百米級高瀝青混凝土心墻壩受力特性研究
發(fā)布時(shí)間：2018-07-18 14:54
【摘要】：瀝青混凝土心墻壩以其良好的抗?jié)B性、抗衰老性、抗腐蝕性等成為了水工壩體結(jié)構(gòu)的新興壩型之一。近年來,越來越多的瀝青混凝土心墻壩壩高都突破百米,筑壩過程中在壩體重力、施工荷載和水壓力的作用下,大壩會(huì)發(fā)生較大的不均勻沉降,嚴(yán)重威脅大壩的安全。目前國內(nèi)百米級高瀝青混凝土心墻壩受力特性研究相對較少。因此研究百米級高瀝青混凝土心墻壩的受力特性具有重要的工程實(shí)踐意義。本文的主要研究成果為:(1)首先在ABAQUS的平臺(tái)上開發(fā)了鄧肯張E-B本構(gòu)模型,其次以新疆庫什塔依水電站工程為背景,對大壩在竣工期和蓄水期時(shí)心墻的受力特性進(jìn)行了系統(tǒng)地分析,然后對瀝青混凝土的E-B本構(gòu)模型參數(shù)進(jìn)行敏感性分析。結(jié)果顯示心墻的橫河向位移、順河向位移和大、小主應(yīng)力均隨著E-B模型參數(shù)的變化呈現(xiàn)一定的規(guī)律性,其中內(nèi)摩擦角φ、黏聚力c、破壞比R_f和參數(shù)k對心墻順河向位移和垂向位移的影響較大,對心墻大、小主應(yīng)力影響較小,屬于高敏感性參數(shù);而模量指數(shù)n對心墻順河向位移、垂向位移和大、小主應(yīng)力影響較小,屬于低敏感性參數(shù)。(2)從瀝青混凝土心墻的破壞機(jī)理出發(fā),提出利用曲壩曲心墻來代替直壩直心墻以減小心墻拉應(yīng)力的新方案,同時(shí)還建立了心墻曲率分別為9.6×10-5、2.4×10~(-4)和3.8×10~(-4)的三種新壩型。通過對比分析三種新壩型竣工期和蓄水期時(shí)心墻的應(yīng)力和位移變化規(guī)律,論證曲壩曲心墻的合理性。結(jié)果顯示曲壩曲心墻可以明顯減小心墻的拉應(yīng)力,且心墻曲率越大,效果越明顯。(3)以直壩直心墻為分析實(shí)例,建立壩高分別為50m、130m和150m的三種瀝青混凝土心墻壩計(jì)算模型,通過對比分析不同壩高下心墻竣工期和蓄水期的受力特點(diǎn),得出了壩高對心墻受力特性影響的一般規(guī)律。結(jié)果顯示壩高的增加,使得心墻底部的壓應(yīng)力快速增長,同時(shí)心墻壩肩兩側(cè)的拉應(yīng)力區(qū)也有著進(jìn)一步擴(kuò)大的趨勢。
[Abstract]:Asphalt concrete core dam has become one of the new dam types of hydraulic dam body for its good impermeability, aging resistance and corrosion resistance. In recent years, more and more asphalt concrete core wall dams have exceeded 100 meters in height. Under the action of dam gravity, construction load and water pressure, the dam will have a large uneven settlement, which will seriously threaten the safety of the dam. At present, there are few researches on the stress characteristics of 100 m high asphalt concrete core dam in China. Therefore, it is of great practical significance to study the mechanical characteristics of 100-meter high asphalt concrete core dam. The main research results of this paper are as follows: (1) first of all, Duncan Zhang E-B constitutive model was developed on Abaqus platform; secondly, based on the Kushtay Hydropower Station project in Xinjiang, the mechanical characteristics of the core wall during the completion and storage periods of the dam were systematically analyzed. Then the sensitivity of E-B constitutive model parameters of asphalt concrete is analyzed. The results show that the horizontal displacement of the core wall, the displacement along the river and the large and small principal stresses show a certain regularity with the change of the parameters of the E-B model. The internal friction angle 蠁, cohesion force c, failure ratio R _ f and parameter k have a greater effect on the downstream and vertical displacement of the core wall, and have less effect on the core wall and small principal stress, which are highly sensitive parameters, while modulus exponent n has a high sensitivity to the displacement of the core wall along the river. The vertical displacement and the large and small principal stresses have little influence on the core wall, which is a low sensitive parameter. (2) based on the failure mechanism of the asphalt concrete core wall, a new scheme of reducing the tensile stress of the core wall by using the curved core wall instead of the straight core wall is put forward. At the same time, three new dam types with the curvature of 9.6 脳 10 ~ (-5) and 3.8 脳 10 ~ (-4) have been established, respectively. The rationality of the curved core wall of curved dam is demonstrated by comparing and analyzing the stress and displacement of the core wall during the completion and storage periods of three new dam types. The results show that the curved core wall of curved dam can obviously reduce the tensile stress of the core wall, and the greater the curvature of the core wall, the more obvious the effect is. (3) taking the straight core wall of the straight dam as an example, the calculation models of three kinds of asphalt concrete core wall dam with the height of 50 m or 130 m and 150 m respectively are established. By comparing and analyzing the stress characteristics of the core wall under different dam heights during the completion and storage periods, the general law of the influence of dam height on the stress characteristics of the core wall is obtained. The results show that the compression stress at the bottom of the core wall increases rapidly with the increase of the dam height, and the tensile stress zone on both sides of the dam abutment of the core wall also has a tendency to expand further.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV642
[Abstract]:Asphalt concrete core dam has become one of the new dam types of hydraulic dam body for its good impermeability, aging resistance and corrosion resistance. In recent years, more and more asphalt concrete core wall dams have exceeded 100 meters in height. Under the action of dam gravity, construction load and water pressure, the dam will have a large uneven settlement, which will seriously threaten the safety of the dam. At present, there are few researches on the stress characteristics of 100 m high asphalt concrete core dam in China. Therefore, it is of great practical significance to study the mechanical characteristics of 100-meter high asphalt concrete core dam. The main research results of this paper are as follows: (1) first of all, Duncan Zhang E-B constitutive model was developed on Abaqus platform; secondly, based on the Kushtay Hydropower Station project in Xinjiang, the mechanical characteristics of the core wall during the completion and storage periods of the dam were systematically analyzed. Then the sensitivity of E-B constitutive model parameters of asphalt concrete is analyzed. The results show that the horizontal displacement of the core wall, the displacement along the river and the large and small principal stresses show a certain regularity with the change of the parameters of the E-B model. The internal friction angle 蠁, cohesion force c, failure ratio R _ f and parameter k have a greater effect on the downstream and vertical displacement of the core wall, and have less effect on the core wall and small principal stress, which are highly sensitive parameters, while modulus exponent n has a high sensitivity to the displacement of the core wall along the river. The vertical displacement and the large and small principal stresses have little influence on the core wall, which is a low sensitive parameter. (2) based on the failure mechanism of the asphalt concrete core wall, a new scheme of reducing the tensile stress of the core wall by using the curved core wall instead of the straight core wall is put forward. At the same time, three new dam types with the curvature of 9.6 脳 10 ~ (-5) and 3.8 脳 10 ~ (-4) have been established, respectively. The rationality of the curved core wall of curved dam is demonstrated by comparing and analyzing the stress and displacement of the core wall during the completion and storage periods of three new dam types. The results show that the curved core wall of curved dam can obviously reduce the tensile stress of the core wall, and the greater the curvature of the core wall, the more obvious the effect is. (3) taking the straight core wall of the straight dam as an example, the calculation models of three kinds of asphalt concrete core wall dam with the height of 50 m or 130 m and 150 m respectively are established. By comparing and analyzing the stress characteristics of the core wall under different dam heights during the completion and storage periods, the general law of the influence of dam height on the stress characteristics of the core wall is obtained. The results show that the compression stress at the bottom of the core wall increases rapidly with the increase of the dam height, and the tensile stress zone on both sides of the dam abutment of the core wall also has a tendency to expand further.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV642
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2 余林;鳳煒;何建新;;組合式瀝青混凝土心墻壩初探[J];水利規(guī)劃與設(shè)計(jì);2016年09期
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