本文關鍵詞： 邊坡 地震 改進的擬靜力法 強度折減法 旋轉(zhuǎn)坐標法　出處：《重慶大學》2015年碩士論文　論文類型：學位論文

【摘要】：在公路、鐵路和水利等工程的建設中,往往需要修建邊坡,邊坡工程對我國的國民經(jīng)濟建設有著不可估量的重要作用。人工邊坡為基礎設施建設提供有力保障,同時也為人們生產(chǎn)生活提供了巨大的便利。然而邊坡的穩(wěn)定性問題也嚴重影響到公路、鐵路和水利等工程施工和運營的安全性。我國處在世界上兩個最大地震發(fā)生的最集中地帶之間,并受到印度板塊、菲律賓海洋板塊和印度板塊的相互擠壓,使得地震斷裂帶不斷發(fā)展。因此,對在地震作用下邊坡的穩(wěn)定性分析顯得十分重要,并且具有很大的現(xiàn)實意義。尤其是我國在2008年經(jīng)歷了汶川地震之后,特大地震對于山區(qū)滑坡造成的危害使得更多的學者重視邊坡在地震作用時穩(wěn)定性的研究。為此,本文就邊坡地震穩(wěn)定性分析中的擬靜力法做了一些初步的研究工作。本文的主要內(nèi)容及結(jié)論如下:①首先,提出邊坡穩(wěn)定性分析的理論基礎,再分別闡述靜力作用下和地震作用下邊坡穩(wěn)定性的分析方法�；陟o力和地震作用下邊坡穩(wěn)定性分析的研究現(xiàn)狀指出地震作用下擬靜力分析的優(yōu)缺點,從而引出本文要研究的內(nèi)容;②對擬靜力法進行全面的分析,針對在豎向條分時計算水平地震力與抗滑力矩時的誤差進行分析得出以下結(jié)論:計算地震慣性力有很大的誤差,同時抗滑力矩計算結(jié)果比真實的抗滑力矩偏低。由于人們過于看重水平地震力對邊坡的產(chǎn)生破壞,而忽略了豎向地震力的影響,因此本論文中地震加速度考慮是斜向的。在考慮斜向加速度的情況下,改進了擬靜力法即:由豎向地震慣性力與土條重力引起的滑動力矩和抗滑動力矩,采用豎向條分計算;由水平地震慣性力引起的滑動力矩和抗滑動力矩,采用水平條分計算;最后再進行疊加;③利用有限元分析的合理性,考慮土體應力與應變關系,采用強度折減法進行邊坡的擬靜力強度折減法來分析穩(wěn)定性。利用改進的擬靜力法同強度折減法對同一個算例進行對比,分析計算的結(jié)果發(fā)現(xiàn)強度折減法安全系數(shù)偏小。通過分析還發(fā)現(xiàn)在強度折減法的模型中,地震慣性力的水平地震力與豎向地震力是對整個模型而言的,然而在改進擬靜力法中并沒有考慮最危險圓弧滑面底部弓形體的擬地震力,僅僅只是分析了圓弧滑面以上條分土條所受到的水平地震力、豎向地震力和重力。這就說明改進的擬靜力法仍然需要進一步完善;④基于改進的擬靜力法與強度折減法的對比所發(fā)現(xiàn)的問題,提出了一種新的計算方法,即通過旋轉(zhuǎn)原來的坐標將地震力與重力進行矢量疊加,以形成合力,并在合力的方向上建立與合力垂直的新的X坐標,使得地震的邊坡穩(wěn)定問題變?yōu)榻?jīng)過土體參數(shù)和邊坡幾何尺寸修正形成新的邊坡,從而只需進行靜力分析即可。為印證新方法的可行性,使用改進的擬靜力法與強度折減法對同一個算例進行計算,將其結(jié)果同之前的兩個安全系數(shù)進行對比,發(fā)現(xiàn)旋轉(zhuǎn)坐標法結(jié)論與強度折減法結(jié)論接近,且數(shù)值上都偏小,說明采用旋轉(zhuǎn)坐標法避開了改進的擬靜力法沒有考慮最危險圓弧滑面下部地震力的問題,該分析方法是可行的,并沒有影響擬靜力分析方法本身;⑤為提高旋轉(zhuǎn)坐標的實用性,考慮了水下邊坡在地震作用下安全系數(shù)的計算。通過旋轉(zhuǎn)坐標法、靜力計算法與理論推導公式等傳統(tǒng)的方法進行對比,分析其結(jié)果的準確性,發(fā)現(xiàn)數(shù)值分析的方法與理論分析的方法所得出的結(jié)論相差不大,這說明對于水下邊坡的旋轉(zhuǎn)坐標法可以用于地震作用下的水位邊坡分析;⑥以一個實際的邊坡為例,采用傳遞系數(shù)法計算一般工況下邊坡穩(wěn)定性并采用改進的擬靜力法和旋轉(zhuǎn)坐標法校核地震作用下邊坡的穩(wěn)定性。結(jié)果表明旋轉(zhuǎn)坐標法得到的穩(wěn)定系數(shù)比改進的擬靜力法偏小,采用該方法計算更偏于安全,因而更合理。
[Abstract]:In the construction of highway, railway and water conservancy projects, often requires the construction of slope, plays an important role in national economic construction of slope engineering in our country. To provide effective protection of artificial slope for the infrastructure construction, but also provides great convenience for the production and life of the people. However, the stability problem of slope is also seriously affected highway, railway safety and water conservancy project construction and operation of our country. Among the most concentrated areas of the largest earthquake occurred in the two world, and by the India plate, squeezing Philippines Ocean plate and India plate, with the continuous development of the earthquake fault. Therefore, the stability of slope under earthquake analysis is is very important, which has great practical significance. Especially after our country has experienced the Wenchuan earthquake in 2008, earthquake for the harm of the mountain landslide More and more scholars pay attention to the study of slope stability under earthquake. Therefore, this article makes some preliminary research on the pseudo static analysis of seismic stability of slope. The main contents and conclusions of this paper are as follows: firstly, the theoretical basis of slope stability analysis, and then describes the analysis methods of slope stability under static load and under the earthquake. Research status analysis of slope stability under earthquake static and points out the advantages and disadvantages of static analysis based on quasi earthquake, which leads to the content of this paper to study; second, to conduct a comprehensive analysis of the pseudo static method, aiming at the vertical slice when calculating the horizontal seismic force and anti sliding moment of the error the analysis draws the following conclusions: the calculation of seismic inertial force has a great error, and anti sliding moment calculation results than the low anti slip torque because people focus too much on the real. The level of earthquake damage to the slope, while ignoring the influence of the vertical earthquake force, so this paper is inclined to consider the earthquake acceleration. Considering the oblique acceleration induced by the improved quasi-static method: sliding moment caused by vertical seismic inertia force and the gravity of the earth and anti sliding moment. The vertical slice method; sliding moment caused by horizontal seismic inertial force and anti sliding moment, using horizontal slice calculation; finally the rationality of superposition; using finite element analysis, considering the relationship between stress and strain, the quasi-static strength reduction of slope by strength reduction method to analyze the stability. By using the improved quasi-static method with strength reduction method on the same example compared the results found that safety factor of strength reduction is small. Also found in the model of strength reduction method through the analysis. Horizontal earthquake and vertical earthquake force earthquake inertia force of the whole model, however, in the modified pseudo static method is not intended to force the most dangerous slip surface seismic bottom toxoplasmatic consideration, just above the analysis of circular slip surface of soil strip by horizontal seismic force, vertical seismic force and gravity. This shows that still need to further improve the improved quasi static method; the comparison of pseudo static method and strength reduction method based on improved problems, puts forward a new calculation method, namely the earthquake force vector superposition and gravitational force by coordinate rotation of the original, to form a joint force, and establishment and force the new X coordinates in the vertical direction of the force on the slope stability problem of earthquake into the soil parameters and slope geometry correction to form a new slope, thus requiring the static analysis for the new evidence. The feasibility of the method, using the pseudo static method and strength reduction method with a calculation example of improvement, the results of the two safety factor before the same comparison, found the rotating coordinate method and strength reduction method is close to the conclusion conclusion, and the values are small, the rotating coordinate method to avoid the improved static method does not consider the most dangerous part of the seismic force of circular slip surface, the analysis method is feasible, and has no effect on pseudo static analysis method itself; in order to improve the practicality of rotating coordinates, considering the calculation of underwater safety coefficient of slope under earthquake. By rotating coordinate method, static calculation method with the theoretical formula, comparing to the traditional, the accuracy of analysis results, found the method of numerical analysis and theoretical analysis of the conclusion of the difference, it shows that the water slope under rotation Coordinate method can be used for the analysis of water level slope under earthquake; according to an actual slope as an example, by using transfer coefficient method to calculate the slope stability under normal conditions and using the quasi static method of slope stability and the rotating coordinate method checking under earthquake. The results show that the improved stability coefficient obtained rotating coordinate method is smaller than the quasi static method is improved, using the method of calculation is more secure, and more reasonable.

【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU435

【相似文獻】

相關期刊論文 前4條

1 吳忠懷,吳武勝,龔曉南;強夯置換深度估算的擬靜力法[J];華東地質(zhì)學院學報;2001年04期

2 程國偉;趙雪勝;李玲;;基于擬靜力法的加筋邊坡地震穩(wěn)定性分析[J];長江大學學報(自然科學版)理工卷;2009年04期

3 劉杰;李建林;張玉燈;屈建軍;李劍武;李映霞;;基于擬靜力法的大崗山壩肩邊坡地震工況穩(wěn)定性分析[J];巖石力學與工程學報;2009年08期

4 ;[J];;年期

相關會議論文 前1條

1 閻紅梅;李效泉;張群波;;黃河小浪底工程進水塔擬靜力法穩(wěn)定分析[A];第十屆全國結(jié)構(gòu)工程學術(shù)會議論文集第Ⅲ卷[C];2001年

相關碩士學位論文 前1條

1 祝荃們;邊坡地震穩(wěn)定性分析擬靜力法的改進[D];重慶大學;2015年

，

本文編號：1489180