本文關(guān)鍵詞： 含填充裂隙 單軸壓縮 裂隙擴(kuò)展 數(shù)字圖像相關(guān)法 起裂應(yīng)力　出處：《湖北工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：由于地殼在不斷運(yùn)動和發(fā)展,巖體大多時(shí)候呈現(xiàn)出明顯的不連續(xù)性,存在大量的節(jié)理、裂隙等結(jié)構(gòu)面。結(jié)構(gòu)面的特征在很大程度上決定了巖體在受力作用下的變形機(jī)制和破壞方式。為了研究含填充裂隙巖石的破壞過程和破裂機(jī)理,論文主要進(jìn)行了如下工作:(1)對含有不同裂隙傾角、不同填充物的大理巖進(jìn)行單軸壓縮破壞過程試驗(yàn),分析不同傾角、不同填充物條件下裂隙硬巖破裂過程的變形場演化特征、應(yīng)力-應(yīng)變曲線、強(qiáng)度特征、預(yù)制裂隙起裂點(diǎn)、起裂角和擴(kuò)展形態(tài)等變化趨勢,研究裂紋傾角和填充物對巖體破壞過程和破壞模式的影響,并在此基礎(chǔ)上修正了含填充裂隙硬巖的本構(gòu)模型。(2)采用彈塑性細(xì)胞自動機(jī)模擬系統(tǒng)EPCA2D,對不同裂紋傾角、不同填充和不同裂紋寬度等條件下,裂隙硬巖的單軸壓縮試驗(yàn)進(jìn)行數(shù)值模擬計(jì)算,對比試驗(yàn)結(jié)果,分析不同條件對裂隙硬巖破裂過程、強(qiáng)度、裂紋擴(kuò)展模式等的影響機(jī)制。結(jié)果表明:(1)對于含有填充物的裂隙硬巖,隨著裂隙傾角的增大,起裂點(diǎn)距離裂隙尖端越來越近,起裂角越來越小,硬巖的整體強(qiáng)度會有先減小后增大的趨勢;(2)當(dāng)裂隙中含有填充物時(shí),硬巖的強(qiáng)度較無填充硬巖有明顯的提高,且提高幅度會隨著填充物彈性模量的增大而增大;(3)當(dāng)裂隙中沒有填充物時(shí),硬巖強(qiáng)度會隨著裂隙寬度的增大而減小,但當(dāng)裂隙中含有不同填充時(shí),硬巖強(qiáng)度會因裂隙寬度的變化而呈現(xiàn)不同的變化規(guī)律。(4)無論裂隙填充與否,裂隙硬巖在單軸壓縮條件下的破壞大都是張拉和剪切共同作用的結(jié)果,但破壞形態(tài)會有所不同。當(dāng)裂隙中含有填充時(shí),剪切破壞更為明顯;而當(dāng)裂隙中沒有填充時(shí),張拉破壞更為顯著。通過上述工作,討論了不同裂隙特征、不同充填材料對硬巖破壞過程的影響,總結(jié)了不同條件下裂紋的擴(kuò)展模式,對實(shí)際工程有一定的指導(dǎo)意義。
[Abstract]:Because of the continuous movement and development of the earth's crust, the rock mass presents obvious discontinuity in most of the time, and there are a large number of joints. In order to study the failure process and fracture mechanism of rock filled with fissures, the deformation mechanism and failure mode of rock mass under stress are determined to a great extent by the characteristics of structural planes such as fissures. The main work of this paper is as follows: (1) the uniaxial compression failure tests of marble with different fracture inclination and different fillers are carried out, and the evolution characteristics of fracture field of fractured hard rock under different dip angles and different filling conditions are analyzed. The stress-strain curves, strength characteristics, prefabricated crack initiation points, crack initiation angles and propagation patterns are studied. The effects of crack inclination and fillers on the failure process and failure mode of rock mass are studied. On the basis of this, the constitutive model of hard rock filled with fissures is modified. (2) Elastoplastic cellular automata simulation system EPCA2D is used for different crack inclination, different filling and different crack width, etc. The uniaxial compression test of fractured hard rock is numerically simulated and compared with the experimental results. The influence mechanism of different conditions on fracture process, strength and crack propagation mode of fractured hard rock is analyzed. The results show that: 1) for fractured hard rock containing filler, With the increase of crack inclination, the initiation point is closer to the crack tip, and the initial crack angle is smaller and smaller. The overall strength of hard rock will decrease first and then increase. The strength of hard rock is obviously higher than that of unfilled hard rock, and the increase range will increase with the increase of elastic modulus of filler. (3) when there is no filler in the crack, the strength of hard rock will decrease with the increase of crack width. But when the fracture contains different filling, the strength of hard rock will show different change law because of the change of crack width. (4) regardless of whether the crack is filled or not, the failure of fractured hard rock under uniaxial compression is mostly the result of the combined action of tension and shear. But the failure pattern will be different. When the fracture contains filling, the shear failure is more obvious, but when the fracture is not filled, the tensile failure is more obvious. Through the above work, the different fracture characteristics are discussed. The influence of different filling materials on the failure process of hard rock is summarized, and the crack propagation mode under different conditions is summarized, which has certain guiding significance for practical engineering.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU45

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