加筋路堤稳定性分析软件开发与应用

发布时间：2018-01-06 15:39

本文关键词：加筋路堤稳定性分析软件开发与应用　出处：《中国地质大学(北京)》2015年硕士论文　论文类型：学位论文

【摘要】：路堤加筋技术是一项重大的技术革新。与路堤土体相比,筋材具有较高的抗拉强度。加筋后,路堤的稳定性和抵抗变形的能力得到了很大程度的提高。加筋法不仅减少了路堤的不均匀沉降,而且有利于路堤中集中应力的扩散,对提高工程质量,节约工程用地,减少工程成本意义重大。本文论述了加筋土的作用机理,对筋材拔出和拉断破坏时加筋土结构的受力特性进行了分析。讨论了加筋路堤的失效原因,主要包括路基压实度不够、荷载不均匀、路堤填料质量差、地基软弱等几个方面。将加筋路堤的破坏方式分为三大类,包括路堤失稳、筋材破坏和地基破坏。研究了加筋路堤稳定性分析方法,通过实例对总应力法、有效固结应力法、准毕肖普法和改进后的通用条分法进行了对比。采用准毕肖普法得到的路堤安全系数大于总应力法和固结应力法的计算结果。这是因为,与总应力法和固结应力法相比,准毕肖普法考虑了土条间力的相互作用,结果更接近于实际值。与总应力法相比,采用有效固结应力法计算路堤的安全系数时,将地基土由于固结作用产生的强度增量整合到土条的抗剪强度中,因此所得到的抗滑力较总应力法大。基于Visual Basic.NET平台开发了加筋路堤稳定性分析软件。该软件与ANSYS提供的APDL语言连接,通过输入的界面参数自动生成ANSYS命令流,并将命令流自动导入ANSYS软件,进行有限元分析。通过工程实例验证了该软件的实用性,并分析了加筋对路堤稳定性的影响。总结得到加筋可以减小路堤的沉降量和侧向位移值,但是作用效果不明显。加筋能够有效的提高路堤的稳定性安全系数,随着路堤填高的不断增加,这种效果逐渐减弱。
[Abstract]:Embankment reinforcement technology is a major technical innovation. Compared with embankment soil, reinforced material has higher tensile strength. The stability of embankment and the ability of resisting deformation have been greatly improved. The reinforcement method not only reduces the uneven settlement of embankment, but also is conducive to the diffusion of concentrated stress in embankment and to the improvement of engineering quality. It is of great significance to save engineering land and reduce project cost. This paper discusses the action mechanism of reinforced soil. The mechanical characteristics of reinforced earth structure under pull-out and tensile failure are analyzed, and the failure reasons of reinforced embankment are discussed, including insufficient compaction of embankment, uneven load and poor quality of embankment filler. The failure modes of reinforced embankment are divided into three categories, including embankment instability, reinforced material failure and foundation failure. The method of stability analysis of reinforced embankment is studied, and the total stress method is given through examples. The effective consolidation stress method, quasi-Bishop method and improved general strip method are compared. The safety factor of embankment obtained by quasi-Bishop method is greater than that of total stress method and consolidation stress method. Compared with the total stress method and the consolidation stress method, the quasi-Bishop method takes into account the interaction between soil strips and the result is closer to the actual value. Compared with the total stress method, the effective consolidation stress method is used to calculate the safety factor of embankment. The strength increment of foundation soil due to consolidation is integrated into the shear strength of soil strip. Therefore, the anti-slip force obtained is higher than that obtained by the total stress method. The software of stability analysis of reinforced embankment is developed on Basic.NET platform, which is connected with APDL language provided by ANSYS. The ANSYS command stream is automatically generated by the input interface parameters, and the command stream is automatically imported into the ANSYS software for finite element analysis. The practicability of the software is verified by an engineering example. The influence of reinforcement on the stability of embankment is analyzed. It is concluded that reinforcement can reduce the settlement and lateral displacement of embankment, but the effect is not obvious. The reinforcement can effectively improve the stability safety factor of embankment. With the increasing of embankment filling, this effect is gradually weakened.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.12

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