本文選題：廢舊輪胎 + 交通荷載　； 參考：《湖北工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著我國(guó)經(jīng)濟(jì)發(fā)展的深入,國(guó)內(nèi)高速公路建設(shè)的基本完善,物流行業(yè)的大力發(fā)展,運(yùn)輸車輛也逐年增多。近年來(lái)各地超長(zhǎng)超重車輛大量出現(xiàn),給道路工程帶來(lái)了嚴(yán)重危害。因此,針對(duì)加筋土擋墻在交通荷載作用下的動(dòng)力特性的研究深受重視。同時(shí),車輛數(shù)量的增加,將面臨更多有關(guān)廢舊輪胎的處理問(wèn)題。廢舊輪胎抗拉強(qiáng)度高、抗磨損、抗老化、韌性高、防震性能優(yōu)良,輪胎加筋施工快速簡(jiǎn)單,成本低廉,具有良好的變形適應(yīng)性能和長(zhǎng)期穩(wěn)定性。近年來(lái),越來(lái)越多的廢舊輪胎作為加筋材料,被應(yīng)用到加筋擋土墻中。本文將廢舊輪胎與雙向格柵組合形成共同加筋體,作用在加筋土擋墻中,通過(guò)室內(nèi)模型試驗(yàn),將對(duì)輪胎-格柵加筋土擋墻在交通荷載下力學(xué)性能展開深入研究。本文通過(guò)自主研發(fā)的交通循環(huán)荷載施加裝置對(duì)試驗(yàn)中交通荷載進(jìn)行模擬,對(duì)輪胎-雙向格柵加筋土擋墻開展了室內(nèi)模型試驗(yàn)。將雙向格柵、輪胎、土工格室與輪胎-格柵組合筋材進(jìn)行加筋對(duì)比分析,通過(guò)對(duì)相同車速、不同車輛載荷的情況進(jìn)行模擬,分析不同加筋土擋墻的加速度、動(dòng)土壓力、墻面變形,研究其在交通荷載作用下的動(dòng)力學(xué)特性和墻面變形的規(guī)律。試驗(yàn)結(jié)果表明:輪胎-格柵加筋材料相比土工格室、輪胎和土工格柵單一加筋,更有利于提高擋土墻的抗震性能和穩(wěn)定性,減少墻面變形。在輪胎-格柵組合加筋方案中,輪胎布置間距相隔輪胎半徑大小的方案效果較優(yōu),且可節(jié)約30%的材料成本。因此,根據(jù)最優(yōu)輪胎-格柵組合方案,分析了在不同車速條件下?lián)鯄Φ膭?dòng)態(tài)響應(yīng)特性和規(guī)律。在交通荷載作用下,輪胎-格柵加筋土擋墻面板變形和加速度大小隨相對(duì)墻高增大而增大,最大變形位于相對(duì)墻高y/H=0.7處,加速度在墻頂達(dá)到峰值。動(dòng)土壓力隨荷載幅值改變發(fā)生相應(yīng)變化,在達(dá)到峰值后,增加速率變緩并趨于穩(wěn)定。通過(guò)函數(shù)擬合,加速度放大系數(shù)隨相對(duì)墻高的增大呈指數(shù)函數(shù)放大,同時(shí)隨著相對(duì)荷載幅值的增大呈對(duì)數(shù)函數(shù)增加。最后,本文通過(guò)動(dòng)、靜試驗(yàn)對(duì)比,對(duì)輪胎-格柵加筋土擋墻墻頂累積沉降與土壓力進(jìn)行對(duì)比分析。在相同幅值大小的靜載與循環(huán)荷載下,兩次循環(huán)加載后的累積沉降逐漸超過(guò)靜載作用下的累積沉降;四次循環(huán)加載后的動(dòng)土壓力峰值逐漸超過(guò)靜載作用下土壓力峰值。穩(wěn)定后60km/h的交通荷載下土壓力峰值超出同等靜載幅值下土壓力峰值20%。因此,擋墻累積沉降與動(dòng)土壓力受循環(huán)加載次數(shù)與加載時(shí)長(zhǎng)的共同作用而變化。
[Abstract]:With the development of economy, the improvement of highway construction and the development of logistics industry, the number of transport vehicles is increasing year by year. In recent years, a large number of super-long and overweight vehicles appear in various places, which brings serious harm to road engineering. Therefore, the study of the dynamic characteristics of reinforced earth retaining wall under traffic load is paid more attention. At the same time, the increase in the number of vehicles, will face more problems with the disposal of used tyres. Waste tires have high tensile strength, wear resistance, aging resistance, high toughness, excellent seismic resistance, rapid and simple construction of tire reinforcement, low cost, good deformation adaptability and long-term stability. In recent years, more and more used tires as reinforced materials are used in reinforced retaining walls. In this paper, the waste tire and bidirectional grille are combined to form a reinforced body, which acts on the reinforced earth retaining wall. Through the indoor model test, the mechanical properties of the tire and grille reinforced earth retaining wall under traffic load are studied in depth. In this paper, the traffic load is simulated by the self-developed traffic cyclic loading device, and the indoor model test is carried out for the tire and bidirectional grille reinforced earth retaining wall. By comparing and analyzing the reinforcement of two-way grille, tire, geogrid and tire grille composite reinforcement, the acceleration and dynamic earth pressure of different reinforced earth retaining wall are analyzed by simulating the situation of the same speed and different vehicle loads. The dynamic characteristics of wall deformation under traffic load and the law of wall deformation are studied. The experimental results show that compared with geogrid reinforced material, single reinforcement of tire and geogrid can improve the seismic performance and stability of retaining wall and reduce the deformation of wall. In the combination reinforcement scheme of tire and grille, the effect of tire layout spacing separated by tire radius is better, and the material cost can be saved by 30%. Therefore, according to the optimal tire-grille combination scheme, the dynamic response characteristics and laws of the retaining wall under different speed conditions are analyzed. Under the action of traffic load, the deformation and acceleration increase with the increase of the relative wall height. The maximum deformation is located at the relative wall height y/H=0.7, and the acceleration reaches the peak at the top of the wall. The dynamic earth pressure changes with the change of load amplitude. After reaching the peak value, the increasing rate slows down and tends to be stable. Through the function fitting, the acceleration magnification coefficient increases exponentially with the increase of the relative wall height and the logarithmic function with the increase of the relative load amplitude. Finally, through dynamic and static test, the cumulative settlement and earth pressure on the top of reinforced earth retaining wall with tire and grille are compared and analyzed. Under the same amplitude of static load and cyclic load, the cumulative settlement after twice cyclic loading gradually exceeds the accumulated settlement under static load, and the peak value of dynamic earth pressure after four cyclic loading gradually exceeds the peak value of soil pressure under static load. The peak value of earth pressure under traffic load of 60km/h after stabilization is higher than that under the same static load amplitude of 20. Therefore, the cumulative settlement and the dynamic earth pressure of the retaining wall are influenced by the cyclic loading times and the loading time.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U417.11

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