排水沥青路面空隙堵塞及其对侧向排水能力的影响
- Title:
- Porosity Clogging of Drainage Asphalt Pavement and Its Effect on Lateral Drainage Capacity
- Keywords:
- font-size: 10pt; ">drainage asphalt pavement; lateral drainage capacity; anti font-size: 10pt; ">clogging ability; porosity content; seepage coefficient
- 摘要:
-
对于表层排水沥青路面，其排水能力主要通过内部侧向排水实现，但使用过程中的孔隙堵塞会对该类路面的排水能力产生影响，为此通过堵塞试验进行了研究。堵塞试验中分级添加单一级配或混合级配的颗粒物，依次测定堵塞后的渗水系数，以残余渗水系数反映孔隙堵塞对排水能力的影响。结果表明，堵塞试验开始阶段排水沥青混合料的渗水系数衰减速度最快，随着堵塞试验次数的增加，渗水系数衰减速度逐渐变缓。各试件渗水系数的变化规律与堵塞颗粒物的粒径有关，空隙率较小的PAC13-Ⅰ试件容易受到较大粒径（0.3～2.36 mm）颗粒物的堵塞，而空隙率较大的PAC13-Ⅱ试件容易被粒径为0～0.6 mm的小颗粒物堵塞。由最终的残余渗水系数可知，PAC13-Ⅱ试件的抗堵塞能力显著优于PAC13-Ⅰ试件。
- Abstract:
-
For surface drainage asphalt pavement, its drainage capacity is mainly achieved through internal lateral drainage.However, porosity clogging has an adverse impact on the drainage capacity of this pavement. For this reason, the effect of porosity clogging on the lateral drainage capacity of drainage surface was explored through clogging test. In the clogging test, single or mixed particles were added in different grades, the seepage coefficient after clogging was measured successively, and the residual seepage coefficient was used to reflect the effect of porosity clogging on the drainage capacity. The seepage coefficient of drainage asphalt mixture had the fastest attenuation velocity at the beginning of the clogging test, and the attenuation velocity of seepage coefficient gradually slowed down with the increase of the clogging test times. The variation of seepage coefficient of each specimen was related to the particle size of the blockage. PAC13- Ⅰspecimen with low porosity content was easily blocked by large particles with particle size of 0.3-2.36 mm, while PAC13-Ⅱspecimen with high porosity content was easily blocked by small particles with particle size of 0-0.6 mm. According to the final residual seepage coefficient, the anti-clogging ability of the PAC13-Ⅱ specimen was significantly superior to that of the PAC13-Ⅰspecimen.
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