞠楊;;我國(guó)煤炭開采中的沖擊地壓機(jī)理和防治[J];煤炭學(xué)報(bào);2014年02期

6 朱海龍;張新戰(zhàn);鄒銀輝;來(lái)興平;單鵬飛;;急傾斜特厚煤層采場(chǎng)巷道圍巖松動(dòng)圈測(cè)試研究[J];煤礦安全;2013年12期

7 宮鳳強(qiáng);陸道輝;李夕兵;饒秋華;;不同應(yīng)變率下砂巖動(dòng)態(tài)強(qiáng)度準(zhǔn)則的試驗(yàn)研究[J];巖土力學(xué);2013年09期

8 金解放;李夕兵;鐘海兵;;三維靜載與循環(huán)沖擊組合作用下砂巖動(dòng)態(tài)力學(xué)特性研究[J];巖石力學(xué)與工程學(xué)報(bào);2013年07期

9 呂祥鋒;王振偉;潘一山;;煤巖巷道沖擊破壞過(guò)程相似模擬試驗(yàn)研究[J];實(shí)驗(yàn)力學(xué);2012年03期

10 王光勇;顧金才;陳安敏;徐景茂;;頂爆作用下錨桿破壞形式及破壞機(jī)制模型試驗(yàn)研究[J];巖石力學(xué)與工程學(xué)報(bào);2012年01期

相關(guān)博士學(xué)位論文 前10條

1 杜坤;真三軸卸載下深部巖體破裂特性及誘發(fā)型巖爆機(jī)理研究[D];中南大學(xué);2013年

2 何江;煤礦采動(dòng)動(dòng)載對(duì)煤巖體的作用及誘沖機(jī)理研究[D];中國(guó)礦業(yè)大學(xué);2013年

3 徐學(xué)鋒;煤層巷道底板沖擊機(jī)理及其控制研究[D];中國(guó)礦業(yè)大學(xué);2011年

4 宮鳳強(qiáng);動(dòng)靜組合加載下巖石力學(xué)特性和動(dòng)態(tài)強(qiáng)度準(zhǔn)則的試驗(yàn)研究[D];中南大學(xué);2010年

5 鞏思園;礦震震動(dòng)波波速層析成像原理及其預(yù)測(cè)煤礦沖擊危險(xiǎn)應(yīng)用實(shí)踐[D];中國(guó)礦業(yè)大學(xué);2010年

6 曹安業(yè);采動(dòng)煤巖沖擊破裂的震動(dòng)效應(yīng)及其應(yīng)用研究[D];中國(guó)礦業(yè)大學(xué);2009年

7 李志華;采動(dòng)影響下斷層滑移誘發(fā)煤巖沖擊機(jī)理研究[D];中國(guó)礦業(yè)大學(xué);2009年

8 陳國(guó)祥;最大水平應(yīng)力對(duì)沖擊礦壓的作用機(jī)制及其應(yīng)用研究[D];中國(guó)礦業(yè)大學(xué);2009年

9 陸菜平;組合煤巖的強(qiáng)度弱化減沖原理及其應(yīng)用[D];中國(guó)礦業(yè)大學(xué);2008年

10 趙伏軍;動(dòng)靜載荷耦合作用下巖石破碎理論及試驗(yàn)研究[D];中南大學(xué);2004年

，

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