簡(jiǎn)布條分法和畢肖普法的改進(jìn)及在實(shí)際中的應(yīng)用
本文選題:穩(wěn)定計(jì)算 + 新的本構(gòu)模型; 參考:《湖北工業(yè)大學(xué)》2017年碩士論文
【摘要】:目前,滑坡、泥石流等自然災(zāi)害的逐年增加,嚴(yán)重威脅著人們的生命和財(cái)產(chǎn)安全。因此,對(duì)滑坡的研究及其穩(wěn)定性的研究越來(lái)越受學(xué)者們的關(guān)注。而傳統(tǒng)的簡(jiǎn)化bishop法、Janbu法、傳遞系數(shù)法等極限平衡法存在幾個(gè)問(wèn)題:首先,假設(shè)了滑體為剛體,沒(méi)有考慮變形;第二,穩(wěn)定系數(shù)定義欠妥;第三,這些方法均采用并不嚴(yán)謹(jǐn)?shù)膹?qiáng)度折減法。研究人員迫切希望提出一種簡(jiǎn)單精確的分析方法,能同時(shí)克服以上問(wèn)題。盧應(yīng)發(fā)教授在此基礎(chǔ)上提出了滑坡穩(wěn)定計(jì)算新系統(tǒng)(包括:新型節(jié)理本構(gòu)模型、新型穩(wěn)定系數(shù)計(jì)算方法、新型條分法和新型有限元計(jì)算方法-滑面邊界法),本文作者在讀研期間,接觸了眾多滑坡,通過(guò)查閱詳細(xì)資料,認(rèn)真研讀理論知識(shí),對(duì)向家坡進(jìn)行了詳細(xì)計(jì)算和分析。本文基于此系統(tǒng)主要從以下幾個(gè)方面著手進(jìn)行研究。第一,系統(tǒng)介紹了目前的滑坡穩(wěn)定性分析方法,分別介紹分析了它們的假設(shè)條件、具體步驟、適用條件、優(yōu)缺點(diǎn)等,F(xiàn)行方法可以說(shuō)是“經(jīng)驗(yàn)法”,并在工程中積累了一定經(jīng)驗(yàn)。第二,本文引入盧應(yīng)發(fā)教授所提出的新的本構(gòu)模型,并且對(duì)新的本構(gòu)模型的基本方程、參數(shù)的決定、臨界狀態(tài)分析進(jìn)行了詳細(xì)介紹。另外,闡述了目前滑坡的穩(wěn)定系數(shù)計(jì)算方法,且提出了在傳統(tǒng)方法上的改進(jìn)方法,以及在本構(gòu)模型上提出的新型定義方法,并詳細(xì)介紹了在此基礎(chǔ)上的綜合下滑力—抗滑力法(CSRM)、主推力法(MTM)、綜合位移法(CDM)和富余位移法(RDM),同時(shí)根據(jù)計(jì)算出的結(jié)果,詳細(xì)的對(duì)向家坡滑坡的變形機(jī)理、破壞特征進(jìn)行了分析。第三,本文分別用傳統(tǒng)的穩(wěn)定性計(jì)算方法和新的本構(gòu)模型對(duì)向家坡進(jìn)行計(jì)算,并采用成熟有限元軟件GEO-SLOPE模擬分析該滑坡變形與受力,通過(guò)比較得出:新型計(jì)算方法同樣適用于滑坡計(jì)算,而且更貼近于工程實(shí)際。最后,本文在盧教授提出的滑面邊界法的基礎(chǔ)上,利用新型條分法對(duì)向家坡編制了相關(guān)程序,通過(guò)介紹了實(shí)施背景、實(shí)施方法和實(shí)施步驟,同樣證明新的本構(gòu)同樣可以適用于有限元,而且相比傳統(tǒng)的有限元,克服了不收斂問(wèn)題。
[Abstract]:At present, landslide, debris flow and other natural disasters are increasing year by year, which seriously threaten people's life and property safety. Therefore, more and more scholars pay attention to the study of landslide and its stability. However, there are several problems in the traditional bishop method, such as the Janbu method and the transfer coefficient method. Firstly, the sliding body is assumed to be a rigid body without considering the deformation; second, the definition of the stability coefficient is not well defined; and the third, the stability coefficient is not properly defined. These methods are not rigorous strength reduction method. Researchers are eager to propose a simple and accurate analysis method that can overcome these problems at the same time. On this basis, Professor Lu Yingfa put forward a new system for the calculation of landslide stability (including: a new constitutive model of joints, a new method for calculating stability coefficient, A new type of strip method and a new finite element method, sliding surface boundary method, are used to calculate and analyze Xiangjiapu in detail by consulting detailed data and studying theoretical knowledge. Based on this system, this paper mainly studies from the following aspects. First, the present landslide stability analysis methods are systematically introduced, their hypothetical conditions, concrete steps, applicable conditions, advantages and disadvantages are analyzed respectively. The present method can be described as "empirical method" and has accumulated some experience in engineering. Secondly, a new constitutive model proposed by Professor Lu Yingfa is introduced in this paper, and the basic equation, parameter determination and critical state analysis of the new constitutive model are introduced in detail. In addition, the calculation method of landslide stability coefficient is expounded, and the improved method in traditional method and the new definition method in constitutive model are put forward. On the basis of this, the comprehensive sliding force anti-slip force method (CSRMU), the main push force method (MTM), the integrated displacement method (CDM) and the surplus displacement method (RDMN) are introduced in detail. The deformation mechanism and failure characteristics of Xiangjiapo landslide are analyzed in detail according to the calculated results. Thirdly, the traditional stability calculation method and the new constitutive model are used to calculate the slope of Xiangjiao, and the deformation and force of the landslide are simulated and analyzed by using the mature finite element software GEO-SLOPE. Through comparison, it is concluded that the new calculation method is also suitable for landslide calculation and is closer to engineering practice. Finally, on the basis of the sliding surface boundary method proposed by Professor Lu, this paper makes use of the new stripe method to compile the relevant program for Xiangjiapo, and introduces the background, the method and the steps of the implementation. It is also proved that the new constitutive model can also be applied to finite element method, and the problem of nonconvergence is overcome compared with the traditional finite element method.
【學(xué)位授予單位】:湖北工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:P642.22
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