川藏公路田妥—怒江段某滑坡稳定性分析与整治

Stability Analysis and Regulation of the Landslide in Tiantuo to Nujiang Section on Sichuan-Tibet Highway

结合国道318线川藏公路田妥一怒江段K3668+700～K3668+790滑坡的基本状况,对滑坡的成因进行了分析。对K3668+715断面建立了有限元分析模型,利用有限元强度折减法,计算分析了该段滑坡在重力场和地震作用下的稳定性,计算分析求得该滑坡整治前在重力场和地震作用下的稳定安全系数分别为0.99和0.93,滑坡处于不稳定的滑动状态,应及时对该段滑坡进行整治。提出了合理的整治方案并进行了安全性评价,结果表明整治后滑坡的安全系数大于设计安全系。

With a combination of basic conditions for the landslide in section from Tiantuo to Nujiang on Sichuan-Tibet State Road 318, that is K3668 ＋ 700 - K3668 ＋ 790, the causes of the landslide have been analyzed. The finite element analysis model of the landslide in K3668 ＋ 715 section is established. The stability of the landslide in gravitational field and earthquake has been analyzed by using the finite element strength reduction method. The calculation indicates that the safety coefficients of the landslide in gravitational field and earthquake respectively are 0.99 and 0.93 respectively before regulation. So the landslide is in an unstable state and the regulation project should be taken in time. Advisable regulation scheme of the landslide is put forward and the results show that the stability safety coefficients are greater than the design ones after the regulation.