本文選題：GFRP錨桿 + 正交實(shí)驗(yàn)　； 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：錨固技術(shù)經(jīng)過(guò)一個(gè)多世紀(jì)的發(fā)展,已經(jīng)成為巖土工程領(lǐng)域最重要的支護(hù)手段之一。錨桿是錨固體系中最重要的結(jié)構(gòu)體,其物理力學(xué)性質(zhì)對(duì)巖土體穩(wěn)定性和耐久性起著十分重要的作用。普通鋼錨桿以其優(yōu)良的物理力學(xué)特性被廣泛應(yīng)用,尤其在基坑工程、隧道工程、邊坡工程、地下工程、港口與壩體工程、支擋結(jié)構(gòu)、橋臺(tái)加固工程等領(lǐng)域。然而,工程實(shí)踐發(fā)現(xiàn),鋼錨桿作為常見結(jié)構(gòu)卻存在自重大、運(yùn)輸和安裝困難、耐腐蝕性較差等缺陷,這些缺陷影響了其在某些領(lǐng)域的應(yīng)用。GFRP(Glass Fiber Reinforced Polymer)錨桿是一種新型材料錨桿具有質(zhì)量輕、強(qiáng)度高、耐電磁、抗腐蝕性好、可加工性好、抗疲勞性能好等特點(diǎn)。GFRP錨桿替代普通鋼錨桿用于支護(hù)工程,可在克服鋼錨桿某些方面的不足,必將推動(dòng)錨固技術(shù)的新發(fā)展以及新應(yīng)用。目前,國(guó)內(nèi)外已有不少GFRP錨桿成功應(yīng)用的實(shí)例,但是對(duì)玻璃纖維錨桿的理論研究相對(duì)較少,為加快玻璃纖維錨桿技術(shù)推廣,應(yīng)加強(qiáng)其在隧道工程、邊坡工程及地下工程等領(lǐng)域的研究,玻璃纖維錨桿的理論研究概括起來(lái)主要兩個(gè)方面:一是宏觀方面,主要體現(xiàn)在錨固體系加固后,巖土體承載力、巖土體物理力學(xué)參數(shù)等錨固效果方面的研究;另一方面微觀角度,從錨固體系荷載傳遞途徑出發(fā),研究荷載作用下沿錨固長(zhǎng)度的應(yīng)力、應(yīng)變分布及傳遞規(guī)律,重點(diǎn)研究錨桿桿體與注漿體、注漿體與巖土體界面上物理力學(xué)特性,以上兩個(gè)界面往往是控制錨固體系正常工作的關(guān)鍵因素。首先通過(guò)對(duì)錨固機(jī)理論研究,研究玻璃纖維錨桿現(xiàn)階段的錨固機(jī)理,分析玻璃纖維錨桿粘結(jié)應(yīng)力的分布規(guī)律、分布函數(shù)。通過(guò)對(duì)玻璃纖維錨桿物理力學(xué)性能的研究,確定玻璃纖維錨桿的破壞形態(tài)。通過(guò)對(duì)玻璃纖維錨桿進(jìn)行現(xiàn)場(chǎng)正交實(shí)驗(yàn),研究錨固體系中的錨固直徑、錨桿直徑、錨固長(zhǎng)度、砂漿強(qiáng)度等因素對(duì)錨固力的影響,并通過(guò)極差分析、方差分析確定影響錨固體系力學(xué)指標(biāo)的關(guān)鍵因素,通過(guò)回歸分析建立玻璃纖維錨桿承載力、平均粘結(jié)應(yīng)力與關(guān)鍵因素之間的函數(shù)關(guān)系,為類似工程錨桿重要物理參數(shù)提供借鑒。結(jié)合現(xiàn)有的理論成果和工程實(shí)踐,研究錨桿錨固機(jī)理、錨固體系的破壞形態(tài)。利用成熟軟件Flac3D模擬實(shí)際雙側(cè)壁導(dǎo)坑法施工,通過(guò)對(duì)圍巖體應(yīng)力、應(yīng)變、位移等指標(biāo)的檢驗(yàn),評(píng)價(jià)玻璃纖維錨桿作為系統(tǒng)錨桿、臨時(shí)錨桿的可行性。
[Abstract]:Anchorage technology has become one of the most important supporting methods in geotechnical engineering field after more than a century's development. Anchor rod is the most important structure in anchoring system, and its physical and mechanical properties play an important role in the stability and durability of rock and soil. Common steel anchors are widely used for their excellent physical and mechanical properties, especially in the fields of foundation pit engineering, tunnel engineering, slope engineering, underground engineering, port and dam body engineering, retaining structure, bridge abutment reinforcement and so on. However, it has been found in engineering practice that the steel anchor rod, as a common structure, has some defects, such as heavy weight, difficult transportation and installation, poor corrosion resistance, etc. These defects affect its application in some fields. GFRP Glass Fiber Reinforced Polymer) bolt is a new type of material bolt with light weight, high strength, electromagnetic resistance, good corrosion resistance and good processability. GFRP anchors can be used in support engineering instead of common steel anchors, which can overcome the shortcomings of some aspects of steel anchors and will promote the new development and application of anchoring technology. At present, there are many examples of successful application of GFRP bolt at home and abroad, but the theoretical research on glass fiber bolt is relatively few. In order to speed up the popularization of glass fiber bolt technology, it should be strengthened in tunnel engineering. In the field of slope engineering and underground engineering, the theoretical research of glass fiber bolt is summarized in two aspects: one is macro aspect, which is mainly reflected in the bearing capacity of rock and soil after the reinforcement of anchor system. On the other hand, from the microscopic point of view, the stress, strain distribution and transfer law along the Anchorage length are studied from the point of view of the load transfer way of the Anchorage system. Emphasis is placed on the physical and mechanical properties of the bolt body and grouting body and the interface between the grouting body and the rock and soil. The above two interfaces are often the key factors to control the normal operation of the anchoring system. Firstly, the anchoring mechanism of glass fiber bolt is studied by studying the theory of anchoring machine, and the distribution law and distribution function of bond stress of glass fiber bolt are analyzed. Through the study of the physical and mechanical properties of the glass fiber bolt, the failure form of the glass fiber bolt is determined. Based on the field orthogonal experiment of glass fiber bolt, the influence of anchoring diameter, anchor rod diameter, anchor length and mortar strength on the anchoring force is studied. The key factors affecting the mechanical index of anchoring system are determined by variance analysis. The functional relationship between the bearing capacity of glass fiber anchor rod, the average bond stress and the key factors is established by regression analysis, which provides a reference for the important physical parameters of anchor rod in similar projects. Combined with the existing theoretical results and engineering practice, the anchoring mechanism of anchor rod and the failure mode of anchor system are studied. By using the mature software Flac3D to simulate the construction of the actual double-side wall guide pit method, the feasibility of the glass fiber bolt as the system anchor and the temporary anchor is evaluated by checking the stress, strain and displacement of the surrounding rock mass.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.7

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 楊柳,羅迎社,許建民,季忠;20號(hào)鋼熱拉伸流變特性的研究(Ⅰ)[J];湘潭大學(xué)自然科學(xué)學(xué)報(bào);2004年02期

相關(guān)碩士學(xué)位論文 前1條

1 張常洲;預(yù)應(yīng)力錨板墻支護(hù)技術(shù)研究與應(yīng)用[D];重慶大學(xué);2006年

，

本文編號(hào)：1978498