Reinforced by Prestressed Anchor Cables and Double-Row Antisliding Piles
Reinforced by Prestressed Anchor Cables and Double-Row Antisliding Piles
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预应力锚索和双排抗滑桩加固
DOI：
10.1155/2021/9952380
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发表时间：
2021
影响因子：
1.6
通讯作者：
Yong Yao
中科院分区：
文献类型：
--
作者：
Zuo-ju Wu;Zhi-jia Wang;Jun-wei Bi;Xiao Fu;Yong Yao
联合支护结构由于其良好的加固效果，在边坡工程中逐渐受到重视。然而，大多数已发表的研究工作集中在地震反应的单一正式的支持结构。联合支护结构的动力响应研究较少，目前的抗震设计主要是根据经验进行的。在这项工作中，进行了一系列大型振动台试验，以研究联合支护结构（即，研究了地震作用下（预应力锚和双排抗滑桩）与加筋边坡的动力响应，包括加筋边坡内部加速度和表面加速度的放大效应、锚预应力的分布和变化、抗滑桩后土压力的动力响应以及加筋边坡表面的水平位移。试验结果表明，在复合支护体系加固的情况下，具有多层软弱滑动面的边坡可经受0.9g的强地震动。抗滑桩荷载已达到其承载力的80%，锚索荷载已达到其承载力的75.0%。当地震烈度达到0. 5 g时，坡面有明显的下倾趋势，这将使抗滑桩后相应的土压力突然增大。在潜在滑动区，锚索轴力在地震作用下会突然增大;地震后，锚索的初始预应力会损失，损失幅度为7.0%~ 23.0%。试验结果为进一步研究此类组合支护结构的抗震性能提供了重要参考。
The combined retaining structure has gradually received considerable attention in the slope engineering, due to its good re-inforcement effects. However, most of the published research studies were focused on the seismic responses of the single-formal supporting structure only. The investigations of dynamicresponses of the combined retaining structures are scarce, and the current seismic design is conducted mainly based on experiences. In this work, a series of large-scale shaking table tests were conducted to investigate the seismic responses of the combined retaining structures (i.e., prestressed anchor cables and double-row antisliding piles) and the reinforced slope under seismic excitations, including amplification effect of internal and surface acceleration of the reinforced slope, distribution and change of prestress of the anchor cable, dynamic response of soil pressure behind the antislide pile, and horizontal displacement of the reinforced slope surface. Test results show that, supported by the reinforcement of composite support system, the slope with the multilayer weak sliding surface can experience strong ground motion of 0.9 g. The load of the antisliding pile has reached 80% of its bearing capacity, and the load of the anchor cable has reached 75.0% of its bearing capacity. When the seismic intensity reaches 0.5 g, the slope surface has an obvious downward trend, which will make the corresponding soil pressure suddenly increase after the antislide pile. At the potential sliding zone, the axial force of the anchor cable will increase suddenly under the action of earthquake; after the earthquake, the initial prestress of the anchor cable will be lost, with the loss range of 7.0%∼23.0%. These test results would provide an important reference for the further study of the seismic performance of such composite support structure.