發(fā)布時間：2018-04-10 14:31

  本文選題：EPS顆粒輕質(zhì)混合土 + 擋土墻　； 參考：《南京工業(yè)大學(xué)》2015年碩士論文

【摘要】：在大規(guī)模的基礎(chǔ)建設(shè)過程中往往會伴隨著大量的地基土體的填挖,特別是在山區(qū)修建道路橋梁,需要大規(guī)模修筑擋土結(jié)構(gòu)。近年來,我國地震災(zāi)害愈發(fā)頻繁,對于擋墻穩(wěn)定性是一個巨大的考驗,已有的擋墻抗震研究還不夠深入,因此擋墻地震荷載下穩(wěn)定性研究顯得十分緊迫。課題基于EPS顆粒輕質(zhì)混合土(EPS composite soil)在工程領(lǐng)域可行性的研究,開展了EPS顆粒輕質(zhì)混合土的基本物理力學(xué)性質(zhì)試驗,并結(jié)合擋墻失穩(wěn)研究現(xiàn)狀,設(shè)計完成了一組幾何相似常數(shù)為1/4的回填EPS顆粒輕質(zhì)混合土擋墻的抗震性能研究的大型振動臺試驗。文章主要工作及結(jié)論如下：(1)開展了EPS顆粒輕質(zhì)混合土的基本物理力學(xué)性質(zhì)試驗,包括密度試驗、壓縮試驗、直剪試驗。試驗結(jié)果表明,EPS顆粒輕質(zhì)混合土的密度主要受EPS顆粒含量影響,且隨著EPS顆粒含量增大而減��；抗剪強度隨水泥含量增大而增大,并在EPS顆粒含量取3%左右取得一個相對較大值。(2)設(shè)計了一組EPS輕質(zhì)土擋墻的大型振動臺試驗,包括根據(jù)原型和試驗?zāi)康脑O(shè)計模型結(jié)構(gòu)和模型地基；選擇對應(yīng)試驗裝置且合理布置試驗傳感器；試驗過程中對各部分工作協(xié)調(diào)安排。(3)分析了EPS輕質(zhì)土擋墻的大型振動臺試驗結(jié)果,研究了EPS輕質(zhì)土作為擋墻背后填土,在地震荷載作用下的動力特性。結(jié)果表明,相對普通回填土,EPS輕質(zhì)土對于地震動的耗能效果明顯,有效地降低了地震動的加速度峰值；作用于擋墻背后的主動土壓力分布規(guī)律差異明顯；相同位置,回填EPS輕質(zhì)土的擋墻應(yīng)變更小,加速度峰值較小,墻頂端位移也更小�；靥頔PS顆粒輕質(zhì)混合土能夠減少地震荷載對擋墻穩(wěn)定性的影響。
[Abstract]:In the process of large-scale infrastructure construction, it is often accompanied by a large number of subgrade soil fill and excavation, especially in the mountains to build roads and bridges, it is necessary to build a large scale retaining structure.In recent years, earthquake disasters become more and more frequent in China, which is a great test for the stability of retaining wall. The existing seismic research of retaining wall is not enough, so the research on the stability of retaining wall under earthquake load is very urgent.Based on the feasibility study of EPS granular lightweight mixed soil (EPS composite soil) in the field of engineering, the basic physical and mechanical properties of EPS granular lightweight mixed soil are tested, and the research status of retaining wall instability is combined.A set of large-scale shaking table tests with a geometric similarity constant of 1 / 4 for the seismic performance of backfilled EPS particle lightweight mixed soil retaining wall were designed and completed.The main work and conclusions are as follows: (1) the basic physical and mechanical properties of EPS granular lightweight mixed soil are tested, including density test, compression test and direct shear test.The results show that the density of light mixed soil is mainly affected by the content of EPS particles, and decreases with the increase of EPS particle content, and the shear strength increases with the increase of cement content.A relatively large value of about 3% of EPS particles was obtained.) A group of shaking table tests of EPS light soil retaining wall were designed, including the design of model structure and model foundation according to prototype and test purpose.Selecting the corresponding test device and arranging the test sensor reasonably, the test results of the large scale shaking table of EPS lightweight soil retaining wall are analyzed, and the EPS lightweight soil as the backfill of the retaining wall is studied.Dynamic behavior under earthquake load.The results show that compared with ordinary backfill soil, EPS light soil has obvious energy dissipation effect on ground motion, effectively reduces the acceleration peak value of ground motion, and the distribution of active earth pressure acting on the back of retaining wall is obviously different.The strain of retaining wall is smaller, the peak of acceleration is smaller, and the displacement of the top of the wall is smaller than that of the backfilled EPS lightweight soil.Backfilling EPS granular lightweight mixed soil can reduce the influence of seismic load on the stability of retaining wall.
【學(xué)位授予單位】：南京工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU476.4

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