本文關鍵詞： 風沙環(huán)境 混凝土 沖蝕磨損 沖蝕機理 評價方法　出處：《內蒙古工業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：隨著我國經(jīng)濟建設的發(fā)展,混凝土結構應用日益廣泛,結構在惡劣環(huán)境(比如沙塵暴、嚴寒、霜凍、酸、堿和鹽等)中遭受侵蝕或者腐蝕作用,使得結構耐久性降低,服役期限縮短,致使結構存在安全隱患,影響人們的正常使用。本文主要研究區(qū)域為內蒙古中西部沙漠地區(qū),該地區(qū)公路和橋梁等混凝土設施長期受到沙塵暴自然災害的影響,導致結構的耐久性和安全性降低,嚴重影響結構的使用壽命。本文在研究內蒙古中西部地區(qū)風沙環(huán)境的特點和混凝土物理、力學性能和沖蝕接觸力學行為及其理論的基礎上,采用氣流挾沙噴射試驗方法,研究了混凝土的沖蝕磨損量或沖蝕率在不同強度和不同風沙環(huán)境沖蝕參數(shù)下的關系,得出混凝土的沖蝕規(guī)律和沖蝕機理,結合混凝土和風沙環(huán)境特征,提出了一種混凝土的沖蝕磨損量評價方法,該方法可評價混凝土受沖蝕磨損的程度,使得試驗結果更具有實際意義。具體內容如下:1.本文對內蒙古中西部地區(qū)的風沙氣象環(huán)境進行了大量的研究,分析其特點后選擇風沙沖蝕參數(shù)。結合內蒙古中西部的氣候特點設計混凝土的抗沖蝕試驗工況,設計了三組不同強度等級的混凝土,進行混凝土在不同強度和不同風沙環(huán)境沖蝕參數(shù)的對比試驗研究。2.采用氣流挾沙噴射法進行混凝土抗沖蝕性能的試驗研究,對研究結果進行統(tǒng)計分析,結果表明:(1)同強度混凝土的沖蝕率在相同條件下隨著風沙流沖蝕角度的增大而增大,90°時達到最大;(2)同強度混凝土的沖蝕率在相同條件下隨著風沙流沖蝕速度的提高而增大,并且二者近似成指數(shù)關系;(3)同強度混凝土的沖蝕率在相同條件下隨著下沙率的增大呈先增大后減小的趨勢;(4)試驗表明混凝土在沖蝕過程中沒有明顯的孕育期,但是有上升期和穩(wěn)定期。通過SEM掃描電鏡觀察了沖蝕損傷部位表面形貌,其破壞機理表現(xiàn)為:在低沖蝕角下破壞機制表現(xiàn)為類似表面劃傷破壞作用;在高沖蝕角下破壞機制表現(xiàn)為沖擊壓痕破碎作用。3.通過建立風沙流粒子沖蝕磨損力學模型,在建立的力學模型基礎上進行風沙流作用下混凝土沖蝕磨損力學行為及其理論計算分析。4.本文提出了一種混凝土在風沙環(huán)境下抗沖蝕磨損程度的評價方法以及相應的評價公式,利用該評價計算公式分析了混凝土沖蝕磨損重量同沖蝕速度和沖蝕角度之間的關系,并把評價計算公式結果與試驗結果進行了對比,證實了評價公式的可行性和可靠性。
[Abstract]:With the development of economy in China, the application of concrete structure is more and more widely, the structure in the harsh environment (such as sandstorm, cold, frost, acid, alkali and salt) in erosion or corrosion, the durability of the structure is reduced, the service period is shortened, resulting in structure safety hazards, affecting the normal use of the people. In this paper, the main research area for the western Inner Mongolia desert area, the area has long been the concrete facilities such as roads and bridges of sandstorm natural disasters, leading to the safety and durability of structure is reduced, seriously affect the structure of life. Based on the characteristics of the wind environment in central and western regions of Inner Mongolia and the physical and mechanical properties of concrete and foundation erosion mechanical behavior and contact theory, the sediment air injection test method, studied the concrete erosion or erosion rate in different intensity and The relationship between wind erosion parameters under the law, erosion and erosion mechanism of concrete is obtained, combining with the environmental characteristics of sand and concrete, put forward an evaluation method for the erosion wear of concrete, this method can evaluate the degree of erosion of concrete, the test result has more practical significance. The specific contents are as follows: 1. in the Midwest the sandstorm of Inner Mongolia meteorological environment made a lot of research and analysis of the characteristics of wind erosion parameters. After the selection of anti erosion test design of concrete combined with the climate characteristics of central and Western Inner Mongolia, the design of the three groups of different strength grade of concrete, the test of concrete in different intensity and different wind erosion parameters test by.2. sediment air injection method for concrete anti erosion performance, statistical analysis, the research results show that: (1) the same The erosion rate of concrete strength under the same conditions increase with the erosion angle of sand flow and 90 degrees maximum; (2) with the rate of erosion strength of concrete under the same conditions with the increase of erosion of sand flow rate increased, and the two approximate exponential relationship; (3) erosion with strength of concrete the rate under the same conditions with the increase of Xiasha rate decreased; (4) test showed that the concrete in erosion process has no obvious incubation period, but the rising phase and stable phase. The erosion damage parts of the surface morphology was observed by SEM scanning electron microscope, the failure mechanism is: in the low erosion angle of failure mechanism showed similar surface scratch damage; at high angle erosion damage mechanism for impact indentation crushing effect through the establishment of the.3. sand particle erosion mechanics model, based on the established mechanical model Based on the analysis of.4. this paper presents a concrete in sandy environment erosion degree evaluation method and the evaluation formula of sand flow under the action of concrete erosion mechanics behavior and theory, using the formula of the evaluation and analysis of the relationship between the concrete erosion weight with the erosion rate and erosion angle, and the evaluation the calculated results were compared with the experimental results, proved the feasibility and reliability evaluation formula.

【學位授予單位】：內蒙古工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU528

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本文編號：1469517