Instability mechanism research on anti-orientation strata slope with alternating layers of hard and soft rock

Toppling deformation or bending of slope is very common in the mountain valley composed of alternating layers of hard and soft rock, one of major instability modes of anti-orientation strata slope with alternating layers of hard and soft rock composition. Through the systematic investigation of field engineering geological conditions of Shawozi highway slope, the stratigraphic lithology, the rock mass structure types, the combination characteristic between structures with slope surface, and the main factors affecting slope stability were detailed studied. In combination with the engineering geological conditions, analysis of its deformation and failure mechanism are discussed deeply, this paper reveals the composite tensile failure modes including toppling-cracking (bending) and slipping-cracking. Based on the analysis of the deformation mechanism, corresponding control measures and recommendations is put forward, providing the reference for similar highway slope.