本文選題：地震作用　切入點(diǎn)：雙面坡　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：我國位于世界兩大地震帶之間,地震頻仍,而西部山區(qū)恰恰與地震帶相重合,地震引起的山體滑坡對(duì)該地區(qū)的生命財(cái)產(chǎn)安全造成重大威脅,往往是地震次生災(zāi)害中危害性最大的一種。因此,研究掌握邊坡在地震作用下的破壞規(guī)律具有重大的現(xiàn)實(shí)意義。本文依托西南交通大學(xué)振動(dòng)臺(tái)系統(tǒng),在前人研究的基礎(chǔ)上,針對(duì)邊坡的變形破壞過程、破壞模式、破壞機(jī)理及其動(dòng)力響應(yīng)規(guī)律進(jìn)行了初步的研究,設(shè)計(jì)并完成了五組不同條件邊坡的大型振動(dòng)臺(tái)試驗(yàn),主要探討了地震動(dòng)參數(shù)及土體巖土力學(xué)性質(zhì)對(duì)邊坡動(dòng)力穩(wěn)定性的影響。通過對(duì)試驗(yàn)影像資料及傳感器采集的大量數(shù)據(jù)進(jìn)行分析,主要得出了以下幾點(diǎn)結(jié)論:(1)土體含水率及壓實(shí)度對(duì)邊坡的破壞模式影響顯著,對(duì)邊坡動(dòng)力響應(yīng)規(guī)律具有一定程度影響。(2)五組邊坡的破壞模式分別為淺表潰滑型、拉剪-潰滑型、潰散型、蠕滑型以及潰崩型。邊坡表面的位移變化曲線可以從一定程度上反映邊坡破壞模式的部分信息,有助于揭示邊坡的破壞規(guī)律。(3)本試驗(yàn)條件下,坡面及坡內(nèi)測(cè)點(diǎn)加速度放大系數(shù)呈現(xiàn)出明顯的高程放大效應(yīng),但沿水平方向測(cè)點(diǎn)加速度放大系數(shù)并未表現(xiàn)出趨表放大的特點(diǎn)。邊坡加速度放大效應(yīng)與輸入波幅值之間的關(guān)系受邊坡含水率影響。隨輸入波頻率增加(趨于邊坡自振頻率),邊坡各測(cè)點(diǎn)加速度放大系數(shù)呈現(xiàn)出增大的趨勢(shì)。邊坡對(duì)低頻正弦波的動(dòng)力響應(yīng)不明顯。(4)本文的結(jié)果很好地驗(yàn)證了地震作用下雙面坡的初動(dòng)拉剪加速破裂效應(yīng)、重復(fù)拉剪效應(yīng)以及雙坡共剪效應(yīng),對(duì)進(jìn)一步揭示地震作用下雙面坡的破壞機(jī)理具有一定意義。
[Abstract]:China is located between the two major earthquake zones in the world. Earthquakes are frequent, and the western mountainous area coincides with the seismic belt. The landslides caused by earthquakes pose a major threat to the safety of life and property in this area. Therefore, it is of great practical significance to study and master the failure law of slope under earthquake. This paper relies on the shaking table system of Southwest Jiaotong University, based on the previous research. According to the deformation and failure process, failure mode, failure mechanism and dynamic response of slope, five groups of large-scale shaking table tests of slope with different conditions are designed and completed. This paper mainly discusses the influence of ground motion parameters and the mechanical properties of soil and soil on the dynamic stability of slope. Through the analysis of the experimental image data and a large number of data collected by the sensor, the dynamic stability of the slope is analyzed. The main conclusions are as follows: (1) soil moisture content and compaction have a significant effect on the failure mode of the slope, and have a certain degree of influence on the dynamic response of the slope. The failure modes of the five groups of slopes are shallow-surface collapsing and shear-collapsing, respectively. The displacement curve of slope surface can reflect some information of slope failure mode to some extent, which is helpful to reveal the failure rule of slope. The acceleration magnification factor of the slope surface and the test point inside the slope shows obvious elevation amplification effect. However, the acceleration magnification factor of the measured point along the horizontal direction does not show the characteristic of tendency amplification. The relation between the acceleration amplification effect of slope and the amplitude of input wave is affected by the water content of the slope, and the frequency of the input wave increases (tends to the slope). The dynamic response of slope to low frequency sine wave is not obvious. The repeated tension-shear effect and the double-slope co-shear effect have certain significance for further revealing the failure mechanism of the double-sided slope under earthquake action.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU435

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