坡间路基挡土墙“双锚”建设方案评价及参数优化数值模拟

Assessment on double anchor construction project of subgrade retaining wall on slope and its parameters optimization with numerical simulation

坡间路基挡土墙是所有挡土墙结构形式中建设难度最大且最易失稳的结构形式。结合栖莱高速公路K59+470～K59+630半填半挖段路基建设问题,提出坡间挡土墙“双锚”建造方案。通过数值模拟,对“双锚”方案的工艺参数进行研究和优化,并对典型剖面的“双锚”方案建造效果进行整体评价。结果表明:该方案在路面静载和动载作用下均可保持稳定,满足相关规范要求,达到工程预期效果。方案实施后监测结果表明:挡土墙处于稳定状态,表明该技术对于坡间挡土墙建设具有广泛的推广和应用价值。

Retaining wall on slope is a structure very difficult to construct and easy to failure. Combined with a filled and excavated subgrade construction of section K59＋470-K59＋630 of Qixia-Laixi Expressway in Shandong Province, a double anchor construction project was put forward. The parameters of the construction was studied and optimized by use of numerical simulation methods. At the same time, the behaviour of typical section of the project was assessed. It was shown that the subgrade remained stable under static and dynamic load, and the project could meet the requirement of the relative criteria and expected effect was obtained. The inspection results after the construction showed that the retaining wall was stable, and the technique of double anchor construction project could be used as a reference for similar projects.