發(fā)布時間：2019-05-23 19:45

【摘要】：為了研究沙漠區(qū)半剛性基層瀝青混凝土路面受賦存氣候環(huán)境影響,由溫度應(yīng)力作用引起路面橫向隆起的半剛性基層力學(xué)響應(yīng),采用彈性薄板理論與復(fù)合材料力學(xué)理論,依據(jù)病害成因?qū)⒙访鏅M向隆起病害實(shí)體抽象簡化為由材料性能、厚度不同的兩塊各向同性單層板所構(gòu)成的四邊簡支、承受路面結(jié)構(gòu)層自重的整體式雙層板結(jié)構(gòu),建立半剛性基層發(fā)生橫向隆起病害的拱脹力學(xué)模型。分析了基層結(jié)構(gòu)在路面結(jié)構(gòu)層自重和縱向均布壓力作用下的撓度微分方程,并推演了其失穩(wěn)的臨界荷載表達(dá)式。結(jié)合路面的實(shí)際情況,認(rèn)為路面結(jié)構(gòu)的臨界荷載取為(N_x)_(cr)=4π~2D/b~2較為合理;之后利用復(fù)合材料力學(xué)理論和彈性薄板理論分析并推導(dǎo)了整體式雙層板的抗彎剛度表達(dá)式及中性軸位置的確定方法。結(jié)果表明:在縱向均布壓力N_x≥(N_x)_(cr),基層結(jié)構(gòu)將發(fā)生失穩(wěn)破壞。
[Abstract]:In order to study the mechanical response of semi-rigid base asphalt concrete pavement affected by climate environment and lateral uplift caused by temperature stress, elastic thin plate theory and composite mechanics theory are adopted. According to the cause of the disease, the disease entity of pavement transverse uplift is abstracted as a four-sided simple support composed of two isotropic single-story plates with different thickness, which bears the weight of the pavement structure layer, and the integral double-layer plate structure, which is composed of two isotropic monolayers with different thickness, is simply supported on four sides and bears the weight of the pavement structure layer. The arch expansion mechanical model of transverse uplift disease of semi-rigid base is established. The deflection differential equation of base structure under the action of self-weight and longitudinal uniform pressure of pavement structure is analyzed, and the critical load expression of instability is deduced. According to the actual situation of pavement, it is considered that the critical load of pavement structure is (N 鈮，

本文編號：2484175