某大峡谷玻璃桥桥址边坡稳定性分析

The stability analysis of the slope of glass bridge site in a grand canyon

为确保某大峡谷玻璃桥及配套工程建设的安全,基于有限元方法对大峡谷两侧陡立岸坡及拉锚处进行稳定性分析,并对最初设计时的桥址位置是否适宜建设该工程进行评价。采用三维有限元软件,结合现场岩土工程条件,对玻璃桥桥址边坡在天然状态下和桥梁荷载条件下的位移、应力状态进行数值模拟,获得坡体在玻璃桥荷载作用下塑性区的分布规律。研究结果表明:所计算桥址的位置在外力作用下处于欠稳定—不稳定状态,建议改变桥址设计位置或对不良地质作用发育区域的岩体进行加固治理,为某大峡谷玻璃桥的进一步设计提供参考。

Based on the finite element method, the stability analysis of the steep slopes with anchor bars at bothsides of a grand canyon was conducted and the originally designed bridge site was evaluated for the constructionand operation safety of the glass bridge. The plastic zone distribution regulation of the slope under the condition ofglass bridge loading was obtained by simulating the displacement and stress states of the slope under natural andbridge loading conditions. Three dimensional finite element software was used in combination with thegeoteehnical engineering conditions for this purpose. The results show that the position of bridge site was betweenmetastable state and unstable state under the action of external forces. It is suggested to change the design posi-tion of bridge site or reinforce rock mass in regions susceptible to disastrous geological development. This offersreference for the further design of a canyon glass bridge.