本文選題：時變邊界系統(tǒng) + 采場頂板��； 參考：《中國礦業(yè)大學(xué)》2015年博士論文

【摘要】：在煤層開采過程,工作面頂板發(fā)生準周期性破斷,故頂板屬于典型的時變邊界結(jié)構(gòu)。由于破斷位置事先未知,而且破斷后頂板位形的連通性也與初始狀態(tài)完全不同,故開采過程中頂板破斷行為超出了傳統(tǒng)固體力學(xué)的研究范圍。頂板的破斷過程伴隨著聲發(fā)射活動,聲發(fā)射技術(shù)是研究采場頂板破斷行為的有效手段。由于采礦工程領(lǐng)域中時變邊界問題普遍存在,環(huán)境保護和礦井災(zāi)害防治對時變邊界系統(tǒng)的研究提出迫切要求。本文通過物理模擬研究采場頂板的破斷過程,并利用聲發(fā)射技術(shù)確定破斷面位置和破斷時間,深入研究采場頂板的破斷規(guī)律。通過研究,取得如下創(chuàng)新性成果:(1)通過巖石聲發(fā)射試驗,得到了試驗機剛度和加載速率對聲發(fā)射信號參數(shù)影響的規(guī)律。(2)在分析采場頂板約束條件、受力條件、邊界變化特征和破斷過程的基礎(chǔ)上,設(shè)計了一套巖層破斷邊界時變聲發(fā)射試驗系統(tǒng),為研究頂板邊界時變破斷行為提供了試驗手段。(3)利用解除約束的方法實現(xiàn)頂板邊界的變化,引入壓力變化因子表征頂板底部約束解除的范圍。建立了頂板破斷位置、破斷時間和壓力變化因子的關(guān)系,得到了煤層原巖應(yīng)力對破斷面形成時間、破斷面間距、釋放能量的影響規(guī)律。(4)通過不同載荷條件下的頂板破斷過程的聲發(fā)射試驗,利用聲發(fā)射圖像診斷技術(shù),分析了頂板巖層的破斷方式,得到頂板巖層從脆性斷裂轉(zhuǎn)換為韌性斷裂的規(guī)律。(5)將圖像診斷技術(shù)應(yīng)用于聲發(fā)射信號參數(shù)分析,提出頂板巖層破斷面的聲發(fā)射圖像診斷定位方法。(6)通過頂板巖層的聲發(fā)射圖像診斷定位試驗,精確地確定了時變邊界巖層的各個破斷面區(qū)域和破斷時間。
[Abstract]:In the process of coal seam mining, the roof of the working face is broken in a quasi-periodic manner, so the roof belongs to the typical time-varying boundary structure. Because the breaking position is unknown in advance and the connectivity of roof configuration after breaking is completely different from the initial state, the roof breaking behavior in mining process is beyond the scope of traditional solid mechanics. The breaking process of roof is accompanied by acoustic emission activity. Acoustic emission technology is an effective means to study roof breaking behavior in stope. Due to the existence of time-varying boundary problems in mining engineering, the study of time-varying boundary system is urgently required by environmental protection and mine disaster prevention. In this paper, the breaking process of stope roof is studied by physical simulation, and the breaking section position and breaking time are determined by acoustic emission technique, and the breakage law of stope roof is deeply studied. Through the research, the following innovative achievement is obtained: 1) through the rock acoustic emission test, the regularity of the influence of the stiffness and loading rate of the testing machine on the acoustic emission signal parameters is obtained. 2) the constraint condition and the force condition of the roof of the stope are analyzed. Based on the characteristics of boundary change and fracture process, a set of acoustic emission test system for rock layer breaking boundary is designed, which provides a test means for studying the time-varying breaking behavior of roof boundary. The method of lifting constraints is used to realize the change of roof boundary. The pressure variation factor is introduced to indicate the range of lifting constraints at the bottom of the roof. The relationship between roof breaking position, breaking time and pressure change factor is established, and the time of formation of original rock stress to breaking section and the interval between broken sections are obtained. Through acoustic emission test of roof breaking process under different loading conditions and using acoustic emission image diagnosis technology, the breaking mode of roof rock is analyzed. The rule of roof rock layer transforming from brittle fracture to ductile fracture is obtained. The image diagnosis technique is applied to the parameter analysis of acoustic emission signal. In this paper, the acoustic emission image diagnosis and localization method of broken section of roof rock layer is put forward. By means of acoustic emission image diagnosis localization test of roof rock layer, each broken section area and breaking time of time-varying boundary rock layer are accurately determined.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TD327.2

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