【摘要】：水巖作用一直是目前巖石力學(xué)研究的熱點(diǎn)和難點(diǎn)之一。砂巖作為煤炭開采過程中一種常見的巖石類型,其力學(xué)性質(zhì)涉及到煤炭開采過程的各個(gè)方面。此外,水-巖作用下,巖體各方面性質(zhì)也受到不同程度的影響。目前,國內(nèi)外的研究主要集中于某類巖石的干燥、自然、飽和三種特殊狀態(tài),且只考慮了水對(duì)某種特定巖石性質(zhì)的影響,而忽略了巖石本身的性質(zhì)。本文研究了水作用下不同粒徑類巖試樣力學(xué)性質(zhì)和破壞形態(tài),以期揭示水作用下巖石強(qiáng)度及變形特征隨其粒徑的變化規(guī)律。本文以水作用下不同粒徑類巖試樣為主要研究對(duì)象,綜合運(yùn)用室內(nèi)試驗(yàn)及數(shù)值計(jì)算等方法,對(duì)不同粒徑類巖試樣在不同含水率狀態(tài)下的力學(xué)性質(zhì)及破壞形態(tài)進(jìn)行了較為系統(tǒng)的研究。通過類巖試樣吸水性試驗(yàn)、不同狀態(tài)試樣單軸壓縮試驗(yàn),掌握了不同粒徑試樣含水率隨浸水時(shí)間的關(guān)系以及類巖試樣單軸抗壓強(qiáng)度、彈性模量、峰值應(yīng)變隨含水率及粒徑的變化規(guī)律:不同粒徑試樣含水率與浸水時(shí)間變化可大致分為含水率勻速增長、含水率增速減慢、含水率趨零三個(gè)階段;類巖試樣單軸抗壓強(qiáng)度和彈性模量與含水率呈負(fù)線性關(guān)系,峰值應(yīng)變隨含水率呈正線性變化;類巖試樣單軸抗壓強(qiáng)度、彈性模量和峰值應(yīng)變與粒徑分別呈反比例、正線性和負(fù)線性關(guān)系;并分別進(jìn)行了敏感性分析。通過對(duì)水作用下不同粒徑類巖試樣聲發(fā)射試驗(yàn),從聲發(fā)射計(jì)數(shù)的角度研究了不同含水率和粒徑條件下,試樣在各加載階段的聲發(fā)射特征,分析了粒徑和水對(duì)聲發(fā)射計(jì)數(shù)的影響;最后根據(jù)試驗(yàn)所得不同狀態(tài)試樣應(yīng)力應(yīng)變曲線,利用PFC2D進(jìn)行了校核,采用校核參數(shù)模擬了試樣單軸壓縮試驗(yàn)和聲發(fā)射試驗(yàn),分析了水及粒徑對(duì)試樣內(nèi)裂隙發(fā)育和破壞形態(tài)的影響,并研究了不同狀態(tài)下,試樣的聲發(fā)射特性,發(fā)現(xiàn)含水率的上升,試樣的聲發(fā)射事件總數(shù)總體呈下降趨勢(shì);而粒徑越大的試樣單軸壓縮過程中釋放的聲發(fā)射信號(hào)反而更多。
[Abstract]:Water-rock interaction has always been one of the hotspots and difficulties in rock mechanics research. Sandstone is a common rock type in coal mining, and its mechanical properties are related to all aspects of coal mining. In addition, under the action of water-rock, all aspects of the rock mass are also affected to varying degrees. At present, the research at home and abroad mainly focuses on the drying, nature and saturation of a certain kind of rock, and only considers the influence of water on certain rock properties, but neglects the nature of rock itself. In this paper, the mechanical properties and failure morphology of rock samples with different particle sizes under the action of water are studied in order to reveal the variation of rock strength and deformation characteristics with their particle size under the action of water. In this paper, the samples with different sizes of rock under the action of water are taken as the main research object, and the indoor test and numerical calculation methods are used synthetically. The mechanical properties and failure morphology of rock samples with different particle sizes under different water content were studied systematically. Through the water absorption test of rock-like samples and uniaxial compression tests of samples in different states, the relationship between moisture content of samples with different particle size and immersion time, uniaxial compressive strength and elastic modulus of rock-like samples were obtained. The variation of peak strain with water content and particle size: the variation of water content and soaking time of different particle size samples can be roughly divided into three stages: water content increases uniformly, water content increases slowly, water content tends to zero; The uniaxial compressive strength and elastic modulus of rock-like samples showed a negative linear relationship with moisture content, and the peak strain changed positively linearly with water content, while the uniaxial compressive strength, elastic modulus and peak strain of rock-like samples were inversely proportional to the particle size. The positive linear and negative linear relationships were analyzed respectively. Based on the acoustic emission test of rock samples with different particle sizes under the action of water, the acoustic emission characteristics of different water content and particle size were studied from the point of view of acoustic emission counting, and the effects of particle size and water on acoustic emission counting were analyzed. Finally, according to the stress-strain curves of samples in different states, PFC2D was used to check the test results. The uniaxial compression test and acoustic emission test were simulated by checking parameters. The effects of water and particle size on the fracture development and fracture morphology in the samples were analyzed. The acoustic emission characteristics of the samples under different conditions were studied. It was found that the total number of AE events decreased with the increase of water content. However, the larger the particle size is, the more acoustic emission signals are released during uniaxial compression.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TD315

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