本文選題：水泥混凝土加鋪層 + 水泥混凝土板幅劃分��； 參考：《南華大學(xué)》2014年碩士論文

【摘要】：因交通量激增、車輛超載以及公路臨近使用年限，舊水泥混凝土路面開(kāi)始出現(xiàn)各種結(jié)構(gòu)性病害，原有路面的功能難以滿足日益增長(zhǎng)的交通的需要，同時(shí)也會(huì)造成行車安全等問(wèn)題。為恢復(fù)路面的功能，通常在舊水泥混凝土路面上加鋪瀝青面層或水泥混凝土面層，在舊水泥混凝土路面上加鋪瀝青面層的研究及建設(shè)較多，而加鋪水泥混凝土面層的研究相對(duì)較少。因此在舊水泥混凝土路面上加鋪水泥混凝土面層的設(shè)計(jì)及施工略有不足，從而造成加鋪層過(guò)早出現(xiàn)病害，影響公路運(yùn)營(yíng)時(shí)的正常使用。 湖南G322公路（衡南三塘-祁東白地市段）路面改建時(shí)，便是在舊水泥混凝土路面上鋪筑水泥混凝土加鋪層。加鋪層寬度11m，采用兩幅板塊（5.5m+5.5m）及三幅板塊（4m+3m+4m）進(jìn)行施工。在運(yùn)營(yíng)過(guò)程中，兩幅板塊的水泥混凝土加鋪層距離路面邊緣2.0-2.5m產(chǎn)生縱向裂縫，而三幅板塊的加鋪層中，常規(guī)長(zhǎng)度為5m的混凝土板產(chǎn)生的病害卻很少，僅局部10m過(guò)長(zhǎng)的板塊出現(xiàn)橫向裂縫。通過(guò)ABAQUS建模分析表明，兩幅板的加鋪層溫度應(yīng)力較大以及對(duì)路基不均勻變形的適應(yīng)性較差，可能是造成縱向裂縫的主要原因；三幅板局部10m長(zhǎng)度的混凝土板出現(xiàn)橫向裂縫，主要是板塊長(zhǎng)度過(guò)長(zhǎng)，在溫度和車輛荷載綜合作用下導(dǎo)致。因此，采用長(zhǎng)度為5m的三幅板加鋪形式是可行的。 文中針對(duì)三幅板加鋪形式，，分別設(shè)定方鋪方案B（4m+3m+4m）、加鋪方案C（3.5m+4m+3.5m）、加鋪方案D（3m+5m+3m）。通過(guò)有限元分析表明，縱縫不宜設(shè)置在車輛行駛輪跡附近；水泥混凝土板寬度應(yīng)為4m左右，較寬的水泥混凝土板宜布置在路面中間，較窄的水泥混凝土板布置到路面外側(cè)，可以減少溫度與車輛荷載疊加的綜合應(yīng)力，從而提高水泥混凝土加鋪層的疲勞壽命。加鋪方案C各項(xiàng)性能指標(biāo)較好，為推薦加鋪方案。通過(guò)對(duì)其板厚進(jìn)行分析，若將路肩處的基層及路基進(jìn)行補(bǔ)強(qiáng)，在標(biāo)準(zhǔn)軸載下加鋪層厚度宜為25cm，考慮到車輛超載，可將加鋪層厚度設(shè)置為28cm。
[Abstract]:Due to the rapid increase in traffic volume, overloading of vehicles and the approaching service life of the highway, the old cement concrete pavement began to appear various structural diseases, and the function of the original pavement could not meet the increasing traffic needs. At the same time, it will also cause traffic safety and other problems. In order to restore the function of the pavement, the asphalt or cement concrete pavement is usually added to the old cement concrete pavement, and the research and construction of the asphalt surface on the old cement concrete pavement is more than that on the old cement concrete pavement. However, the study of cement concrete surface layer is relatively less. Therefore, the design and construction of overlay cement concrete surface on the old cement concrete pavement is slightly insufficient, which causes premature disease of the overlay and affects the normal use of highway operation. When the road surface of Hunan G322 highway (Hengnan Santang-Qidong Baidi city section) is rebuilt, the cement concrete overlay is laid on the old cement concrete pavement. The width of the overlay is 11m, which is constructed with two plates (5.5m 5.5m) and three plates (4m 3m 4m). In the course of operation, the cement concrete overlay of two plates produces longitudinal cracks from the edge of the road surface 2.0-2.5 m, but among the three plates, the concrete slab with normal length of 5m produces few diseases. Only local plates with 10 m long have transverse cracks. The results of ABAQUS modeling and analysis show that the temperature stress of the overlay and the adaptability to the uneven deformation of the subgrade may be the main causes of the longitudinal cracks, and the transverse cracks appear in the concrete slabs with local length of 10 m in three slabs. The main reason is that the plate length is too long, which is caused by the combined action of temperature and vehicle load. Therefore, it is feasible to use three panels with length of 5m. In this paper, according to the three overlay forms, the plan of square paving is set up respectively, the plan of square paving is 4m 3m 4m / m, the scheme of overlay is 3.5m 4m 3.5m / m, and the scheme of overlay is 3m m ~ 3 m / m, respectively. The finite element analysis shows that the longitudinal joint should not be set near the wheel track of vehicle, the width of cement concrete slab should be about 4m, the wider cement concrete slab should be arranged in the middle of the pavement, and the narrower cement concrete slab should be arranged outside the pavement. The fatigue life of cement concrete overlay can be improved by reducing the combined stress of temperature and vehicle load. The overlay scheme C has better performance index, and it is recommended as the overlay scheme. Through the analysis of the plate thickness, if the base and roadbed at the road shoulder are strengthened, the overlay thickness under the standard axle load should be 25 cm, considering the overload of the vehicle, the overlay thickness can be set to 28 cm.
【學(xué)位授予單位】：南華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U418

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