本文選題：井溝泥石流 + 基本特征��； 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：城鎮(zhèn)建設(shè)中泥石流危害正在引起公眾、媒體和工程地質(zhì)界的重視。對基本特征及動力學(xué)特征機理的探索,具有重要的理論意義及現(xiàn)實價值。以陜西省吳堡縣宋家川鎮(zhèn)井溝泥石流為研究對象,基于實際勘查數(shù)據(jù),借助于數(shù)學(xué)、力學(xué)、計算機等理論與技術(shù),進行泥石流運動過程中狀態(tài)、接觸力、速度及位移情況研究,得到三點結(jié)論:(1)分析得到井溝泥石流的主要特征:①吳堡縣井溝泥石流活動微弱,發(fā)生頻率低較,規(guī)模大,暴發(fā)頻率約十年一次。②流域平面形態(tài)呈長條樹枝形,泥石流的三區(qū)各具特征:形成區(qū)“大而緩”,流通區(qū)“短且窄”、堆積區(qū)“平而廣”。③綜合分析得到井溝泥石流重度14.5kN/m3;流速1.19-4.28m/s;流量5.6m3/s-20.61m3/s;一次最大沖出量0.4×104m3-1.5×104m3;一次泥石流沖出固體物質(zhì)總量0.17×104m3-6.4×104m3;單塊巨石的撞擊力為22.4kPa-80.5kPa;整體沖擊壓力11.9kPa-42.8kPa;最大沖起高度為0.31m-1.11m;爬高 0.49m-1.78m,彎道超高 0.43m-1.53m。(2)分析了井溝泥石流形成機制:初期以重力侵蝕作用為主、中后期以水力侵蝕作用為主。在降雨的條件下,棄渣壩體逐步達到飽和狀態(tài),在自身重力作用下,水和固體物質(zhì)發(fā)生運動,二者匯流后形成初期泥石流。隨著暴雨的持續(xù),棄渣壩殘留的固體物質(zhì)及溝床內(nèi)固體物質(zhì)持續(xù)受水動力的片蝕和侵蝕,使固體物質(zhì)不斷參與泥石流,同時溝道兩側(cè)谷坡上的不穩(wěn)定物源也受暴雨沖刷等方式失穩(wěn)進入溝道,加劇泥石流的規(guī)模。(3)利用顆粒流(PFC2D)數(shù)值模擬分析井溝泥石流動力學(xué)特征。結(jié)合泥石流流域、動力特征,對井溝泥石流運動過程進行模擬,再現(xiàn)井溝泥石流運動狀態(tài)、接觸力、速度及位移。分析顆粒沖出最大速度、位移曲線圖。根據(jù)實際情況預(yù)測,井溝泥石流的最大沖淤距離可達2693m,到達吳堡縣城幼兒園附近。
[Abstract]:Debris flow hazards in urban construction are attracting the attention of the public, media and engineering geology.It is of great theoretical significance and practical value to explore the basic characteristics and the mechanism of dynamic characteristics.Taking the well gully debris flow in Songjiaguan Town, Wubao County, Shaanxi Province as the research object, based on the actual exploration data and with the help of mathematics, mechanics, computer and other theories and techniques, the state, contact force, velocity and displacement of debris flow in the course of the debris flow movement are studied.The main characteristics of mud-rock flow in Wubao county, Wubao county, were analyzed. The debris flow activity was weak, the frequency of debris flow was lower and the scale was large. The outbreak frequency was about once in ten years, and the plane shape of the basin was in the shape of long branches.Each of the three zones of debris flow has its own characteristics: the forming area is "large and slow", and the circulation area is "short and narrow".The comprehensive analysis of "flat and wide" .3 shows that the debris flow in the well gully is 14.5 KN / m3; the velocity is 1.19-4.28 m / s; the flow rate is 5.6 m3 / s; the maximum flow volume is 0.4 脳 104m3-1.5 脳 104m3; the total amount of solid material washed out by a debris flow is 0.17 脳 104m3-6.4 脳 104m3; the impact force of a monolithic boulder is 22.4kPa-80.5 kPa; the whole impact pressure is 11.9kPa-42.8kPa.The formation mechanism of mud-rock flow in the well gully is analyzed: gravity erosion is the main action in the initial stage, and the height is 0.31m-1.11m; the climbing height is 0.49m-1.78m; and the bend is ultra-high 0.43m-1.53m.In the middle and late stage, hydraulic erosion is the main action.Under the condition of rainfall, the abandoned slag dam body gradually reaches saturation state. Under the action of its own gravity, the water and solid matter move, and the debris flow is formed in the initial stage after the confluence of the two bodies.With the continuous torrential rain, the residual solid matter in the abandoned slag dam and the solid material in the ditch bed are continuously eroded and eroded by the hydrodynamic force, which makes the solid material participate in the debris flow continuously.At the same time, the unstable material source on the valley slope on both sides of the channel is also unstable into the channel by torrential rain, which intensifies the scale of debris flow, and uses particle flow PFC2D) to simulate and analyze the dynamic characteristics of well gully debris flow.Combined with the dynamic characteristics of debris flow basin, the movement process of well gully debris flow is simulated, and the movement state, contact force, velocity and displacement of well ditch debris flow are reproduced.The maximum velocity and displacement curve of particles are analyzed.According to the actual situation, the maximum erosion and siltation distance of mud-rock flow can reach 2693 m and reach near the kindergarten of Wubao county.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P642.23

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