本文選題：預應力錨索 + 拉拔試驗��； 參考：《西安科技大學》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久性,巖土錨固由于其特有的優(yōu)勢而迅速發(fā)展并廣泛應用起來。預應力錨索內(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)對錨固體系的錨固效果有重要影響,因此對預應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。本文通過現(xiàn)場試驗、理論分析及數(shù)值模擬等方法,對預應力錨索的荷載傳遞及錨固效果進行了深入的研究,主要開展了以下方面的研究:1、通過調(diào)查、資料收集等手段,將影響錨索錨固效果的內(nèi)在因素作為研究對象,制定預應力錨索現(xiàn)場試驗方案;通過改變錨索錨固段長度和注漿體配合比等因素,在黃土地層中對預應力錨索進行了現(xiàn)場試驗,得到了錨索的P-S曲線;分析了對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曲線模型,同時分析了現(xiàn)場試驗的P-S曲線在各級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度參數(shù)1τ、1K和彈塑性變形階段的抗剪強度參數(shù)2τ、2K的確定方法,并結(jié)合現(xiàn)場試驗的P-S曲線,給出了現(xiàn)場試驗的抗剪強度參數(shù),并結(jié)合算例對錨索的荷載傳遞規(guī)律進行了分析。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區(qū)范圍及錨固段破壞時的最大剪切位移的計算方法;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,并對其影響參數(shù)進行了分析。4、結(jié)合現(xiàn)場試驗的抗剪剛度參數(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ANSYS中非線性彈簧單元建立了F-D本構(gòu)關(guān)系,對錨索錨固段的粘結(jié)滑移關(guān)系進行了數(shù)值模擬分析,結(jié)合理論分析和現(xiàn)場試驗對比分析,說明了ANSYS有限元軟件對錨索錨固段的粘結(jié)滑移性能的數(shù)值模擬可行性較好,對預應力錨索荷載傳遞規(guī)律的認識及錨索錨固效果的研究有一定的指導意義。
[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.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU444;TU476

【參考文獻】

相關(guān)期刊論文 前10條

1 葉紅;陳燕平;;基于Mindlin解地震作用下壓力型錨索的擬靜力分析[J];振動與沖擊;2017年02期

2 葉紅;陳燕平;;壓力型錨索動態(tài)響應的應力數(shù)值模擬分析[J];地下空間與工程學報;2016年06期

3 李金華;朱海西;宋濤;;預應力錨索內(nèi)錨固段剪應力分布規(guī)律研究[J];西安科技大學學報;2016年03期

4 劉曉明;蔣宏偉;楊瑞峰;;錨桿錨固界面荷載傳遞參數(shù)P-S曲線反演法適用性研究[J];水文地質(zhì)工程地質(zhì);2015年05期

5 陳文強;賈志欣;趙宇飛;劉立鵬;周紀軍;林興超;;剪切過程中錨桿的軸向和橫向作用分析[J];巖土力學;2015年01期

6 張偉;劉泉聲;;基于剪切試驗的預應力錨桿變形性能分析[J];巖土力學;2014年08期

7 劉愛卿;鞠文君;許海濤;王洋;;錨桿預緊力對節(jié)理巖體抗剪性能影響的試驗研究[J];煤炭學報;2013年03期

8 張偉;劉泉聲;;節(jié)理巖體錨桿的綜合變形分析[J];巖土力學;2012年04期

9 谷拴成;葉根飛;陳弦;;錨桿錨固段極限抗剪強度參數(shù)試驗[J];煤炭科學技術(shù);2010年06期

10 谷拴成;陳弦;葉根飛;;考慮孔壁界面剪切滑移錨桿錨固段應力分布[J];礦業(yè)研究與開發(fā);2010年02期

相關(guān)博士學位論文 前1條

1 仵建斌;方鋼管混凝土結(jié)構(gòu)粘結(jié)滑移基本性能研究[D];西安建筑科技大學;2011年

相關(guān)碩士學位論文 前1條

1 陳弦;錨桿拉拔荷載傳遞機理及試驗研究[D];西安科技大學;2010年

，

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