本文選題：層狀巖體 + 失穩(wěn)機理　； 參考：《河北工程大學》2017年碩士論文

【摘要】：目前大多數(shù)工程建設(shè)都離不開邊坡工程,從房建的基坑工程到路橋的填挖方工程。邊坡工程直接影響著主體工程建設(shè),邊坡失穩(wěn)破壞不僅會帶來人員財產(chǎn)的損失,還會影響工程建設(shè)甚至導致停工,因此邊坡穩(wěn)定性評價工作有著重要的意義。為了合理的評價邊坡穩(wěn)定性,本文研究了層狀巖體的失穩(wěn)破壞形式,基于已有的分類綜合簡化,得到五種破壞形式。通過查閱相關(guān)文獻,研究了各類層狀巖體失穩(wěn)機理,對順向坡及反傾坡的失穩(wěn)機理進行了必要的分類闡述,對斜向坡失穩(wěn)機理進行了補充研究。在此基礎(chǔ)上,本文研究了層狀巖體失穩(wěn)判據(jù),結(jié)合文獻已有公式進行了補充說明,并對因簡化帶來的公式缺失進行了合理的公式補充。為了研究實例工程的邊坡影響,本文闡述了層狀巖體的失穩(wěn)影響因素,并分為兩類進行說明。為了提高強度折減有限元法的計算效率、預(yù)測及判斷層狀巖體邊坡的穩(wěn)定情況,本文引入突變理論。本文對突變理論進行簡要介紹并對初等模型勢函數(shù)進行推導后,最終選取尖點模型作為本文研究層狀巖體穩(wěn)定性評價的理論模型。同時本文基于已有研究進行了勢函數(shù)的構(gòu)建并逐步推導得到判別式。為了驗證突變理論對強度折減有限元法計算效率的提升及該方法在工程中的效果,本文依托某露天礦邊坡工程,分別利用傳統(tǒng)的強度折減有限元法及基于突變理論的有限元法對該邊坡進行分析,對比說明了后者不僅能夠正確的得到研究結(jié)果,還可以提高計算效率。同時,本研究還發(fā)現(xiàn)并驗證了突變理論得到的分析結(jié)果受彈性模量參數(shù)影響較小。為了探索突變理論對邊坡失穩(wěn)時間的預(yù)測,本文最后依托該工程的監(jiān)測數(shù)據(jù),進行了曲線擬合并得到誤差可接受的預(yù)測時間。
[Abstract]:At present, most projects are inseparable from slope engineering, from the foundation pit of house construction to the filling and excavation of road and bridge. Slope engineering directly affects the construction of the main project. The failure of slope instability will not only lead to the loss of personnel and property, but also will affect the construction of the project and even lead to the suspension of work, so the evaluation of slope stability is of great significance. In order to evaluate the slope stability reasonably, the failure forms of layered rock mass are studied in this paper. Based on the existing classification and comprehensive simplification, five failure forms are obtained. The instability mechanism of various layered rock masses is studied by referring to the relevant documents. The mechanism of instability of the forward slope and the reverse slope is expounded by the necessary classification, and the mechanism of the instability of the inclined slope is studied in addition. On this basis, the instability criterion of layered rock mass is studied in this paper, and the formula deficiency caused by simplification is supplemented with the existing formulas in the literature. In order to study the slope influence of practical engineering, this paper expounds the factors influencing the instability of layered rock mass, and it is divided into two categories to explain. In order to improve the calculation efficiency of strength reduction finite element method and to predict and judge the stability of layered rock slope, the catastrophe theory is introduced in this paper. In this paper, the catastrophe theory is briefly introduced and the potential function of the elementary model is deduced. Finally, the cusp model is selected as the theoretical model to study the stability evaluation of layered rock mass in this paper. At the same time, the potential function is constructed based on the previous research and the discriminant is derived step by step. In order to verify the effect of catastrophe theory on the calculation efficiency of strength reduction finite element method and the effect of this method in engineering, this paper relies on the slope engineering of a certain opencast mine. The traditional strength reduction finite element method and the catastrophe based finite element method are used to analyze the slope. The comparison shows that the latter can not only get the research results correctly, but also improve the calculation efficiency. At the same time, it is found that the analysis results obtained by the catastrophe theory are less affected by the elastic modulus parameters. In order to explore the prediction of slope instability time based on catastrophe theory, based on the monitoring data of the project, the curve fitting and merging are carried out to get the acceptable prediction time of the error.
【學位授予單位】：河北工程大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU457

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本文編號：2010396