挡土墙加固工程锚杆预应力损失与补偿

Prestress losing and Compensate Method in the Reinforcement Project of Retaining Wall

以104国道预应力锚杆加固加筋土挡土墙为例,通过数值模拟和实验的方法,讨论了二次补偿张拉解决此类问题的可行性.结果表明,一次张拉一段时间内进行二次补偿张拉,不仅能够有效消除相邻锚杆间的影响,而且还能抑制锚杆的预应力衰减.对于土体预应力锚固工程,其锚杆预应力设计和施工应充分考虑预应力损失,在实际施工中可以应用二次补偿张拉手段解决这一问题.

The feasibility of using the second compensate tension to solve the prestress-losing problem was analyzed with the methods of numerical analog calculation and experiment according to the reinforcement project of 104 National Road in Shandong Province. The result indicated that the reciprocity of the closer anchor and the prestress attenuation can be effectively eliminated using the second compensate tension. It is concluded that the problem of prestress-losing should be considered in the course of design and construction and be solved with the method of the second compensate tension in the soil reinforcement project of prestressed anchors.