锚杆受力机理的试验研究

发布时间：2018-07-05 11:20

本文选题：拉力型锚杆 + 分布式承载体·扩大头锚杆　；参考：《广东工业大学》2014年硕士论文

【摘要】：迄今为止,锚固技术在工程中的应用已经有一百多年的历史,岩土锚固已经成为岩土工程领域的重要分支,特别是目前经济建设要求加快交通基础设施建设,因而需修建大量铁路,公路隧道；同时,城市人口数量激增,城市地域不断扩大,城市地下空间的开发利用势在必行,在我国的岩土工程建设中采用锚杆进行锚固具有相当广阔的应用前景。相比于锚杆在工程中的广泛应用,对锚杆理论的研究却显得滞后,工程中因为锚固问题而导致的事故时有发生。因此,有必要对锚杆锚固系统的工作机理进行研究,以便为工程中锚杆的使用提供理论指导。本文通过对传统拉力型锚杆以及新型分布式承载体扩大头锚杆进行内力测试,分析这两种锚杆的受力机理情况,分别通过不同加载方式,以及选择不同应变片,对锚杆内力测试进行研究,本文主要做了以下几个方面的工作： 1、对拉力型锚杆受力机理以及特性进行了理论分析,采用不同的传感器对拉力型锚杆进行内力测试,同时记录锚杆锚头位移,对测试数据进行处理,根据得出结果绘制出拉力型锚杆的轴力分布曲线、不同部位,锚杆轴力随荷载变化曲线、锚杆侧阻力分布曲线,对这些曲线进行分析,得出拉力型锚杆的受力机理。 2、介绍分布式承载体·扩大头锚杆的特点,采用不同的加载方式对分布式承载体·扩大头锚杆进行内力测试,同时记录锚杆锚头位移,对测试数据进行处理,根据得出的结果绘制出拉力型锚杆的轴力分布曲线。通过对曲线进行分析,得出分布式承载体·扩大头锚杆的受力机理。 3、从两个不同的角度对锚杆内力测试进行了研究,一个为安装不同的传感器用同一种加载方式进行试验,另一个为安装同一种传感器用不同的加载方式进行试验。 4、将锚杆最大荷载下的侧阻力与行业规范取值相对比,验证了锚杆锚固段灌浆体与周边地层之间极限粘结强度取值范围。本文两组试验均为工程现场试验,一方面试验成果可以工程中锚杆的使用提供理论指导；另一方面,通过不同的角度对锚杆内力测试进行研究,为工程界锚杆内力测试提供了一定程度上的参考。
[Abstract]:Up to now, Anchorage technology has been used in engineering for more than 100 years, and geotechnical anchoring has become an important branch of geotechnical engineering, especially in the current economic construction, which requires speeding up the construction of traffic infrastructure. Therefore, it is necessary to build a large number of railway and highway tunnels. At the same time, the population of the city is increasing rapidly, and the urban area is constantly expanding, so it is imperative to develop and utilize the underground space in the city. Anchorage with anchor rod has a broad application prospect in geotechnical engineering construction in China. Compared with the extensive application of anchor rod in engineering, the research on bolt theory is lagging behind, and accidents caused by anchoring problems occur frequently in engineering. Therefore, it is necessary to study the working mechanism of Anchorage system in order to provide theoretical guidance for the use of Anchorage in engineering. In this paper, the internal force of the traditional tension anchor rod and the new distributed load-bearing anchor rod with enlarged head is tested, and the stress mechanism of the two kinds of anchors is analyzed, and the different strain gauges are selected through different loading modes, respectively. The main work of this paper is as follows: 1. The mechanical mechanism and characteristics of tension anchor are theoretically analyzed, and different sensors are used to test the internal force of tension anchor. At the same time, the displacement of anchor head is recorded, and the test data are processed. According to the result, the axial force distribution curve of tension anchor rod is drawn. Through the analysis of these curves, the mechanical mechanism of the tension anchor is obtained. 2. The characteristics of the extended head anchor of the distributed load-bearing body are introduced, and the internal force of the expanded head bolt of the distributed bearing body is tested by different loading methods. At the same time, the displacement of anchor head is recorded, the test data are processed, and the axial force distribution curve of tension anchor is drawn according to the obtained results. Through the analysis of the curve, the stress mechanism of the anchor rod with the enlarged head of the distributed bearing body is obtained. 3. The internal force test of the anchor rod is studied from two different angles. One used the same loading mode to install different sensors, the other used different loading modes to install the same sensor. The range of ultimate bond strength between grouting body and surrounding strata is verified. On the one hand, the test results can provide theoretical guidance for the use of anchor rod in engineering; on the other hand, through different angles, the internal force test of anchor rod is studied. It provides some reference for the internal force test of anchor rod in engineering field.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU476

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