本文選題：滲流力 + ABAQUS子程序　； 參考：《武漢理工大學(xué)》2015年碩士論文

【摘要】：在巖土工程領(lǐng)域中,土體中的水對(duì)土體結(jié)構(gòu)性能有很大的影響,其中由土中水壓力產(chǎn)生的滲流力問題,是巖土工程領(lǐng)域的一個(gè)重要課題。對(duì)滲流問題的求解,傳統(tǒng)的解析法對(duì)復(fù)雜邊界條件下滲流力場(chǎng)的求解是件很困難的事,而實(shí)驗(yàn)法耗費(fèi)的時(shí)間長(zhǎng),資金大,且一般只能做縮尺實(shí)驗(yàn)。近年來,數(shù)值模擬的方法越來越廣泛地應(yīng)用于求解土體滲流問題當(dāng)中。ABAQUS有限元分析軟件由于其強(qiáng)大的非線性求解能力,在巖土工程中有著廣泛的應(yīng)用,該軟件能夠很好地模擬土體飽和-非飽和、穩(wěn)定-非穩(wěn)定滲流問題以及土體固結(jié)變形問題,但是在滲流力問題的處理上存在不足。通過運(yùn)用該軟件的子程序二次開發(fā)功能,以實(shí)現(xiàn)在土體結(jié)構(gòu)中的滲流力加載。本文以解決用有限元軟件模擬實(shí)際工程中滲流力的問題為出發(fā)點(diǎn),以滲流力的基本理論為基礎(chǔ),編制ABAQUS的URDFIL子程序命令,實(shí)現(xiàn)將滲流分析中得到的各網(wǎng)格單元的孔壓值轉(zhuǎn)換為各網(wǎng)格單元的平均滲流力值。滲流力基本概念[1]指在某路徑的沿程方向單位體積內(nèi)土顆粒受到的滲流作用力,本文中水平方向上滲流力即為孔壓沿水平方向的梯度值,在重力方向滲流力上,除了沿重力方向的孔壓梯度值,還考慮了單位體積內(nèi)孔隙水重力的作用。在得到各網(wǎng)格單元水平及豎向的滲流力值后,應(yīng)用DLOAD子程序?qū)B流力值加載于力學(xué)計(jì)算模型中對(duì)應(yīng)的單元,實(shí)現(xiàn)滲流力在有限元模擬中的加載。通過建立一個(gè)簡(jiǎn)單的一維滲流模型,根據(jù)其加載滲流力后的力學(xué)變形結(jié)果,證明該方法加載的滲流值與理論值相同;再建立另一簡(jiǎn)單的二維滲流模型,對(duì)比滲流加載方式的不同對(duì)計(jì)算結(jié)果的影響,證明當(dāng)采用面荷載代替滲流力時(shí),得到的計(jì)算結(jié)果位移偏大,應(yīng)力的分布更不均勻;最后將該方法應(yīng)用于東湖通道圍堰降水過程的數(shù)值計(jì)算中,對(duì)滲流力場(chǎng)的結(jié)果以及力學(xué)變形結(jié)果進(jìn)行了分析,得到了降水過程中滲流力分布的一般規(guī)律,進(jìn)一步證明了本文中提出的滲流力加載方法的有效性及準(zhǔn)確性。
[Abstract]:In the field of geotechnical engineering, water in soil has a great influence on the structure and performance of soil, and the seepage force caused by water pressure in soil is an important subject in geotechnical engineering. The traditional analytical method is very difficult to solve the seepage force field under complex boundary conditions, but the experimental method takes a long time and has a large amount of money, and it can only be used in scale experiments. In recent years, the numerical simulation method is more and more widely used in solving soil seepage problem. Abaqus finite element analysis software has been widely used in geotechnical engineering because of its strong nonlinear ability. The software can well simulate the saturated-unsaturated, stable-unstable seepage problems and soil consolidation and deformation problems, but there are some shortcomings in the treatment of seepage force problems. By using the secondary development function of the subroutine of the software, the seepage force loading in the soil structure can be realized. In order to solve the problem of simulating seepage force in practical engineering with finite element software and based on the basic theory of seepage force, the URDFIL subroutine command of ABAQUS is compiled in this paper. The pore pressure of each mesh element can be converted into the average seepage force value of each mesh element in seepage analysis. The basic concept of seepage force [1] refers to the seepage force acting on soil particles in the unit volume along a certain path. In this paper, the seepage force in the horizontal direction is the gradient value of the pore pressure along the horizontal direction and the seepage force in the gravity direction. In addition to the pore pressure gradient along the gravity direction, the effect of pore water gravity per unit volume is considered. After the horizontal and vertical seepage force values of each mesh element are obtained, the seepage force value is loaded into the corresponding element in the mechanical calculation model by DLOAD subroutine to realize the seepage force loading in the finite element simulation. By establishing a simple one-dimensional seepage model, according to the results of mechanical deformation after loading seepage force, it is proved that the seepage value loaded by this method is the same as the theoretical value, and another simple two-dimensional seepage model is established. Compared with the influence of different seepage loading modes on the calculation results, it is proved that when the seepage force is replaced by the surface load, the displacement of the calculated results is larger and the stress distribution is more uneven. Finally, the method is applied to the numerical calculation of the dewatering process in the cofferdam of the East Lake Channel. The results of the seepage force field and the mechanical deformation are analyzed, and the general law of the seepage force distribution in the process of precipitation is obtained. The validity and accuracy of the seepage force loading method proposed in this paper are further proved.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU43

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