本文選題：砂卵石地層 + 刀盤刀具　； 參考：《大連交通大學(xué)》2014年碩士論文

【摘要】：隨著我國隧道及地下空間的發(fā)展,盾構(gòu)施工技術(shù)也得到了廣泛應(yīng)用。然而目前尚未形成完善的盾構(gòu)機設(shè)計理論。盾構(gòu)機在砂卵石地層掘進時,刀盤刀具受力復(fù)雜,磨損嚴(yán)重,地層容易坍塌。為了掌握盾構(gòu)機在砂卵石地層掘進時刀盤刀具受力情況,優(yōu)化刀盤設(shè)計,提高盾構(gòu)刀盤的地質(zhì)適應(yīng)性和掘進效率,本文在國家自然科學(xué)基金“盾構(gòu)刀盤與巖土動態(tài)交互作用機理及刀盤系統(tǒng)設(shè)計理論(51105048)”資助下,完成主要工作如下： 1.通過調(diào)研,研究了近幾十年來國內(nèi)外在砂卵石地層掘進的盾構(gòu)施工技術(shù)以及刀具切削土體的研究現(xiàn)狀及研究重點,分析了砂卵石地層特點和我國砂卵石地層盾構(gòu)施工實例,研究適合砂卵石地層的刀盤結(jié)構(gòu)形式、刀具和刀具配置,在此基礎(chǔ)上,根據(jù)施工經(jīng)驗總結(jié)施工時常出現(xiàn)的問題及解決辦法。 2.利用三維建模軟件Pro/E建立某一盾構(gòu)刀盤刀具的三維實體模型,用ANSYS建立有限元模型,計算出各刀具的切削力,分別對盾構(gòu)刀盤刀具在砂卵石地層不同推進工況下的受力進行靜態(tài)有限元分析,得出應(yīng)力、應(yīng)變分布,并研究提出提高刀盤刀具耐用性的措施。 3.運用動力學(xué)分析軟件ANSYS/LS-DYNA建立砂卵石地層刀具切削土體的三維有限元模型,選取適合土壤切削的土體本構(gòu)模型,對刀具切削進行動態(tài)仿真。研究切削刀具在不同切削速度、切削深度和刀間距的情況下,刀具與土體接觸過程中的力學(xué)變化規(guī)律,仿真結(jié)果得出：隨著切削深度的增加刀具接觸力增大,切削速度對刀具接觸力的影響不大,隨著刀間距的增加,刀具接觸力有增大趨勢,但增加量較小。雙刀協(xié)同切削時刀具接觸力比同掘進參數(shù)下單刀切削時的接觸力明顯降低。研究結(jié)果為砂卵石地層刀盤刀具布局設(shè)計及合理掘進參數(shù)的選擇提供參考。
[Abstract]:With the development of tunnel and underground space in China, shield construction technology has been widely used. However, no perfect shield machine design theory has been formed at present. When the shield machine is driving in the sand and pebble stratum, the cutter tool has complex force and serious wear, and the stratum collapses easily. In order to understand the force of cutter in sand and pebble stratum, optimize the design of cutter head, improve the geological adaptability and tunneling efficiency of shield cutter head. Supported by the National Natural Science Foundation of China, the mechanism of dynamic interaction between shield cutter head and rock and soil and the design theory of cutter head system (51105048), the main work is as follows: 1. Through investigation and investigation, this paper studies the technology of shield tunneling in sand and gravel strata in recent decades and the research status and emphases of cutting soil by cutting tools, and analyses the characteristics of sand and gravel strata and the examples of shield construction in sand and gravel strata in China. This paper studies the structural form of cutter head, tool and tool configuration suitable for sand and pebble stratum. On the basis of this, the problems that often appear in construction are summarized according to the construction experience and the solutions are given. 2. The 3D solid model of a shield cutter is established by using the 3D modeling software Prop / E, and the finite element model is established by ANSYS to calculate the cutting force of each tool. The static finite element analysis of the cutting tool of shield machine under different propulsion conditions of sand pebble stratum is carried out, the distribution of stress and strain is obtained, and the measures to improve the durability of cutter head tool are put forward. The dynamic analysis software ANSYS- LS-DYNA was used to establish a three-dimensional finite element model for cutting soil by cutting tools in sand and gravel strata. The constitutive model of soil was selected for soil cutting, and the dynamic simulation of cutting tool was carried out. The mechanical changes of cutting tools in the process of contact with soil are studied under the conditions of different cutting speed, cutting depth and tool spacing. The simulation results show that the contact force increases with the increase of cutting depth. The cutting speed has little effect on the tool contact force. With the increase of tool spacing, the tool contact force increases, but the increase is small. The contact force of the cutting tool is lower than that of the single cutter cutting with the same tunneling parameters. The results provide a reference for the tool layout design and the selection of reasonable tunneling parameters.
【學(xué)位授予單位】：大連交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.39

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