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基于水泥稳定基层产生收缩裂缝难以避免,并容易扩展到沥青面层而形成反射裂缝,故在水泥稳定基层材料摊铺后养护的1～3 d内,采用振动压路机进行碾压,使其产生网状细裂缝,避免产生宽或长的裂缝,形成了理想的裂缝分布模式。采用内聚力模型对裂缝分布模式进行模拟,并对预裂缝技术的机理进行了理论分析。结果表明:与间距大、数量少而宽的裂缝相比,间距小、数量多的细裂缝引起反射裂缝的可能性要小很多,预裂缝技术释放了早期水泥稳定基层内部由于干缩和温缩蓄积的部分能量。根据能量最小原理,系统的能量越小,系统越稳定。基于能量法的内聚力模型能较好的模拟裂缝,解释了预裂缝技术的本质机理,为预裂缝技术的应用提供了良好的理论基础。
Based on the stable base of cement produced shrinkage cracks are difficult to avoid, and easily spread to the asphalt surface to form reflective cracks, so the cement stabilized base material paving after curing 1 ~ 3 d, the use of vibratory roller compaction to produce net Fine cracks, to avoid the generation of wide or long cracks, forming the ideal pattern of fracture distribution. The cohesion model is used to simulate the fracture distribution mode and the theoretical analysis of the mechanism of pre-fracture technology is carried out. The results show that the fine cracks with small spacing and large number are much less likely to cause reflection cracks than those with large and small gaps. The pre-cracking technology releases the early shrinkage and shrinkage Part of the accumulated energy. According to the principle of minimum energy, the smaller the energy of the system, the more stable the system. The cohesion model based on the energy method can better simulate the fracture, explain the essential mechanism of the pre-fracture technique and provide a good theoretical basis for the application of the pre-fracture technique.