落石冲击力及冲击效应评定的离散元颗粒流数值模拟研究
发布时间：2018-09-11 16:30
【摘要】：落石冲击力对于隧道棚洞结构等被动防护结构设计以及结构安全具有重要的影响,但是冲击力影响因素较多,难于精确计算,目前隧道棚洞结构等被动防护结构可靠性设计方法中没有考虑落石冲击力的影响。本文对落石冲击力计算方法以及冲击效应展开研究。主要研究内容及成果如下：(1)落石冲击力评定①利用离散元颗粒流数值模拟方法对防落石棚洞结构进行建模、计算和分析。针对落石下落高度、重量、坡面坡度和回填土厚度对落石冲击力的影响规律展开研究,其中重点研究回填土厚度对于隧道棚洞结构等被动防护结构落石冲击力的影响规律。②通过与国内外落石冲击力计算方法的结果进行对比和分析,分析了各种计算方法的计算原理,同时还对本次数值模拟落石冲击力计算结果的合理性进行了评定,并在此基础上给出了回填土合理厚度的建议值。③通过查找国内外相关文献和工程实例信息,了解并掌握目前国内外落石冲击力的计算方法的原理、考虑因素;对落石冲击力计算结果进行数据处理,通过数据拟合、多元线性回归等方法,拟合出落石冲击力计算公式。(2)落石冲击效应研究利用离散元颗粒流数值模拟方法建立防落石棚洞结构模型,记录并提取棚洞结构顶板、纵梁、立柱和基础等部件不同部位的应力,绘制应力-时程曲线,分析棚洞结构在落石冲击作用下的动态响应,为棚洞结构设计提供设计依据。
[Abstract]:The impact force of falling stone has an important influence on the design and safety of passive protective structure such as tunnel shed and tunnel structure, but there are many factors affecting the impact force, so it is difficult to calculate accurately. At present, the impact of rock drop is not taken into account in the reliability design methods of passive protective structures such as tunnel shed and tunnel structure. In this paper, the impact force calculation method and impact effect are studied. The main research contents and results are as follows: (1) the impact force assessment of rock drop. 1. Modeling, calculating and analyzing the structure of stone shed tunnel by using discrete element particle flow numerical simulation method. The influence of falling height, weight, slope gradient and backfill thickness on the impact force of rock drop is studied. The influence of backfill thickness on the impact force of rock drop of passive protective structures such as tunnel shed and tunnel structure is mainly studied by comparing and analyzing the results of calculation method of rock drop impact force at home and abroad by comparing and analyzing the law of rock falling impact force of passive protective structure such as tunnel shed and tunnel structure. The calculation principle of various calculation methods is analyzed, and the reasonableness of the calculation results of the impact force of the numerical simulation is also evaluated. On the basis of this, the suggested value of reasonable thickness of backfill soil is given. 3. By looking up the relevant literature and engineering case information at home and abroad, we can understand and master the principle and consideration factors of the calculation method of rock drop impact force at home and abroad at present. The calculation results of rock drop impact force are processed by data fitting, multivariate linear regression and so on. (2) study on the impact effect of falling stone by using discrete element particle flow numerical simulation method to establish the structure model of anti-falling stone shed tunnel, record and extract roof and longitudinal beam of shed tunnel structure, The stress of different parts such as column and foundation is drawn up the stress-time history curve is drawn and the dynamic response of the shed tunnel structure under the action of rock fall is analyzed which provides the design basis for the structure design of the shed tunnel.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P642.2
本文编号：2237223
[Abstract]:The impact force of falling stone has an important influence on the design and safety of passive protective structure such as tunnel shed and tunnel structure, but there are many factors affecting the impact force, so it is difficult to calculate accurately. At present, the impact of rock drop is not taken into account in the reliability design methods of passive protective structures such as tunnel shed and tunnel structure. In this paper, the impact force calculation method and impact effect are studied. The main research contents and results are as follows: (1) the impact force assessment of rock drop. 1. Modeling, calculating and analyzing the structure of stone shed tunnel by using discrete element particle flow numerical simulation method. The influence of falling height, weight, slope gradient and backfill thickness on the impact force of rock drop is studied. The influence of backfill thickness on the impact force of rock drop of passive protective structures such as tunnel shed and tunnel structure is mainly studied by comparing and analyzing the results of calculation method of rock drop impact force at home and abroad by comparing and analyzing the law of rock falling impact force of passive protective structure such as tunnel shed and tunnel structure. The calculation principle of various calculation methods is analyzed, and the reasonableness of the calculation results of the impact force of the numerical simulation is also evaluated. On the basis of this, the suggested value of reasonable thickness of backfill soil is given. 3. By looking up the relevant literature and engineering case information at home and abroad, we can understand and master the principle and consideration factors of the calculation method of rock drop impact force at home and abroad at present. The calculation results of rock drop impact force are processed by data fitting, multivariate linear regression and so on. (2) study on the impact effect of falling stone by using discrete element particle flow numerical simulation method to establish the structure model of anti-falling stone shed tunnel, record and extract roof and longitudinal beam of shed tunnel structure, The stress of different parts such as column and foundation is drawn up the stress-time history curve is drawn and the dynamic response of the shed tunnel structure under the action of rock fall is analyzed which provides the design basis for the structure design of the shed tunnel.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P642.2
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