某高边坡预应力锚索抗滑桩加固优化研究

发布时间：2018-04-11 12:07

本文选题：高边坡 + 抗滑桩　；参考：《广东工业大学》2013年硕士论文

【摘要】：预应力锚索抗滑桩支护结构是由预应力锚索和抗滑桩支护结构组合形成的一种新型支护结构,其受力和结构形式更加合理,兼有预应力锚索和抗滑桩支护结构二者的优点,实际工程应用中既能充分发挥材料的强度,又能满足经济合理的要求,还能大大提高边坡的整体稳定性。目前已在工程实践中得到越来越广泛的应用,但在理论研究方面还未取得较大突破,理论研究成果远远滞后于工程实践。本文在国内外研究现状的基础上,结合相关的研究成果,采用大型有限元分析软件MIDAS/GTS对预应力锚索抗滑桩的支护效果进行深入分析,并将模拟结果与工程实际监测结果对比,验证所选模型参数是否合理。文中以边坡安全系数为主要目标函数,对抗滑桩截面尺寸、桩锚固深度、抗滑桩埋设位置、桩间净距和锚索锚固段长度、锚索方向角以及锚索预应力等参数的选用做进一步优化,最终使桩、锚索、边坡三者在采用最佳优化参数的条件下,预应力锚索抗滑桩能提供最小的抵抗力或者发挥最大的安全系数。相关优化参数的选用可为类似的高边坡工程提供一定的参考。本文开展的工作主要包括以下几个方面： 1、通过阅读大量相关文献,从试验、计算及优化设计三方面重点论述预应力锚索抗滑桩加固技术的研究现状。对预应力锚索和抗滑桩的作用机理做了简要论述,并分析两种支护结构单独支护与联合支护时的区别,提出最优支护方式。 2、介绍了有限元和土体本构关系相关理论,归纳总结不同本构模型的应用条件及范围,选出适合本文实际情况的本构模型,同时对有限元数值模拟分析的研究思路及边坡和相关支护结构所采用的模型做了简单介绍。 3、结合广东西部沿海高速公路K21+240标段高边坡相关地质勘探资料,采用MIDAS/GTS有限元软件,对不同阶段采用不同支护方式时边坡的安全系数和位移特征及支护结构的内力做了详细分析。通过将模拟结果与实际监测结果进行对比,验证所选模型的参数是否合理,并进一步得出边坡和支护结构变形及内力分布的规律。 4、在原有合理模型参数的基础上,以边坡安全系数为主要目标函数,采用单一因素法对桩截面尺寸、桩锚固深度、桩埋设位置、相邻桩间净距、锚索锚固段长度、锚索方向角以及锚索预应力的大小等相关参数进行优化,最终使预应力锚索抗滑桩能提供最小的抵抗力或者发挥最大的安全系数,最后出相应的优化值。 5、总结并归纳本文的主要研究成果,同时指出文中的不足及有待进一步解决的问题,并在此基础上对预应力锚索抗滑桩桃支的技术的研究提出了展望。
[Abstract]:The prestressed anchor cable anti-slide pile support structure is a new type of support structure formed by the combination of prestressed anchor cable and anti-slide pile support structure. Its force and structure form are more reasonable, and it has the advantages of both prestressed anchor cable and anti-slide pile support structure.In practical engineering application, the strength of the material can be brought into full play, the economic and reasonable requirements can be met, and the overall stability of the slope can be greatly improved.At present, it has been more and more widely used in engineering practice, but it has not made a great breakthrough in theoretical research, and the theoretical research results lag far behind engineering practice.In this paper, based on the current research situation at home and abroad, combined with the related research results, a large-scale finite element analysis software MIDAS/GTS is used to deeply analyze the support effect of prestressed anchor cable anti-slide pile, and the simulation results are compared with the actual monitoring results.Verify that the selected model parameters are reasonable.In this paper, the safety factor of slope is taken as the main objective function, the cross-section dimension of anti-slide pile, the anchoring depth of pile, the embedding position of anti-slide pile, the net distance between piles and the length of anchoring section of Anchorage cable are discussed.The selection of anchor cable direction angle and anchor cable prestress is further optimized so that the pile, anchor cable and slope can be optimized under the condition of optimum parameters.Pre-stressed anchor-cable anti-slide pile can provide minimum resistance or maximum safety factor.The selection of relevant optimization parameters can provide a certain reference for similar high slope engineering.The work carried out in this paper mainly includes the following aspects:1. Through reading a large number of related documents, this paper mainly discusses the research status of anti-slide pile reinforcement technology of prestressed anchor cable from three aspects of test, calculation and optimization design.This paper briefly discusses the action mechanism of prestressed anchor cable and anti-slide pile, analyzes the differences between the two kinds of supporting structures when they are supported separately and jointly, and puts forward the optimum supporting method.2. The relevant theories of finite element and soil constitutive relation are introduced, the application conditions and scope of different constitutive models are summarized, and the constitutive models suitable for the actual situation of this paper are selected.At the same time, the research idea of finite element numerical simulation analysis and the model of slope and related supporting structure are introduced briefly.3. Based on the geological exploration data of high slope in K21,240 section of western Guangdong coastal highway, MIDAS/GTS finite element software is used.The safety factor and displacement characteristics of the slope and the internal force of the supporting structure are analyzed in detail when different supporting methods are adopted in different stages.By comparing the simulation results with the actual monitoring results, the parameters of the selected model are verified to be reasonable, and the law of deformation and internal force distribution of slope and supporting structure is obtained.4. On the basis of the original reasonable model parameters, taking the safety factor of slope as the main objective function, the single factor method is used to analyze the pile cross-section size, pile anchoring depth, pile embedding position, the net distance between adjacent piles, the length of anchor cable anchoring section.The relative parameters such as the direction angle of the anchor cable and the prestressing force of the anchor cable are optimized so that the anti-slide pile of the prestressed anchor cable can provide the minimum resistance or give play to the maximum safety factor. Finally the corresponding optimization value is given.5. The main research results of this paper are summarized and summarized. At the same time, the shortcomings of the paper and the problems to be solved are pointed out. On this basis, the prospect of the research on the technique of prestressed anchor cable anti-slide pile peach support is put forward.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU473.1

【参考文献】