本文選題：樁錨協(xié)同作用 + 群錨效應(yīng)��； 參考：《山東大學(xué)》2017年碩士論文

【摘要】：基于濟(jì)南市基坑樁錨支護(hù)結(jié)構(gòu)工程案例,借助PLAXIS-3D有限元軟件,采用土體硬化本構(gòu)模型,對(duì)樁錨協(xié)同作用及支護(hù)樁遮攔效應(yīng)展開(kāi)研究,在此基礎(chǔ)上構(gòu)建基于樁錨支護(hù)的深基坑永久支護(hù)結(jié)構(gòu)體系,論文取得如下成果:1、樁錨協(xié)同作用(1)樁錨支護(hù)結(jié)構(gòu)中,群錨效應(yīng)發(fā)生的錨索水平臨界間距隨預(yù)應(yīng)力的增加而減小,針對(duì)濟(jì)南市工程地質(zhì),明確不同預(yù)應(yīng)力條件下的臨界間距;(2)錨索預(yù)應(yīng)力自上而下依次增大、縱向間距自上而下依次減小的布置方式更有利于支護(hù)結(jié)構(gòu)位移控制;(3)支護(hù)結(jié)構(gòu)位移控制要以錨索控制位主、支護(hù)樁控制為輔,設(shè)計(jì)過(guò)程采用"強(qiáng)錨弱樁"的搭配原則。2、支護(hù)樁遮攔作用支護(hù)樁的存在能顯著減少地下室外墻土壓力,通過(guò)對(duì)多個(gè)工程模擬結(jié)果進(jìn)行擬合,得到支護(hù)樁存在條件下的地下室外墻土壓力分布曲線,并在靜止土壓力計(jì)算公式的基礎(chǔ)上引入折減系數(shù)k,建立的支護(hù)樁存在條件下的土壓力折減公式,為類(lèi)似工程提供參照。3、基坑永久支護(hù)結(jié)構(gòu)體系通過(guò)設(shè)置連接構(gòu)件,構(gòu)建支護(hù)樁與地下主體結(jié)構(gòu)相結(jié)合的永久支護(hù)結(jié)構(gòu)體系。模擬結(jié)果表明:永久支護(hù)結(jié)構(gòu)中,坑外土壓力主要由支護(hù)樁和地下水平結(jié)構(gòu)共同承擔(dān),地下室外墻只承擔(dān)肥槽回填土體土壓力,且遠(yuǎn)小于靜止土壓力,無(wú)水條件下,地下室外墻設(shè)計(jì)只需滿(mǎn)足構(gòu)造要求。
[Abstract]:Based on the case of pile-anchor supporting structure engineering in Jinan City, by means of PLAXIS-3D finite element software and soil hardening constitutive model, the synergistic effect of pile and anchor and the shielding effect of supporting pile are studied. On this basis, the permanent support structure system of deep foundation pit based on pile and anchor support is constructed. In this paper, the following results are obtained: 1) in the pile-anchor support structure, the critical horizontal spacing of anchor cable decreases with the increase of prestress. In view of the engineering geology of Jinan City, it is clear that the critical spacing of anchor cables increases from top to bottom under different prestressing conditions. The arrangement of decreasing the longitudinal distance from top to bottom is more favorable to the displacement control of the supporting structure. The displacement control of the supporting structure should be mainly controlled by the anchor cable and supplemented by the control of the supporting pile. In the design process, the collocation principle of "strong anchor and weak pile" is adopted. The existence of supporting pile can significantly reduce the earth pressure on the exterior wall of basement. The earth pressure distribution curve of the exterior wall of the basement under the condition of the existence of the supporting pile is obtained, and the formula of earth pressure reduction under the condition of the existence of the supporting pile is established by introducing the reduction coefficient k on the basis of the calculation formula of the static earth pressure. In order to provide reference for similar engineering, the permanent supporting structure system of foundation pit is constructed by setting up connecting members and combining the supporting pile with the underground main body structure. The simulation results show that in the permanent support structure, the earth pressure outside the pit is mainly borne by the supporting pile and the underground horizontal structure, and the external wall of the basement only bears the earth pressure of the fertilizer groove backfill, and it is much smaller than the static earth pressure, and under the condition of no water, The exterior wall design of basement only needs to meet the construction requirements.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU753

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