地震作用下框架锚杆支护边坡动力分析
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摘要
框架锚杆支护结构是最近几年随着支护结构的发展而提出的一种新型支护结构。由于该结构可以有效的控制边坡的侧移,并且可以结合一定的绿化措施,因此在公路和铁路边坡中得到了很快的发展。另外,由于该支护结构是一种柔性支护结构,可以允许一定的变形,因此具有一定的抗震性能,但是目前国内外对于框架锚杆支挡结构的抗震性能及动力问题方面的研究还十分缺乏。5.12地震过程中,用于边坡的该支护结构就表现出了很好的抗震性能。
框架锚杆柔性支挡结构作为一种新型支挡结构,在国家西部大开发过程中,发挥了巨大的作用,深入开展柔性挡墙的地震作用分析与设计研究,对国家新一轮的拉动内需政策有重大的现实意义。本文针对框架锚杆支护边坡动力分析及抗震设计方法进行了研究,提出了新的的思路和计算方法,论文研究工作如下：
依据框架锚杆支护体系的作用机理,在建立分析模型时分为两步,即把框架锚杆支护边坡结构体系分为动土压力模型和框架锚杆支挡结构动力模型两部分。一是考虑坡高对动土压力分布的影响,认为地震时作用在支挡结构上的土压力,在支挡结构顶部最大,向下逐渐减小,呈倒三角形分布。二是基于Penzien提出的集中质量法,将框架结构离散化为质点串,而锚杆以弹簧支座形式将框架与土体进行连接,取一榀框架柱为计算单元,建立相应的动力模型控制方程,通过振型分析建立振型方程,并求解振型反应。通过对动土压力的求解和框架结构振型反应的分析,可以得到框架各结点处的支座反力,从而为框架锚杆支护边坡的抗震设计提供一定的依据。
最后通过一工程实例,并用以往有限元软件ADINA分析的结果对该计算模型进行了验证,结果表明这种计算模型对土质较均匀的边坡动力设计和分析是可行的。
Supporting structure with frame-anchors with the development of supporting structure made of a new type of supporting structure. Because the structure can effectively control the displacement of the slope, and can be combined with some greening measures, therefore, the structure has been developed rapidly in the road and rail slope. In addition, the supporting structure has certain seismic performance because the flexible structure can allow a certain deformation.But at present both at home and abroad, the study of seismic performance and dynamic problems are still very lack.During the 5.12 earthquake, the slope with thus supporting structure has demonstrated good seismic performance.
Supporting structure with frame-anchors as a new type of retaining structures, has played a significant role in the process of western development.It has great realistic meaning in the new national policy of stimulating domestic demand,with further development about seismic analysis and design research of flexible retaining wall.This paper carried out a research based on the study about dynamic analysis and the seismic design method of the slope with frame-anchors,and put forward some new ideas and calculations, research work are as follows:
According to the mechanism of supporting system with frame-anchors, analysis model is divided into two steps of dynamic soil pressure model and dynamic frame-anchors supporting structures model. Firstly,consider the effects of slope height on seismic soil pressure distribution. When earthquake happens, the soil pressure act on the supporting structures was supposed to distribute as inverse triangles. The maximum pressure was on the top of the wall and decreased gradually downwards. Secondly, based on lumped masses model developed by Penzien, the frame structure analysis model was constructed with a set of lumped masses. Frame structure and soil was connected by anchors with spring supports. Taking the columns of frame as calculating unit, the corresponding control equation of dynamic model was established. Through the analysis of vibration mode, vibration equation was developed and vibration mode reaction was solved. Based on the solution of dynamic soil pressure and the analysis of vibration model response, support reaction of each node can be obtained. The result of dynamic soil pressure and vibration model responss can provide reference for the seismic design of supporting system with frame-anchors.
Finally, through an engineering example, with the previous results of FEA software ADINA, this calculation model was verified.The results show that the computational model is feasible to the dynamic design and analysis about soil slope which is more uniform.
框架锚杆柔性支挡结构作为一种新型支挡结构,在国家西部大开发过程中,发挥了巨大的作用,深入开展柔性挡墙的地震作用分析与设计研究,对国家新一轮的拉动内需政策有重大的现实意义。本文针对框架锚杆支护边坡动力分析及抗震设计方法进行了研究,提出了新的的思路和计算方法,论文研究工作如下：
依据框架锚杆支护体系的作用机理,在建立分析模型时分为两步,即把框架锚杆支护边坡结构体系分为动土压力模型和框架锚杆支挡结构动力模型两部分。一是考虑坡高对动土压力分布的影响,认为地震时作用在支挡结构上的土压力,在支挡结构顶部最大,向下逐渐减小,呈倒三角形分布。二是基于Penzien提出的集中质量法,将框架结构离散化为质点串,而锚杆以弹簧支座形式将框架与土体进行连接,取一榀框架柱为计算单元,建立相应的动力模型控制方程,通过振型分析建立振型方程,并求解振型反应。通过对动土压力的求解和框架结构振型反应的分析,可以得到框架各结点处的支座反力,从而为框架锚杆支护边坡的抗震设计提供一定的依据。
最后通过一工程实例,并用以往有限元软件ADINA分析的结果对该计算模型进行了验证,结果表明这种计算模型对土质较均匀的边坡动力设计和分析是可行的。
Supporting structure with frame-anchors with the development of supporting structure made of a new type of supporting structure. Because the structure can effectively control the displacement of the slope, and can be combined with some greening measures, therefore, the structure has been developed rapidly in the road and rail slope. In addition, the supporting structure has certain seismic performance because the flexible structure can allow a certain deformation.But at present both at home and abroad, the study of seismic performance and dynamic problems are still very lack.During the 5.12 earthquake, the slope with thus supporting structure has demonstrated good seismic performance.
Supporting structure with frame-anchors as a new type of retaining structures, has played a significant role in the process of western development.It has great realistic meaning in the new national policy of stimulating domestic demand,with further development about seismic analysis and design research of flexible retaining wall.This paper carried out a research based on the study about dynamic analysis and the seismic design method of the slope with frame-anchors,and put forward some new ideas and calculations, research work are as follows:
According to the mechanism of supporting system with frame-anchors, analysis model is divided into two steps of dynamic soil pressure model and dynamic frame-anchors supporting structures model. Firstly,consider the effects of slope height on seismic soil pressure distribution. When earthquake happens, the soil pressure act on the supporting structures was supposed to distribute as inverse triangles. The maximum pressure was on the top of the wall and decreased gradually downwards. Secondly, based on lumped masses model developed by Penzien, the frame structure analysis model was constructed with a set of lumped masses. Frame structure and soil was connected by anchors with spring supports. Taking the columns of frame as calculating unit, the corresponding control equation of dynamic model was established. Through the analysis of vibration mode, vibration equation was developed and vibration mode reaction was solved. Based on the solution of dynamic soil pressure and the analysis of vibration model response, support reaction of each node can be obtained. The result of dynamic soil pressure and vibration model responss can provide reference for the seismic design of supporting system with frame-anchors.
Finally, through an engineering example, with the previous results of FEA software ADINA, this calculation model was verified.The results show that the computational model is feasible to the dynamic design and analysis about soil slope which is more uniform.
引文
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