本文選題：多元結(jié)構(gòu)邊坡 + 抗剪強(qiáng)度參數(shù)��； 參考：《長沙理工大學(xué)》2015年碩士論文

【摘要】：邊坡巖土體抗剪強(qiáng)度參數(shù)是穩(wěn)定性定量評價(jià)的重要參數(shù),工程中常常出現(xiàn)φ值相差僅1-2°,邊坡穩(wěn)定性出現(xiàn)急劇變化的情況。確保巖土體抗剪強(qiáng)度參數(shù)取值的準(zhǔn)確性,是邊坡穩(wěn)定計(jì)算和工程設(shè)計(jì)的首要任務(wù)。本文利用協(xié)同優(yōu)化層次性和并行性思想,針對邊坡潛在滑動(dòng)面未知,且潛在滑動(dòng)面穿越多種待反演土體的多元結(jié)構(gòu)邊坡的土體抗剪強(qiáng)度參數(shù)反演問題,提出了協(xié)同反分析的新思路。依據(jù)某實(shí)際工程對邊坡典型剖面內(nèi)的抗剪強(qiáng)度參數(shù)在天然工況和暴雨工況下進(jìn)行反分析研究。根據(jù)反演推薦抗剪強(qiáng)度參數(shù),采用極限平衡法和有限元法兩種方法分析了蓄水前后邊坡穩(wěn)定性,并對邊坡加固措施的力學(xué)特性進(jìn)行分析和評價(jià),得出以下結(jié)論:(1)天然工況和暴雨工況反分析得到的抗剪強(qiáng)度參數(shù)值極為相識,同時(shí)兩種工況反演得到的抗剪強(qiáng)度參數(shù)值與地質(zhì)推薦的土體抗剪強(qiáng)度參數(shù)值也基本一致,表明協(xié)同反分析的層次性和并行性思想在解決邊坡土體與土體之間、計(jì)算剖面與剖面之間的相互影響以及抗剪強(qiáng)度參數(shù)反分析解的不唯一性等方面具有一定的成效,為多元結(jié)構(gòu)的邊坡抗剪強(qiáng)度參數(shù)的反分析提供了一條新的有效途徑。(2)邊坡穩(wěn)定分析結(jié)果表明:無論采用極限平衡法還是有限元法,水庫蓄水均為影響邊坡失穩(wěn)的主要因素;水庫蓄水后,邊坡遭遇各種設(shè)計(jì)工況時(shí),(如:水位驟降、設(shè)計(jì)暴雨以及設(shè)計(jì)地震工況),暴雨工況對穩(wěn)定性產(chǎn)生的影響最大,邊坡穩(wěn)定性最低。因此當(dāng)邊坡在遭遇設(shè)計(jì)暴雨工況時(shí),需特別加強(qiáng)對邊坡穩(wěn)定性的安全監(jiān)測。(3)預(yù)應(yīng)力錨索力學(xué)特性分析結(jié)果表明:二維和三維數(shù)值分析中,預(yù)應(yīng)力錨索的軸力大小和變化規(guī)律基本一致。暴雨工況下預(yù)應(yīng)力錨索軸力增加幅度最大,部分預(yù)應(yīng)力錨索出現(xiàn)不同程度的預(yù)應(yīng)力松弛現(xiàn)象,總體而言預(yù)應(yīng)力錨索基本都能正常發(fā)揮支護(hù)功。(4)抗滑樁力學(xué)特性分析結(jié)果表明:抗滑樁內(nèi)力和變形最大值分別出現(xiàn)在不同的設(shè)計(jì)工況,其中暴雨工況內(nèi)力值最大,地震工況變形量最大;抗滑樁受力情況亦隨空間位置的不同而不同,邊坡中心剖面部位的抗滑樁受力最大,兩側(cè)抗滑樁內(nèi)力相對較小�？傮w而言,邊坡支護(hù)措施合理有效。
[Abstract]:The shear strength parameter of rock and soil mass is an important parameter in the quantitative evaluation of slope stability. In engineering, the difference of 蠁 value is only 1-2 擄, and the slope stability changes rapidly. To ensure the accuracy of shear strength parameters of rock and soil is the primary task of slope stability calculation and engineering design. In this paper, based on the idea of synergetic optimization hierarchy and parallelism, the shear strength parameter inversion problem of multi-structural slope with multiple structures that the potential slip surface is unknown, and the potential slip surface passes through a variety of soil layers to be retrieved, is discussed. A new idea of collaborative inverse analysis is put forward. According to a practical project, the parameters of shear strength in typical section of slope are studied under natural and rainstorm conditions. According to the inversion recommended shear strength parameters, the stability of slope before and after water storage is analyzed by using limit equilibrium method and finite element method, and the mechanical characteristics of slope reinforcement measures are analyzed and evaluated. The following conclusions are drawn: (1) the parameters of shear strength obtained by inverse analysis of natural and rainstorm conditions are very familiar, and the parameters of shear strength obtained by inversion of the two conditions are basically the same as those of soil mass recommended by geology. The results show that the hierarchy and parallelism of synergetic inverse analysis is effective in solving the interaction between slope soil and soil, the interaction between profile and section, and the non-uniqueness of back analysis solution of shear strength parameter. This paper provides a new effective way for the back analysis of shear strength parameters of multi-structure slope. The results of slope stability analysis show that: whether using limit equilibrium method or finite element method, reservoir water storage is the main factor affecting slope instability; After the reservoir impoundment, the slope encounters various design conditions (such as sudden drop of water level, design rainstorm and design earthquake condition). The rainstorm condition has the biggest influence on the stability, and the slope stability is the lowest. Therefore, when the slope is subjected to heavy rain, it is necessary to strengthen the safety monitoring of slope stability. The analysis results of the mechanical characteristics of prestressed anchor cable show that: in two-dimensional and three-dimensional numerical analysis, The axial force of prestressed Anchorage cable is basically the same as the law of change. Under rainstorm conditions, the axial force of prestressed anchor cable increases by the largest extent, and some prestressed cables show different degree of pre-stress relaxation phenomenon. In general, prestressed anchor cables can basically give full play to the support work. 4) the analysis results of the mechanical properties of anti-slide pile show that the maximum internal force and deformation of anti-slide pile appear in different design conditions respectively, and the maximum value of internal force in rainstorm condition is the largest. The deformation of anti-slide pile under earthquake condition is the largest and the stress of anti-slide pile varies with the space position. The anti-slide pile in the central section of slope has the largest force and the internal force of the anti-slide pile on both sides is relatively small. Overall, the slope support measures are reasonable and effective.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU43

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