發(fā)布時(shí)間：2018-08-19 18:18

【摘要】：隨著國(guó)家政策的不斷務(wù)實(shí)、路網(wǎng)的逐步完善,以及交通運(yùn)輸一體化和服務(wù)質(zhì)量需求的不斷提升,公路交通管理將轉(zhuǎn)變?yōu)榻B(yǎng)并重、管養(yǎng)結(jié)合的模式。而路面承載力評(píng)價(jià)是進(jìn)行路面養(yǎng)護(hù)決策的重要依據(jù),現(xiàn)有的利用貝克曼梁測(cè)得彎沉值的方法,不能反映路面結(jié)構(gòu)在行車(chē)動(dòng)載荷下的力學(xué)響應(yīng),測(cè)定結(jié)果又受到環(huán)境條件與材料的影響,難以成為路面結(jié)構(gòu)設(shè)計(jì)符合性檢驗(yàn)的有效手段。因此,瀝青路面結(jié)構(gòu)承載力評(píng)價(jià)研究十分關(guān)鍵。論文基于路面結(jié)構(gòu)層材料的動(dòng)態(tài)模量試驗(yàn)結(jié)果,結(jié)合大新科研試驗(yàn)路資料分析了路面結(jié)構(gòu)應(yīng)力狀態(tài),并對(duì)晉濟(jì)高速進(jìn)行了結(jié)構(gòu)承載力評(píng)價(jià),得出以下結(jié)論:采用直接根據(jù)野外路面結(jié)構(gòu)反算模量判定路面結(jié)構(gòu)承載力的評(píng)價(jià)體系;將路面結(jié)構(gòu)各層材料按野外現(xiàn)場(chǎng)FWD測(cè)試環(huán)境和力學(xué)特性劃分類(lèi)型以確定標(biāo)準(zhǔn)狀態(tài)下動(dòng)態(tài)模量規(guī)定值,改變了以往因路用材料動(dòng)態(tài)模量變化劇烈無(wú)法得到準(zhǔn)確判定值的局面;采用基于實(shí)測(cè)溫度梯度和FWD荷載作用頻率建立動(dòng)態(tài)模量評(píng)價(jià)標(biāo)準(zhǔn),從瀝青混合料粘彈本質(zhì)上和野外現(xiàn)場(chǎng)荷載作用基礎(chǔ)上消除了系統(tǒng)誤差和目標(biāo)值多次預(yù)測(cè)誤差;按“動(dòng)態(tài)彎沉等效”原則建立復(fù)合模量判定方法,提出基于復(fù)合模量判定和疲勞荷載作用下彎曲模量衰減閾值的瀝青路面結(jié)構(gòu)承載力評(píng)價(jià)體系,克服了現(xiàn)有結(jié)構(gòu)層模量反算準(zhǔn)確度差的問(wèn)題和瀝青路面結(jié)構(gòu)承載力評(píng)價(jià)體系實(shí)用性缺失的問(wèn)題。研究成果已在山西省高速公路路面維修工程的設(shè)計(jì)、施工中得到推廣應(yīng)用,可為現(xiàn)有新建道路結(jié)構(gòu)承載力符合性檢驗(yàn)和舊瀝青路面結(jié)構(gòu)承載力評(píng)價(jià)、養(yǎng)護(hù)決策、合理設(shè)計(jì)處治方案提供科學(xué)依據(jù)。
[Abstract]:With the continuous pragmatism of national policy, the gradual improvement of road network, and the continuous improvement of transportation integration and service quality demand, highway traffic management will be transformed into the mode of combining construction and maintenance with the combination of management and maintenance. The evaluation of pavement bearing capacity is an important basis for pavement maintenance decision. The existing methods of measuring deflection by Beckman beam can not reflect the mechanical response of pavement structure under driving dynamic load. The test results are affected by environmental conditions and materials, so it is difficult to be an effective means to test the conformance of pavement structure design. Therefore, it is very important to evaluate the bearing capacity of asphalt pavement structure. Based on the dynamic modulus test results of pavement layer material, the stress state of pavement structure is analyzed in combination with the data of Daxin scientific research test road, and the structural bearing capacity of Jinji Expressway is evaluated. The conclusions are as follows: the evaluation system is used to judge the bearing capacity of pavement structure directly according to the reverse calculation modulus of pavement structure in the field; According to the field FWD test environment and mechanical characteristics, the pavement structure materials are divided into different types to determine the dynamic modulus in the standard state, which changes the former situation that the dynamic modulus of road materials can not be accurately determined because of the drastic changes of the dynamic modulus of road materials. Based on the measured temperature gradient and FWD load frequency, the dynamic modulus evaluation standard is established. The systematic error and target multiple prediction error are eliminated from the essence of asphalt mixture viscoelasticity and field load. According to the principle of "dynamic deflection equivalence", the method of determining composite modulus is established, and the evaluation system of asphalt pavement structure bearing capacity based on composite modulus determination and bending modulus attenuation threshold under fatigue load is put forward. It overcomes the problems of poor accuracy of back calculation of structural layer modulus and lack of practicability of evaluation system of asphalt pavement structure bearing capacity. The research results have been popularized and applied in the design and construction of highway pavement maintenance engineering in Shanxi Province, which can be used to test the bearing capacity of existing newly built road structures, evaluate the bearing capacity of old asphalt pavement structures, and make maintenance decisions. Reasonable design of treatment plan provides scientific basis.
【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】：2015
【分類(lèi)號(hào)】：U416.217

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本文編號(hào)：2192446