【摘要】：面層是公路的重要組成部分，雙鋼輪振動(dòng)壓路機(jī)是面層壓實(shí)的主要設(shè)備，其壓實(shí)質(zhì)量與壓實(shí)效率關(guān)系到公路的使用質(zhì)量與建設(shè)成本。目前國(guó)產(chǎn)雙鋼輪振動(dòng)壓路機(jī)結(jié)構(gòu)、性能參數(shù)與國(guó)際水平保持同步，但施工工藝研究幾乎處于空白。因此論文對(duì)雙鋼輪振動(dòng)壓路機(jī)面層的壓實(shí)工藝進(jìn)行了實(shí)際工地調(diào)研統(tǒng)計(jì)、理論與試驗(yàn)研究，為雙鋼輪振動(dòng)壓路機(jī)壓實(shí)工藝的研究提供了參考。 首先，對(duì)壓實(shí)工藝中的壓實(shí)遍數(shù)、振動(dòng)壓實(shí)模式、振動(dòng)參數(shù)組合進(jìn)行了理論分析。指出通過能量等效方法可預(yù)估壓實(shí)遍數(shù)；前進(jìn)時(shí)開啟振動(dòng)比前進(jìn)后退均開啟振動(dòng)時(shí)的壓實(shí)效果好。提出了有效接觸寬度及重疊度兩個(gè)概念，指出有效接觸寬度及重疊度可確定振動(dòng)頻率與壓實(shí)速度的關(guān)系，并得出了壓實(shí)速度、振動(dòng)頻率、有效接觸寬度及重疊度之間的關(guān)系式。 其次，選取某國(guó)產(chǎn)壓路機(jī)與AC13型瀝青混凝土為研究對(duì)象，對(duì)有效接觸寬度進(jìn)行試驗(yàn)研究，并建立了其數(shù)學(xué)模型。通過對(duì)不同松鋪厚度下的材料沉降量觀測(cè)，發(fā)現(xiàn)在前兩遍壓實(shí)時(shí)，沉降量最大，第四遍以后，沉降量變化不明顯，并得出了沉降量隨壓實(shí)遍數(shù)變化的擬合方程。通過分析鋼輪與材料在壓實(shí)過程中的變化，得出了有效接觸寬度的數(shù)學(xué)模型，并根據(jù)該數(shù)序模型計(jì)算出了每一遍壓實(shí)時(shí)的有效接觸寬度。發(fā)現(xiàn)：有效接觸寬度隨振幅及松鋪厚度增大而增大；在壓實(shí)的初期，有效接觸寬度最大，，隨著壓實(shí)的進(jìn)行，有效接觸寬度逐漸減小，直到穩(wěn)定不變。 最后，以某高速公路施工標(biāo)段為依托，對(duì)某國(guó)產(chǎn)雙鋼輪振動(dòng)壓路機(jī)的壓實(shí)工藝進(jìn)行了系統(tǒng)研究。通過對(duì)材料進(jìn)行擊實(shí)試驗(yàn)，計(jì)算室內(nèi)試驗(yàn)的擊實(shí)能量和壓路機(jī)施加給材料的振動(dòng)能量，確定了壓實(shí)遍數(shù)；通過對(duì)比試驗(yàn)確定了振動(dòng)壓實(shí)方向及振動(dòng)參數(shù)組合；通過研究不同重疊度下壓實(shí)度變異系數(shù)的變化情況，確定了每遍壓實(shí)的合理速度范圍。 通過有效接觸寬度確定振動(dòng)頻率和壓實(shí)速度關(guān)系的方法，為壓實(shí)工藝的研究提供了新思路。
[Abstract]:The surface layer is an important part of highway, and the double-wheel vibratory roller is the main equipment for surface compaction. Its compaction quality and compaction efficiency are related to the use quality and construction cost of highway. In this paper, the surface compaction technology of double-wheel vibratory roller is investigated and analyzed on the actual site, and the theoretical and experimental research is carried out, which provides a reference for the study of the surface compaction technology of double-wheel vibratory roller.
Firstly, the theoretical analysis of compaction times, vibratory compaction mode and vibration parameter combination in compaction technology is carried out. It is pointed out that the energy equivalent method can be used to predict the compaction times, and the effect of opening vibration in advance is better than that of opening vibration in both forward and backward. The relationship between vibration frequency and compaction velocity can be determined by width and overlap degree, and the relationships among compaction velocity, vibration frequency, effective contact width and overlap degree are obtained.
Secondly, the effective contact width between a domestic road roller and AC13 asphalt concrete is tested and studied, and its mathematical model is established. Through the observation of material settlement under different thickness of loose pavement, it is found that the first two times of compaction are real-time, the settlement is the largest, and after the fourth time, the change of settlement is not obvious, and the settlement is obtained. By analyzing the change of the effective contact width between the steel wheel and the material in the process of compaction, the mathematical model of the effective contact width is obtained, and the real-time effective contact width is calculated according to the mathematical model. During the compaction period, the effective contact width decreases gradually until it is stable.
Finally, the compaction technology of a domestic twin-wheel vibratory roller is systematically studied on the basis of the construction tender section of a highway. The compaction energy of indoor test and the vibratory energy of the roller are calculated through the compaction test, and the compaction times are determined. By studying the variation coefficient of compaction degree under different overlap degree, the reasonable speed range of each compaction is determined.
The method of determining the relationship between vibration frequency and compaction velocity by effective contact width provides a new idea for the study of compaction technology.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U415.521

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