本文選題：盾構(gòu)　切入點(diǎn)：直接切削　出處：《北京交通大學(xué)》2014年博士論文　論文類型：學(xué)位論文

【摘要】：摘要：盾構(gòu)掘進(jìn)遭遇障礙物樁基時(shí),直接切樁相比于傳統(tǒng)方法,影響周邊環(huán)境小、成本低、工期短,社會(huì)及經(jīng)濟(jì)效益顯著,但目前切樁理論研究與實(shí)施技術(shù)在國(guó)際范圍內(nèi)尚遠(yuǎn)未成熟,尤其是對(duì)于切削大直徑樁基。本文依托蘇州地鐵盾構(gòu)切削14根中1000～1200mm橋梁樁基工程,綜合采用調(diào)研、理論分析、有限元仿真、現(xiàn)場(chǎng)試驗(yàn)和工程實(shí)測(cè)等研究手段,對(duì)盾構(gòu)直接掘削大直徑鋼筋混凝土群樁的相關(guān)機(jī)理、理論與技術(shù)進(jìn)行研究。主要研究?jī)?nèi)容和成果如下： (1)綜合考慮材料非線性、幾何非線性以及接觸非線性,以國(guó)際大型非線性顯式動(dòng)力軟件為分析平臺(tái),對(duì)刀刃切削鋼筋、混凝土的切削過(guò)程、相互作用及細(xì)觀切削機(jī)理進(jìn)行了研究。 (2)切削鋼筋混凝土樁基應(yīng)選用負(fù)前角、雙面刃的刀具；通過(guò)有限元仿真獲得了刀刃前角、刃角、刃寬等對(duì)切筋、切砼的影響規(guī)律,并以適應(yīng)連續(xù)切削大直徑樁基為目標(biāo),研發(fā)出了新型切樁專用刀具；通過(guò)建立三維切削鋼筋熱力耦合模型和三維切削混凝土全過(guò)程模型,揭示了新型刀具的動(dòng)態(tài)切削過(guò)程及切削性能；結(jié)合仿真計(jì)算結(jié)果并對(duì)比各種磨損類型的發(fā)生條件,指出刀具合金切削鋼筋、混凝土對(duì)應(yīng)的磨損機(jī)理為硬質(zhì)點(diǎn)磨粒磨損。 (3)從理論上對(duì)切樁刀盤刀具配置進(jìn)行了深入研究：刀具布置形式可采用同心圓法,相鄰刀具宜以等相位角差值進(jìn)行定位,切削軌跡的間距確定應(yīng)以能實(shí)現(xiàn)全覆蓋面切削混凝土為原則；考慮掘削樁基對(duì)刀盤刀具的多功能需求,提出了包括有正面大貝殼刀、邊緣大貝殼刀、中心小貝殼刀、仿形貝殼刀以及羊角儲(chǔ)備刀在內(nèi)的刀盤群刀綜合配置方案。 (4)通過(guò)建立刀盤切樁數(shù)學(xué)模型,編制刀盤受力計(jì)算程序,獲得了推力扭矩與刀盤不平衡力的變化特征,以及樁基尺寸大小、偏移距離對(duì)刀盤受力的影響規(guī)律,并給出了相應(yīng)的主動(dòng)掘削參數(shù)設(shè)置建議；采用國(guó)際大型機(jī)械設(shè)計(jì)軟件建立了切樁刀盤刀具模型,并針對(duì)最不利的切削工況,對(duì)刀盤剛度進(jìn)行檢算并提出了加固措施。 (5)開(kāi)展了國(guó)內(nèi)外首次的盾構(gòu)直接切削鋼筋混凝土樁基現(xiàn)場(chǎng)試驗(yàn),分析了切樁效果、刀具損傷規(guī)律以及掘削參數(shù)特征等,對(duì)刀具配置和掘削參數(shù)初步方案的合理性進(jìn)行了驗(yàn)證,并根據(jù)試驗(yàn)結(jié)果提出了超前貝殼刀的優(yōu)化配置方案及分次切筋的切削理念,其切削效果得到了群刀切削仿真實(shí)驗(yàn)的證實(shí),并最終在工程實(shí)踐中得到成功應(yīng)用。 (6)以蘇州地鐵盾構(gòu)切削14根大直徑橋梁群樁工程為依托,探討了切樁條件下的上部結(jié)構(gòu)與管片襯砌的安全性能；從刀盤刀具、螺旋輸送機(jī)、小流量推進(jìn)泵、外包管等多方面研究提出了盾構(gòu)綜合改造加強(qiáng)方案；形成了以“慢推速、中轉(zhuǎn)速、保土壓、注惰漿、控姿態(tài)”為核心的盾構(gòu)掘削大直徑樁基施工控制技術(shù)。
[Abstract]:Absrtact: when shield tunneling encounters obstacle pile foundation, compared with traditional method, direct cutting pile has less influence on surrounding environment, lower cost, shorter time limit, and remarkable social and economic benefits. However, at present, the theoretical research and implementation technology of cutting pile is far from mature in international scope, especially for cutting large diameter pile foundation. In this paper, based on the Suzhou Metro Shield Machining 14 piles of 1000 ~ 1200mm bridge foundation engineering, the comprehensive use of research, theoretical analysis, By means of finite element simulation, field test and engineering measurement, this paper studies the mechanism, theory and technology of direct excavation of large diameter reinforced concrete pile groups by shield tunneling. The main contents and results are as follows:. 1) considering the material nonlinearity, geometric nonlinearity and contact nonlinearity, the cutting process of steel bar and concrete on the cutting edge of steel bar and concrete is analyzed on the platform of international large-scale nonlinear explicit dynamic software. Interaction and micro-cutting mechanism were studied. (2) cutting reinforced concrete pile foundation should use the tool with negative front angle and double edge, and through finite element simulation, the influence law of the cutting edge angle, edge angle, edge width etc. on the cutting of reinforcement and concrete is obtained, and the aim is to adapt to the continuous cutting of large diameter pile foundation. A new type of special cutting tool for pile cutting is developed and the dynamic cutting process and cutting performance of the new cutting tool are revealed by establishing a three-dimensional coupled model of cutting steel bar and the whole process model of three-dimensional cutting concrete. In combination with the simulation results and the comparison of the occurrence conditions of various wear types, it is pointed out that the wear mechanism of tool alloy cutting steel bar and concrete is hard spot abrasive wear. 3) the tool configuration of cutting pile cutter head is studied in theory: the tool arrangement can adopt concentric circle method, and the adjacent tool should be located by equal phase angle difference. The spacing of cutting track should be determined according to the principle that the cutting concrete can be fully covered. Considering the multi-function requirement of cutting tool for cutting pile foundation, it is proposed that there are large shell knife with frontal surface, big shell knife with edge, small shell knife in center. The integrated configuration scheme of knife head group knife including copying shell knife and goat horn reserve knife. 4) by establishing the mathematical model of cutting pile of cutter head and compiling the calculation program of force on cutter head, the variation characteristics of thrust torque and unbalanced force of cutter head, the influence of pile foundation size and offset distance on the force of cutter head are obtained. The paper also gives the corresponding suggestions for setting the cutting parameters of active driving, establishes the cutting tool model of the cutting pile cutter by using the international large-scale mechanical design software, and checks the stiffness of the cutter head and puts forward the reinforcement measures in view of the most unfavorable cutting conditions. In this paper, the first direct cutting test of reinforced concrete pile foundation is carried out at home and abroad, and the effect of cutting pile, the law of tool damage and the characteristics of cutting parameters are analyzed. The rationality of tool configuration and initial scheme of cutting parameters is verified. According to the experimental results, the optimal configuration scheme of the advanced shell cutter and the cutting idea of the graded cutting rib are put forward. The cutting effect is verified by the simulation experiment of the group cutter cutting, and finally it is successfully applied in the engineering practice. The safety performance of the upper structure and segment lining under the condition of pile cutting is discussed based on 14 large diameter bridge group piles cutting by shield tunneling in Suzhou Metro, and the safety performance of the upper structure and segment lining under the condition of cutting pile is discussed, which includes cutter cutters, screw conveyors, small flow propulsive pumps, etc. In this paper, the comprehensive reconstruction scheme of shield tunneling is put forward, and the construction control technology of shield tunneling large diameter pile foundation with the core of "slow pushing speed, medium speed, retaining earth pressure, inert slurry injection and attitude control" is formed.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.43;U455.39

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