孔道弯曲情况下压力分散型锚索锚固段的受力机理研究

发布时间：2018-09-06 11:09

【摘要】：压力分散型锚索技术自研发成功以来,作为一种最有效的加固支护技术,广泛应用于铁路、公路、水利、工业与民用建筑等工程中。它能够充分调动岩土体的自承潜力,利用并调节岩土的自身强度来达到提高自稳能力的效果。但由于其问世时间尚短,设计计算方法还不成熟,理论研究远落后于工程应用,有诸多问题需做进一步详细研究。例如,由于自然因素和技术因素,锚索在工程施工过程中极易发生孔道弯曲状况。因此为得到锚索更切合实际的受力情况,对孔道弯曲情况下锚索的受力机理的研究作为一个全新的课题更应引起关注。为得到锚索更切合实际的受力情况,本文分别通过模型试验与数值模拟研究分别得到孔弯和和孔直条件下压力分散型预应力锚索的轴应力以及注浆体与围岩孔壁间剪应力的分布曲线,对提高我国压力分散型锚索的相关锚固理论及实际应用具有指导意义。本文完成的主要工作有:(1)分析总结了锚索孔道发生弯曲的原因及危害。(2)通过模型试验与模拟分析得到了孔直和孔弯锚索在分级张拉荷载下的受力情况,主要对锚固段的轴应力以及注浆体与周边岩体剪应力的分布规律进行分析研究。(3)通过分析结果曲线,得到:孔弯锚索的轴应力大于孔直锚索的轴应力且作用范围更广;孔弯锚索内侧剪应力大于孔直剪应力大于孔弯外侧剪应力。(4)相关结论为压力分散型锚索的进一步理论及试验研究及实际施工提供相关依据。
[Abstract]:Since its successful development, Pressure-dispersed anchor cable technology has been widely used in railway, highway, water conservancy, industrial and civil engineering as one of the most effective reinforcement and support technologies. The time is short, the design and calculation methods are not mature, the theoretical research is far behind the engineering application, there are many problems to be further studied in detail. For example, due to natural and technical factors, the bending of the anchor cable in the engineering construction process is very easy to occur. The research on the mechanism of anchor cable under anchorage should be paid more attention as a brand-new subject. In order to get the more practical stress of anchor cable, the axial stress of Pressure-dispersed prestressed anchor cable under the conditions of hole bending and hole straightening and the shear stress between grouting and surrounding rock hole wall are obtained by model test and numerical simulation respectively. The main work done in this paper is as follows: (1) Analysis and summary of the causes and hazards of the bending of the anchor cable passage. (2) Through model test and simulation analysis, the forces acting on the straight and curved anchor cable under the graded tension load are obtained. The axial stress of anchorage section and the distribution of shear stress between grouting body and surrounding rock mass are analyzed and studied. (3) By analyzing the curves, it is found that the axial stress of curved anchor cable is greater than that of straight anchor cable and the action range is wider; the shear stress inside curved anchor cable is greater than that of direct shear stress outside curved anchor cable. (4) (3) The relevant conclusions provide the relevant basis for further theoretical and experimental research and practical construction of Pressure-dispersed anchor cables.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU476

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