云南洗石溝泥石流的顆粒流模型研究
發(fā)布時(shí)間：2018-11-24 09:23
【摘要】：本文的工作圍繞泥石流顆粒流模型的建立和分析展開,調(diào)查了洗石溝的概況,在泥石流堆積區(qū)實(shí)地取樣后帶回實(shí)驗(yàn)室進(jìn)行測(cè)試,得到了泥石流堆積物的物理特性與力學(xué)特性。 對(duì)比了目前各種泥石流數(shù)值模型的特點(diǎn),發(fā)現(xiàn)顆粒流模型能夠更好地還原泥石流的過程。依據(jù)顆粒流接觸力學(xué)模型選擇了恰當(dāng)?shù)慕佑|本構(gòu),同時(shí)結(jié)合試驗(yàn)結(jié)果計(jì)算出了當(dāng)?shù)氐膸r石碰撞回彈系數(shù)。根據(jù)所選擇的接觸本構(gòu)確定了的顆粒流細(xì)觀參數(shù),建立了PFC-2D的直剪試驗(yàn)?zāi)Ｐ团c巖石碰撞回彈模型,按照室內(nèi)試驗(yàn)結(jié)果與計(jì)算得到的巖石碰撞回彈系數(shù)對(duì)細(xì)觀參數(shù)進(jìn)行標(biāo)定。隨后在PFC-2D中建立了泥石流的顆粒流模型,使用Excel將泥石流坡道二維形態(tài)導(dǎo)入到PFC-2D中。使用HIST命令記錄檢測(cè)石塊的速度與位置變化趨勢(shì),使用LOGFILE命令記錄某一時(shí)刻所有顆粒的位置與速度,并給出了數(shù)據(jù)處理的方法。 首先依據(jù)泥石流形態(tài)變化進(jìn)行分析,從宏觀上看,泥石流可分為一個(gè)大的陣流與若干較小陣流,泥石流前端剛好進(jìn)入堆積區(qū)時(shí)整體的變化最為激烈,隨后運(yùn)動(dòng)逐漸衰減,發(fā)現(xiàn)泥石流趨于停止時(shí)堆積區(qū)固體物源呈穩(wěn)定角度堆積。然后分別基于監(jiān)測(cè)石塊的方法與類Largrange方法分析,結(jié)果基本一致。泥石流前端進(jìn)入堆積區(qū)能量減小后,其余部分泥石流也會(huì)受到影響。根據(jù)泥石流薩維奇數(shù)與溫度的分布可知,泥石流內(nèi)部流態(tài)較復(fù)雜,變遷十分突然,大都處于快速流與慢速流兩種極端狀態(tài)。運(yùn)動(dòng)中的泥石流前端運(yùn)動(dòng)較為激烈,顆粒碰撞頻繁、能量傳遞較大,碰撞作用占優(yōu)；處于中部的泥石流相對(duì)穩(wěn)定,慣性作用占優(yōu),碰撞與能量傳遞很少；尾部的泥石流則又處于激烈狀態(tài),與前端類似,碰撞作用占優(yōu)；堆積區(qū)的泥石流卻又較為穩(wěn)定,也是慣性作用占優(yōu)。
[Abstract]:This paper focuses on the establishment and analysis of debris flow model, investigates the general situation of rock washing ditch, takes samples from debris flow accumulation area and brings them back to the laboratory for testing, and obtains the physical and mechanical properties of debris flow deposits. The characteristics of various numerical models of debris flow are compared and it is found that the particle flow model can better reduce the process of debris flow. According to the contact mechanics model of particle flow, the proper contact constitutive model is selected, and the local rock collision resilience coefficient is calculated according to the experimental results. According to the selected contact constitutive parameters, the direct shear test model of PFC-2D and the rock collision springback model are established, and the mesoscopic parameters are calibrated according to the indoor test results and the calculated rock impact springback coefficient. Then the particle flow model of debris flow is established in PFC-2D, and the two-dimensional shape of debris flow ramp is introduced into PFC-2D by Excel. Using HIST command to record and detect the change trend of rock velocity and position, using LOGFILE command to record the position and velocity of all particles at a certain time, and the method of data processing is given. First of all, according to the morphological changes of debris flow, the debris flow can be divided into a large array flow and a number of smaller array flows. The overall change of debris flow is the most intense when the front end of the debris flow just enters the accumulation area, and then the motion gradually attenuates. It is found that the solid source of debris flow tends to stably accumulate at an angle when the debris flow tends to stop. Then the method based on monitoring stone and Largrange method are analyzed, and the results are basically consistent. When the energy of the front end of debris flow into the accumulation area decreases, the other part of debris flow will also be affected. According to the distribution of Savage number and temperature of debris flow, the internal flow state of debris flow is more complex, the transition is very sudden, most of them are in two extreme states of fast flow and slow flow. The debris flow in the middle of the debris flow is relatively stable, the inertial action is dominant, and the collision and energy transfer are very few, and the debris flow in the middle of the debris flow is relatively stable, with frequent particle collisions and large energy transfer. The debris flow in the tail is in a fierce state, similar to the front end, the collision is dominant, but the debris flow in the accumulation area is stable, and the inertial action is dominant.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P642.23
本文編號(hào)：2353126
[Abstract]:This paper focuses on the establishment and analysis of debris flow model, investigates the general situation of rock washing ditch, takes samples from debris flow accumulation area and brings them back to the laboratory for testing, and obtains the physical and mechanical properties of debris flow deposits. The characteristics of various numerical models of debris flow are compared and it is found that the particle flow model can better reduce the process of debris flow. According to the contact mechanics model of particle flow, the proper contact constitutive model is selected, and the local rock collision resilience coefficient is calculated according to the experimental results. According to the selected contact constitutive parameters, the direct shear test model of PFC-2D and the rock collision springback model are established, and the mesoscopic parameters are calibrated according to the indoor test results and the calculated rock impact springback coefficient. Then the particle flow model of debris flow is established in PFC-2D, and the two-dimensional shape of debris flow ramp is introduced into PFC-2D by Excel. Using HIST command to record and detect the change trend of rock velocity and position, using LOGFILE command to record the position and velocity of all particles at a certain time, and the method of data processing is given. First of all, according to the morphological changes of debris flow, the debris flow can be divided into a large array flow and a number of smaller array flows. The overall change of debris flow is the most intense when the front end of the debris flow just enters the accumulation area, and then the motion gradually attenuates. It is found that the solid source of debris flow tends to stably accumulate at an angle when the debris flow tends to stop. Then the method based on monitoring stone and Largrange method are analyzed, and the results are basically consistent. When the energy of the front end of debris flow into the accumulation area decreases, the other part of debris flow will also be affected. According to the distribution of Savage number and temperature of debris flow, the internal flow state of debris flow is more complex, the transition is very sudden, most of them are in two extreme states of fast flow and slow flow. The debris flow in the middle of the debris flow is relatively stable, the inertial action is dominant, and the collision and energy transfer are very few, and the debris flow in the middle of the debris flow is relatively stable, with frequent particle collisions and large energy transfer. The debris flow in the tail is in a fierce state, similar to the front end, the collision is dominant, but the debris flow in the accumulation area is stable, and the inertial action is dominant.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P642.23
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