基于条块模型法的隧道边仰坡稳定性分析

Stability Analysis of Tunnel Side Slope based on SlicesModel Method

以梅大高速公路梅州东环支线其古顶炭质泥岩隧道为依托,结合现场隧道洞口施工边仰坡滑移开裂的情况,提出一种新的分析边坡稳定性的方法-条块模型法。利用条块模型法建立边仰坡上覆各块体安全系数量化指标,采用条块模型法和瑞典条分法求解算例边仰坡的安全系数,并比较两种方法的优劣。针对坡体失稳破坏的三个不同阶段提出了相应的处置措施。研究结果表明:控制条块为边仰坡上局部安全系数最大的条块,边仰坡安全系数由控制条块的安全系数决定;条块模型法相较于瑞典条分法计算的安全系数更加准确;条块模型法突破了瑞典条分法整体安全系数的局限,能够准确地分析边仰坡的稳定性。

Being based on the ancient top carbonaceous mudstone tunnel of Meizhou EasternRing Branch of Meizhou-Dalian Expressway,combined with the sliding and cracking of the side slope at the entrance of the tunnel,a new method,slices model method,has been proposed to analyze the slope stability.Then,the safety factor of the slope has been calculated by using the slices model method and Swedish slices method,and the advantages and disadvantages of the two methods have been compared.Finally,the corresponding treatment measures have been put forward for the three different stages of slope failure.The results have shown that the control slice is the slice with the largest local safety factor on the slope,and the safety factor of the slope is determined by the safety factor of the control slice.Being compared with Swedish slices method,the safety factor calculated by slices model method is more accurate,the slices model method breaks through the limitation of the integral safety factor of the classical slice method,and can accurately analyze the slope stability.