本文選題：滑坡 + 地震穩(wěn)定性　； 參考：《云南大學(xué)》2015年碩士論文

【摘要】：滑坡災(zāi)害破壞性大、治理難度高,特別是地震作用下的穩(wěn)定性問題十分復(fù)雜,涉及到多門學(xué)科,目前仍是土木工程界的一大難題。 本文以小灣滑坡、花坪滑坡和八浪溝滑坡為研究對象,運(yùn)用傳遞系數(shù)法和Janbu法計(jì)算了滑坡的穩(wěn)定系數(shù)。研究兩種方法計(jì)算結(jié)果的差異,發(fā)現(xiàn)：兩算法計(jì)算結(jié)果的變化量小于0.05且變化率I小于4.5%,因此傳遞系數(shù)法與Janbu法計(jì)算的滑坡穩(wěn)定系數(shù)都是合理的,Janbu法的計(jì)算結(jié)果相對偏于保守。 運(yùn)用Janbu法分析了滑體土容重、滑帶土粘聚力和內(nèi)摩擦角三個(gè)工程參數(shù)對滑坡穩(wěn)定性的影響：滑體土的容重與穩(wěn)定系數(shù)呈負(fù)相關(guān),滑帶土的粘聚力、內(nèi)摩擦角與穩(wěn)定系數(shù)呈正相關(guān),其中滑坡穩(wěn)定系數(shù)對滑帶土內(nèi)摩擦角的變化最為敏感。進(jìn)而分析了地震發(fā)生時(shí),各工程參數(shù)對滑坡穩(wěn)定性影響的變化：地震作用下,各工程參數(shù)對滑坡穩(wěn)定性影響的總體趨勢不變,但影響程度均有小幅度降低。 運(yùn)用有限元法,輸入三種實(shí)際地震波,計(jì)算分析了三個(gè)滑坡在小震、中震、大震作用下的穩(wěn)定性,其中地震響應(yīng)計(jì)算方法為等效線性化法,穩(wěn)定性計(jì)算方法為有限元應(yīng)力法,得到了滑坡在地震作用下的穩(wěn)定系數(shù)時(shí)程曲線。分析計(jì)算結(jié)果發(fā)現(xiàn)：滑坡穩(wěn)定系數(shù)最小的時(shí)刻并不是地震波加速度最大的時(shí)刻；地震波的選取對地震穩(wěn)定性分析結(jié)果的影響極大：在不同地震作用下,原本穩(wěn)定的滑坡均存在不同程度的失穩(wěn)現(xiàn)象。 最后,對比分析了幾種滑坡地震穩(wěn)定性計(jì)算方法的優(yōu)劣,并針對防治工程等級(jí)為Ⅰ級(jí)、Ⅱ級(jí)、Ⅲ級(jí)的三類滑坡提出了地震穩(wěn)定性評價(jià)建議。 通過對滑坡地震穩(wěn)定性評價(jià)方法的研究,不僅揭示滑坡在地震作用下的穩(wěn)定性變化規(guī)律,探討了滑坡地震穩(wěn)定性的評價(jià)方法和影響因素,還提出了工程上評價(jià)滑坡地震穩(wěn)定性的建議。
[Abstract]:Landslide disaster is very destructive and difficult to manage, especially the stability problem under earthquake is very complex, which involves many disciplines, and is still a difficult problem in civil engineering field at present. In this paper, the stability coefficient of Xiaowan landslide, Huaping landslide and Balanggou landslide are calculated by transfer coefficient method and Janbu method. By studying the difference between the two methods, it is found that the variation of the results of the two methods is less than 0.05 and the rate of change I is less than 4.5. Therefore, the calculation results of the landslide stability coefficient calculated by the transfer coefficient method and the Janbu method are both reasonable and the results of the two methods are relatively conservative. Janbu method is used to analyze the influence of three engineering parameters on landslide stability: bulk density of sliding soil, cohesive force of sliding zone soil and angle of internal friction: the bulk density of sliding soil is negatively related to the stability coefficient, and the cohesive force of sliding zone soil is negative. The internal friction angle is positively correlated with the stability coefficient, and the landslide stability coefficient is the most sensitive to the variation of the internal friction angle of the sliding zone soil. Furthermore, the influence of engineering parameters on landslide stability is analyzed. Under earthquake, the general trend of the influence of engineering parameters on landslide stability is not changed, but the influence degree is reduced by a small margin. Using the finite element method, three kinds of actual seismic waves are inputted, and the stability of the three landslides under the action of small earthquake, moderate earthquake and large earthquake is calculated and analyzed. The seismic response calculation method is equivalent linearization method, and the stability calculation method is finite element stress method. The time history curve of landslide stability coefficient under earthquake action is obtained. The results of analysis and calculation show that the time when the landslide stability coefficient is the smallest is not the moment when the seismic wave acceleration is the largest, and the selection of seismic wave has a great influence on the seismic stability analysis result: under the different earthquake action, The original stable landslide has different degrees of instability phenomenon. Finally, the advantages and disadvantages of several landslide seismic stability calculation methods are compared and analyzed, and some suggestions for seismic stability evaluation are put forward for three types of landslide with grade 鈪，

本文編號(hào)：1909948