【摘要】：目前國(guó)內(nèi)各規(guī)范對(duì)施工期荷載沒有嚴(yán)格的規(guī)定,也沒有考慮施工車輛荷載對(duì)路面結(jié)構(gòu)設(shè)計(jì)的影響;此外,在半剛性基層瀝青路面施工過程中,由于受季節(jié)及工期限制,趕工期的現(xiàn)象比較常見,一般鋪筑7d后或在較短的齡期下(未達(dá)到90d或180d)即進(jìn)行上層結(jié)構(gòu)的鋪筑,養(yǎng)生車輛、運(yùn)料車輛、攤鋪機(jī)和碾壓機(jī)等施工設(shè)備必然會(huì)對(duì)還未形成強(qiáng)度、剛度的下承層產(chǎn)生破壞,在施工期即產(chǎn)生了路面結(jié)構(gòu)的內(nèi)部損傷,使水泥穩(wěn)定碎石基層結(jié)構(gòu)產(chǎn)生微裂縫,為早期的損壞埋下隱患。雖然在通車初期基層微裂縫對(duì)路用性能沒有影響,但是在交通荷載的反復(fù)作用下基層結(jié)構(gòu)的強(qiáng)度急劇下降,裂縫擴(kuò)展,嚴(yán)重影響道路的路用性能和使用壽命。從舊路改造的施工中,我們可以看到施工車輛荷載對(duì)路面損傷的嚴(yán)重性,所以新建道路施工期荷載與非荷載因素(養(yǎng)生齡期、溫度)對(duì)道路可能產(chǎn)生先天損傷,使道路在運(yùn)營(yíng)后不久便產(chǎn)生各種不同程度的破壞。本研究通過對(duì)施工車輛荷載統(tǒng)計(jì)研究,采用理論分析與試驗(yàn)的方法對(duì)水泥穩(wěn)定碎石結(jié)構(gòu)層進(jìn)行損傷分析。首先,為了模擬施工過程可能遇到的天氣狀況,采用了不同的養(yǎng)生溫度,對(duì)水泥穩(wěn)定碎石材料進(jìn)行不同齡期的養(yǎng)生,然后進(jìn)行無側(cè)限抗壓強(qiáng)度、劈裂強(qiáng)度、抗壓回彈模量試驗(yàn)。結(jié)果表明:低溫對(duì)水泥穩(wěn)定材料的強(qiáng)度、模量有很大影響,低溫下材料的強(qiáng)度、模量都處于較低水平,尤其是低溫低齡期下,材料的各項(xiàng)指標(biāo)都很低。其次,基于施工期的車輛荷載作用,采用ABAQUS有限元軟件,并結(jié)合試驗(yàn)數(shù)據(jù),計(jì)算了水泥穩(wěn)定碎石底基層的層底拉應(yīng)力,提出了施工期底基層不發(fā)生極限破壞時(shí)所需要的養(yǎng)生時(shí)間和允許的荷載范圍。最后,進(jìn)行了不同養(yǎng)生溫度和齡期下的彎拉強(qiáng)度試驗(yàn),在此基礎(chǔ)上,進(jìn)行了低齡期不同溫度下的彎拉疲勞試驗(yàn),建立了室內(nèi)低齡期的疲勞預(yù)估模型。然后采用Miner線性損傷理論,對(duì)施工期不同工況下底基層的損傷進(jìn)行分析。結(jié)果表明:底基層在荷載直接作用下?lián)p傷最大,即在施工下基層時(shí)對(duì)底基層的損傷最為嚴(yán)重。通過分析,得出可以通過增加底基層材料強(qiáng)度、厚度、增長(zhǎng)養(yǎng)生齡期來減小施工荷載對(duì)底基層的損傷。
[Abstract]:At present, there are no strict regulations on the load during the construction period and no consideration of the influence of the load of the construction vehicle on the design of the pavement structure. In addition, in the construction process of the semi-rigid base asphalt pavement, due to the limitation of the season and the duration of the construction period, The phenomenon of time delay is quite common. Generally speaking, after 7 days of paving or under a shorter age (less than 90 days or 180 days), the construction equipment of the upper structure, health vehicles, transport vehicles, pavers and compactors will inevitably have not formed the intensity of the construction equipment. During the construction period, the internal damage of the pavement structure is produced, which makes the cement stabilized crushed stone base structure produce micro-cracks, which is the hidden danger for the early damage. Although there is no effect of micro-cracks on the road performance in the initial stage of traffic, the strength of the base structure decreases sharply under the repeated action of traffic load, and the crack expands, which seriously affects the road performance and service life of the road. From the construction of the old road reconstruction, we can see the severity of the road damage caused by the load of the construction vehicle, so the load and non-load factors (health age, temperature) may cause congenital damage to the road during the construction period of the new road. Causes the road soon after the operation produces each kind of degree of destruction. In this study, the damage analysis of cement stabilized crushed stone structure layer is carried out by means of theoretical analysis and test method through the statistical research on the load of construction vehicles. Firstly, in order to simulate the weather conditions that may be encountered in the construction process, different curing temperatures are used to carry out the tests of unconfined compressive strength, splitting strength and compressive resilience modulus of cement-stabilized macadam materials at different ages. The results show that the strength and modulus of the cement stabilized material are greatly affected by low temperature. The strength and modulus of the material are all in low level at low temperature, especially in the low temperature and low age period, all the indexes of the material are very low. Secondly, based on the vehicle load during construction, the tensile stress of cement stabilized gravel base is calculated by using ABAQUS finite element software and test data. At the end of the construction period, the required health time and the allowable load range for the base course without ultimate failure are put forward. Finally, the flexural tensile strength tests at different health temperatures and ages were carried out. On the basis of these tests, bending tension fatigue tests at different temperatures in the lower age period were carried out, and a fatigue prediction model for the lower age period was established. Then the Miner linear damage theory is used to analyze the damage of the base under different working conditions. The results show that the damage of the base is the most serious under the direct action of the load, that is, the damage to the base is the most serious when the base is under construction. Through analysis, it is concluded that the damage caused by construction load on the base can be reduced by increasing the strength, thickness and health age of the base material.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U416.214

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本文編號(hào)：2218717