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  本文關(guān)鍵詞： 邊坡穩(wěn)定 安全系數(shù) 開挖爆破 嚴格Janbu法 三維矢量和法 動力有限元　出處：《上海交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：邊坡穩(wěn)定性問題一直是巖土工程學(xué)界十分重視的重要研究課題之一,尤其是邊坡在開挖爆破荷載作用下的穩(wěn)定性問題,在礦山開采、道路工程、水利水電工程等領(lǐng)域的施工過程中都是不可回避的工程問題。對于開挖爆破荷載作用下巖質(zhì)邊坡穩(wěn)定性分析方法的研究是對于邊坡開挖設(shè)計和施工具有極其重要的理論意義和實際工程應(yīng)用價值。本文主要研究內(nèi)容如下:(1)針對極限平衡法中嚴格Janbu法在實際應(yīng)用中存在邊坡條塊劃分過多時安全系數(shù)計算不收斂的問題,本文基于B-樣條函數(shù)具有良好的光滑性、明確的表達式以及緊湊性等特點,而且B-樣條插值函數(shù)系數(shù)求解過程中容易進行矩陣計算、便于編程且計算效率高,提出了采用B-樣條插值函數(shù)來擬合條間力矩,保證條間力矩一階導(dǎo)數(shù)連續(xù)可導(dǎo),從而使得嚴格Janbu法安全系數(shù)計算穩(wěn)定收斂。算例分析表明,此方法是可行和合理的。(2)對爆破振動安全標(biāo)準(zhǔn)進行了探討,分析了爆破振動和天然地震的差異,指出天然地震波加速度時程曲線頻率低,幅值衰減緩慢;爆破振動波加速度時程曲線頻率高,幅值衰減迅速。基于此差異性,綜合考慮爆破振動相位差、幅值衰減等影響因素,在分析實測爆破振動加速度衰減規(guī)律的基礎(chǔ)上,采用擬靜力法與時程分析法相結(jié)合的方法研究了開挖爆破荷載作用下的邊坡穩(wěn)定性問題,給出了安全系數(shù)計算方法和分析步驟。(3)對邊坡抗滑穩(wěn)定矢量和法整體下滑趨勢方向進行了探討,分別分析了將滑移面上實際下滑力合力方向、極限抗滑力合力反方向、以及兩者的角平分線方向作為邊坡抗滑穩(wěn)定整體下滑趨勢方向時的安全系數(shù)計算問題。指出將邊坡滑移面上各面單元的極限抗剪力的合力矢方向作為矢量和法邊坡穩(wěn)定整體下滑趨勢方向最為合理。將動力有限元與三維矢量和法相結(jié)合,給出了爆破荷載作用下邊坡三維矢量和法分析計算過程,通過對一個簡單邊坡的分析計算,驗證了矢量和法對于爆破作用下邊坡穩(wěn)定性分析的可行性。(4)以黃麥嶺磷礦露天邊坡工程為例,根據(jù)實測的加速度時程曲線,綜合考慮振動加速度衰減規(guī)律,采用本文提出的開挖爆破荷載作用下邊坡穩(wěn)定性分析方法和步驟計算了該邊坡兩個滑移面的抗滑穩(wěn)定安全系數(shù),計算結(jié)果與邊坡實際穩(wěn)定性情況基本吻合。
[Abstract]:Slope stability has always been one of the most important research topics in geotechnical engineering field, especially the stability of slope under excavation blasting load, mining in mines, road engineering, The research of rock slope stability analysis method under excavation blasting load is very important for slope excavation design and construction. The main contents of this paper are as follows: (1) in view of the problem that the strict Janbu method in the limit equilibrium method does not converge in the calculation of the safety factor when the slope segments are divided too much, Based on the good smoothness, definite expression and compactness of B-spline function, it is easy to calculate matrix in the process of calculating the coefficients of B-spline interpolation function, and it is easy to program and efficient. A B-spline interpolation function is proposed to fit the moment between strips to ensure the continuous derivation of the first derivative of the moment between strips, so that the safety factor of the strict Janbu method can converge stably. This method is feasible and reasonable. The safety standard of blasting vibration is discussed. The difference between blasting vibration and natural earthquake is analyzed. It is pointed out that the frequency of acceleration time history curve of natural seismic wave is low and the amplitude attenuation is slow. The frequency of the acceleration curve of blasting vibration wave is high and the amplitude attenuation is rapid. Based on this difference, considering the influence factors such as phase difference and amplitude attenuation of blasting vibration, the attenuation law of acceleration of blasting vibration is analyzed. The problem of slope stability under excavation blasting load is studied by using pseudostatic method and time-history analysis method. In this paper, the calculation method of safety factor and the analysis procedure are given. The stability vector of slope anti-slide and the direction of overall slide trend of the method are discussed. The direction of the actual force of sliding force on the slip surface and the direction of the force of ultimate anti-slip force are analyzed respectively. And the calculation of safety factor when the direction of angular bisection line is taken as the direction of overall sliding trend of slope anti-slide stability. It is pointed out that the direction of the force vector of the ultimate shear resistance of the elements on the slip surface of the slope is taken as the vector and the normal edge. The downtrend direction of slope stability is most reasonable. The dynamic finite element method is combined with the three-dimensional vector sum method. In this paper, the analysis and calculation process of three dimensional vector sum method for slope under blasting load is given, and the analysis and calculation of a simple slope are carried out. The feasibility of vector sum method for slope stability analysis under blasting action is verified. (4) taking the open pit slope of Huangmaling Phosphate Mine as an example, according to the measured acceleration time history curve, the law of vibration acceleration attenuation is considered synthetically. Using the method and procedure of slope stability analysis under excavation blasting load presented in this paper, the safety factor of slope stability of two slip planes is calculated. The calculated results are in good agreement with the actual stability of the slope.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU457

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