本文關(guān)鍵詞：混凝土預(yù)制塊路面力學(xué)行為及結(jié)構(gòu)設(shè)計(jì)方法研究　出處：《重慶交通大學(xué)》2014年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 預(yù)制塊路面 力學(xué)行為 環(huán)道試驗(yàn) 臨界彎沉 永久變形預(yù)估模型

【摘要】：混凝土預(yù)制塊路面是由單個(gè)小尺寸（平面尺寸通常在30×30cm以下）預(yù)制塊體鋪筑在砂墊層上形成的一種特殊路面結(jié)構(gòu)，可采用人工或小型機(jī)械輔助施工，其施工靈活且受天氣影響小，對(duì)環(huán)境污染少。預(yù)制塊路面是一種可以拆卸的“活路面”，塊體可以重復(fù)利用，且便于就地取材，工程成本及環(huán)境壓力小。因此，預(yù)制塊路面是一種既經(jīng)濟(jì)又環(huán)保的路面結(jié)構(gòu)型式。目前在國(guó)外高等級(jí)公路中已有應(yīng)用，但在國(guó)內(nèi)高等級(jí)公路中的應(yīng)用還是空白。 預(yù)制塊路面力學(xué)行為及破壞模式與水泥路面和瀝青路面有著本質(zhì)不同，以致在路面結(jié)構(gòu)設(shè)計(jì)、施工工藝以及養(yǎng)護(hù)維修等方面存在較大差異，受適用場(chǎng)合及使用規(guī)模的限制，國(guó)內(nèi)缺乏對(duì)這種路面結(jié)構(gòu)較為系統(tǒng)深入地研究，目前尚無(wú)系統(tǒng)完善的混凝土預(yù)制塊路面力學(xué)行為理論和結(jié)構(gòu)設(shè)計(jì)方法，對(duì)其施工工藝、排水措施、施工質(zhì)量保證措施、驗(yàn)收標(biāo)準(zhǔn)等也幾乎處于空白，因而嚴(yán)重制約了混凝土預(yù)制塊路面在國(guó)內(nèi)的推廣和應(yīng)用。 論文依托云南磨（黑）至思（茅）高速公路建設(shè)，針對(duì)混凝土預(yù)制塊路面力學(xué)行為、結(jié)構(gòu)設(shè)計(jì)方法、路面滲水特性及結(jié)構(gòu)防排水設(shè)計(jì)、路用性能評(píng)價(jià)、路面施工工藝及質(zhì)量保證措施等展開系統(tǒng)深入研究。借助室內(nèi)大型足尺環(huán)道試驗(yàn)場(chǎng)，按1:1比例鋪筑不同結(jié)構(gòu)組合的預(yù)制塊路面，試驗(yàn)段考慮了水泥穩(wěn)定碎石和級(jí)配碎石兩種基層型式、考慮了細(xì)砂、水泥+細(xì)砂、乳化瀝青砂漿三種接縫材料和2mm、5mm、8mm、10mm四種接縫寬度、考慮了2cm、4cm、6cm三種砂墊層厚度、塊體尺寸為29cm×19cm×16cm（長(zhǎng)×寬×高），通過(guò)調(diào)整鋪砌方式考慮了16cm、19cm、29cm三種塊體結(jié)構(gòu)層厚度。 論文取得的主要成果如下： 1、通過(guò)承載板試驗(yàn)實(shí)測(cè)不同結(jié)構(gòu)組合下的預(yù)制塊路面荷載-彎沉曲線，研究了塊體平面尺寸、接縫材料類型、接縫寬度、砂墊層厚度、基層類型等對(duì)預(yù)制塊路面承載力的影響，試驗(yàn)證實(shí)了塊體層“拱效應(yīng)”的存在；在荷載作用下塊體層表現(xiàn)出“變剛度”的承載力特性，最終揭示了預(yù)制塊路面承載力機(jī)理； 2、提出了臨界彎沉、荷載擴(kuò)散系數(shù)、永久變形影響系數(shù)等預(yù)制塊路面結(jié)構(gòu)設(shè)計(jì)關(guān)鍵參數(shù)，通過(guò)承載力試驗(yàn)確定了水泥穩(wěn)定碎石和級(jí)配碎石兩種基層條件下，不同塊體尺寸、砂墊層厚度和不同接縫寬度下的預(yù)制塊路面臨界彎沉值、荷載擴(kuò)散系數(shù)取值范圍、永久變形影響系數(shù)取值范圍； 3、通過(guò)室內(nèi)足尺環(huán)道試驗(yàn)測(cè)試了在不同標(biāo)準(zhǔn)軸載作用次數(shù)下預(yù)制塊路面平整度和接縫寬度的變化，研究了接縫寬度、砂墊層厚度、塊體厚度以及荷載作用次數(shù)對(duì)預(yù)制塊路面永久變形的影響規(guī)律，建立了混凝土預(yù)制塊路面永久變形預(yù)估模型； 4、通過(guò)接縫滲水試驗(yàn)和室內(nèi)模擬降雨試驗(yàn)研究混凝土預(yù)制塊路面接縫的滲水特性，研究了接縫材料、接縫寬度對(duì)滲水系數(shù)的影響，確定了混凝土預(yù)制塊路面接縫的滲水系數(shù)取值范圍，建立了預(yù)制塊路面單位面積（1m2）的滲水量計(jì)算方法； 5、運(yùn)用ANSYS軟件建立預(yù)制塊路面結(jié)構(gòu)的三維有限元模型，針對(duì)級(jí)配碎石柔性基層和水泥穩(wěn)定碎石半剛性基層，分析計(jì)算了塊體厚度、基層厚度、路基模量等對(duì)于路表彎沉、基層頂面壓應(yīng)力和基層底面拉應(yīng)力的影響。計(jì)算結(jié)果表明路基模量是影響預(yù)制塊鋪面路表彎沉值的最主要因素，塊體厚度和基層厚度對(duì)于基層底面拉應(yīng)力有一定影響； 6、建立了以路表車轍深度和基層底面拉應(yīng)力為控制指標(biāo)的基于力學(xué)的混凝土預(yù)制塊路面結(jié)構(gòu)設(shè)計(jì)方法，提出適用于柔性基層的預(yù)制塊路面車轍深度計(jì)算方法和適用于半剛性基層的預(yù)制塊路面基層底面拉應(yīng)力計(jì)算方法，并給出了相應(yīng)的軸載換算方法和設(shè)計(jì)指標(biāo)容許值范圍； 7、提出了適合于高速公路應(yīng)急車道、服務(wù)區(qū)的預(yù)制塊路面典型結(jié)構(gòu)型式，制定了預(yù)制塊路面施工工藝及質(zhì)量保證措施，基于論文研究成果指導(dǎo)鋪筑了600m混凝土預(yù)制塊路面試驗(yàn)段，，獲得了成功。 論文研究成果涉及了預(yù)制塊路面結(jié)構(gòu)力學(xué)行為及結(jié)構(gòu)設(shè)計(jì)方法、預(yù)制塊路面結(jié)構(gòu)組合及路用性能評(píng)價(jià)、預(yù)制塊路面排水特性及排水結(jié)構(gòu)層設(shè)計(jì)、預(yù)制塊路面施工工藝、質(zhì)量保證措施、質(zhì)量驗(yàn)收方法以及經(jīng)濟(jì)性評(píng)價(jià)，為推動(dòng)混凝土預(yù)制塊路面的應(yīng)用與發(fā)展提供了技術(shù)儲(chǔ)備。
[Abstract]:Precast concrete block pavement is a single small size (usually in the plane size of 30 * 30cm) is a kind of special precast block paving pavement structure in the sand cushion formation, can use manual or small machinery auxiliary construction, its construction is flexible and little affected by the weather, less pollution to the environment is a precast block pavement. A removable "pavement" blocks can be reused, and easy to use local materials, engineering cost and environmental pressure is small. Therefore, the precast block pavement is a kind of economical and environment-friendly pavement structures. Has been applied abroad in high grade highway in China at present, but in the high grade highway is still blank.
Precast block pavement mechanics behavior and failure mode of cement pavement and asphalt pavement is essentially different, resulting in the pavement structure design, there is a big difference between the construction process and maintenance etc., by the application and use of restrictions on the scale of the domestic lack of the pavement structure in-depth study of systematic structure, there is no perfect system of concrete precast block pavement mechanics behavior theory and method of structure design, drainage measures, the construction technology, construction quality assurance measures, acceptance standards are almost blank, thus seriously restricted the concrete pavement concrete precast block in the domestic popularization and application.
Based on the Yunnan mill (black) to Si (MAO) highway construction, the mechanical behavior of precast concrete block pavement structure, design method, design of anti seepage drainage properties and pavement structure, pavement performance evaluation, pavement construction technology and quality assurance measures are systematically researched deeply. With the help of indoor large full-scale loop test field. According to the proportion of 1:1 precast block pavement paving combination of different structures, considering the test section of cement stabilized macadam and gravel two basic types, the fine sand, fine sand and cement emulsified asphalt mortar, three kinds of joint material and 2mm, 5mm, 8mm, 10mm four kinds of joint width, consider the 2cm, 4cm. 6cm three sand cushion thickness, the block size is 29cm * 19cm * 16cm (length * width * height), by adjusting the paving method considering the 16cm, 19cm, 29cm three kinds of block structure layer thickness.
The main achievements of this paper are as follows:
1, the precast block pavement load - bearing plate test under different structure combination of the deflection curve of block plane size, joint material type, joint width, thickness of sand cushion of base type bearing capacity of precast block pavement, test confirmed that the block layer "arch effect" exists; under the load of block layer shows "bearing capacity stiffness", finally reveals the bearing mechanism of precast block pavement;
2, the concept of critical load deflection, diffusion coefficient, permanent deformation coefficient of precast block pavement structure design of key parameters of cement stabilized macadam and gravel two basic conditions determined by bearing capacity tests under different block sizes, thickness of sand cushion and different seam width of precast block pavement bend under the sink load value, diffusion coefficient range, permanent deformation coefficient range;
3, change width of precast block pavement roughness and joint load at different times under the standard axle test through indoor full-scale loop test, study the joint width, thickness of sand cushion, influence of the number of block thickness and load of precast block pavement permanent deformation, established the pavement concrete precast block permanent deformation estimation model;
4, through the joint penetration test and indoor simulated rainfall experiments on seepage characteristics of precast concrete pavement joint, the joint research materials, effects of joint width on the permeability coefficient, permeability coefficient to determine the range of joint of precast concrete block pavement, a precast block pavement per unit area (1m2) method to calculate the seepage volume;
5, the establishment of a three-dimensional finite element model of precast block pavement structure by using ANSYS software for Graded Macadam flexible base and cement stabilized macadam semi-rigid base, analyzed the block thickness, base thickness and subgrade modulus of the road surface deflection, the surface effect of compressive stress and tensile stress at the bottom of the base. The calculation results show that the modulus of subgrade is the main influencing factor of precast block pavement surface deflections, block thickness and base thickness has a certain influence on the base bottom tensile stress;
6, to establish a road surface rut depth and the mechanics of the precast concrete block pavement structure design method based on base bottom tensile stress control index, precast block pavement base layer bottom tensile stress calculation method of rutting depth of precast block pavement is proposed for the flexible base calculation method and is suitable for semi rigid base, and gives the corresponding conversion method of axle load and design index of allowable value range;
7, a typical structure type for precast block pavement suitable for Expressway Emergency lane and service area has been put forward. The precast block pavement construction technology and quality assurance measures have been worked out. Based on the research results, the 600m concrete precast block pavement test section has been paved successfully.
The research results of this paper relates to precast block pavement structure mechanical behavior and design method of the structure evaluation of precast block pavement structure and pavement performance, the design of precast block pavement drainage and drainage characteristics of precast block pavement structure layer, construction technology, quality assurance measures, quality inspection and the method of economic evaluation, provides technical reserves for promoting the application of with the development of concrete block pavement.

【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.2

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