【摘要】：邊坡的安全性評價在實際工程中有著重要意義。隨著公路事業(yè)的日新月異,各種深挖高填的邊坡已經(jīng)不可避免,由此引起的邊坡穩(wěn)定性問題也是一個不能回避的重大問題。道路邊坡失穩(wěn)不僅會影響在路上行駛車輛的安全,還可能對道路自身造成損壞,導(dǎo)致交通中斷甚至是永久的破壞,造成巨大的經(jīng)濟(jì)損失。嚴(yán)重的邊坡失穩(wěn)問題不僅關(guān)乎社會經(jīng)濟(jì)利益,還會涉及人民生命安全。長期以來,邊坡的安全性主要依靠邊坡的設(shè)計工作來保證,但是設(shè)計工作中計算所得的安全系數(shù)僅僅是邊坡在施工完成后的安全狀況,并不能反映出邊坡從開挖或填筑直到施工結(jié)束和日常使用這一過程中的安全狀況。基于這一原因,誕生了現(xiàn)場監(jiān)測技術(shù)并得到了廣泛的應(yīng)用。利用邊坡現(xiàn)場監(jiān)測手段能夠?qū)吰略谌魏螘r段內(nèi)的變形、應(yīng)力和水文狀況等信息進(jìn)行監(jiān)測,根據(jù)監(jiān)測結(jié)果可以詳細(xì)了解邊坡所處環(huán)境和自身變化的情況,判斷邊坡在各監(jiān)測時段內(nèi)的安全狀態(tài)。但是利用現(xiàn)場監(jiān)測技術(shù)判定邊坡的安全狀況還存在較多的缺點和不足,目前通過現(xiàn)場監(jiān)測判斷和分析邊坡穩(wěn)定狀況主要是通過監(jiān)測手段獲得邊坡的變形等參數(shù),針對所測得的參數(shù)設(shè)置一定的警戒值,如果監(jiān)測結(jié)果接近或超過設(shè)定的警戒值則認(rèn)定邊坡處于預(yù)警或危險狀態(tài),反之則認(rèn)為邊坡屬于穩(wěn)定狀態(tài)。但是這個警戒值的選取很大程度上是根據(jù)工作人員的經(jīng)驗確定,如果警戒值確定不當(dāng)就很容易出現(xiàn)對邊坡安全狀態(tài)的錯誤判斷。本文以典型的高邊坡為研究對象,針對目前基于現(xiàn)場監(jiān)測對邊坡進(jìn)行安全評價方法的不足,主要有以下內(nèi)容:①.使用PLAXIS有限元分析軟件建立邊坡有限元模型,對邊坡模型進(jìn)行有限元分析得到位于邊坡各部位的測點的位移值,由此分析邊坡各部位的變形特征和規(guī)律,根據(jù)分析結(jié)果對邊坡現(xiàn)場監(jiān)測系統(tǒng)中監(jiān)測點的布置提供建議;②.對現(xiàn)行的邊坡安全系數(shù)計算方法做一定的了解和介紹,分析邊坡自身及其周邊環(huán)境等要素對邊坡穩(wěn)定性的影響程度;③.利用參數(shù)反演理論根據(jù)現(xiàn)場監(jiān)測所得的邊坡位移數(shù)據(jù)反演影響邊坡穩(wěn)定性的主要邊坡土體強(qiáng)度參數(shù),最終通過反演所得的邊坡強(qiáng)度參數(shù)準(zhǔn)確的計算邊坡在各個監(jiān)測時段的穩(wěn)定系數(shù),并據(jù)此對邊坡的安全狀態(tài)進(jìn)行評價。
[Abstract]:Slope safety evaluation is of great significance in practical engineering. With the rapid development of highway industry, all kinds of deep excavation and high fill slopes have become inevitable, and the slope stability problem caused by it is also an important problem that can not be avoided. Road slope instability will not only affect the safety of vehicles driving on the road, but also may cause damage to the road itself, causing traffic disruption or even permanent damage, resulting in huge economic losses. Serious slope instability is not only related to social and economic interests, but also to the safety of people's lives. For a long time, the safety of the slope mainly depends on the design of the slope, but the safety factor calculated in the design work is only the safety condition of the slope after the completion of construction. It does not reflect the safety of the slope from excavation or filling up to the end of construction and daily use. Based on this reason, field monitoring technology was born and widely used. The deformation, stress and hydrological condition of the slope can be monitored at any time by using the field monitoring method of the slope. According to the monitoring results, the environment of the slope and its own changes can be understood in detail. To judge the safety state of the slope during each monitoring period. However, there are still many shortcomings and shortcomings in judging the safety condition of the slope by using the field monitoring technology. At present, the parameters of slope deformation are obtained by monitoring and analyzing the stability of the slope. A certain warning value is set for the measured parameters. If the monitoring result approaches or exceeds the set warning value, the slope is considered to be in an early warning or dangerous state, whereas the slope is considered to be in a stable state. However, the selection of the warning value is largely determined by the staff's experience. If the warning value is not properly determined, it is easy to misjudge the safety state of the slope. In this paper, the typical high slope as the research object, aiming at the shortcomings of the current safety evaluation method based on field monitoring, the main contents are as follows: 1. The PLAXIS finite element analysis software is used to establish the slope finite element model, and the displacement value of the measuring points located in each part of the slope is obtained by the finite element analysis of the slope model, and the deformation characteristics and rules of each part of the slope are analyzed. According to the results of the analysis, some suggestions are provided for the layout of monitoring points in the field monitoring system of slope. 2. The present calculation method of slope safety factor is introduced, and the influence degree of slope itself and its surrounding environment on slope stability is analyzed. 3. Based on the displacement data obtained from the field monitoring, the main soil mass strength parameters affecting the slope stability are retrieved by the parameter inversion theory. Finally, the stability coefficient of the slope in each monitoring period is calculated accurately by inversion of the slope strength parameters, and the safety state of the slope is evaluated accordingly.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U416.14

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相關(guān)碩士學(xué)位論文 前1條

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本文編號：2400979