發(fā)布時間：2018-04-26 05:12

  本文選題：土石壩 + 拋石擠淤　； 參考：《山東大學》2014年碩士論文

【摘要】：目前,大壩除險加固在我國水利工程建設(shè)事業(yè)中占居重要地位,因為我國在六十年代建設(shè)的大部分水利工程已出現(xiàn)嚴重的老化現(xiàn)象。對于砂礫石壩基上的土石壩,地震情況下大多存在著砂土層地震液化問題。 壩前淤積物是水庫經(jīng)過多年運行的產(chǎn)物,大多含水量高,細粘粒含量大,屬于流塑狀態(tài)的淤泥,人工或機械清淤難度大,費用高,尤其施工工期長。為了尋求一種更經(jīng)濟更合理的清淤方式,我們結(jié)合跋山水庫大壩除險加固工程,對土石壩拋石擠淤加固技術(shù)進行了深入的探討和研究。 具體研究內(nèi)容如下：(1)壩前淤積物的物理力學性質(zhì)及特點分析；(2)“拋石擠淤”最小荷載計算理論與研究；(3)拋石擠淤壓重體的設(shè)計計算方法。 到目前為止,跋山水庫大壩加固后投入蓄水運行多年,且經(jīng)過了較大洪水的考驗,實踐證明“拋石擠淤”技術(shù)是十分成功的。與“清淤壓重”方案相比,不僅為工程節(jié)省直接費用89.36萬元,減少水庫放水量650萬方,還縮短工期60天,使大壩在施工期間安全渡汛得到了保障�？傊�,該成果經(jīng)濟效益和社會效益十分顯著,具有廣闊的應(yīng)用前景和極大的推廣價值。 近年來壩腳拋石擠淤被廣泛地應(yīng)用于大壩加固工程中,這也是解決砂礫石壩基地震液化、提高壩坡抗滑穩(wěn)定性的常用措施之一。
[Abstract]:At present, dam reinforcement plays an important role in the construction of water conservancy projects in our country, because most of the water conservancy projects constructed in the sixties of our country have appeared serious aging phenomenon. For the earth-rock dam on the foundation of sand and gravel dam, the seismic liquefaction of sand layer is mostly existed in the case of earthquake. The silt in front of dam is the product of reservoir operation for many years, most of which have high water content and large content of fine clay, which belong to fluid-plastic state. It is difficult to clear silt artificially or mechanically, and the cost is high, especially the construction period is long. In order to find a more economical and reasonable way to clear the silt, we have made a deep discussion and study on the reinforcement technology of the earth and rock dam by blasting and squeezing the silt in combination with the project of removing danger and strengthening the dam of Bashan reservoir. The concrete research contents are as follows: (1) physical and mechanical properties and characteristics of the silt in front of the dam; (2) the theory of minimum load calculation of the "riprap extrusion silt" and the study on the design and calculation method of the silt compaction gravity body. Up to now, the dam of Bashan Reservoir has been put into operation for many years after reinforcement, and has passed the test of large flood. The practice has proved that the technology of "riprap and silt squeezing" is very successful. Compared with the "desilting and pressing weight" scheme, the project not only saves 893600 yuan in direct cost, reduces the discharge capacity of the reservoir by 6.5 million square meters, but also shortens the construction period of 60 days, which ensures the safety of the dam during the construction period. In a word, the economic and social benefits of this achievement are very remarkable, and it has broad application prospect and great popularizing value. In recent years, rockripping and silting at dam feet have been widely used in dam reinforcement projects, which is also one of the commonly used measures to solve the earthquake liquefaction of sand gravel dam foundation and to improve the stability of dam slope against sliding.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV641;TV698.23

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本文編號：1804625