本文關(guān)鍵詞：土質(zhì)邊坡抗滑樁支護(hù)穩(wěn)定性分析及參數(shù)優(yōu)化　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 土質(zhì)邊坡 抗滑樁 數(shù)值模擬 正交試驗(yàn) 參數(shù)優(yōu)化

【摘要】：邊坡是廣泛分布于地表的一種地貌形態(tài),是普遍存在于各種工程活動(dòng)中的地質(zhì)地貌環(huán)境之一。但是由于邊坡工程是一個(gè)十分復(fù)雜的綜合性的巖土工程難題,如何能夠保證邊坡工程的穩(wěn)定性、經(jīng)濟(jì)性和實(shí)用性仍然是當(dāng)前現(xiàn)代化城市建設(shè)進(jìn)程中一個(gè)非常重要的問題。抗滑樁因?yàn)榫哂羞m用范圍廣、抗滑效果好、對(duì)周圍地質(zhì)環(huán)境影響小等諸多突出的優(yōu)點(diǎn),成為治理滑坡等地質(zhì)災(zāi)害中最主要的一種方法。邊坡工程的穩(wěn)定性受到邊坡自身的結(jié)構(gòu)特性、地形地貌、土體性質(zhì)、地質(zhì)構(gòu)造及抗滑樁的支護(hù)參數(shù)等情況的綜合影響,然而目前對(duì)每種因素的影響機(jī)理及權(quán)重的分析還不是很完善,還需要進(jìn)一步研究和探索。從邊坡抗滑樁支護(hù)的機(jī)理出發(fā),利用Midas/GTS有限元數(shù)值模擬軟件,以安全系數(shù)和抗滑樁的水平位移為邊坡穩(wěn)定性的主要評(píng)價(jià)指標(biāo),使用單因素變量法對(duì)土體強(qiáng)度參數(shù)、坡角、地下水位和樁的位置四個(gè)因素對(duì)邊坡抗滑樁支護(hù)的穩(wěn)定性影響進(jìn)行研究和分析,結(jié)果發(fā)現(xiàn)邊坡的穩(wěn)定性與土體粘聚力、內(nèi)摩擦角、地下水位和坡角顯著相關(guān),但是彈性模量和泊松比對(duì)邊坡穩(wěn)定性影響不大;當(dāng)抗滑樁的位置在邊坡中部時(shí),邊坡的穩(wěn)定性最好。以具體的人工邊坡加固工程為例,利用Midas/GTS數(shù)值模擬軟件,先用單因素變量法分析抗滑樁的樁長(zhǎng)、樁間距和樁徑對(duì)邊坡穩(wěn)定性的影響。然后利用正交試驗(yàn)設(shè)計(jì)的方法,在地層條件和抗滑樁的物理力學(xué)參數(shù)都一樣的前提下,選取樁長(zhǎng)、樁間距和樁徑這三個(gè)因素,以邊坡的安全系數(shù)和抗滑樁的樁頂最大水平位移為評(píng)價(jià)指標(biāo),利用極差分析,發(fā)現(xiàn)樁間距對(duì)邊坡安全系數(shù)和樁頂水平位移的影響都是最大的,其次是樁徑,樁長(zhǎng)的影響最小。根據(jù)以上分析,運(yùn)用Matlab數(shù)學(xué)軟件將樁長(zhǎng)、樁間距和樁徑三個(gè)因素對(duì)邊坡的綜合影響進(jìn)行線性回歸分析,得到相關(guān)的經(jīng)驗(yàn)公式,由此得出邊坡穩(wěn)定性與這三個(gè)因素呈多元線性回歸,并表現(xiàn)為顯著相關(guān)。最后細(xì)化樁間距取值,以間距為單一變量,并結(jié)合其它因素的影響對(duì)該工程抗滑樁支護(hù)進(jìn)行優(yōu)化設(shè)計(jì),并運(yùn)用Matlab數(shù)學(xué)軟件擬合出安全系數(shù)與樁間距的關(guān)系曲線,得到相關(guān)的經(jīng)驗(yàn)公式,為今后解決類似邊坡工程的穩(wěn)定性問題提供參考。
[Abstract]:Slope is a kind of geomorphologic form widely distributed on the surface, which is one of the geological and geomorphological environments in various engineering activities. However, slope engineering is a very complex and comprehensive geotechnical engineering problem. How to ensure the stability of slope engineering, economy and practicality is still a very important problem in the process of modern urban construction. Anti-slide pile has a wide range of application, good anti-slide effect. Many outstanding advantages, such as small influence on the surrounding geological environment, have become the most important method in the treatment of landslide and other geological disasters. The stability of slope engineering is affected by the structural characteristics of the slope itself, topography and geomorphology, and soil properties. The comprehensive influence of geological structure and supporting parameters of anti-slide pile, however, the analysis of the influence mechanism and weight of each factor is not perfect. According to the mechanism of slope anti-slide pile support, Midas/GTS finite element numerical simulation software is used. Taking the safety factor and horizontal displacement of anti-slide pile as the main evaluation index of slope stability, the single factor variable method is used to evaluate the soil strength parameters and slope angle. The influence of groundwater level and pile position on the stability of slope anti-slide pile support is studied and analyzed. The results show that the stability of slope is significantly related to the cohesion of soil, the angle of internal friction, the groundwater level and the angle of slope. However, elastic modulus and Poisson ratio have little effect on slope stability. When the anti-slide pile is located in the middle of the slope, the stability of the slope is the best. Taking the concrete artificial slope reinforcement project as an example, the numerical simulation software Midas/GTS is used. The single factor variable method is used to analyze the influence of pile length, pile spacing and pile diameter on slope stability, and then the orthogonal design method is used. On the premise of the same physical and mechanical parameters of the anti-slide pile, the safety factor of slope and the maximum horizontal displacement of the pile top are taken as the evaluation index, and the pile length, the pile spacing and the pile diameter are selected as the three factors. By means of range analysis, it is found that the influence of pile spacing on slope safety factor and pile top horizontal displacement is the largest, followed by pile diameter and pile length. The comprehensive influence of pile length, pile spacing and pile diameter on slope is analyzed by Matlab software, and relevant empirical formulas are obtained. It is concluded that the slope stability is multiple linear regression with these three factors, and the correlation is significant. Finally, the value of pile spacing is refined, and the spacing is taken as a single variable. Combined with other factors to optimize the design of anti-slide pile support, and use Matlab mathematical software to fit the relationship curve between safety factor and pile spacing, and get the relevant empirical formula. It provides a reference for solving the stability problem of similar slope engineering in the future.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU753.8;TU43

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