發(fā)布時間：2018-04-30 05:44

  本文選題：隱伏斷裂 + 地震滑坡地貌��； 參考：《成都理工大學》2015年碩士論文

【摘要】：大光包巨型滑坡作為汶川地震最大的滑坡,其邊界條件、形成機制、運動特征、構(gòu)造背景、滑坡動力學響應(yīng)等一直是研究者最為關(guān)心的問題。文章從多個方面入手,著重對研究區(qū)滑坡發(fā)育規(guī)律和演化特征以及大光包滑坡滑帶特征和滑坡動力學響應(yīng)機理等進行研究:從形成滑坡的邊界斷裂入手,對滑坡區(qū)構(gòu)造演化過程提出總體認識;通過地震地貌的研究,從等時性和穿時性兩個方面,總結(jié)出研究區(qū)地震滑坡的發(fā)育規(guī)律及其對黃洞子溝右岸支溝地形地貌演化的“貢獻”;層內(nèi)錯動帶對比分析和成因機制研究讓我們對滑帶巖體有了進一步認識;滑帶和滑面巖體在地震滑坡形成過程中的損傷變形甚至變質(zhì)作用為大型高速遠程滑坡的研究提供了借鑒:沿滑坡后壁發(fā)育的四合天井斷裂為汶川地震發(fā)震斷裂北西側(cè)的隱伏斷裂,該斷層在大光包巨型滑坡形成的前期為滑坡邊界的形成提供了有利條件,滑坡區(qū)斷裂做為隱伏斷裂端部,其所積累的巨大應(yīng)力可能為滑坡初始運動提供動力的同時與層內(nèi)錯動帶一起對滑坡規(guī)模起到控制作用�；趯ρ芯繀^(qū)內(nèi)汶川地震崩滑體的詳細調(diào)查發(fā)現(xiàn):黃洞子溝右岸(大光包滑坡、老鷹巖滑坡、紅石溝滑坡所在一側(cè))由汶川地震觸發(fā)的崩、滑體數(shù)量和規(guī)模較之左岸大很多;通過典型剖面對比進一步發(fā)現(xiàn)研究區(qū)內(nèi)地震地貌原地復(fù)發(fā)的證據(jù)(斷層崩積楔);文章結(jié)合區(qū)內(nèi)實例,采用將今論古的方法,推斷出黃洞子溝右岸支溝演化與多期次的古地震滑坡事件相關(guān);該研究說明古地震滑坡多期次原地復(fù)發(fā)對滑源區(qū)地貌演化有著重要意義,與此同時對闡明龍門山地區(qū)乃至其他地震多發(fā)區(qū)地形地貌的演化發(fā)展有著舉足輕重的作用。大光包巨型滑坡滑帶特征方面:將層內(nèi)錯動帶典型剖面從上到下分為:碎裂巖層、粉質(zhì)層、錯動分異層、粘土層等四層,并針對對各個層位巖體成分、結(jié)構(gòu)、發(fā)育部位等特征進行了較為詳細是分層描述;針對性的將大光包滑坡的滑帶成因模式分為相互穿插的五個過程;從宏觀上來講,錯動面下部巖體距離錯動面越近其錯動程度越高,巖石越破碎;從微觀角度看,離錯動面越近錯動程度越高的巖體其原生沉積結(jié)構(gòu)保留越差,取而代之的則是碎裂化越發(fā)育。文章獨創(chuàng)性的將滑坡動力學響應(yīng)過程中新形成的巖石或礦物命名為滑坡生成巖,并結(jié)合多個實例對滑坡生成巖進行系統(tǒng)闡述。大光包巨型滑坡為具有典型高速遠程特征的深層滑坡,其具備形成滑坡生成巖的內(nèi)在和外在條件:滑體厚度巨大,且滑體在運動初期并未發(fā)生大規(guī)模解體,使得滑體在運動時滑面附近有著巨大的壓力;滑帶巖體為震旦系燈影組白云巖,而碳酸鹽巖恰為較易發(fā)生變質(zhì)的巖石,在200到300攝氏度的溫度和一定的壓力條件下即可讓其發(fā)生變質(zhì)。文章將大光包滑坡滑帶巖體和粘土質(zhì)成分在不發(fā)生熔融而形成的一般性滑坡變質(zhì)巖與前人對滑坡�；瘞r和滑帶變質(zhì)礦物或滑帶巖體重新膠結(jié)形成滑坡角礫巖進行對比研究,形成了滑坡生成巖(礦物)體系。采用垂向?qū)Ρ�、橫向?qū)Ρ�、縱向?qū)Ρ认嘟Y(jié)合的方式對大光包滑坡變質(zhì)巖進行研究發(fā)現(xiàn):滑面發(fā)生變質(zhì)的部位其下部巖體也會不同程度變質(zhì),且變質(zhì)程度隨著離滑面距離的增大而減弱直到一定深度變質(zhì)現(xiàn)象完全消失;橫向?qū)Ρ蕊@示,滑面高高程處巖體變質(zhì)程度最低,中高程處巖體變質(zhì)程度最高,低高程處巖體變質(zhì)程度中等的現(xiàn)象,說明該高程區(qū)域在滑坡過程中所受溫、壓條件并不是按照理論值同等變化的。大光包滑坡變質(zhì)巖沿滑坡方向(縱向)發(fā)育特征表現(xiàn)為:從滑坡后緣到滑坡前緣,滑面巖體變質(zhì)程度越來越高。
[Abstract]:As the largest landslide in Wenchuan earthquake, the great Guang Bao landslide has been the most concerned problem for the researchers. In this paper, the development regularity and evolution characteristics of landslides in the study area, the characteristics of landslide belt and landslide movement in the great light packet and the landslide movement are discussed in this paper. The mechanical response mechanism is studied. Starting with the formation of the boundary fault of the landslide, the overall understanding of the tectonic evolution process of the landslide area is put forward, and the development law of the Seismic Landslides in the study area and the "contribution" to the landform and geomorphology evolution of the right bank of the yellow cave ditch are summed up from the two aspects of the isochronous and the timing of the seismic geomorphology. The contrastive analysis of the interlayer dislocation and the study of the genetic mechanism let us have a further understanding of the rock mass. The damage deformation and even metamorphism of the sliding and slippery rock masses in the formation of the Seismic Landslides provides a reference for the large and high speed long distance landslides. The four closing well fracture along the back wall of the landslide is a seismogenic fault in Wenchuan. The hidden fault in the north west side provides favorable conditions for the formation of the landslide boundary in the early stage of the great Guang Bao Mega landslide. The landslide zone fault is the end of the hidden fault. The accumulated huge stress may provide power for the initial landslide movement and control the scale of the landslide with the inner fault zone. The detailed investigation of Wenchuan earthquake avalanche in the study area has found that the number and scale of the slide body triggered by the Wenchuan earthquake is much larger than that on the left bank, which is triggered by the Wenchuan earthquake on the right bank of the Huangdong Zi gully (Dapu landslide, the Lao Ying rock landslide and the side of the Hongshi gully landslide). In combination with an example in the area, the article deduces that the evolution of the right bank branch gully evolution in the Yellow Dong Zi gully is related to the multi period paleoseismic landslide, which shows that the recurrence of the ancient earthquake landslides is of great significance to the landform evolution in the skid source area, and it also illustrates the Longmen mountain area and the other earthquakes at the same time. The evolution and development of topography and geomorphology in the development area have played an important role. In the aspect of the great Guang Bao landslide belt, the typical section of the inner fault zone is divided into four layers, such as fractured rock layer, silty layer, fault differentiation layer, clay layer and so on. The stratified description is divided into five processes in which the sliding zone of the great light packet landslide is divided into each other. From the macro point of view, the closer to the dislocation surface, the higher the fault movement and the more fractured rock, and from the micro point of view, the worse the rock mass with the higher the error moving range is, the worse the reservation of the primary sedimentary structure. The new rock or mineral formed in the process of the dynamic response of the landslide is named landslide generation rock, and the landslide generation rock is systematically expounded in combination with several examples. The huge landslide is a deep landslide with typical high speed and remote characteristics, which has the formation of landslide generation rock. The internal and external conditions are: the thickness of the slide body is huge and the slide body does not disintegrate in a large scale at the beginning of movement, which makes the sliding body have great pressure near the sliding surface, and the slide rock is the dolomite in the Sinian Dengying group, and the carbonate rocks are just the more prone to metamorphic rocks at 200 to 300 degrees Celsius and a certain pressure bar. In this paper, the general landslide metamorphic rocks, which are formed in the absence of melting, have been contrasted with the predecessors to form landslide breccia by cementing landslide vitrified rock, sliding belt metamorphic mineral or slide rock mass, and forming a landslide formation rock (mineral) system. The vertical contrast, lateral contrast and longitudinal contrast are combined to study the metamorphic rock of Da Guang Bao landslide. It is found that the lower rock mass of the metamorphic part of the sliding surface will also deteriorate in varying degrees, and the degree of metamorphism weakens with the distance from the sliding surface to a certain depth to a certain depth, and the lateral contrast shows that the sliding surface is high. The rock metamorphism of the rock mass is the lowest, the rock metamorphic degree at the middle elevation is the highest and the rock metamorphic degree of the low elevation is moderate, which indicates that the temperature of the elevation area is not the same as the theoretical value. The development characteristics of the Da Guang Bao landslide along the landslide direction (longitudinal) are manifested in the back edge of the landslide to the landslide. In the front of the landslide, the metamorphic degree of the sliding surface rock is getting higher and higher.

【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P642.22

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本文編號：1823359