考虑土的塑性损失特性的劈裂灌浆压力研究

劈裂灌浆技术是堤坝加固领域的一个非常有效的方法。基于柱形孔扩张大应变理论,将劈裂灌浆的初始阶段视为无限土体中柱形孔扩张的平面应变问题。土体在初始灌浆压力作用下为理想弹性体;但随着灌浆压力的增大,假定土体发生塑性损伤大应变破坏,并服从广义SMP准则。通过相关的变参数计算,探讨了内摩擦角和粘聚力对灌浆压力的影响,为实际工程提供了理论依据。

Study on Splitting Grouting Pressure of Soil Considered Plastic Damage

The splitting grouting technology is an effective reinforcement method in the field of dam reinforcement. Based on the cylindrical cavity expansion and large strain theory, the early phase of splitting grouting was regarded as the plane strain question of cylindrical expansion in the infinite soil. Under the initial grouting pressure, the soil was supposed as the ideal elastic mass, then, there was the plastic damage in the soil with the increase of grouting pressure, which was submitted to the extended spatial mobilization plane criterion. Through parameter computing, the influence both of the internal friction angle and the cohesion was discussed on the grouting pressure, which was provided the theory for the actual project.