本文選題：預(yù)應(yīng)力錨索 + 拉拔試驗(yàn)�。� 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：巖土錨固體系是大型巖土工程的重要組成部分,巖土錨固效果決定著巖土錨固體系的安全性和長(zhǎng)久性,巖土錨固由于其特有的優(yōu)勢(shì)而迅速發(fā)展并廣泛應(yīng)用起來(lái)。預(yù)應(yīng)力錨索內(nèi)錨固段是錨固體系的主要組成部分,是錨固體系的主要受力和傳力結(jié)構(gòu),錨固段的受力狀態(tài)對(duì)錨固體系的錨固效果有重要影響,因此對(duì)預(yù)應(yīng)力錨索的錨固效果及荷載傳遞規(guī)律的研究具有重要的理論意義和工程意義。本文通過(guò)現(xiàn)場(chǎng)試驗(yàn)、理論分析及數(shù)值模擬等方法,對(duì)預(yù)應(yīng)力錨索的荷載傳遞及錨固效果進(jìn)行了深入的研究,主要開(kāi)展了以下方面的研究:1、通過(guò)調(diào)查、資料收集等手段,將影響錨索錨固效果的內(nèi)在因素作為研究對(duì)象,制定預(yù)應(yīng)力錨索現(xiàn)場(chǎng)試驗(yàn)方案;通過(guò)改變錨索錨固段長(zhǎng)度和注漿體配合比等因素,在黃土地層中對(duì)預(yù)應(yīng)力錨索進(jìn)行了現(xiàn)場(chǎng)試驗(yàn),得到了錨索的P-S曲線(xiàn);分析了對(duì)各因素下錨索的錨固效果及破壞模式;總結(jié)了現(xiàn)有的錨索拉拔P-S曲線(xiàn)模型,同時(shí)分析了現(xiàn)場(chǎng)試驗(yàn)的P-S曲線(xiàn)在各級(jí)荷載作用下錨索的彈性位移和彈塑性位移。2、基于B.Benmokrane建立的剪切滑移本構(gòu)模型,推導(dǎo)了在拉拔荷載作用下錨固段在不同變形階段軸力、錨固層界面剪力及變形分布規(guī)律,并給出了錨固段分別在彈性變形階段和彈塑性變形階段的極限承載力的計(jì)算公式;結(jié)合理論分析得到了錨固段與巖土體界面分別在彈性變形階段的抗剪強(qiáng)度參數(shù)1τ、1K和彈塑性變形階段的抗剪強(qiáng)度參數(shù)2τ、2K的確定方法,并結(jié)合現(xiàn)場(chǎng)試驗(yàn)的P-S曲線(xiàn),給出了現(xiàn)場(chǎng)試驗(yàn)的抗剪強(qiáng)度參數(shù),并結(jié)合算例對(duì)錨索的荷載傳遞規(guī)律進(jìn)行了分析。3、錨固段橫向方向的受力,基于Pasternak彈性地基梁模型,推導(dǎo)出在橫向荷載作用下錨固段的撓度、彎矩、剪力、轉(zhuǎn)角和土體反力的分布規(guī)律,并給出了錨固段在橫向荷載作用下巖土體松動(dòng)區(qū)范圍及錨固段破壞時(shí)的最大剪切位移的計(jì)算方法;以黃土地層為算例,分析了錨固段在橫向荷載下受力和變形規(guī)律,并對(duì)其影響參數(shù)進(jìn)行了分析。4、結(jié)合現(xiàn)場(chǎng)試驗(yàn)的抗剪剛度參數(shù),給出了剪切滑移uτ-本構(gòu)關(guān)系,并結(jié)合剪切滑移本構(gòu)方程對(duì)ANSYS中非線(xiàn)性彈簧單元建立了F-D本構(gòu)關(guān)系,對(duì)錨索錨固段的粘結(jié)滑移關(guān)系進(jìn)行了數(shù)值模擬分析,結(jié)合理論分析和現(xiàn)場(chǎng)試驗(yàn)對(duì)比分析,說(shuō)明了ANSYS有限元軟件對(duì)錨索錨固段的粘結(jié)滑移性能的數(shù)值模擬可行性較好,對(duì)預(yù)應(yīng)力錨索荷載傳遞規(guī)律的認(rèn)識(shí)及錨索錨固效果的研究有一定的指導(dǎo)意義。
[Abstract]:Rock and soil anchoring system is an important part of large geotechnical engineering. The effect of rock and soil anchoring determines the safety and longevity of rock and soil anchoring system. Because of its unique advantages, geotechnical anchoring develops rapidly and is widely used. The internal anchoring section of prestressed Anchorage cable is the main component of the Anchorage system, which is the main force and transmission structure of the Anchorage system. The stress state of the Anchorage section has an important influence on the anchoring effect of the Anchorage system. Therefore, it is of great theoretical and engineering significance to study the anchoring effect and load transfer law of prestressed Anchorage cable. In this paper, through field test, theoretical analysis and numerical simulation, the load transfer and anchoring effect of prestressed Anchorage cable are deeply studied. The following aspects are mainly studied: 1, through investigation, data collection, etc. Taking the internal factors which affect the anchoring effect of anchor cable as the research object, the field test scheme of prestressed anchor cable is established, and the field test of prestressed anchor cable is carried out in the loess layer by changing the length of anchoring section and the proportion of grouting body, and other factors, such as changing the length of anchoring section of anchor cable and the proportion of grouting body, etc. The P-S curve of anchor cable is obtained, the anchoring effect and failure mode of anchor cable under various factors are analyzed, and the existing P-S curve model of cable drawing is summarized. At the same time, the elastic displacement and elastic-plastic displacement of the anchor cable under various loads are analyzed. Based on the shear slip constitutive model established by B. Benmokrane, the axial forces of the anchoring section at different deformation stages under the pull-out load are derived. The distribution of shear force and deformation at the interface of Anchorage layer is studied. The calculation formulas of ultimate bearing capacity of Anchorage section in elastic deformation stage and elastic-plastic deformation stage are given. Based on the theoretical analysis, the determination method of shear strength parameter 1 蟿 ~ 1K at elastic deformation stage and shear strength parameter 2 蟿 ~ (2K) at elastic deformation stage at the interface of Anchorage section and rock and soil is obtained, and the P-S curve of field test is combined. The shear strength parameters of field test are given, and the load transfer law of Anchorage cable is analyzed. 3. Based on Pasternak elastic foundation beam model, the deflection of anchoring section under transverse load is deduced. The distribution law of bending moment, shear force, rotation angle and soil reaction force is given, and the calculation method of maximum shear displacement of loose zone of rock and soil under transverse load and failure of anchoring section is given. The law of stress and deformation of Anchorage section under transverse load is analyzed, and the influence parameters of Anchorage section are analyzed. The shear slip u 蟿 -constitutive relation is given according to the shear stiffness parameters of field test. Based on the shear slip constitutive equation, the F-D constitutive relation of nonlinear spring element in ANSYS is established, and the bond-slip relationship of anchor cable is numerically simulated and compared with the theoretical analysis and field test. It is shown that the ANSYS finite element software is feasible for numerical simulation of the bond-slip behavior of the anchoring section of the anchor cable, and has certain guiding significance for the understanding of the load transfer law of the prestressed anchor cable and the study of the anchoring effect of the anchor cable.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU444;TU476

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