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Outline
Reasonably and effectively determining the uniaxial compressive strength of rocks is of great significance for ensuring the safety of mining rock engineering. Based on two groups of rock uniaxial compressive strength datasets including longitudinal wave velocity, Schmidt hammer rebound value, point load strength, Schmidt hardness, and other indirect indicators, four combination algorithms including PSO-BP, PSO-LSTM, CNN-LSTM, and PSO-BILSTM, were selected. And the optimal rock uniaxial compressive strength prediction algorithm was comprehensively evaluated through 7 evaluation indicators. The results show that the PSO-LSTM algorithm fits well with the predicted values and actual values on two datasets, and all evaluation indicators are high. Based on the metric scoring method to quantitatively analyze the predictive performance of various algorithms, PSO-LSTM can achieve a total high score of 27 and 21 on Dataset 1 and Dataset 2, respectively, demonstrating the highest prediction accuracy. The analysis of input parameter correlation shows that the point load strength has the greatest impact on the prediction of uniaxial compressive strength in Dataset 1, with a correlation degree of 0.735 5. The tensile strength has the greatest impact on the prediction of uniaxial compressive strength in Dataset 2, with a correlation coefficient of 0.829 2. Meanwhile, the predictive performance of each algorithm in Dataset 2 is better, indicating that using input parameters with high correlation with uniaxial compressive strength can effectively improve the predictive performance. The research results can provide a reference for determining the uniaxial compressive strength of rocks.
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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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