Abstract
Rock slope instability by earthquakes results in substantial economic and property losses. The calculation method of interlayer load and stability coefficient of horizontal complex layered rock slopes in high-intensity areas is established from material mechanics, fracture mechanics, and dynamics. The stability of horizontal layered dangerous rock is calculated after combining it with PFC simulation technology to verify the rationality of the calculation in the Wenchuan area of Sichuan Province. The dynamic response characteristics of dangerous rocks under different weathering degrees are also analyzed. The results show that both methods have an excellent early warning effect on earthquake dangerous rocks. Among the PGA amplification factors, Model 1 has a relatively uniform distribution, Model 2 has a zigzag distribution, Models 3 and 4 have a “U”-shaped distribution, and the most severe acceleration dynamic responses are 4-1 and 4-2 rock blocks. The dynamic acceleration response of mudstone is affected by the crack propagation process of the upper sandstone and exhibits a particular elevation amplification effect. The peak stress gradually decreases with the increase in weathering and elevation. The stress change of the inner chain No. 2 in the horizontal x and y directions is severe, and the stress response of the outer chain No. 1 in the vertical z-direction is severe. It recommends that earthquake disaster protection projects should pay attention to the impact of low-frequency (0–10 Hz) and high-frequency (250 Hz) earthquakes on slope stability.
Highlights
According to the survey, sedimentary rocks with layered structures account for 66.7% of the total land area and around 77% in China
In the layered rock mass engineering, the horizontal layered dangerous rock earthquake disaster prevention and treatment is a project often encountered in the construction of highways, railways, water conservancy, and other infrastructures
Different structural planes cut the rock mass when the main control structural plane at the rear of the dangerous rock block gradually penetrates until it breaks under the action of multiple factors, and the slope will be unstable and destroyed. e existing studies mostly focus on the instability and failure of the rock slope in the nonseismic area under the action of gravity; the dynamic response of the horizontal layered rock slope under the earthquake action needs to be solved urgently
Summary
Sedimentary rocks with layered structures account for 66.7% of the total land area and around 77% in China. E horizontal layered dangerous rock is the primary carrier of the earthquake-type slope instability disaster among them. E existing studies mostly focus on the instability and failure of the rock slope in the nonseismic area under the action of gravity; the dynamic response of the horizontal layered rock slope under the earthquake action needs to be solved urgently. Chen et al [24] realized the particle flow simulation of the fracture propagation of the single dangerous rock main control structure surface and the stability evaluation of the dangerous rock. Is study has essential scientific guiding significance and practical value for the dynamic stability evaluation and prediction of such dangerous rock slopes under the action of an earthquake The time-frequency characteristics of dangerous rocks are analyzed by HHT. is study has essential scientific guiding significance and practical value for the dynamic stability evaluation and prediction of such dangerous rock slopes under the action of an earthquake
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