本文選題：高填方　切入點：降雨　出處：《成都理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著西部現(xiàn)代化建設(shè)進程的不斷加快,受其不良地形地質(zhì)條件的影響,工程建設(shè)勢必大規(guī)�！吧钔诟咛睢�,使人工邊坡數(shù)量日益增多。加之當(dāng)前全球氣候變暖,各地極端天氣不斷惡化,各類邊坡失穩(wěn)問題屢見不鮮,造成了巨大的人員傷亡和經(jīng)濟損失。通過前人不斷的研究分析可知降雨入滲與邊坡失穩(wěn)現(xiàn)象密切相關(guān),降雨入滲不但造成巖土體抗剪強度直接降低,同時會使坡體中非飽和區(qū)及地下水水位線的動態(tài)變化,導(dǎo)致邊坡動、靜水壓力等發(fā)生改變,使邊坡朝著不穩(wěn)定方向發(fā)展。因此分析降雨入滲時邊坡飽和-非飽和滲流場及受飽和-非飽和滲流影響下的邊坡變形及穩(wěn)定性問題,具有重要的理論和實際意義。針對高填方邊坡,本文為了研究降雨對其變形的影響,在降雨入滲飽和-非飽滲流理論基礎(chǔ)上,對降雨入滲情況下攀枝花機場12#滑坡的滲流場特性進行了數(shù)值計算與理論分析,得出了在不同降雨條件下滲流場變化規(guī)律,同時在此基礎(chǔ)之上,用數(shù)值模擬方法對滑坡體的變形情況進行了分析研究。本文取得的主要研究成果如下:1.查明了攀枝花機場12#滑坡基本的工程地質(zhì)條件、水文地質(zhì)條件及滑坡變形特征,總結(jié)分析了滑坡的失穩(wěn)破壞機制。2.利用數(shù)值模擬對12#滑坡臨滑前的雨季及不同降雨形式下滲流場的變化情況進行了計算分析,得到坡體地下水位在降雨條件不同時的變化規(guī)律。(1)天然降雨條件下,由于雨季降雨入滲量不斷增加,導(dǎo)致地下水位也持續(xù)上升。當(dāng)降雨量最大時,地下水位增幅相應(yīng)也達到峰值。若降雨持續(xù)進行則導(dǎo)致地下水位始終維持較高值,使巖土體長期浸泡飽水,這對坡體穩(wěn)定性極為不利。(2)短歷時小降雨強度的降雨類型,由于其總的降雨量較小加之排泄及蒸發(fā)作用,對地下水位的變化影響不大。但若保持該降雨強度很長時間,使總降雨量達到一定大小,降雨強度小的雨型也可以使地下水位上升一定幅度。反之降雨強度較大時,由于入滲快且入滲量大,則地下水位受降雨影響變化劇烈且發(fā)生時間較早。(3)當(dāng)總降雨量相同時,不同降雨歷時對邊坡影響程度有差異,其中強降雨短歷時相較于弱降雨長歷時對邊坡地下水影響更顯著。(4)地下水位隨著降雨的不斷進行而逐漸升高,降雨結(jié)束后,上層雨水持續(xù)入滲加之周邊區(qū)域地下水匯集使地下水位不降反升直到穩(wěn)定為止。這一規(guī)律可以較好說明降雨型邊坡失穩(wěn)破壞滯后性的特點,同時對邊坡的水害治理具有一定的指導(dǎo)意義。(5)當(dāng)降雨強度不變時,隨著降雨歷時增加總降雨量則增加,地下水位也逐漸升高。針對間斷降雨,由于下次降雨時地下水位已經(jīng)開始下降,則同一降雨強度相同降雨總時間下,連續(xù)降雨較間斷降雨地下水位更高。3.應(yīng)用數(shù)值模擬方法分析了12#滑坡在各種降雨工況下的變形特征,得到降雨入滲條件下坡體的變形規(guī)律。(1)隨著雨季降雨入滲量不斷增加,沉降變形量越來越大。當(dāng)?shù)叵滤幻黠@升高時,變形量也增大,但增幅并非最大。由于高水位的持續(xù)維持,巖土體受飽水軟化效應(yīng)的影響強度參數(shù)明顯降低,沉降變形量達到最大值并導(dǎo)致邊坡“滯后”破壞。(2)當(dāng)降雨持續(xù)時間相同的情況下,坡體整體變形隨著降雨量的增加而加劇。因為隨著降雨強度增加,降雨入滲量變大,地下水位逐漸升高,非飽和區(qū)不斷縮小,后緣飽和土體越來越多,導(dǎo)致強度參數(shù)減小,變形增大,坡體穩(wěn)定性系數(shù)下降。(3)雨剛停時,地下水位由于“滯后性”仍然處于上升狀態(tài),飽和土體區(qū)域仍在擴大,沉降量繼續(xù)加大。一段時間后,地下水位雖有回落,導(dǎo)致沉降量雖緩慢下降,但由于土體儲水及軟化效應(yīng),其與初始值相比仍較大。(4)隨著降雨時間延長,剪應(yīng)變增量不斷增大,逐漸形成連續(xù)貫通的潛在滑動帶(面)。同等時長的間隔型降雨相對連續(xù)降雨,雖然其地下水位相對較低,但土體在地下水位不斷的動態(tài)變化中,基本處于飽和狀態(tài),則產(chǎn)生軟化效應(yīng),如果每次降雨間隔時間較短且雨強較大則更容易失穩(wěn)破壞。
[Abstract]:With the process of the construction of western modernization is accelerating, affected by the adverse geological conditions, engineering construction will be large-scale digging and filling, the artificial slope increasing. Combined with the global climate warming, extreme weather around the deteriorating, all kinds of problem of slope instability It is often seen. caused huge casualties, and economic losses. Through the study of predecessors continue the analysis of rainfall infiltration and slope instability is closely related to rainfall infiltration caused not only directly reduce the shear strength of rock and soil, and the dynamic change of unsaturated zone and groundwater level in the slope, the slope, the hydrostatic pressure change, the slope towards the unstable the direction of development. Therefore the analysis of rainfall infiltration slope saturated unsaturated seepage field and slope deformation and stability under saturated unsaturated seepage under the influence, has important The theoretical and practical significance. In view of the high embankment slope, in order to study the effect of rainfall on the deformation, the rainfall infiltration saturated unsaturated seepage theory, the rainfall infiltration seepage field characteristics of Panzhihua Airport 12# landslide are carried out under the condition of numerical calculations and theoretical analysis, obtained in different rainfall conditions of seepage the law field change, and on this basis, were analyzed by the method of numerical simulation for deformation of landslide. The main achievements of this dissertation are as follows: 1. to identify the Panzhihua Airport 12# landslide basic engineering geological conditions, hydrogeological conditions and deformation characteristics of landslide, summarizes and analyzes the failure mechanism of.2. by numerical simulation the changes of 12# landslide before the rainy season and rainfall under the form of seepage field are calculated and analyzed by the slope landslide, groundwater level in different rainfall conditions Change law. (1) under the conditions of natural rainfall, rainy season due to rainfall infiltration increasing, the groundwater level has continued to rise. When the maximum rainfall, groundwater level also increase the corresponding peak. If the rainfall continued is the groundwater level maintained higher values, the long-term immersion of rock and soil water saturation, the the slope stability is extremely unfavorable. (2) the small rainfall intensity of short duration rainfall type, because the total rainfall is small and excretion and evaporation, has little effect on the change of the underground water level. But if you keep the intensity of rainfall for a long time, the total rainfall reached a certain size, rain type rainfall intensity is also small the rise of ground water level to a certain extent. If the rainfall intensity is larger, due to infiltration and infiltration, the underground water level is affected by rainfall and dramatic changes occurred earlier. (3) when the total rainfall is the same, different down The rain lasted there are differences on the influence degree of the slope, rainfall with short duration compared to the weak rainfall of long duration effect on the slope of groundwater is more significant. (4) the underground water level and increased gradually with the continuous rainfall, rainfall after upper continuous rain infiltration with the surrounding regional groundwater collection of the underground water level does not fall until stable so far. This law can better explain the failure characteristics of hysteresis loss of rainfall slope, and has certain guiding significance in the control of water disaster on the slope. (5) when the rainfall intensity is constant, with the increase of total rainfall, rainfall duration increased, underground water level has gradually increased. For continuous rainfall, the rainfall next time the underground water level has started to decline, the same rainfall intensity under the same rainfall time, continuous rainfall is intermittent rainfall higher underground water level numerical simulation method to analyze the application of.3. # landslide in 12 The deformation characteristics of various rainfall condition, get the deformation regularity of rainfall infiltration slope. (1) with the rainy season rainfall infiltration volume increased, the settlement is more and more big. When the groundwater level was significantly increased when the deformation increases, but the increase is not the largest. Due to the high water continued to maintain a rock, the soil strength parameters affected by water saturated softening effect is significantly reduced, settlement amount reaches the maximum slope and lead lag damage. (2) when rainfall duration under the same condition, the slope deformation increases with the increase of rainfall. Because with the increase of rainfall intensity, rainfall infiltration quantity, underground the water level gradually increased, unsaturated zone shrinking, the trailing edge of saturated soil is more and more, resulting in decreased strength parameters, deformation increases, the slope stability coefficient decreases. (3) the rain stopped, the underground water level due to "lag" is still on L state, saturated soil region is still in the expansion, the settlement continued to increase. After a period of time, the underground water level has dropped, leading to the settlement of slow decline, but due to soil water storage and its softening effect, compared with the initial value is still large. (4) with rainfall time, shear strain increment increases and gradually formed the potential sliding continuous belt (surface). The same time interval of rainfall relative to continuous rainfall, while the underground water level is relatively low, but the soil in the constant dynamic change of groundwater level, basically saturated, produce soft effect, if every time interval of rainfall is relatively short and strong rain the larger are more prone to failure.

【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU43;P642.22

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本文編號：1584585