發(fā)布時(shí)間：2018-05-24 12:29

  本文選題：沖擊破巖 + 節(jié)理巖體　； 參考：《大連理工大學(xué)》2013年碩士論文

【摘要】：近年來(lái),隨著社會(huì)發(fā)展的需求和科學(xué)技術(shù)水平的不斷提高,地下活動(dòng)空間及各類(lèi)資源的開(kāi)發(fā)和利用己然成為人類(lèi)重點(diǎn)關(guān)注的領(lǐng)域之一。隨著各類(lèi)挖掘機(jī)廣泛應(yīng)用于礦山開(kāi)采、隧道開(kāi)挖、油氣井鉆進(jìn)等實(shí)際工程中,對(duì)巖石破碎理論和技術(shù)提出了新的挑戰(zhàn)。沖擊破巖作為一種主流的破巖手段,具有破碎巖塊較大,作業(yè)效率高等優(yōu)點(diǎn),并且在大量的理論研究和工程實(shí)踐的相互促進(jìn)下,沖擊破巖技術(shù)被廣泛的應(yīng)用于各行業(yè)之中。 本文運(yùn)用RFPA2D動(dòng)態(tài)軟件,基于細(xì)觀(guān)損傷力學(xué)和動(dòng)力有限元方法,從高效求解動(dòng)力有限元方程著手,分析了不同現(xiàn)實(shí)條件中巖體在刀頭沖擊作用下?lián)p傷破碎的全過(guò)程。具體研究可分為以下幾個(gè)方面： (1)從求解動(dòng)力有限元大型稀疏對(duì)稱(chēng)矩陣著手,探討了幾種不同大型稀疏對(duì)稱(chēng)矩陣方程組的求解方法在求解耗時(shí)和系統(tǒng)內(nèi)存消耗方面的差異,針對(duì)普通SSOR-PCG法由于需要組裝總體剛度矩陣而導(dǎo)致消耗系統(tǒng)內(nèi)存量較大這一問(wèn)題,改善了傳統(tǒng)的KV存儲(chǔ)方式,并通過(guò)OpenMP共享內(nèi)存編程模型技術(shù),實(shí)現(xiàn)單機(jī)多核多線(xiàn)程的動(dòng)力有限元并行計(jì)算,進(jìn)一步提高了求解效率。 (2)研究了不同間距、不同傾角的節(jié)理分布巖體在刀具沖擊荷載作用下的破壞力學(xué)行為,探討了節(jié)理面對(duì)應(yīng)力波的削弱作用,數(shù)值分析了不同節(jié)理的分布對(duì)巖體裂紋生成、貫通和延伸的影響。 (3)深入探討了刀具沖擊荷載和靜荷載聯(lián)合破巖過(guò)程。通過(guò)對(duì)比分析巖體在刀具單一動(dòng)載、動(dòng)靜聯(lián)合荷載和靜態(tài)圍壓條件下動(dòng)靜聯(lián)合荷載三種情況下巖體破碎的全過(guò)程,以揭示動(dòng)靜聯(lián)合荷載下,靜壓與動(dòng)載對(duì)巖體破碎形式的影響。
[Abstract]:In recent years, with the development of society and the improvement of the level of science and technology, the development and utilization of underground space and all kinds of resources have become one of the most important fields of human attention. With the wide application of various excavators in mining, tunnel excavation, oil and gas well drilling and other practical projects, new challenges to rock breaking theory and technology have been put forward. As a mainstream method of rock breaking, impact rock breaking has the advantages of large broken rock mass and high working efficiency. Under the mutual promotion of a large number of theoretical research and engineering practice, impact rock breaking technology has been widely used in various industries. In this paper, based on the mesoscopic damage mechanics and dynamic finite element method, RFPA2D dynamic software is used to solve the dynamic finite element equations efficiently. The whole process of rock damage and breakage under the impact of the blade head in different practical conditions is analyzed in this paper. Specific studies can be divided into the following areas: 1) starting from solving large sparse symmetric matrix of dynamic finite element, this paper discusses the differences in solving time consuming and system memory consumption of several methods of solving different large sparse symmetric matrix equations. In order to solve the problem that the general SSOR-PCG method needs to assemble the total stiffness matrix, which leads to the consumption of large amount of system memory, the traditional KV storage mode is improved, and the programming model technology of OpenMP shared memory is used. Dynamic finite element parallel computation of single machine with multi-core and multi-thread is realized, and the efficiency of solving is improved. (2) the destructive behavior of jointed rock mass with different spacing and inclination under the impact loading of cutting tools is studied. The weakening of joints to stress waves is discussed. The distribution of different joints on the formation of rock mass cracks is numerically analyzed. The effect of penetration and extension. The rock breaking process combined with tool impact load and static load is discussed in detail. In order to reveal the influence of static and dynamic loads on rock mass breakage, the whole process of rock mass breakage under single dynamic load, combined dynamic and static load and static confining pressure is compared and analyzed in order to reveal the influence of static pressure and dynamic load on rock mass breakage under combined dynamic and static loads.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TU45

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