【摘要】：擋土墻結(jié)構(gòu)目前已在公路、鐵路、港口工程、建筑工程等領(lǐng)域中得到了較為廣泛的應(yīng)用,然而在諸多擋土墻結(jié)構(gòu)物中,由于受到墻背土壓力、外界荷載等因素的影響,有部分擋土墻結(jié)構(gòu)物會(huì)發(fā)生一定程度的側(cè)向位移。對(duì)此,為降低擋土墻側(cè)向位移對(duì)工程安全和環(huán)境產(chǎn)生的不利影響,論文以工程實(shí)際為依托,綜合利用室內(nèi)試驗(yàn)和有限元仿真相結(jié)合的方法對(duì)擋土墻側(cè)向位移修復(fù)結(jié)構(gòu)進(jìn)行研究,主要得到以下結(jié)論:(1)基于擋土墻側(cè)向位移的影響因素及其組成情況,設(shè)計(jì)了一種擋土墻側(cè)向位移修復(fù)結(jié)構(gòu),該結(jié)構(gòu)不僅可以有效修復(fù)原有擋土墻的側(cè)向位移,還能增強(qiáng)擋土墻的穩(wěn)定性;(2)結(jié)合工程實(shí)際情況和所設(shè)計(jì)結(jié)構(gòu)的受力特性,設(shè)計(jì)了相應(yīng)的室內(nèi)試驗(yàn)?zāi)Ｐ?研究確定了模型的測(cè)試元件、土性參數(shù)、試驗(yàn)過(guò)程以及試驗(yàn)內(nèi)容;(3)利用所設(shè)計(jì)的室內(nèi)試驗(yàn)?zāi)Ｐ瓦M(jìn)行側(cè)向位移修復(fù)試驗(yàn),通過(guò)試驗(yàn)可以看出,所設(shè)計(jì)模型能夠?qū)崿F(xiàn)對(duì)擋土墻側(cè)向位移的修復(fù),而且隨著擋土墻側(cè)向位移修復(fù)量的逐漸增加,頂壓力、擋土墻應(yīng)力、墻背土壓力都呈現(xiàn)逐漸增大的趨勢(shì);(4)綜合考慮所設(shè)計(jì)結(jié)構(gòu)和室內(nèi)模型成果,建立了仿真分析模型,從仿真分析結(jié)果來(lái)看:頂壓方向與水平夾角為30o、頂壓位置距墻頂15cm、取土孔直徑0.08m、取土孔距墻0.3m時(shí),擋土墻側(cè)向位移修復(fù)過(guò)程中的頂壓力、擋土墻應(yīng)力、墻后土壓力最小;當(dāng)墻背填土為砂性土?xí)r,頂壓力、擋土墻應(yīng)力、墻后土壓力最大;在頂壓方向、頂壓位置、墻后取土孔大小、墻后取土孔位置、墻后土體土性參數(shù)五種因素中,墻后取土孔大小和墻后土體土性參數(shù)對(duì)擋土墻結(jié)構(gòu)物的力學(xué)性能影響較大。
[Abstract]:Retaining wall structure has been widely used in highway, railway, port engineering, construction engineering and so on. However, in many retaining wall structures, due to the influence of earth pressure on the back of the wall, external load and other factors, the retaining wall structure has been widely used in the field of highway, railway, port engineering, construction engineering and so on. Some retaining wall structures will have a certain degree of lateral displacement. In order to reduce the adverse effect of lateral displacement of retaining wall on engineering safety and environment, the paper studies the lateral displacement repair structure of retaining wall based on the engineering practice and the combination of indoor test and finite element simulation. The main conclusions are as follows: (1) based on the influencing factors of lateral displacement of retaining wall and its composition, a retaining wall lateral displacement repair structure is designed, which can not only effectively repair the lateral displacement of the original retaining wall, It can also enhance the stability of retaining wall. (2) according to the actual situation of the project and the mechanical characteristics of the designed structure, the corresponding indoor test model is designed, and the test elements, soil property parameters, test process and test contents of the model are studied and determined. (3) using the designed indoor test model to carry out lateral displacement repair test, it can be seen that the designed model can be used to repair the lateral displacement of retaining wall, and with the increase of the amount of lateral displacement of retaining wall, The top pressure, the stress of retaining wall and the earth pressure on the back of the wall are gradually increasing. (4) considering the designed structure and indoor model results, the simulation analysis model is established. The simulation results show that the angle between the top pressure direction and the horizontal angle is 30o. the top pressure position is 15cm from the top of the wall, and the diameter of the earth sampling hole is 0.08m. When the hole is 0.3m away from the wall, the top pressure of retaining wall, the stress of retaining wall, and the earth pressure behind the wall are the least in the course of lateral displacement repair. When the backfill of the wall is sandy, the top pressure, the stress of the retaining wall and the earth pressure behind the wall are the largest. In the top pressure direction, the top pressure position, the size of the retaining hole behind the wall, the location of the soil hole behind the wall, and the soil property parameters behind the wall, the size of the retaining wall hole and the soil property parameter behind the wall have a great influence on the mechanical properties of the retaining wall structure.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU476.4

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