黄土坡体节理发育特征和空间分区与边坡稳定性

通过现场调查分析了黄土坡体节理发育特征,节理走向与边坡倾向呈大角度斜交,节理走向受边坡倾向的控制。根据对斜坡不同区域受力分析,台塬区土体主要受到湿陷拉张作用,在斜坡地带土体主要受水平卸荷所产生的推力作用,把斜坡区节理发育分为湿陷节理发育区、拉张节理发育区、挤压节理发育区和开挖卸荷节理发育区。最后,对有无节理边坡进行了稳定性计算,计算结果和理论分析一致。 

Joint development characteristics,spatial division and stability of loess slope

The extensive development of vertical joints is one of the major features in the loess region. The joint destroys the integrity of the loess slope, reduces the slope stability. First of all, through the field investigation and analysis of the characteristics of loess joint development, it was found that joint strike crosses obliquely slope inclination and is controlled by the latter. Secondly, according to the analysis of different regional stress of slope, soil of tableland area is mainly impacted by saturated yielding tension, and soil in the slope zone is mainly effected by thrust produced by horizontal unloading, joint development in slope area is divided into saturated yielding joint development area, tension joint development area, compression joint development area and the joint development area of unloading caused by excavation. Finally, calculation of stability was carried out for slopes with or without joints. The calculation results are in accordance with the theoretical analysis.