考虑次生裂隙结构面发育条件下的膨胀土边坡稳定分析

次生裂隙结构面发育是导致膨胀土边坡失稳的主要原因之一,一旦其发育并在坡体吸水膨胀的作用下将普遍导致边坡沿结构面的滑坍破坏。以＂南友＂高速公路宁明段膨胀土路堑边坡稳定分析为实例,重点考虑裂隙结构面的强度因素,采用ANSYS软件的热-力耦合计算功能模拟边坡的降雨入渗以及产生的膨胀力并采用有限元强度折减法对不同条件下边坡的安全系数进行大量计算,发现了一定的规律。次生裂隙面发育后的边坡安全系数较低,有效处治是必要的。

Analysis on Expansive Soil Slope Stability of Epigenetic Fissured Structural Plane Deformation

The development of epigenetic fissured structural plane is one of the main reasons for instability of expansive soil slope.When the fissures develop and soils in the slope swell due to absorption of water,the slope slide structure plane usually occurs.Taking slope stability analysis of an expansive soil slope at Ningming section of ＂NanYou＂ expressway as an example,thermal-stress couple module of ANSYS is used to simulate the rainfall seepage and swelling force of slope and finite element strength reduction method is used to calculate slope safety factor under different condition.In the analysis,the epigenetic fissure structural plane＇s strength is considered as an important factor.Some regularity is obtained.Due to the development of epigenetic fissured structural plane the slope safety factor is low.For this reason the effective treatment is necessary.