本文關(guān)鍵詞：基于響應面法的土質(zhì)邊坡可靠度數(shù)值模擬研究　出處：《長沙理工大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 邊坡可靠度 有限元強度折減法 響應面法 變異系數(shù) 敏感性評價指標

【摘要】：自巖土力學建立以來,邊坡穩(wěn)定性問題便一直受到學術(shù)界與工程界的廣泛關(guān)注。在過去很長一段時間內(nèi),用一個確定的值來對邊坡穩(wěn)定程度進行描述是唯一能夠選擇的方法,但在19世紀50年代可靠度理論誕生之后,一種新的邊坡穩(wěn)定性分析方法進入了人們的視野,這種方法彌補了之前確定性分析方法的不足,在概率論的基礎上,將邊坡工程中各種影響因素的不確定性加以量化從而進行更加深入的分析。本篇文章的主要研究內(nèi)容為：一、根據(jù)邊坡工程的特點,對已有的相關(guān)理論加以優(yōu)化,從而提出一種兼容性好、計算精度高、并且實用性較強的邊坡可靠度計算方案；二、分析可靠概率Ps對抗剪強度參數(shù)變異系數(shù)δ_φ和δ_c的敏感性,并對其敏感程度進行量化評估。在前者中,本文首先總結(jié)了部分巖土體物理力學參數(shù)變異系數(shù)的取值范圍,然后運用響應面法結(jié)合少量基于有限元強度折減法的邊坡穩(wěn)定性模擬實驗,獲得了邊坡的近似極限狀態(tài)函數(shù),最后通過聯(lián)合概率密度函數(shù)積分法對邊坡可靠度進行了求解；在后者中,本文通過matlab軟件,建立起了可靠概率P_s與變異系數(shù)δ_φ和δ_c間的函數(shù)關(guān)系,以此為基礎就可靠概率P_s對抗剪強度參數(shù)變異系數(shù)δ_φ和δ_c的敏感性進行了分析,并總結(jié)了其變化規(guī)律,最后提出將Ps≥99.65%所對應的區(qū)域與整個分析區(qū)域的比值S_A/(S_A+S_B)作為其敏感性強弱程度的評價指標,并在某高速公路第11標K49+080-K49+250右側(cè)邊坡的可靠度分析中做了應用。此指標的計算結(jié)果能夠較好的反應邊坡的可靠度是否穩(wěn)定,從而在一定程度上指導設計人員對邊坡工程進行更加合理的設計。
[Abstract]:Since the establishment of geotechnical mechanics, slope stability has been widely concerned by the academic and engineering circles, in the past a long time. Describing the slope stability by a certain value is the only method that can be chosen, but after 1850s, the reliability theory was born. A new method of slope stability analysis has entered the field of vision. This method makes up for the shortcomings of the previous deterministic analysis method and is based on probability theory. The uncertainty of various influencing factors in slope engineering is quantified to make more in-depth analysis. The main contents of this paper are as follows: first, according to the characteristics of slope engineering. The existing related theories are optimized, and a slope reliability calculation scheme with good compatibility, high calculation precision and strong practicability is put forward. Secondly, the sensitivity of reliability probability Ps to shear strength parameter variation coefficient 未 _ 蠁 and 未 -ac is analyzed, and its sensitivity is evaluated quantitatively in the former. In this paper, the range of variation coefficient of physical and mechanical parameters of some rock and soil is summarized, and then the slope stability simulation experiment based on finite element strength reduction method is carried out by using response surface method and a small amount of finite element strength reduction method. The approximate limit state function of the slope is obtained, and the reliability of the slope is solved by the joint probability density function integration method. In the latter case, the functional relationship between reliable probabilistic PHS and coefficients of variation 未 _ 蠁 and 未 -C is established by means of matlab software. On the basis of this, the sensitivity of the coefficient of variation (未 _ 蠁) and the coefficient of variation (未 _ (c)) of the reliable probabilistic PSAs to shear strength parameters are analyzed, and the variation rules are summarized. Finally, it is proposed that the ratio of regions corresponding to Ps 鈮，

本文編號：1382559