复杂地质条件下路堑高边坡稳定性分析
发布时间：2018-08-21 09:55
【摘要】：随着经济科技的发展和社会的进步,人民生活水平不断提高,交通等基础设施的建设得到了极大的发展。然而,我国幅员辽阔,地形地貌复杂多变,这就对交通设施的建设提出了较高的要求,特别是在复杂软岩地区道路的建设。为了保证所建道路的安全,需要对道路建设区域影响范围内的挖方或填方区域采取相应的加固措施,以防止道路施工及运营过程中,由于地质不良因素造成的工程事故或交通事故。虽然目前对于挖方和填方区域的加固技术已经相对成熟,但由于地质、气候等综合因素的影响,不同的区域需要有不同的加固形式。为了保证在道路施工期间其影响范围内加固支护结构的稳定性,需对该区域的结构进行变形观测,以便随时掌握边坡稳定性动态。该变形观测主要分为两个阶段:道路施工阶段和道路运营阶段,道路施工阶段主要保证道路施工的安全进行,而道路运营阶段主要用于评价支护结构的稳定性,防止支护结构在道路运营期出现危害道路运营安全的情况发生。本文对国内外相关的研究现状进行了简要的阐述,以郑州市中原路西延快速路工程某标段为例,主要对软岩区域道路施工中挖方支护段的边坡支护结构稳定性进行研究,采用现场实测和有限元软件(MIDAS软件)对比的方式,对支护结构在施工期的变形情况进行了综合分析。本文的主要研究内容如下:(1)基于该区域的地质勘察,对该施工段的挖方影响区域风险及变形情况进行了简要的分析,依据道路施工设计、工程测量规范和相关工程实例科学合理地制定了现场实测方案。(2)通过对现场实测数据的分析可知,挖方区域在道路边坡支护施工期间变形较大,随着施工结束变形逐渐区域稳定,说明边坡支护结构切实起到了对该区域软岩的加固作用,有效阻止了软岩变形对道路施工的影响,进而保证了道路运营期间的安全。(3)通过有限元(MIDAS)软件采用强度折减法,结合地质和挖方情况对该区域在支护施工阶段的变形情况进行模拟,得出了边坡变形的变化规律,边坡变形最大位置出现在坡脚或两级边坡交界处,这与现场实测结果基本吻合,对现场实测工作具有指导性作用。(4)采用有限元模拟和现场实测相结合的方式,切实做到了优化道路设计和施工方案,大大降低了软岩区域施工的风险,保证了道路施工安全,为以后类似工程的施工、设计和监测方案的确定提供了依据。
[Abstract]:With the development of economy and technology and the progress of society, the living standard of the people has been improved constantly, and the construction of infrastructure such as transportation has been greatly developed. However, China has a vast territory and complex landforms, which puts forward higher requirements for the construction of transportation facilities, especially in complex soft rock areas. In order to ensure the safety of the road, it is necessary to take appropriate reinforcement measures to the excavator or fill area within the impact area of the road construction area, so as to prevent the road construction and operation process. An engineering accident or traffic accident caused by poor geology. Although the reinforcement techniques for excavating and filling areas are relatively mature at present, due to the influence of comprehensive factors such as geology and climate, different regions need different reinforcement forms. In order to ensure the stability of reinforcement and support structure during road construction, the deformation observation of the structure in this area is needed in order to grasp the slope stability dynamics at any time. The deformation observation is mainly divided into two stages: road construction stage and road operation stage, the road construction stage mainly guarantees the safety of road construction, and the road operation stage is mainly used to evaluate the stability of supporting structure. To prevent the supporting structure from endangering the road operation safety during the road operation period. In this paper, the current situation of research at home and abroad is briefly described. Taking a certain section of Zhongyuan Road West extension Expressway Project in Zhengzhou City as an example, the stability of slope support structure of excavated support section in soft rock area is studied. The deformation of supporting structure during construction is analyzed synthetically by the comparison of field measurement and finite element software (MIDAS software). The main contents of this paper are as follows: (1) based on the geological survey of the region, the risk and deformation of the construction section affected by the excavations are analyzed briefly, and the road construction design is given. The engineering survey code and relevant engineering examples have scientifically and reasonably worked out the field measurement plan. (2) through the analysis of the field measured data, it can be seen that the excavated area has a large deformation during the construction of the road slope support. With the end of the construction deformation gradually stable in the region, it shows that the slope support structure has played a role in strengthening the soft rock in this area, and effectively prevented the soft rock deformation from affecting the road construction. Then the safety of the road operation period is ensured. (3) through the finite element (MIDAS) software, the strength reduction method is used to simulate the deformation of the area in the supporting construction stage combined with the geological and excavating conditions, and the variation law of the slope deformation is obtained. The maximum deformation of the slope occurs at the foot of the slope or at the junction of the two-grade slope, which is basically consistent with the field measurement results, which is instructive to the field measurement work. (4) the combination of finite element simulation and field measurement is adopted. It can effectively optimize the road design and construction scheme, greatly reduce the risk of construction in soft rock area, ensure the safety of road construction, and provide the basis for the construction, design and monitoring scheme of similar projects in the future.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.13
本文编号：2195347
[Abstract]:With the development of economy and technology and the progress of society, the living standard of the people has been improved constantly, and the construction of infrastructure such as transportation has been greatly developed. However, China has a vast territory and complex landforms, which puts forward higher requirements for the construction of transportation facilities, especially in complex soft rock areas. In order to ensure the safety of the road, it is necessary to take appropriate reinforcement measures to the excavator or fill area within the impact area of the road construction area, so as to prevent the road construction and operation process. An engineering accident or traffic accident caused by poor geology. Although the reinforcement techniques for excavating and filling areas are relatively mature at present, due to the influence of comprehensive factors such as geology and climate, different regions need different reinforcement forms. In order to ensure the stability of reinforcement and support structure during road construction, the deformation observation of the structure in this area is needed in order to grasp the slope stability dynamics at any time. The deformation observation is mainly divided into two stages: road construction stage and road operation stage, the road construction stage mainly guarantees the safety of road construction, and the road operation stage is mainly used to evaluate the stability of supporting structure. To prevent the supporting structure from endangering the road operation safety during the road operation period. In this paper, the current situation of research at home and abroad is briefly described. Taking a certain section of Zhongyuan Road West extension Expressway Project in Zhengzhou City as an example, the stability of slope support structure of excavated support section in soft rock area is studied. The deformation of supporting structure during construction is analyzed synthetically by the comparison of field measurement and finite element software (MIDAS software). The main contents of this paper are as follows: (1) based on the geological survey of the region, the risk and deformation of the construction section affected by the excavations are analyzed briefly, and the road construction design is given. The engineering survey code and relevant engineering examples have scientifically and reasonably worked out the field measurement plan. (2) through the analysis of the field measured data, it can be seen that the excavated area has a large deformation during the construction of the road slope support. With the end of the construction deformation gradually stable in the region, it shows that the slope support structure has played a role in strengthening the soft rock in this area, and effectively prevented the soft rock deformation from affecting the road construction. Then the safety of the road operation period is ensured. (3) through the finite element (MIDAS) software, the strength reduction method is used to simulate the deformation of the area in the supporting construction stage combined with the geological and excavating conditions, and the variation law of the slope deformation is obtained. The maximum deformation of the slope occurs at the foot of the slope or at the junction of the two-grade slope, which is basically consistent with the field measurement results, which is instructive to the field measurement work. (4) the combination of finite element simulation and field measurement is adopted. It can effectively optimize the road design and construction scheme, greatly reduce the risk of construction in soft rock area, ensure the safety of road construction, and provide the basis for the construction, design and monitoring scheme of similar projects in the future.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.13
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