發(fā)布時(shí)間：2018-01-11 11:24

  本文關(guān)鍵詞：加筋土豎向變形及筋土相互作用試驗(yàn)研究　出處：《湖南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 加筋土 筋材變形 豎向變形 壓實(shí)度 無側(cè)向約束

【摘要】：隨著加筋土技術(shù)在鐵路工程、公路工程建設(shè)中的廣泛應(yīng)用,對(duì)加筋土技術(shù)的深入研究顯得更加迫切,尤其是加筋材料在黏性填料中的應(yīng)用導(dǎo)致了加筋材料與填料之間相互作用的復(fù)雜性。在加筋土工程中,加筋材料對(duì)土體所提供的約束力強(qiáng)弱決定了填料的加筋效果。影響這一效果的因素很多,本文針對(duì)壓實(shí)度、加筋材料類型、加筋量等因素采用試驗(yàn)手段研究了筋土的相互作用。采用無側(cè)限圓柱體加筋土試樣測(cè)試了加筋土在豎向荷載作用下,其內(nèi)部土工格柵的變形發(fā)展規(guī)律和分布情況,通過設(shè)置不同壓實(shí)度的試樣以及素土試樣,進(jìn)行分析比較;采用兩種類型土工格柵測(cè)試了無側(cè)限圓柱體加筋土試樣在長(zhǎng)期荷載作用下的豎向變形,研究不同壓實(shí)度對(duì)其豎向變形的影響程度。通過研究獲得了如下成果:(1)在土體中布置加筋材料能夠提高土體抵抗變形的能力,加筋材料的拉伸模量、筋土間的有效接觸面積以及土體壓實(shí)度對(duì)加筋效果有重要影響,加筋材料對(duì)土體實(shí)際提供的摩阻力大小決定著加筋效果的發(fā)揮程度。(2)加筋材料在填料內(nèi)分層鋪設(shè),其約束作用是通過筋土之間的相互作用而產(chǎn)生的。對(duì)于黏性填料,加筋土在受荷初期不能立即發(fā)揮其加強(qiáng)效應(yīng),只有土體的變形達(dá)到一定程度之后,其承載能力才會(huì)比素土有明顯提高。(3)土工格柵應(yīng)變的大小由格柵周圍的土體緊密程度以及該部分土體的運(yùn)動(dòng)趨勢(shì)決定。試樣承受的軸向壓力,會(huì)增加土體的緊密程度;順著土體擠壓擴(kuò)散的方向,格柵的拉伸應(yīng)變是最大的。(4)壓實(shí)度是影響加筋黏土豎向變形的重要因素。提高壓實(shí)度,可以有效增強(qiáng)加筋土抵抗變形的能力,在同樣的荷載下能減小土體的總變形量,使土體變形更快地進(jìn)入穩(wěn)定狀態(tài)。(5)素土和加筋土在長(zhǎng)期荷載作用下的軸向應(yīng)變-時(shí)間曲線變化趨勢(shì)相同,且經(jīng)歷一定時(shí)間后,它們的軸向應(yīng)變與時(shí)間的對(duì)數(shù)基本呈線性關(guān)系。
[Abstract]:With the extensive application of reinforced earth technology in railway engineering and highway engineering construction, it is more urgent to study the reinforced earth technology deeply. Especially, the application of reinforced materials in viscous fillers leads to the complexity of the interaction between reinforced materials and fillers. The strength of the binding force provided by reinforced materials determines the reinforcement effect of fillers. There are many factors that affect this effect. This paper aims at the compaction degree and the type of reinforced materials. The interaction of reinforced soil is studied by means of experiment, and the reinforced soil under vertical load is tested by the unconfined cylindrical reinforced soil sample. The deformation development and distribution of geogrid are analyzed and compared by setting samples with different compaction degrees and plain soil samples. Two types of geogrid were used to measure the vertical deformation of unconfined cylindrical reinforced soil specimens under long-term load. The effect of different compaction degree on vertical deformation is studied. The following results are obtained: 1) placing reinforced material in soil can improve the ability of resisting deformation, and the tensile modulus of reinforced material. The effective contact area between reinforcement soil and the compaction degree of soil have an important effect on the reinforcement effect. The friction resistance provided by reinforced material to soil actually determines the exertion degree of reinforcement effect. The constraint is caused by the interaction between the reinforcement and soil. For the viscous filler, the reinforced soil can not play its strengthening effect immediately at the initial stage of loading, only after the deformation of the soil reaches a certain degree. The bearing capacity of the soil is obviously higher than that of the plain soil. 3) the strain of the geogrid is determined by the compactness of the soil around the grid and the movement trend of the soil. It will increase the compactness of soil; Along the direction of soil extrusion and diffusion, the tensile strain of grid is the largest. 4) compaction is an important factor affecting vertical deformation of reinforced clay. Increasing compaction can effectively enhance the ability of reinforced soil to resist deformation. Under the same load, the total deformation of the soil can be reduced, and the deformation of the soil can enter the stable state more quickly.) the variation trend of the axial strain-time curve of the plain soil and the reinforced soil under the long-term load is the same. After a certain period of time, their axial strain and the logarithm of time are basically linear.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU472

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