【摘要】：預應力錨索是一種安裝在巖土體內(nèi)部的受拉索體結構,通過主動施加預應力,以實現(xiàn)限制變形和加固巖土體,提高穩(wěn)定性的目的。由于錨索具有經(jīng)濟、方便和加固效率較高的特點,現(xiàn)已被廣泛應用于邊坡工程、水利工程、結構抗浮工程和市政工程等領域。對于預應力技術而言,有效預應力是最為重要的一個參數(shù),它直接影響了被加固結構是否安全穩(wěn)定。目前工程上普遍采用雙控法對預應力張拉進行監(jiān)控,即以張拉荷載的控制為主,結合伸長量反推錨下有效預應力,兩者相互比較以達到校核的目的。然而,伸長量的計算方法卻一直少有人進行研究,各種規(guī)范中給出的計算公式也過于簡單,與實際情況偏差較大。本文針對以預應力錨索張拉伸長量的計算方法開展研究,主要工作包括:①以明德林問題為模型,分析了拉力型錨索的受力特點,指出其兩個界面上粘結應力分布的不均勻性,并推導了伸長量的計算公式和錨固段與自由段交界處脫粘段的長度。分析了壓力型錨索的受力特點,指出承載體位移對伸長量測量的影響,并推導出了相應的計算公式。②分析了預應力錨索錨孔的鉆鑿軌跡分布規(guī)律與特征,介分析了各種鉆孔表示方法和鉆孔計算方法的優(yōu)劣,選定了投影圖表示法和校正平均角法作為相應的表示方法和計算方法,為探討摩擦力的影響打下了基礎。③在已有研究工作的基礎上,針對預應力錨索在孔道中與孔道壁的接觸應力及其對摩阻力的影響進行了探討。④總結了現(xiàn)在廣泛使用的張拉工藝,分析了其中可能造成伸長量測量誤差的環(huán)節(jié),指出了其中的有些不足之處,并提出采用智能張拉工藝取代傳統(tǒng)張拉工藝,并提出了智能張拉工藝流程及智能張拉系統(tǒng)的技術框架。⑤結合云南蒙新高速第11合同段中的兩個邊坡錨固工程驗收報告進行了試算,并對得到的數(shù)據(jù)進行了初步的分析。
[Abstract]:Prestressed Anchorage cable is a kind of cable body structure which is installed in rock and soil body. The purpose of limiting deformation and strengthening rock and soil mass and improving stability can be achieved by applying prestressing force actively. Because of its economic convenience and high efficiency Anchorage cable has been widely used in slope engineering hydraulic engineering structural anti-floating engineering and municipal engineering. Effective prestressing is the most important parameter for prestressing technology, which directly affects the safety and stability of reinforced structures. At present, the double control method is widely used to monitor the prestress tension, that is, the tension load is mainly controlled and the effective prestressing force under the anchor is combined with the extension. The two methods are compared to each other in order to achieve the purpose of checking. However, the calculation method of elongation has been seldom studied, and the formulas given in various specifications are too simple and deviate from the actual situation. In this paper, the method of calculating the tensioning elongation of prestressed anchor cable is studied. The main work is as follows: 1 taking the Minderlin problem as the model, the stress characteristics of the tension type anchor cable are analyzed, and the inhomogeneity of the bond stress distribution on the two interfaces is pointed out. The calculation formula of elongation and the length of debonding section at the junction of anchoring section and free section are deduced. This paper analyzes the stress characteristics of pressure-type anchor cables, points out the influence of load-bearing displacement on the measurement of elongation, and deduces the corresponding calculation formulas. 2. The distribution law and characteristics of drilling track of prestressed anchor holes are analyzed. In this paper, the advantages and disadvantages of various borehole representation methods and borehole calculation methods are analyzed, and the projection map representation method and the correction average angle method are selected as the corresponding representation and calculation methods. It lays a foundation for the discussion of the influence of friction. 3 on the basis of existing research work, In this paper, the contact stress of prestressed anchor cable in the channel and its influence on friction resistance are discussed. (4) the tensioning technology which is widely used now is summarized, and the links which may cause the measuring error of elongation are analyzed. Some shortcomings are pointed out, and the intelligent tensioning process is proposed to replace the traditional tensioning process. Finally, the technical framework of intelligent tensioning process and intelligent tensioning system is put forward. 5 combined with the acceptance report of two slope anchoring projects in the 11th contract section of Yunnan Mengxin Expressway, the preliminary analysis of the obtained data is made.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU476;U416.14

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本文編號：2289845