Full
Outline
To explore the damage degradation and landslide instability mechanism of weathered red-bed soft rock under the action of acid rain, the stress-seepage coupling creep test of red-bed soft rock under repeated erosion of acid solution was carried out, and the mechanical behavior and damage evolution mechanism of rock coupling creep were analyzed. By analyzing the time-strain curve of rock creep under different test conditions and the relationship between rock creep rate and permeability before and after hydrochemical damage, the mechanism of rock damage degradation under the coupling of chemical-stress-seepage and the main factors affecting rock damage were explored. The results show that the hydrochemical action will reduce the triaxial strength of the rock, with a minimum reduction of 36.31% and a maximum reduction of 48.03%. At the same time, the rock creep curve after repeated erosion by hydrochemical action is more divergent. There is a good positive correlation between rock damage law and stress level under different hydraulic conditions. The degree of hydrochemical damage is much higher than that of seepage and stress. After hydrochemical damage, rock seepage and stress will aggravate rock damage degradation. Under the action of high seepage pressure, the creep effect of rock is more obvious. Finally, the chemical damage factor is introduced to establish a triaxial nonlinear damage creep model under the stress-seepage coupling effect including chemical damage, which can describe the fluid-solid coupling creep characteristics of red-bed soft rock under the action of hydrochemical action, and the fitting effect is good.
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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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