發(fā)布時間：2018-06-01 04:30

  本文選題：三峽庫區(qū) + 豐都�。� 參考：《成都理工大學》2016年碩士論文

【摘要】：三峽庫區(qū)是滑坡多發(fā)區(qū),隨著水庫蓄水,庫區(qū)內大量老滑坡產生不同程度的變形復活。提高庫水位日降幅勢必對滑坡穩(wěn)定性造成更大影響,所以開展此項研究很有必要。研究區(qū)位于重慶市豐都縣,距離三峽大壩434km,庫段全長49km,區(qū)內水庫滑坡分布廣泛,對生命財產造成巨大威脅,其中代表性的較大滑坡共有36處。提高庫水位日降幅破壞了滑坡原有的平衡狀態(tài),有可能導致滑坡復活。在保證滑坡穩(wěn)定性的前提下提高庫水位日降幅,既不會導致災害的發(fā)生,又能提高水庫經濟效益,因此,研究庫水位下降速率對區(qū)內滑坡穩(wěn)定性的影響具有重要的實際意義。本文以三峽庫區(qū)豐都段水庫滑坡作為研究對象,在充分分析了研究區(qū)地質環(huán)境條件、滑坡發(fā)育特征基礎上,對研究區(qū)滑坡的發(fā)育規(guī)律進行了詳細研究,并對滑坡進行分類,研究了滑坡穩(wěn)定性影響因素及變形機理。最后利用定性評價和定量評價綜合分析了研究區(qū)滑坡穩(wěn)定性現(xiàn)狀以及增大庫水位日降幅條件下穩(wěn)定性預測。經過上文研究,得到如下成果:(1)研究區(qū)滑坡發(fā)育在J2s、J3s、J3p地層中,巖性主要為砂巖、泥巖,可分為三類工程地質巖組:Ⅰ、堅硬厚層狀砂巖為主;Ⅱ、軟硬相間層狀砂巖、粘土巖互層;Ⅲ以軟弱層狀粘土巖為主�；伦冃文Ｊ街饕獮槿浠�-拉裂式、滑移-拉裂式,少量為滑移-彎曲式。(2)對研究區(qū)滑坡按照工程地質巖組進行統(tǒng)計可以得出:Ⅰ類巖組發(fā)育滑坡8處,Ⅱ類巖組發(fā)育滑坡13處,Ⅲ類巖組發(fā)育滑坡15處。不同工程地質巖組中發(fā)育的滑坡堆積體物質組成也存在差異,對應于工程巖組分類,將堆積體分為三類:Ⅰ、前緣大塊石+中部、后部粉質粘土夾碎塊石;Ⅱ、粉質粘土夾碎塊石+前緣坡表堆積砂巖塊石;Ⅲ、粉質粘土為主,夾泥巖碎塊石。(3)對區(qū)內滑坡按照庫水作用劃分為三類:(1)動水壓力型,共發(fā)育23處;(2)浮托減重型,共發(fā)育3處;(3)復合型,共發(fā)育10處。(4)對滑坡穩(wěn)定性影響因素進行研究,利用Geo Studio軟件對不同因素影響下的滑坡滲流特征進行數值模擬,根據模擬結果并結合變形實例分別分析了不同類型滑坡的變形破壞的發(fā)育特征及變形機理。(5)建立定性評價方法以及定量評價方法,對前緣高程低于159m的動水壓力型滑坡和復合型滑坡,利用定性評價和定量評價相結合的方法進行穩(wěn)定性評價;對于前緣高程高于159m的滑坡以及浮托減重型滑坡,僅用定性評價方法進行穩(wěn)定性評價。(6)以沙田滑坡為典型滑坡,進行綜合評價。利用Geo Studio軟件對沙田滑坡現(xiàn)有條件下以及增加庫水位日降幅條件下的穩(wěn)定性進行模擬分析,通過分析可知:沙田滑坡在庫水位下降過程中由于坡體內外平衡被打破,產生滲流場變化以及應力重分布,導致在前緣消落帶附近形成位移集中區(qū),另外由于降雨作用導致滑坡后部陡坎處也出現(xiàn)位移集中區(qū),變形破壞局部發(fā)育,不影響滑坡整體穩(wěn)定性,所以沙田滑坡在現(xiàn)狀條件下以及增加庫水位日降幅條件下均處于整體基本穩(wěn)定狀態(tài)。(7)利用上述方法對研究區(qū)其他35處滑坡進行穩(wěn)定性評價,從計算結果可以看出,在現(xiàn)狀條件下區(qū)內滑坡共27處處于整體穩(wěn)定狀態(tài),7處處于整體基本穩(wěn)定狀態(tài),2處由于前緣強烈變形處于整體基本穩(wěn)定局部欠穩(wěn)定狀態(tài)。在增加庫水位日降幅條件下,共計14處滑坡穩(wěn)定性有所降低,統(tǒng)計發(fā)現(xiàn)15處滑坡處于整體穩(wěn)定狀態(tài),18處處于基本穩(wěn)定狀態(tài),2處處于整體基本穩(wěn)定局部欠穩(wěn)定狀態(tài),1處處于整體基本穩(wěn)定局部不穩(wěn)定狀態(tài)。
[Abstract]:The Three Gorges Reservoir area is a landslide area. With the reservoir storage, a large number of old landslides in the reservoir area are resurrected by different degrees of deformation. Increasing the daily decline of the reservoir water level will have a greater impact on the stability of the landslide. Therefore, it is necessary to carry out this study. The research area is located in the Fengdu County of Chongqing, the 434km of the Three Gorges Dam, the full length of 49km in the reservoir section, and the reservoir in the region. The landslide is widely distributed and poses a great threat to life and property, and there are 36 major landslides in its representative. Increasing the diurnal decline of the reservoir water level destroys the original balance state of the landslide and may lead to the resurrection of the landslides. The increase of the daily decline of the reservoir water level on the premise of ensuring the stability of the landslide will not cause the occurrence of the disaster, but also the reservoir can be improved. Therefore, it is of great practical significance to study the influence of the decline rate of the reservoir water level on the stability of the landslides in the area. In this paper, the Fengdu section of the Three Gorges Reservoir area is taken as the research object. On the basis of the geological environment conditions and the characteristics of the landslide development, the development law of the landslide in the study area is studied in detail, and the development law of the landslide is studied in detail. This paper classifies the landslides and studies the influencing factors and deformation mechanism of landslide stability. Finally, qualitative evaluation and quantitative evaluation are used to synthetically analyze the status of landslide stability and the stability prediction under the condition of increasing the diurnal decline of reservoir water level. After the previous study, the following results are obtained: (1) the landslides in the study area are developed in J2s, J3s, J3p strata, Lithology is mainly sandstone and mudstone, which can be divided into three types of engineering geological rock groups: I, hard and thick layered sandstone mainly; II, soft and hard layered sandstone, clay rock interbedding, and soft layered clay rock. The landslide deformation mode is mainly creep slip and crack type, slip and crack type, a little slip bending type. (2) landslides in the study area are in accordance with engineering field. According to the statistics of the rock group, there are 8 landslides in type I rock group, 13 landslides in class II rock group and 15 landslides in class III rock group, and there are also differences in the material composition of the landslides developed in different engineering geological groups. Corresponding to the classification of engineering rock groups, the accumulation bodies are divided into three categories: I. Soil clip rock block stone; II, silty clay fragment stone + front slope table accumulated Sawa Shi; III, silty clay mainly, mudstone fragment stone. (3) the landslides in the area are divided into three categories according to the effect of reservoir water: (1) the dynamic water pressure type, the total development of 23 places; (2) floating relief, 3; (3) composite type, altogether 10. (4) on the stability of landslide stability factors The characteristics of landslide seepage under the influence of different factors are simulated by Geo Studio software. The development characteristics and deformation mechanism of different types of landslides are analyzed according to the simulation results and combined with the deformation cases. (5) the qualitative evaluation method is established and the quantitative evaluation method is established, and the height of the front edge is lower than that of 159M. The stability evaluation of dynamic water pressure landslides and compound landslides with qualitative evaluation and quantitative evaluation is carried out by qualitative evaluation and quantitative evaluation. Stability evaluation is carried out only by qualitative evaluation method. (6) comprehensive evaluation is carried out by using Sha Tin landslide as a typical landslide. (6) Geo Studio software is used. The stability of Sha Tian landslide under the existing conditions and the daily decline of the reservoir water level is simulated and analyzed. Through the analysis, it can be seen that, in the process of the decline of the reservoir water level, the landslide caused the change of the seepage field and the stress redistribution, resulting in the formation of the displacement concentration area near the front edge of the falling zone. The rainfall effect leads to the displacement concentration area in the steep ridge of the back of the landslide, and the deformation damage is partially developed and does not affect the overall stability of the landslide. Therefore, the Shatin landslide is in the whole basic stable state under the condition of the present condition and the increase of the diurnal decline of the reservoir water level. (7) the stability evaluation of the other 35 landslides in the study area is carried out by the above method. According to the calculation results, we can see that 27 landslides in the present condition are in the whole stable state, 7 are in the whole basic stable state, and the 2 places are in the whole basic stable partial stable state because of the strong deformation of the front edge. Under the condition of increasing the diurnal decline of the reservoir water level, the stability of the 14 landslides is reduced, and 15 statistics are found. The landslide is in the whole stable state, 18 places are in the basic stable state, 2 are in the whole basic stable local under stable state, and 1 are in the whole stable and local unstable state.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：P642.22

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