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Outline
To rapidly evaluate the stability of tailings dams in flood season, the safety factor and reliability indices were selected to define the critical state of tailings dams. After unsaturated seepage analysis and limit equilibrium analysis, a safety evaluation method for tailings dams in flood season was proposed based on the Critical Rainfall Pattern Curve (CRPC). An orthogonal test results show that the physical parameters of effective internal friction angle φ′, saturated hydraulic conductivity Ks, V-G model fitting parameter a, effective cohesion c′ of tailings sand, and V-G model fitting parameter n were in a descending order in terms of their influences on safety factor-based CRPC. The parameters of c′, φ′ and Ks mainly control the horizontal variation of CRPC, while the parameters of a and n dominate its vertical variation. On this basis, φ′, Ks, a and c′ are selected to establish the reliability index-based CRPC. Parameter analysis results indicate that the area of the stable region of the reliability index-based CRPC gradually decreases with the increase of the coefficient of variation (COV) of c′, φ′, Ks and a, among which the COV of φ′ exerts the most significant impact. Based on the measured rainfall records in flood season, two types of CRPC were adopted to assess tailings dam stability and early-warnings were provided. Based on comparison with the statistical data from local safety monitoring departments, it is recommended that the safety factor-based CRPC method be adopted when the statistical characteristics of soil parameters are unknown.
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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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