本文關(guān)鍵詞： 滑坡 穩(wěn)定性 新型節(jié)理本構(gòu)模型 GEO-SLOPE　出處：《湖北工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：現(xiàn)今,在人類對大自然的開發(fā)和利用過程中,由于最初的設(shè)計和后續(xù)的施工不當(dāng),形成了大量的人工邊坡,這些邊坡有部分處于人口密集區(qū),一旦出現(xiàn)滑坡等災(zāi)害,極有可能引起重大的財產(chǎn)損耗。同時我國是一個山區(qū)較多的國家,占國土面積三分之二以上的都是山地,在部分省份,幾乎全省都處于山區(qū),這就形成了各種各樣數(shù)量眾多的自然邊坡。無論自然邊坡還是人工邊坡都可能引起非常嚴(yán)重的后果。因此,加強(qiáng)滑坡災(zāi)害的研究,尤其是對滑坡穩(wěn)定性開展研究,具有重要的現(xiàn)實意義和巨大的社會、經(jīng)濟(jì)效益。本文作者讀研期間有幸參與了三峽庫區(qū)地質(zhì)災(zāi)害防治項目和恩施土家族苗族自治州的邊坡治理項目,現(xiàn)場接觸了眾多的滑坡,同時也看到了滑坡帶來的危害,這些危害促使作者對滑坡穩(wěn)定性開展研究。本文對現(xiàn)今滑坡穩(wěn)定性計算運用最多的極限平衡分析法和有限元法對比研究,分析了這兩類方法在使用中存在的優(yōu)缺點,在此基礎(chǔ)上總結(jié)出現(xiàn)有滑坡穩(wěn)定計算方法存在的最主要的幾個問題:首先,滑面采用理想彈塑性模型,未考慮滑面真實應(yīng)力應(yīng)變;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;最后,在傳統(tǒng)邊坡穩(wěn)定分析中,多數(shù)采用極限平衡條分法,極限平衡條分法均是建立在極限平衡狀態(tài)(極限平衡狀態(tài)是指:可能的滑動面均達(dá)到臨界狀態(tài),也即是峰值應(yīng)力狀態(tài))之上,實質(zhì)假定了整個滑面同時處于臨界狀態(tài),也即是:邊坡在破壞時,滑面是同時或幾乎同時發(fā)生破壞。為了解決這些問題,獲取滑坡更加真實的穩(wěn)定性,本文作者在對盧應(yīng)發(fā)教授及其團(tuán)隊所提出的新本構(gòu)模型基礎(chǔ)上,結(jié)合傳統(tǒng)Morgenstern-Price法,提出了一種廣義Morgenstern-Price法穩(wěn)定系數(shù)定義法。該方法引入盧應(yīng)發(fā)教授的新型節(jié)理本構(gòu)模型,同時詳細(xì)介紹了該模型的參數(shù)標(biāo)定方法。本文作者利用傳統(tǒng)極限平衡法、新條分法對五里坡滑坡具體實例進(jìn)行安全系數(shù)計算,對比研究各個方法計算結(jié)果,探究廣義Morgenstern-Price法的合理性和優(yōu)越性。并采用成熟有限元軟件GEO-SLOPE模擬計算五里坡滑坡穩(wěn)定系數(shù)。計算結(jié)果表明:廣義Morgenstern-Price法理論完善,計算方法快捷方便,計算結(jié)果合理,數(shù)值模擬效果較好。
[Abstract]:Nowadays, in the process of human exploitation and utilization of nature, due to the initial design and subsequent improper construction, a large number of artificial slopes have been formed, some of which are in densely populated areas. Once landslide and other disasters occur, it is very likely to cause significant property loss. At the same time, China is a mountainous country, accounting for more than 2/3 of the land area is mountainous, in some provinces. Almost all of the province is in the mountainous area, which forms a variety of numerous natural slopes, whether natural slopes or artificial slopes may cause very serious consequences. Therefore, the study of landslide disasters should be strengthened. Especially the study of landslide stability has important practical significance and huge society. The author was fortunate to participate in the three Gorges reservoir area geological disaster prevention and control project and the slope control project of Enshi Tujia and Miao autonomous prefecture during his study. At the same time, we also see the harm brought by landslide, which urges the author to study the landslide stability. In this paper, the limit equilibrium analysis method and finite element method are used to calculate the landslide stability. The advantages and disadvantages of these two methods in use are analyzed. On this basis, the main problems of landslide stability calculation method are summarized: first, the sliding surface adopts an ideal elastic-plastic model. The true stress and strain of sliding surface are not taken into account; Second, the definition of stability coefficient is not well defined; Third, these methods are not rigorous intensity reduction; Finally, in the traditional slope stability analysis, most use the limit equilibrium slice method, the limit equilibrium strip method is based on the limit equilibrium state (the limit equilibrium state means that the possible sliding surface reaches the critical state. Above the peak stress state, the whole sliding surface is assumed to be in critical state at the same time, that is, when the slope is destroyed, the sliding surface is destroyed at the same time or almost at the same time. In order to solve these problems. Based on the new constitutive model proposed by Professor Lu Ying-fa and his team, the author combines the traditional Morgenstern-Price method. A new method of defining the stability coefficient of the generalized Morgenstern-Price method is presented, which is introduced into Professor Lu Ying-fa 's new constitutive model of joints. At the same time, the parameter calibration method of the model is introduced in detail. The authors use the traditional limit equilibrium method and the new strip method to calculate the safety factor of the Wu#china_person0# landslide, and compare the results of each method. The rationality and superiority of the generalized Morgenstern-Price method are explored, and the stability coefficient of the Wu#china_person0# landslide is simulated by the mature finite element software GEO-SLOPE. The calculation results show that the stability coefficient of the Wu#china_person0# landslide is calculated. :. The theory of generalized Morgenstern-Price method is perfect. The calculation method is quick and convenient, the calculation result is reasonable, and the numerical simulation effect is better.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P642.22

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