本文選題：幸福溝 + 泥石流　； 參考：《成都理工大學》2015年碩士論文

【摘要】：幸福溝為一典型溝谷型泥石流溝,地質(zhì)歷史時期曾發(fā)生過多期次規(guī)模巨大的泥石流。5.12地震后,溝域內(nèi)產(chǎn)生了大量崩滑物源,并先后于2008年、2013年發(fā)生過兩次大規(guī)模泥石流,其可能在近期再次發(fā)生大規(guī)模的泥石流,嚴重威脅到溝內(nèi)大熊貓研究保護中心、大熊貓野生訓養(yǎng)場及溝口耿達鄉(xiāng)居民、S303省道的安全。因此,研究幸福溝泥石流的發(fā)育特征、運動特征及發(fā)展趨勢,對指導泥石流防治工程設(shè)計,具有一定的實際意義。本論文在幸福溝地質(zhì)地貌條件及泥石流發(fā)育特征系統(tǒng)調(diào)研基礎(chǔ)上,研究幸福溝泥石流形成條件、古泥石流歷史演化成因及震后泥石流活動性,并用CFX軟件模擬“7.10”泥石流及P=1%暴雨頻率下泥石流在溝道內(nèi)的運動情況,在此基礎(chǔ)上預測泥石流的發(fā)展趨勢,提出泥石流的治理工程建議。取得了如下主要認識:(1)幸福溝是一條流域面積大,支溝發(fā)育的泥石流溝�！�5.1”地震后,溝內(nèi)新增大量的崩滑物源,現(xiàn)溝內(nèi)物源總儲量約1377.32×104m3,動儲量約114.80×104m3,在遇大暴雨時,易形成支溝甚至主溝泥石流。(2)幸福溝為一老泥石流溝,地質(zhì)歷史時期至少發(fā)生過5期規(guī)模巨大泥石流,各期泥石流堆積體呈扇套扇堆積。根據(jù)古泥石流的發(fā)育特征,推測其古泥石流活動經(jīng)歷了從活躍到間歇5次循環(huán),而活躍期內(nèi)又暴發(fā)多次泥石流。古泥石流堆積物以巖漿巖為主,據(jù)此,推測其物源來源于主溝道左岸的巖漿巖分布區(qū),為茂汶斷裂發(fā)生的5次大震級古地震產(chǎn)生。(3)幸福溝現(xiàn)代泥石流規(guī)模相對古泥石流較小,其發(fā)育特征與古泥石流具有一定的相似性�！�5.12”地震前,泥石流不活躍,僅在1964年6月及1992年7月暴發(fā)過兩次泥石流;震后,泥石流進入活躍期,先后于2008年6月和2013年7月暴發(fā)過兩次規(guī)模較大的泥石流,由震前低頻泥石流轉(zhuǎn)變?yōu)楦哳l泥石流,規(guī)模也增大。震后,主溝泥石流為稀性泥石流,主要在溝內(nèi)相對寬緩處及溝道口堆積,但由于主溝溝道口堆積范圍較小,其堆積扇不發(fā)育;支溝泥石流多偏粘性泥石流,主要在各支溝溝口堆積,部分進入主溝內(nèi)堆積。(4)用計算流體力學軟件CFX對幸福溝中下游溝段及三條較大支溝下游溝段進行了數(shù)值模擬,模擬得到了“7.10”泥石流的速度場、對溝床的剪應力場及壓應力場,與采用泥痕調(diào)查法計算的“7.10”泥石流速度吻合度較高。因而,P=1%暴雨頻率下泥石流的模擬結(jié)果,能夠為泥石流防治工程設(shè)計提供一定參考。(5)在幸福溝古泥石流歷史演化成因及現(xiàn)代泥石流發(fā)育特征基礎(chǔ)上,結(jié)合定量計算,推測,震后幸福溝泥石流激發(fā)雨量下降了約2/3,未來10年其泥石流活動仍然活躍,支溝較主溝更易暴發(fā)泥石流。在前期降雨量充足的前提下,當日降雨量達到105mm時,可激發(fā)100年一遇泥石流,規(guī)模約15.08×104m3。通過定性分析及對經(jīng)驗公式進行修正后的定量計算,可知當幸福溝暴發(fā)100年一遇的泥石流時,其造成漁子溪的完全堵斷可能性較大。最后,對幸福溝泥石流采取攔擋、排導、生物工程相結(jié)合的綜合治理措施。
[Abstract]:The happy gully is a typical valley type debris flow gully. After a large number of massive debris flow.5.12 earthquakes in the geological historical period, a large number of landslides have been produced in the gully area. In 2008, two large-scale debris flows occurred in 2013, which may have occurred again in the near future with large-scale debris flow, which seriously threatens the big bear in the ditch. The research and protection center of the cat, the giant panda Wild training farm and the residents of the gully gundun Township, the safety of the S303 provincial road. Therefore, it is of certain practical significance to study the development characteristics of the debris flow in the happy gully, the characteristics of the movement and the trend of development, which is of practical significance to the design of the debris flow prevention and control engineering. On the basis of the survey, the formation conditions of debris flow in the happy gully, the historical evolution of the ancient debris flow and the activity of the debris flow after the earthquake are studied, and the movement of debris flow in the gully under the "7.10" debris flow and the P=1% rainstorm frequency is simulated with CFX software. On this basis, the development trend of debris flow is predicted and the proposal of the debris flow management project is proposed. The following main understanding are as follows: (1) the gully is a debris flow gully with large basin area and branch ditch development. After the "5.1" earthquake, a large number of landslides and slippery sources are added in the ditch. The total reserves in the furrow are about 1377.32 * 104m3, and the dynamic reserves are about 114.80 * 104m3. In the event of heavy rain, it is easy to form a branch ditch even the main ditch debris flow. (2) the happy gully is an old debris flow. In the gully, there were at least 5 huge debris flows in the geological historical period, and the debris flow deposits in each period were fan sets. According to the characteristics of the paleo debris flow, the ancient debris flow activity experienced from active to intermittent 5 cycles. Its source is derived from the magmatic rock distribution area on the left bank of the main channel, which is the 5 magnitude ancient earthquake of the Maowen fault. (3) the scale of modern debris flow in the happy gully is relatively smaller than the ancient debris flow, and its development features are similar to that of the ancient debris flow. Before the "5.12" earthquake, the mud and stone flow was inactive, only in June 1964 and July 1992. After two debris flows, after the earthquake, the debris flow entered the active period, and two large debris flows were outburst in June 2008 and July 2013. The low frequency debris flow before the earthquake was transformed into high frequency debris flow, and the size of the debris flow was also enlarged. After the earthquake, the debris flow in the main ditch was a RRL debris flow, mainly in the relative width and the gully gully in the gully, but the main ditch was caused by the main ditch. The accumulation area of the crossing is small, and the accumulation fan is not developed; the mudflow of the mudflow in the branch ditch is mostly viscous debris flow, which mainly accumulates in the gully and gully of each branch. (4) the numerical simulation of the middle and lower reaches of the happy gully and the lower reaches of the three larger branches is carried out by the computational fluid dynamics software CFX, and the speed of the "7.10" debris flow is simulated. The shear stress field and stress field of the trench bed are in good agreement with the "7.10" debris flow velocity calculated by the mud mark investigation method. Therefore, the simulation results of debris flow under the P=1% rainstorm frequency can provide some reference for the design of debris flow prevention and control engineering. (5) the historical evolution cause of the ancient debris flow and the development of the modern debris flow in the happy gully. On the basis of the quantitative calculation, it is inferred that the rainfall in the happiness gully debris flow after the earthquake is about 2/3, and the debris flow activity is still active in the next 10 years, and the branch gully is more prone to the mud and stone flow than the main ditch. Under the precondition of sufficient rainfall, the debris flow can be excited for 100 years when the rainfall is reached, and the scale is about 15.08 x 104m3.. The analysis of sexual analysis and the revised quantitative calculation of the empirical formula show that when the happy gully erupts 100 years of debris flow, the possibility of completely blocking the Fishing Creek is more likely. Finally, the comprehensive treatment measures of blocking, guiding and bioengineering are taken to the debris flow of the happy gully.
【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】：P642.23

【參考文獻】

相關(guān)期刊論文 前2條

1 陳春光,姚令侃,禹華謙;泥石流與水流場交匯耦合分析的MAC法[J];山地學報;2001年02期

2 程尊蘭,朱平一,劉雷激;泥石流活動與雨強的關(guān)系——以雅礱江下游金龍溝為例[J];自然災害學報;1998年02期

，

本文編號：2051912