锚索抗滑桩外锚头失效及修复强化技术研究——以川藏公路二郎山1#滑坡治理工程为例
文献类型：学位论文
| 作者 | 郭绍平 |
| 学位类别 | 硕士 |
| 答辩日期 | 2014 |
| 授予单位 | 中国科学院研究生院 |
| 授予地点 | 北京 |
| 导师 | 王全才 |
| 关键词 | 预应力锚索 锚头 失效 修复 强化 |
| 其他题名 | Research on the failure and repair reinforcement technology of anchor head on pre-stress anchored pile——Treatment engineering of Erlang mountain 1# landslide in Sichuan-Tibet highway as an example |
| 学位专业 | 防灾减灾工程及防护工程 |
| 中文摘要 | 预应力锚固工程在国内外大量防减灾工程中发挥着越来越重要的作用。其“时效问题”越来越突出，出现了大量锚固工程失效现象，并随之引起了一系列严重后果。如何能够修复破坏失效的锚索使其重新发挥作用已经成为灾害防治技术领域重要课题之一。 本文研究以川藏公路二郎山1#滑坡治理工程为例，借助野外现场调研、室内资料收集整理等手段，对预应力锚索失效模式进行分类，并对引发失效的主要因素分析研究；在对比已有的预应力锚固工程失效修复措施的基础上，针对预应力锚索抗滑桩外锚头破坏失效现象设计一套合理可行的修复技术方案，并对单一夹片式锚头进行结构形式创新，通过现场锚索锚头拉拔实验，测定新型锚头最佳设计参数，最后探讨预应力锚索外锚头的工后检测与维护技术及其安全性评估方法。 通过以上研究得出以下几点结论： （1）预应力锚索失效主要概括为六种破坏模式与六种失效类型。诱发失效的因素除最重要的腐蚀因素外其他具体因素包括：水、大气环境、地质条件、震动与荷载、异常外动力作用、自身结构形式、材料质量、施工质量及一些特殊因素。 （2）针对像二郎山1#滑坡这样预应力锚索抗滑桩外锚头失效的情况，可以通过在桩背开挖，截断失效锚索的索体后重新接长张拉的方法以及一系列配套实施辅助工程，恢复失效锚索预应力，并达到对坡体补强加固的效果。 （3）针对现有单一夹片式锁定的缺陷，在夹片锁定的基础上，将外露钢绞线端采取用高强锚固胶粘结钢套筒的方式形成二重锁定，可大大改善锚头锁固效果。实验得出最佳钢套筒参数为：长5cm、内径20mm、外径25mm，其对单根钢绞线可提供约50KN的附加锁定力。 （4）通过预应力锚索锚头工后直观检查与锚头、结构物的变形监测可以及时发现问题，及时作出相应的维护措施。采用基于模糊等价关系的动态聚类方法对外锚头的安全耐久性进行分类评估，可以判断锚头的安全状态，为锚头的维护和修复提供依据。 本论文的研究顺应了当今预应力锚固技术的发展需求，具有一定的理论意义，同时也为今后锚索失效修复技术的研究提供一定的参考，为以后相类似的工程处置提供依据，具有很强的现实意义。 |
| 英文摘要 | Pre-stressed anchoring engineering plays a more and more important role in large number of disaster reduction engineering all around the world. But a large number of anchoring engineering failure phenomenon appeared along with time effect problem, and then caused a series of serious consequences. So how to repair the failed anchor cable to make it to work has become one of the important subject of disaster prevention and control technical field. This paper study on Erlang mountain 1# landslide engineering in Sichuan-Tibet highway as an example. To study the failure mode and the inducing factors of pre-stressed anchor cable with the help of field site investigation and indoor data collecting. On the basis of comparing the existing repair measures of failed pre-stressed anchoring engineering, design a set of feasible technology to repair the failed anchor head on pre-stress anchored pile. And to innovate the single chip anchor head structure to form a new type of anchor head, and determine its optimal design parameters through the cable drawing experiments. Finally discusses the detection and maintenance technology and the safety assessment methods of anchor head. The above study come to the following understanding: (1) The failure of pre-stressed anchor cable can be summarized as six kinds of failure modes and six types of failure. In the influence factors, the corrosion is one of the most important factors. The other specific factors include: water, atmospheric environment, geological conditions, vibration and load, abnormal outside power, structural form, material quality, construction quality, and some special factors. (2) For the failed anchor head on pre-stress anchored pile such as in Erlang mountain 1# landslide, it can be repaired by a series of measures, including excavating the slope behind the pile, cutting off the failed anchor cable, tensioning again after connecting, and a series of matching aided engineering. In this process, the slope has also been reinforced. (3) The existing clamping piece lock has its defects. In order to improve the anchor head locking effect, a steel sleeve is bonded on the steel strand end by high strength anchor adhesive, forming the secondary lock. The optimum parameters of the steel sleeve by the experiment as following: 5 cm long, 20 mm inside diameter, outside diameter 25 mm. It can provide additional locking force about 50KN for single steel strand. (4) After the pre-stressed anchor rope’s construction, some problems can be found in advance through visual inspection and anchor head, structure deformation monitoring. The corresponding safeguard measures should be done in a timely manner. Using a dynamic clustering method biased on the fuzzy equivalence relation, to classify and assess the safety and durability of anchor head, can determine the safety of the anchor head and provide a basis for the maintenance and repair of anchor head. The research of this paper complied with the requirement of the pre-stressed anchorage technology. It has certain theoretical significance. And at the same time it also provide certain reference for the repair technology research of failed anchor cable, and provide the basis for later similar engineering disposal. It has very strong practical significance. |
| 语种 | 中文 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/8012]  |
| 专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 |
| 推荐引用方式 GB/T 7714 | 郭绍平. 锚索抗滑桩外锚头失效及修复强化技术研究——以川藏公路二郎山1#滑坡治理工程为例[D]. 北京. 中国科学院研究生院. 2014. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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