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本研究在分析了车辆驶经混凝土路面时传递到基础上的压力分布(基础承载值)包络图,并实验测定了荷载重复作用下各种基础的形变累积规律之后,结合车轮横向分布的频率,估算了设置不同基层后路面支承状态的改善程度,采用有限元法计算局部脱空状态下路面内荷载应力的变化规律;由此建立起不同使用年限条件下,基层、路面支承条件和荷载应力变化之间的关系,用以研究基层在水泥混凝土路面中的作用. 采用上述方法,分析了几种典型基层后得出: (1)设置基层之后,路面与基础之间的脱空状况有明显改善,由此能减少由于脱空而产生的附加应力,有效地延长了路面的使用寿命. (2)应当采用整体性好的材料修筑基层。就我国的情况来讲,建议采用石灰土或者工业废渣. (30理论计算证实,只要修筑一定厚度的稳定性好的基层,就能达到防止唧泥的目的.
In this paper, the envelope of pressure distribution (basic bearing value) which is transmitted to the foundation when the vehicle passes through the concrete pavement is analyzed and the deformation accumulation laws of various foundations under the action of repeated load are experimentally measured. Based on the frequency distribution of the transverse distribution of the wheel , The improvement degree of pavement support state after different grass-roots level was set was estimated, and the variation law of load stress in pavement under partial emptying state was calculated by finite element method. Under different service life conditions, the bearing conditions of foundation and pavement and load stress Changes in the relationship between the grassroots in order to study the role of concrete pavement. Using the above method, the analysis of several typical grass-roots obtained: (1) After the establishment of the grass-roots level, the pavement and the basis of the obvious empty state Improve, thereby reducing the additional stress due to void, effectively extending the service life of the road. (2) should be used to build a good overall quality of the grassroots. In the case of our country, it is advisable to use lime soil or industrial waste. (30 Theoretical calculations confirm that as long as a stable grass-roots with a certain thickness is built, the purpose of preventing pumice can be achieved.