本文關鍵詞： 拆除爆破 數(shù)值模擬 ANSYS/LS-DYNA　出處：《內蒙古科技大學》2014年碩士論文　論文類型：學位論文

【摘要】：從黑火藥誕生之日起，爆破技術就對人們的生產和生活產生了重要的影響。無論在戰(zhàn)爭中還是在建設中都廣泛的存在著爆破的身影。特別是進入現(xiàn)代社會以后，爆破技術以其獨特的作用給人們帶來了更多的方便。開山劈路時，利用爆破技術可以節(jié)約很多人力，舊城區(qū)改建時，利用爆破技術顯然更加經濟、安全和高效。得益于經濟技術的發(fā)展，爆破器材和爆破技術也在不斷發(fā)展，爆破技術在社會建設領域的應用也越來越廣泛。 爆破技術在社會建設中的應用的方式主要是在破壞中求建設，由于爆破自身的危險性和有關理論研究的相對滯后，爆破安全事故還時有發(fā)生，給人們的生命財產的安全造成了一定的威脅，這就有必要更加深入的研究爆破作用機理和對其可能造成的危害進行防治。本論文以高效、安全爆破為目的，以數(shù)值模擬為手段，對爆破作業(yè)的安全性進行事前分析，從而避免爆破安全事故的發(fā)生。 目前在數(shù)值模擬領域應用的比較廣泛的軟件是ANSYS/LS-DYNA，它自身包含了幾乎所有人們所認知的材料，輸入相關的參數(shù)，幾乎可以建造任何模型。在ANSYS/LS-DYNA中，LINK160主要用于建立一維模型，SHELL163是適用于建立平面的模型單元，SOLID164是適用于建立立體模型的單元。正是由于其豐富的單元庫，使我們對所建模型進行靜力學和動力學分析成為了可能。 本論文用SOLIDl64單元和MAT_PLASTIC_KINEMATIC材料構建鋼筋混凝土橋梁模型，，用SHELL單元和RIGID材料構建地面模型，對打眼階段對橋梁結構的穩(wěn)定性進行分析和爆破過后橋梁的失穩(wěn)坍塌過程進行動態(tài)模擬，分析爆破方案可能存在的安全隱患。 由于目前的ANSYS/LS-DYNA軟件中還沒有定義材料失效的相關操作，所以在定義爆破缺口時需要對在前處理過程中生成的K文件進行修改，在K文件中通過添加MAT_ADD_EROSION關鍵字來定義爆破缺口，并且對時間參數(shù)進行相應設置來控制爆破缺口的形成順序。本論文通過對模擬效果和實際的爆破效果進行對比分析，發(fā)現(xiàn)數(shù)值模擬的效果還是挺好的。
[Abstract]:Since the birth of black powder, blasting technology has had an important impact on people's production and life. Blasting is widespread in both war and construction, especially after entering the modern society. Blasting technology has brought more convenience to people because of its unique role. Blasting technology can save a lot of manpower when opening mountains and splitting roads, and it is obviously more economical to use blasting technology in the old urban reconstruction. Thanks to the development of economy and technology, blasting materials and blasting technology are developing continuously, and blasting technology is more and more widely used in the field of social construction. The application of blasting technology in social construction is mainly in the construction of destruction. Because of the danger of blasting itself and the relative lag of relevant theoretical research, blasting safety accidents occur from time to time. It is necessary to study the mechanism of blasting and prevent its possible harm. This paper aims at high efficiency and safety blasting and takes numerical simulation as a means. The safety of blasting operation is analyzed in advance to avoid the occurrence of blasting safety accidents. The more widely used software in the field of numerical simulation is ANSYS- LS-DYNA, which itself contains almost all the materials that people know and input the relevant parameters. Almost any model can be built in ANSYS/LS-DYNA. In ANSYS/LS-DYNA, it is mainly used to build one-dimensional model SHELL163, which is a model unit suitable for building a plane, and SOLID164 is a unit suitable for building stereoscopic models. It is precisely because of its rich cell library, This makes it possible for us to analyze the model statically and dynamically. In this paper, SOLIDl64 element and MAT_PLASTIC_KINEMATIC material are used to construct reinforced concrete bridge model, and SHELL element and RIGID material are used to construct ground model. The stability of bridge structure and the collapse process of bridge after blasting are simulated dynamically, and the potential safety hidden danger of blasting scheme is analyzed. Because there is no relevant operation of material failure in the current ANSYS/LS-DYNA software, it is necessary to modify the K file generated in the pre-processing process when defining the blasting gap, and define the blasting gap by adding the MAT_ADD_EROSION keyword to the K file. And the time parameters are set to control the formation order of blasting notches. Through the comparison and analysis of the simulation effect and the actual blasting effect, it is found that the numerical simulation results are still very good.
【學位授予單位】：內蒙古科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.6

【參考文獻】

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本文編號：1545076