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  本文關(guān)鍵詞： 飽和液化土 振動臺試驗 碎石樁 超靜孔隙水壓力　出處：《浙江海洋大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：飽和砂土在地震的振動作用下極易發(fā)生液化,從而產(chǎn)生土層噴砂冒水、地基不均勻沉降及地面開裂等現(xiàn)象,這些都將可能帶來大量人員傷害和財產(chǎn)損失。同時,由于土體構(gòu)成的復(fù)雜性,且具有很強的區(qū)域性特征,不同區(qū)域的砂土在地震作用下液化機理也將可能呈現(xiàn)不同的特征。因此,圍繞區(qū)域砂土開展液化機理分析以及考慮加固措施將對區(qū)域安全具有重要的價值和意義。本文針對舟山某地區(qū)飽和砂土開展了其液化機理和加固的相關(guān)試驗研究。在振動條件下,本文開展了未加固砂土模型、樁距分別為3倍、4倍以及5倍樁徑的碎石樁加固振動模型試驗。觀察比較了各個模型的宏觀現(xiàn)象,詳細(xì)采集了各個模型的超靜孔隙水壓力和加速度等數(shù)據(jù),并結(jié)合相關(guān)軟件分析、歸納總結(jié)了其中的變化規(guī)律和機理。研究表明:(1)從宏觀現(xiàn)象這方面來看,未加固砂土與加固砂土的液化現(xiàn)象具有明顯的不同。對于未加固砂土振動模型,孔隙水一開始從土體表面裂縫滲出,并伴有土體隆起現(xiàn)象;而對于碎石樁加固的砂土振動模型,孔隙水一開始是從碎石樁內(nèi)部涌出,土體表面沒有明顯隆起�？梢�,碎石樁在其中起到了有效的排水減壓消散作用。(2)不論是未加固還是不同樁距加固的砂土振動模型,其超靜孔隙水壓力都是隨土體深度的增加而不斷增大。對于同樣深度的土層,不同模型的超靜孔隙水壓力峰值是相近的。(3)相比其他未加固和加固模型,樁距為3倍直徑的加固振動模型具有最優(yōu)的抗液化效果,即開始液化的時間有明顯的延遲。本文的研究工作,將為舟山該區(qū)域的飽和砂土地基抗液化處理提供有用的參考依據(jù),具有一定的工程應(yīng)用價值。
[Abstract]:Saturated sand is prone to liquefaction under earthquake vibration, resulting in sand blasting, uneven settlement of the foundation and ground cracking, which may bring a large number of human damage and property losses at the same time. Because of the complexity of soil composition and strong regional characteristics, the liquefaction mechanism of sand in different regions may also show different characteristics. Analysis of liquefaction mechanism around regional sand and consideration of reinforcement measures will be of great value and significance to regional safety. In this paper, the liquefaction mechanism and reinforcement of saturated sand in a certain area of Zhoushan are studied. Under vibrating conditions. In this paper, the vibration model tests of gravel piles with 3 times and 5 times diameter of piles are carried out, and the macroscopic phenomena of each model are observed and compared. The data of excess pore water pressure and acceleration of each model are collected in detail, and combined with the analysis of relevant software, the variation law and mechanism are summarized and summarized. The research shows that: 1) from this aspect of macroscopic phenomenon. The liquefaction phenomenon of unreinforced sand is obviously different from that of reinforced sand. For the vibration model of unreinforced sand, pore water seeps out from the surface of soil and is accompanied by the uplift of soil. However, for the vibration model of sand and soil strengthened by gravel pile, pore water is gushing out from the inside of gravel pile at the beginning, and the soil surface is not obviously raised. Gravel piles play an effective role in drainage decompression dissipation. 2) the sand vibration model is not reinforced or reinforced with different pile-spacing. The excess pore water pressure increases with the increase of soil depth. For the same depth soil layer, the peak value of excess pore water pressure of different models is similar to that of other models without reinforcement and reinforcement. The reinforcement vibration model with 3 times diameter of pile spacing has the best anti-liquefaction effect, that is, the time of starting liquefaction is obviously delayed. It will provide a useful reference for anti-liquefaction treatment of saturated sand foundation in Zhoushan area, and has certain engineering application value.
【學(xué)位授予單位】：浙江海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU441;TU472

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