本文選題：基覆型邊坡　切入點(diǎn)：動(dòng)力特性　出處：《西南交通大學(xué)》2014年博士論文

【摘要】：地震作用下邊坡的動(dòng)力穩(wěn)定性分析涉及到工程地質(zhì)學(xué)、巖土力學(xué)、地球物理學(xué)、地震工程學(xué)等多個(gè)學(xué)科的交叉,難度較大,目前仍存在很多亟待突破的問(wèn)題,而我國(guó)西部特殊的地理?xiàng)l件和地震構(gòu)造活動(dòng)決定了邊坡地震穩(wěn)定性問(wèn)題在該地區(qū)尤為突出。目前,我國(guó)的公路、鐵路、水利等基礎(chǔ)設(shè)施建設(shè)正處于高速發(fā)展時(shí)期,這就對(duì)邊坡工程的穩(wěn)定性判識(shí)和滑坡的危害性評(píng)價(jià)提出了更高的要求,以致現(xiàn)有的理論尚不能很好地滿(mǎn)足這一需求。因此,開(kāi)展邊坡地震穩(wěn)定性分析研究對(duì)降低地震滑坡災(zāi)害,給山區(qū)人民創(chuàng)造一個(gè)良好的生存環(huán)境,保障大型巖土工程設(shè)施的安全正常運(yùn)營(yíng)具有重要的意義：本論文在簡(jiǎn)要回顧邊坡地震穩(wěn)定性問(wèn)題的研究歷史與現(xiàn)狀的基礎(chǔ)上,以汶川地震為大背景,針對(duì)現(xiàn)階段存在的相關(guān)科學(xué)問(wèn)題,以地震作用下邊坡的動(dòng)力特性為主線(xiàn),以現(xiàn)場(chǎng)調(diào)查、地震臺(tái)陣實(shí)測(cè)數(shù)據(jù)、振動(dòng)臺(tái)試驗(yàn)、數(shù)值分析及理論分析為手段,探明地震作用下巖質(zhì)邊坡的動(dòng)力特性,并在此基礎(chǔ)上,以地震中破壞最為嚴(yán)重的基覆型邊坡(本文定義：基覆型邊坡是指表面分布一定厚度或范圍覆蓋層的巖質(zhì)邊坡,而由基覆型邊坡滑塌所形成的滑坡稱(chēng)為基覆型滑坡)為研究對(duì)象,深入剖析基覆型邊坡發(fā)生滑塌的成因機(jī)制,提出一套能夠考慮地震動(dòng)三要素(幅值、頻率、持時(shí))影響的基覆型邊坡地震穩(wěn)定性分析方法和預(yù)測(cè)地震誘發(fā)基覆型滑坡危害范圍的評(píng)價(jià)體系。為此,本文主要完成以下研究工作：1.借助大型振動(dòng)臺(tái)試驗(yàn)、數(shù)值模擬及現(xiàn)場(chǎng)地震臺(tái)陣的監(jiān)測(cè)結(jié)果,研究了坡面角度、地震烈度、地震波輸入類(lèi)型、坡體類(lèi)型以及局部坡體形態(tài)等因素對(duì)巖質(zhì)邊坡動(dòng)力特性的影響,在上述研究成果的基礎(chǔ)上,利用彈性波動(dòng)理論推導(dǎo)了能夠充分考慮地震波特性(持時(shí)、頻率計(jì)幅值)的雙面巖質(zhì)邊坡地震動(dòng)響應(yīng)的理論解,從理論計(jì)算的角度量化的揭示了地震作用下巖質(zhì)邊坡的動(dòng)力特性。2.基于巖質(zhì)邊坡動(dòng)力特性的研究成果,以基覆型邊坡為研究對(duì)象,概化分析模型,借助新型時(shí)間-頻率-幅值分析技術(shù),結(jié)合振動(dòng)臺(tái)試驗(yàn)研究成果和數(shù)值分析結(jié)果,從時(shí)域、時(shí)頻聯(lián)合域兩個(gè)方面系統(tǒng)的開(kāi)展了地震作用下基覆型邊坡的變形特征和滑塌成因機(jī)制的研究。3.隨著對(duì)邊坡動(dòng)力穩(wěn)定性問(wèn)題研究的深入,已普遍認(rèn)識(shí)到應(yīng)用擬靜力法進(jìn)行邊坡地震穩(wěn)定性評(píng)價(jià)所存在的不足,邊坡地震穩(wěn)定性的時(shí)頻分析方法已成為邊坡工程抗震設(shè)計(jì)發(fā)展的趨勢(shì)。本文基于彈性波動(dòng)理論,概化地質(zhì)分析模型,利用Hilbert-Huang變換,借助地震作用下基覆型邊坡的變形特征和滑塌成因機(jī)制的研究成果,提出了基覆型邊坡地震穩(wěn)定性的時(shí)頻分析方法,并且通過(guò)振動(dòng)臺(tái)試驗(yàn)和數(shù)值分析結(jié)果對(duì)其合理性進(jìn)行了驗(yàn)證。4.長(zhǎng)期以來(lái),滑坡危害范圍的預(yù)測(cè)模型中僅僅考慮了滑坡體積(V)、滑坡的最大垂直滑動(dòng)距離(H)兩個(gè)影響因素。然而,大量的研究成果表明,峰值地震動(dòng)加速度、山體坡面的坡度等因素與滑坡分布、規(guī)模具有較好的相關(guān)性。因此,本文基于汶川地震滑坡災(zāi)害的調(diào)查結(jié)果,重點(diǎn)整理、分析了破壞最為嚴(yán)重的基覆型滑坡的災(zāi)害情況,利用地震動(dòng)峰值加速度的衰減模型,建立了能夠考慮山高HL、坡度θ、地震動(dòng)峰值PGA以及滑塌體積V等因素影響的汶川地震誘發(fā)基覆型滑坡災(zāi)害危害范圍的預(yù)測(cè)模型。
[Abstract]:The analysis relates to the engineering geology of slope dynamic stability under earthquake, rock and soil mechanics, geophysics, cross disciplines, such as difficulty in earthquake engineering, there are still many problems to be a breakthrough, while China's western special geographical conditions and seismic tectonic activity determines that the problem is particularly prominent in the seismic stability of slope area. At present, China's highway, railway, water conservancy and other infrastructure construction is in a period of rapid development, the stability of slope in the identification and landslide hazard evaluation put forward higher requirements, so that the existing theory cannot satisfy this demand. Therefore, to carry out research on reducing seismic landslide hazard analysis of slope seismic stability, to create a good living environment for the people in the mountainous areas, has an important significance to ensure the normal operation and safety of geotechnical engineering facilities: Based on a brief review of research history and status quo of slope seismic stability on the Wenchuan earthquake as the background, according to the relevant scientific problems, the dynamic characteristic of the slope under earthquake as the main line, to the scene investigation, seismic array data, shaking table test, numerical analysis and theoretical analysis it means, dynamic characteristics of rock slope under earthquake, and on this basis, the earthquake damage is the most serious type of bedrock slope (defined in this paper: base cover type refers to the slope rock slope, the surface distribution of a certain thickness range or cover layer and the base cover type slope collapse formed the landslide is called overburden landslide) as the research object, in-depth analysis of the formation mechanism of landslide occurrence overburden slope, put forward a set of ground motion can be considered three factors (amplitude, frequency, duration) of seismic slope stability influence of the base cover type Analysis and prediction of earthquake induced landslide hazards based cover range evaluation system. Therefore, this paper mainly completed the following research work: 1. through shaking table test, numerical simulation and field seismic array monitoring results of slope angle, seismic intensity, seismic wave input type, the influence of slope type and local slope the body shape and other factors on the dynamic characteristics of rock slope, based on the above results, using the theory of elastic wave is able to fully consider the characteristics of seismic waves (duration, frequency amplitude) double slope seismic response theory, from the theoretical calculation of angle quantization reveals that under the action of earthquake rock slope dynamic characteristics research of.2. dynamical properties of rock slope based on the base cover slope as the research object, generalized analysis model, with the help of new time - frequency - amplitude analysis technology, With shaking table test results and numerical analysis results, from the time domain, time-frequency domain two aspects of the system to carry out the deformation characteristics of bedrock slope under earthquake and landslide formation mechanism of.3. with the research of dynamic stability of slope depth, is generally recognized that insufficient application of pseudo static method exists to evaluate the seismic stability of slope, the time-frequency analysis method of slope seismic stability of slope engineering seismic design has become a development trend. This paper based on the elastic wave theory, geological analysis model, using Hilbert-Huang transform, research by means of the deformation characteristics of bedrock slope under earthquake and landslide formation mechanism, put forward when the frequency stability of the base cover type slope seismic analysis method, and through the shaking table test and numerical analysis results verified the rationality of.4. for a long time, slip The prediction model of slope hazard scope only considers the landslide volume (V), the maximum vertical sliding distance of landslide (H) two factors. However, a large number of research results show that the peak ground acceleration, slope factor and landslide distribution of mountain slope, there is good correlation scale. Therefore, the investigation results in this paper the landslide in Wenchuan earthquake, based on the analysis of the key arrangement, the disaster situation serious landslide and bedrock for destruction, the attenuation model of seismic peak acceleration using the established to consider the mountain slope HL, theta, prediction model range of hazards induced by Wenchuan earthquake landslide disasters and bedrock peak ground collapse and PGA the volume of V and other factors.

【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：P642.22;TU435

【引證文獻(xiàn)】

相關(guān)會(huì)議論文 前1條

1 唐春安;左宇軍;秦泗鳳;楊菊英;王大國(guó);李連崇;徐濤;;汶川地震中的邊坡淺層碎裂與拋射模式及其動(dòng)力學(xué)解釋[A];汶川大地震工程震害調(diào)查分析與研究[C];2009年

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本文編號(hào)：1716873