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  本文選題：層狀　切入點：反傾邊坡　出處：《長安大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：層狀邊坡在巖質(zhì)邊坡中較為常見,其主要巖石類型為沉積巖和變質(zhì)巖。層狀邊坡包括順傾向和反傾向邊坡,傳統(tǒng)觀念認(rèn)為反傾向邊坡較穩(wěn)定,然而秦巴山區(qū)出露巖層以古生界變質(zhì)巖為主,在安康—神河一帶,山體出露巖層主要為石英片巖、鈣質(zhì)板巖、砂質(zhì)千枚巖等,其巖體強度低、結(jié)構(gòu)破碎,從而該地區(qū)反傾向邊坡破壞時有發(fā)生。目前,此類邊坡的破壞模式、破壞機理的研究相對薄弱。工程實踐表明,反傾向邊坡一旦發(fā)生失穩(wěn)破壞,將產(chǎn)生嚴(yán)重的工程災(zāi)害。一般將層狀反傾向巖質(zhì)邊坡的破壞類型分為滑移和傾倒兩種基本模式,而根據(jù)現(xiàn)場調(diào)查及地質(zhì)勘查等手段,大多數(shù)反傾向巖質(zhì)邊坡的破壞模式無法判別為滑移或傾倒,且邊坡破壞形式復(fù)雜多變。因此,本文針對層狀反傾向邊坡失穩(wěn)問題開展研究,采用數(shù)值模擬和理論分析相結(jié)合的手段,分析其破壞模式,論證其破壞機理。本文采用基于巖體強度折減有限元模型,該模型考慮了巖石與結(jié)構(gòu)面屬性,也考慮了剪應(yīng)力屈服與拉應(yīng)力屈服;有限元計算以Phase2有限元軟件為平臺,以典型千枚巖反傾向邊坡為研究對象;對巖體進行了理想化假設(shè),即認(rèn)為邊坡巖體由層狀巖石和結(jié)構(gòu)面組成,巖體被結(jié)構(gòu)面均等分割,巖石是各向同性的均質(zhì)連續(xù)理想彈塑性體;模擬邊坡坡角、巖層傾角、邊坡高度等要素變化時反傾向邊坡破壞特征。通過研究建立了張拉破壞與彎拉破壞的判別標(biāo)準(zhǔn)及滑移破壞與傾倒破壞模式的判別標(biāo)準(zhǔn)。將層狀反傾向巖質(zhì)邊坡破壞模式總結(jié)為五種類型:滑移、面滑內(nèi)傾(坡面滑移——坡內(nèi)傾倒)、下滑上傾(下部滑移——上部傾倒)、傾倒、內(nèi)滑外傾(坡內(nèi)滑移——坡外傾倒),并根據(jù)破壞模式總結(jié)了防治指導(dǎo)建議。
[Abstract]:Layered slope is common in rock slope, and its main rock types are sedimentary rock and metamorphic rock. However, the exposed strata in Qinba Mountain area are mainly Paleozoic metamorphic rocks. In the area of Ankang-Shenhe, the exposed rocks of the mountain body are mainly quartz schist, calcareous slate, sand phyllite and so on. Their rock mass is low in strength and broken in structure. At present, the research on the failure mode and mechanism of this kind of slope is relatively weak. Serious engineering disasters will occur. Generally, the failure types of layered anti-inclined rock slopes can be divided into two basic modes: slip and toppling, and according to the methods of field investigation and geological exploration, Most of the failure modes of anti-inclined rock slopes can not be distinguished as sliding or toppling, and the failure forms of slopes are complex and changeable. Therefore, the instability of layered anti-inclined slopes is studied in this paper. In this paper, a finite element model based on strength reduction of rock mass is used to analyze its failure mode and demonstrate its failure mechanism by means of numerical simulation and theoretical analysis, which takes into account the properties of rock and structural plane. The shear stress yield and tensile stress yield are also considered, the finite element calculation is based on Phase2 finite element software, and the typical phyllite slope is taken as the research object. That is, the slope rock mass is composed of layered rock and structural plane, the rock mass is divided equally by the structural plane, the rock is isotropic and homogeneous continuous and ideal elastoplastic body, the slope angle of the slope is simulated, the slope angle, the slope angle, the slope angle, the slope angle, the slope angle, In this paper, the criterion of tensile failure and flexural failure and the criterion of slip failure and toppling failure mode are established by studying the characteristics of slope failure when slope height and other factors change. The layered reverse inclined rock slope is broken. Bad patterns are summed up in five types: slip, The slope slip (slope slip -slope topping), the downward dip (lower slip-upper toppling, the toppling, the inner slip outside the slope) and the prevention and cure suggestions are summarized according to the failure mode.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU45

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本文編號：1605452