本文選題：高陡巖質(zhì)邊坡 + 水位驟變　； 參考：《重慶大學(xué)》2015年碩士論文

【摘要】：我國(guó)西南地區(qū)水資源豐富,在水資源的開發(fā)利用過程中往往會(huì)遇到西南地區(qū)非常具有代表性的巖質(zhì)高邊坡問題。巖質(zhì)高邊坡是山區(qū)工程建設(shè)中的重要地質(zhì)環(huán)境和工程承載體,西南地區(qū)巖質(zhì)高邊坡具有邊坡高陡,坡型復(fù)雜,邊坡應(yīng)力量級(jí)高,具有復(fù)雜的變形破裂演化歷史等特點(diǎn)。而在涉及到高陡邊坡的水利水電工程中,水——巖石相互作用往往是誘發(fā)高陡巖質(zhì)邊坡失穩(wěn)的主要原因之一。本文首先采用單裂隙巖體模型對(duì)巖體在裂隙水作用下的等效彈性模量進(jìn)行了相關(guān)的公式推導(dǎo),并通過有限元數(shù)值計(jì)算對(duì)相關(guān)理論公式進(jìn)行了驗(yàn)證,同時(shí)與現(xiàn)有的傳統(tǒng)打折方法進(jìn)行了對(duì)比。通過數(shù)值分析,得到了邊界拉應(yīng)力作用下與滲流力作用下模型的等效彈性模量折減規(guī)律。將孔隙水壓力視作靜孔隙水壓力,滲流力和超孔隙水壓力三部分構(gòu)成,論述孔隙水壓力對(duì)巖體強(qiáng)度的影響。推導(dǎo)了靜孔隙水壓力對(duì)處于壓剪狀態(tài)及張剪狀態(tài)的巖體的折減強(qiáng)度公式。并且,將超孔隙水壓力的作用視作裂隙開展,超孔隙水壓的增加,裂隙尖端局部滲流力三部分的共同作用分別推導(dǎo)得出了三部分作用對(duì)強(qiáng)度的折減公式。利用推導(dǎo)獲得的公式及結(jié)論,將其應(yīng)用于對(duì)實(shí)際工程的有限元數(shù)值分析之中,實(shí)現(xiàn)了平面模型及三維模型中滲流場(chǎng)與應(yīng)力場(chǎng)的耦合,通過數(shù)值分析結(jié)果來探討水位驟然變化下,滲流場(chǎng)的變化規(guī)律以及對(duì)滲流場(chǎng)對(duì)邊坡穩(wěn)定性的影響。
[Abstract]:The southwest region of China is rich in water resources. In the process of exploitation and utilization of water resources, it is often met with the problem of high rock slope which is very representative in southwest China. High rock slope is an important geological environment and engineering carrier in the construction of mountainous area. The rock high slope in southwest China has the characteristics of high and steep slope, complex slope type, high slope force level and complicated history of deformation and fracture evolution. In water conservancy and hydropower projects involving high and steep slopes, the water-rock interaction is often one of the main reasons for inducing the instability of high steep rock slopes. In this paper, the equivalent elastic modulus of rock mass under the action of fissure water is deduced by using a single fractured rock mass model, and the relevant theoretical formulas are verified by finite element numerical calculation. At the same time with the existing traditional discount methods are compared. Through numerical analysis, the equivalent elastic modulus reduction law of the model under boundary tension stress and seepage force is obtained. The pore water pressure is regarded as static pore water pressure, seepage force and excess pore water pressure. The influence of pore water pressure on rock mass strength is discussed. The formulas for reducing the strength of rock mass in compression-shear state and tension-shear state by static pore water pressure are derived. Moreover, the effect of excess pore water pressure is regarded as the joint action of fracture, the increase of excess pore water pressure and the local seepage force at the crack tip. By using the derived formula and conclusion, it is applied to the finite element numerical analysis of practical engineering. The coupling of seepage field and stress field in plane model and three-dimensional model is realized, and the sudden change of water level is discussed through numerical analysis results. The variation of seepage field and the influence of seepage field on slope stability.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU457

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