發(fā)布時(shí)間：2018-06-30 02:50

  本文選題：連接式土工袋 + 擋土墻��； 參考：《重慶大學(xué)》2016年碩士論文

【摘要】：土工袋是指裝入土、砂等填料后形成的袋狀物。其具有袋內(nèi)填料不受限制、抗壓強(qiáng)度高、減振、防凍融、抗堿性好等諸多優(yōu)點(diǎn),已被應(yīng)用于地基加固、樁型復(fù)合地基、生態(tài)護(hù)坡、河海護(hù)堤、防凍脹和處理膨脹土、淤泥土等工程中。雖土工袋性能優(yōu)越,而擋土墻又是巖土工程中很重要的一種結(jié)構(gòu)形式,但因傳統(tǒng)土工袋工法由多個(gè)袋體堆疊組合而成,袋體切斷了內(nèi)部填料間的聯(lián)系,因此,土工袋在擋土墻中的應(yīng)用需克服其整體性能差的缺點(diǎn)。針對(duì)土工袋擋土墻因上部土工袋摩擦滑移發(fā)生破壞的特征,本論文提出了連接式土工袋擋土墻的解決方案。連接式土工袋由帶孔長(zhǎng)方體土工袋和包塑不銹鋼扎帶組成,該方案可提高土工袋的承載能力和層間摩擦力。針對(duì)連接式土工袋的結(jié)構(gòu)性能,論文做了以下幾方面的研究:(1)基于土工袋擋土墻模型試驗(yàn)探討了土工袋擋土墻的破壞模式,并從理論上分析了連接式土工袋擋土墻的工作機(jī)理。分析表明:連接式土工袋擋土墻的扎帶受力后會(huì)產(chǎn)生一個(gè)拉力,該拉力可以起到增加擋土墻整體性的作用。(2)在土工模型槽中進(jìn)行了連接式土工袋擋土墻模型試驗(yàn),分別對(duì)擋土墻位移模式、墻后水平土壓力、墻內(nèi)水平土壓力、墻后豎向土壓力及扎帶內(nèi)力進(jìn)行了研究。試驗(yàn)表明:連接式土工袋擋土墻較傳統(tǒng)土工袋擋土墻承載力提高了約3倍,而破壞變形卻減小了一半。(3)采用ABAQUS先模擬了土工袋單軸壓縮試驗(yàn),構(gòu)建數(shù)值模擬時(shí)土工袋的本構(gòu)模型,再分別模擬了土工袋擋土墻和連接式土工袋擋土墻以作對(duì)比。模擬結(jié)果驗(yàn)證了連接式土工袋擋土墻承載能力及變形性能均優(yōu)于土工袋擋土墻的結(jié)論。(4)針對(duì)連接式土工袋結(jié)構(gòu)在研究過(guò)程中發(fā)現(xiàn)的問(wèn)題,對(duì)其施工工法做了改進(jìn)。同時(shí),結(jié)合工程實(shí)際應(yīng)用,提出了包裹土工袋式加筋土擋土墻和貫穿土工袋式連續(xù)墻兩種方案,并研究了兩種方案的施工工法、適用情況及注意事項(xiàng)。論文創(chuàng)新點(diǎn)在于提出了一種連接式土工袋擋土墻方案,并從理論、模型試驗(yàn)、數(shù)值模擬三個(gè)方面進(jìn)行了研究,最后探討了該方案在工程應(yīng)用中的適用性及可行性。這種方法解決了傳統(tǒng)土工袋擋土墻整體性能差的缺點(diǎn),并且適用范圍廣,從而為擋土墻的研究和應(yīng)用提供了新的思路。
[Abstract]:Geotextiles are bags formed after filling with soil, sand and other fillers. It has many advantages, such as unlimited packing in bag, high compressive strength, vibration reduction, freezing and thawing resistance, good alkali resistance and so on. It has been used in foundation strengthening, pile type composite foundation, ecological slope protection, river and sea berm, frost heave prevention and treatment of expansive soil. In a project such as silt. Although the performance of geotextile bags is superior, and retaining wall is an important structural form in geotechnical engineering, because the traditional geotechnical bag method is composed of several bags, the bag body cuts off the connection between internal fillers. The application of geo-bag in retaining wall needs to overcome the shortcoming of its poor overall performance. In view of the characteristics of the earth bag retaining wall caused by friction and slip of the upper soil bag, this paper puts forward the solution of the connected earth bag retaining wall. The connected earth bag is composed of cuboid geotextile bag with holes and stainless steel strapping belt. This scheme can improve the bearing capacity and the friction between layers of the bag. According to the structural performance of the connected soil bag, the following aspects are studied in this paper: (1) based on the model test of the earth bag retaining wall, the failure mode of the soil bag retaining wall is discussed, and the working mechanism of the connected soil bag retaining wall is analyzed theoretically. The analysis shows that a tensile force will be produced after the tie band of the connected geotextile retaining wall is loaded, and this tension can increase the integrity of the retaining wall. (2) the model test of the connected geotextile retaining wall is carried out in the geotechnical model slot. The displacement model of retaining wall, the horizontal earth pressure behind the wall, the horizontal earth pressure inside the wall, the vertical earth pressure behind the wall and the internal force of the tie band are studied respectively. The test results show that the bearing capacity of the connected soil bag retaining wall is increased about 3 times than that of the traditional earth bag retaining wall, while the failure deformation is reduced by half. (3) Abaqus is used to simulate the uniaxial compression test of the soil bag. The constitutive model of geotextile bag is constructed, and then the geotextile retaining wall and the connected geotextile retaining wall are simulated and compared respectively. The simulation results verify the conclusion that the load carrying capacity and deformation performance of the connected geo-bag retaining wall are better than that of the geo-bag retaining wall. (4) the construction method of the connected geotextile bag structure is improved in view of the problems found in the research process. At the same time, combined with the practical application of the project, two schemes of encased geo-bag reinforced earth retaining wall and perforated geotechnical bag continuous wall are put forward, and the construction methods of the two schemes, their application and points for attention are studied. The innovation of this paper is to put forward a kind of connected geo-bag retaining wall scheme, and to study it from three aspects: theory, model test and numerical simulation. Finally, the applicability and feasibility of the scheme in engineering application are discussed. This method solves the shortcoming of the traditional geo-bag retaining wall with poor overall performance and has a wide range of application, thus providing a new way of thinking for the research and application of the retaining wall.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TU476.4

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本文編號(hào)：2084524