隧道棄渣填筑高速公路路基施工與檢測技術(shù)研究
發(fā)布時(shí)間：2018-10-15 10:22
【摘要】：隨著西部大開發(fā),山區(qū)的高速公路建設(shè)發(fā)展迅速,建設(shè)中橋隧所占的比例日益增加,其中所產(chǎn)生的隧道棄渣也越來越多,大多數(shù)處理的方法就是簡單的堆砌。這種粗放型的做法,將本可以利用的隧道棄渣未加利用而直接拋棄,填筑路基時(shí)又缺乏筑路材料,反而需在當(dāng)?shù)卮罅块_采筑路材料,這不僅破壞自然環(huán)境和生態(tài)平衡,而且浪費(fèi)社會資源,增加了建設(shè)費(fèi)用。若利用隧道棄渣,并經(jīng)破碎等工藝處理后作路基填料,可實(shí)現(xiàn)材料的就地取材,也可提高路基的強(qiáng)度及穩(wěn)定性。隧道棄渣作路基填料時(shí),檢測其壓實(shí)度是否符合要求就顯得尤為重要。本文首先分析了隧道棄渣的工程特性;其次分析了在壓實(shí)過程中隧道棄渣的破碎性及其影響因素;同時(shí)進(jìn)一步闡明了影響隧道棄渣壓實(shí)度的因素,分析出傳統(tǒng)壓實(shí)度檢測方法的一些不足。本文通過借鑒國內(nèi)外對棄渣填料壓實(shí)度檢測研究成果的基礎(chǔ)上,建立了“振動(dòng)機(jī)—路基填料”模型并提出壓實(shí)度連續(xù)檢測系統(tǒng),該方法有利于壓實(shí)質(zhì)量的實(shí)時(shí)控制。本文對壓實(shí)度連續(xù)檢測系統(tǒng)進(jìn)行了理論分析研究及現(xiàn)場試驗(yàn),證明了該方法的可靠性、準(zhǔn)確性。主要得出以下幾個(gè)結(jié)論:(1)在我國高速公路建設(shè)中,規(guī)范中壓實(shí)度的檢測方法只適用于填土路基,而對于填石路基的檢測有很大缺陷,在本文研究試行一種新的檢測方法,即壓實(shí)度連續(xù)檢測技術(shù)。該檢測方法能夠方便利用快速檢測出路基的壓實(shí)質(zhì)量且實(shí)用性強(qiáng)。(2)提出由加速度傳感器、數(shù)據(jù)采集儀、計(jì)算機(jī)及數(shù)據(jù)分析系統(tǒng)組成的壓實(shí)度連續(xù)檢測系統(tǒng)進(jìn)行的壓實(shí)度連續(xù)檢測技術(shù)。通過采集加速度的振動(dòng)信號并對其進(jìn)行分析處理,其結(jié)果能夠反映出路基整體的壓實(shí)程度。在本文中也證明了該方法準(zhǔn)確可行。(3)通過對采集壓路機(jī)加速度激振信號分析證明:路基壓實(shí)度是與路基填料的剛度成正相關(guān)、與其阻尼成負(fù)相關(guān)的;而振動(dòng)壓路機(jī)垂直的振動(dòng)加速度與路基填料的剛度也是成正相關(guān)、與其阻尼也是成負(fù)相關(guān)的。通過本文理論分析的結(jié)果基礎(chǔ)上,建立起“振動(dòng)壓路機(jī)—路基”模型仿真模擬,結(jié)果表明路基填料壓實(shí)度的確與振動(dòng)壓路機(jī)垂直的振動(dòng)加速度成正相關(guān)關(guān)系。(4)因隧道棄渣填料屬于散體材料,具有破碎性質(zhì),我們以第一種級配進(jìn)行三種壓實(shí)工藝的對比,確定工藝Ⅰ的施工方法對路基壓實(shí)的效果最為合理。(5)提出用振動(dòng)壓路機(jī)的振動(dòng)加速度有效值表示壓實(shí)填料的壓實(shí)度。本文得到三種棄渣填料在級配不同、最佳含水量不同的條件下,壓實(shí)度與振動(dòng)輪加速度有效值之間的回歸公式和相關(guān)系數(shù)。
[Abstract]:With the development of the western region, the highway construction in the mountainous area is developing rapidly, the proportion of bridge and tunnel is increasing day by day, and more tunnel waste is produced, most of the disposal methods are simply stacking. In this extensive way, the waste residue of the tunnel that could have been used is discarded directly, and the roadbed is filled with no road construction materials. Instead, it requires extensive mining of road building materials in the local areas, which not only destroys the natural environment and ecological balance, but also causes a great deal of damage to the natural environment and the ecological balance. And waste social resources, increased the cost of construction. If the waste residue is used as subgrade filler after crushing, the material can be obtained locally, and the strength and stability of roadbed can also be improved. It is very important to test whether the compaction degree meets the requirement when the slag is used as the subgrade filler. In this paper, the engineering characteristics of tunnel slag are analyzed at first, secondly, the fragmentation of tunnel slag and its influencing factors are analyzed, and the factors that influence the compaction degree of tunnel slag are expounded. Some shortcomings of traditional compaction measurement methods are analyzed. Based on the domestic and foreign research results on the compaction degree of waste slag filler, the model of "vibration moving-subgrade packing" is established and a continuous compaction measurement system is put forward. This method is beneficial to the real-time control of compaction quality. In this paper, the theoretical analysis and field test of the continuous compaction measurement system are carried out, and the reliability and accuracy of the method are proved. The main conclusions are as follows: (1) in the highway construction of our country, the compaction degree detection method in the code is only applicable to the subgrade filled with earth, but there are great defects in the detection of the subgrade filled with stone. In this paper, a new testing method is studied and tried. That is compactness continuous testing technology. This method can be used to quickly detect the compaction quality of roadbed and has strong practicability. (2) the acceleration sensor and data acquisition instrument are proposed. The continuous compactness testing technology of the compactness continuous testing system composed of computer and data analysis system. By collecting the vibration signal of acceleration and analyzing it, the result can reflect the compaction degree of subgrade as a whole. The method is also proved to be accurate and feasible in this paper. (3) by analyzing the acceleration excitation signal of road roller, it is proved that the compaction degree of roadbed is positively correlated with the stiffness of subgrade filler and negatively correlated with its damping. The vertical vibration acceleration of the vibratory roller is also positively correlated with the stiffness of the subgrade filler and negatively correlated with its damping. Based on the results of theoretical analysis in this paper, a model of "vibratory road roller subgrade" is established. The results show that the compaction degree of subgrade filler is positively related to the vertical vibration acceleration of the vibratory roller. (4) because the waste material of the tunnel belongs to the bulk material and has the property of breaking, we use the first gradation to compare the three compaction processes. It is suggested that the effective value of vibration acceleration of vibratory roller can be used to express the compaction degree of compacted filler. In this paper, the regression formula and correlation coefficient between the compaction degree and the effective value of vibration wheel acceleration are obtained under the conditions of different gradation and different optimum moisture content.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U416.1
本文編號：2272238
[Abstract]:With the development of the western region, the highway construction in the mountainous area is developing rapidly, the proportion of bridge and tunnel is increasing day by day, and more tunnel waste is produced, most of the disposal methods are simply stacking. In this extensive way, the waste residue of the tunnel that could have been used is discarded directly, and the roadbed is filled with no road construction materials. Instead, it requires extensive mining of road building materials in the local areas, which not only destroys the natural environment and ecological balance, but also causes a great deal of damage to the natural environment and the ecological balance. And waste social resources, increased the cost of construction. If the waste residue is used as subgrade filler after crushing, the material can be obtained locally, and the strength and stability of roadbed can also be improved. It is very important to test whether the compaction degree meets the requirement when the slag is used as the subgrade filler. In this paper, the engineering characteristics of tunnel slag are analyzed at first, secondly, the fragmentation of tunnel slag and its influencing factors are analyzed, and the factors that influence the compaction degree of tunnel slag are expounded. Some shortcomings of traditional compaction measurement methods are analyzed. Based on the domestic and foreign research results on the compaction degree of waste slag filler, the model of "vibration moving-subgrade packing" is established and a continuous compaction measurement system is put forward. This method is beneficial to the real-time control of compaction quality. In this paper, the theoretical analysis and field test of the continuous compaction measurement system are carried out, and the reliability and accuracy of the method are proved. The main conclusions are as follows: (1) in the highway construction of our country, the compaction degree detection method in the code is only applicable to the subgrade filled with earth, but there are great defects in the detection of the subgrade filled with stone. In this paper, a new testing method is studied and tried. That is compactness continuous testing technology. This method can be used to quickly detect the compaction quality of roadbed and has strong practicability. (2) the acceleration sensor and data acquisition instrument are proposed. The continuous compactness testing technology of the compactness continuous testing system composed of computer and data analysis system. By collecting the vibration signal of acceleration and analyzing it, the result can reflect the compaction degree of subgrade as a whole. The method is also proved to be accurate and feasible in this paper. (3) by analyzing the acceleration excitation signal of road roller, it is proved that the compaction degree of roadbed is positively correlated with the stiffness of subgrade filler and negatively correlated with its damping. The vertical vibration acceleration of the vibratory roller is also positively correlated with the stiffness of the subgrade filler and negatively correlated with its damping. Based on the results of theoretical analysis in this paper, a model of "vibratory road roller subgrade" is established. The results show that the compaction degree of subgrade filler is positively related to the vertical vibration acceleration of the vibratory roller. (4) because the waste material of the tunnel belongs to the bulk material and has the property of breaking, we use the first gradation to compare the three compaction processes. It is suggested that the effective value of vibration acceleration of vibratory roller can be used to express the compaction degree of compacted filler. In this paper, the regression formula and correlation coefficient between the compaction degree and the effective value of vibration wheel acceleration are obtained under the conditions of different gradation and different optimum moisture content.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U416.1
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