Abstract
The construction and long-term operation stage of the rock slope with argillaceous interlayer will be subjected to intermittent dynamic loads, such as blasting and earthquake. For the argillaceous interlayer in the rock slope, its rheological properties are not only related to the initial stress state caused by the gravity of the overlying rock mass but also affected by intermittent dynamic loads. In order to investigate the rheological properties of argillaceous intercalation under the combination of static and intermittent dynamic shear loads, the rheological tests of argillic intercalated soil samples under static shear, static and cyclic dynamic shear, and static and intermittent dynamic shear were carried out, and the rheological deformation characteristics of soil samples under different shear conditions were analyzed. The results show that when the soil specimens in the static shear rheological process are disturbed by intermittent dynamic shearing load, the intermittent dynamic disturbances might have no remarkable influence on the rheological deformation of the specimens if the initial static shearing stress and intermittent dynamic shearing stress were comparatively low. However, low-intensity intermittent dynamic disturbances might accelerate the rheological deformation process of the specimens remarkably if the initial static shearing stress state was close to their shearing strength. There was a stress threshold when the soil specimens failed under the static and cycling dynamic shear and static and intermittent dynamic shear, which is determined by the sum of static shear stress and dynamic shear stress peak. For rock slopes controlled by rheological weak structural planes and influenced by long-term blasting vibrations, the transient and long-term dynamic stability should be comprehensively analyzed.
Highlights
Academic Editor: Francesco Bucchi e construction and long-term operation stage of the rock slope with argillaceous interlayer will be subjected to intermittent dynamic loads, such as blasting and earthquake
In order to investigate the rheological properties of argillaceous intercalation under the combination of static and intermittent dynamic shear loads, the rheological tests of argillic intercalated soil samples under static shear, static and cyclic dynamic shear, and static and intermittent dynamic shear were carried out, and the rheological deformation characteristics of soil samples under different shear conditions were analyzed. e results show that when the soil specimens in the static shear rheological process are disturbed by intermittent dynamic shearing load, the intermittent dynamic disturbances might have no remarkable influence on the rheological deformation of the specimens if the initial static shearing stress and intermittent dynamic shearing stress were comparatively low
Low-intensity intermittent dynamic disturbances might accelerate the rheological deformation process of the specimens remarkably if the initial static shearing stress state was close to their shearing strength. ere was a stress threshold when the soil specimens failed under the static and cycling dynamic shear and static and intermittent dynamic shear, which is determined by the sum of static shear stress and dynamic shear stress peak
Summary
Xin Zhang ,1 Qian Dong ,2,3 Xiangping Zhang ,1 Ming Lang ,1 Suzhi Zhao ,1 Zhuoang Chen ,2,3 and Jinshan Sun 2,3. Erefore, it is of great theoretical and practical significance to study the rheological properties of weak structural planes under dynamic loads for improving the long-term stability of rock slope and avoiding landslide failure. There are few studies on the influence of dynamic disturbances on the rheological process of weak structural planes of slope, so that the static evaluation methods are still mainly used to evaluate the long-term stability of rock slope, and only the transient stability analysis method is used to evaluate the dynamic stability of slope For this reason, this paper has carried out preliminary laboratory test research on the rock slope controlled by the weak structural planes under the long-term disturbances of blasting excavation, and the shear rheological characteristics of the weak mud interlayer under the intermittent cyclic dynamic load were analyzed. In order to ensure the stability of the rock slope, after the blasting charge is controlled, the measured particle acceleration on the surface of slope is generally about 0∼3 m/s2 (area far away from the explosion source). at is, the additional seismic inertial forces are about 0∼0.3 times the weight of the overlying rock mass, so the peak value of the additional dynamic stresses in the normal and tangential directions is about 0∼0.3 times the static normal and tangential stresses
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