考虑季节温度的半刚性基层施工方法研究
发布时间：2018-08-02 17:08
【摘要】：半刚性基层在我国公路建设中应用广泛,其结构的安全性直接影响公路使用寿命。在半刚性基层施工期间,由于季节不同导致养护温度过高或过低很容易造成基层材料强度不足,基层层底产生较大拉应力而发生弯拉破坏,进而造成面层结构的开裂。本文通过对系统试验的总结分析与力学响应分析,深入研究了分层摊铺施工方法和连续摊铺施工方法在路面结构整体强度形成期内,不同养生温度下,车辆荷载对路面结构受力特性的影响作用,为不同养生温度下基层施工方法的选择提供依据。(1)对河北省部分地区的气候特点、半刚性基层路面结构形式施工和施工车辆荷载系统调查,确定了河北省半刚性基层沥青路面典型结构形式、材料配比及荷载分布规律。根据实际调查,确定计算用养护温度。(2)室内试验研究了不同配合比的石灰土、水泥稳定碎石、二灰稳定碎石等半刚性基层材料在不同养生温度(10℃、20℃、30℃)条件下的无侧限抗压强度、劈裂强度、抗压回弹模量等路用性能随龄期的变化规律。(3)选取两种典型半刚性基层路面结构,运用力学分析软件kenpave定量分析了基层施工过程中轴载为180KN时,采用分期、分层施工及连续摊铺法施工基层的受力变形。分析结果表明:采用分层摊铺施工方法,不满足力学要求;而采用连续摊铺法施工时,路面结构在养护温度为10℃时养生14d并控制车辆荷载的条件下满足强度要求;在养护温度为20℃时适当控制车辆荷载可满足强度要求;在养护温度为30℃时,养生7d可适当控制车辆荷载,养生14d满足强度要求。(4)建立了施工期间路面结构层底最大拉应力与龄期和轴载的回归方程,为养生龄期和施工车辆轴载的控制提供依据。
[Abstract]:Semi-rigid base is widely used in highway construction in China, and the safety of its structure directly affects the service life of highway. During the construction of semi-rigid base, it is easy to cause the understrength of the base material due to the high or too low curing temperature caused by the different seasons, and the large tensile stress at the bottom of the base layer leads to the bending and tensile failure, which leads to the cracking of the surface structure. Through summing up and analyzing the system test and mechanical response analysis, this paper deeply studies the layered paving construction method and the continuous paving construction method under the different curing temperature during the whole strength forming period of the pavement structure. The effect of vehicle load on the mechanical characteristics of pavement structure provides a basis for the selection of construction methods for the base course at different temperatures. (1) the climatic characteristics in some parts of Hebei Province. Based on the construction of semi-rigid base pavement and the investigation of vehicle load system, the typical structure form, material ratio and load distribution of semi-rigid base asphalt pavement in Hebei Province are determined. According to the actual investigation, the curing temperature for calculation was determined. (2) the lime soil and cement stabilized macadam with different mix ratio were studied in laboratory. The unconfined compressive strength and splitting strength of semi-rigid base materials such as lime-fly ash stabilized macadam at different health temperatures (10 鈩，
本文编号：2160109
[Abstract]:Semi-rigid base is widely used in highway construction in China, and the safety of its structure directly affects the service life of highway. During the construction of semi-rigid base, it is easy to cause the understrength of the base material due to the high or too low curing temperature caused by the different seasons, and the large tensile stress at the bottom of the base layer leads to the bending and tensile failure, which leads to the cracking of the surface structure. Through summing up and analyzing the system test and mechanical response analysis, this paper deeply studies the layered paving construction method and the continuous paving construction method under the different curing temperature during the whole strength forming period of the pavement structure. The effect of vehicle load on the mechanical characteristics of pavement structure provides a basis for the selection of construction methods for the base course at different temperatures. (1) the climatic characteristics in some parts of Hebei Province. Based on the construction of semi-rigid base pavement and the investigation of vehicle load system, the typical structure form, material ratio and load distribution of semi-rigid base asphalt pavement in Hebei Province are determined. According to the actual investigation, the curing temperature for calculation was determined. (2) the lime soil and cement stabilized macadam with different mix ratio were studied in laboratory. The unconfined compressive strength and splitting strength of semi-rigid base materials such as lime-fly ash stabilized macadam at different health temperatures (10 鈩，
本文编号：2160109
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