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In the southwest region of China, the construction of highways has resulted in the formation of many cutting slopes due to the special terrain conditions of the region. Therefore, the stability of highway cutting slopes under earthquake conditions has become a critical issue in the stability evaluation of highway engineering. In this research, the acceleration response of stepped bedding rock slopes is analyzed by conducting large-scale shaking table tests, and the seismic response of each platform is investigated.A ratio of acceleration amplification factor is proposed to characterize the differences in dynamic responses of various slope patterns and analyzes the seismic wave propagation in the slope using Snell’s law. The test reveals that the acceleration amplification factor of the slope exhibits an elevation amplification effect as the amplitude of the excitation increases. When the excitation amplitude exceeds 0.6g, the continuous accumulation of slope shattering damage and the enhancement of the filtering effect lead to a leveling off of the acceleration amplification factor with increasing elevation. Besides, slopes with uniform step width demonstrate better aseismic performance, while stress concentration is more likely to occur at the corners of each step, making them as key fortification sites. The analysis of the monitored acceleration data is consistent with the model damage patterns recorded by a high-speed camera during the shaking table tests. Based on the cumulative shattering damage process of the slope, four stages of damage are identified: shallow creep (0.1g~0.4g), local tension (0.4g~0.6g), accelerated deformation (0.6g~0.8g), and overall instability(0.8g~1.0g), exhibiting a slip-tensile damage mode. The research findings provide essential theoretical support and technical guidance for understanding the shattering damage mechanism and seismic fortification of rock slopes with complex formations and geological structures, and offer a reference for disaster prevention and mitigation measures for stepped bedding rock slopes in mountainous areas.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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