复合厚硬顶板结构演化规律及水力压裂结构调控防冲机制

doi:10.3724/1000-6915.jrme.2026.0086

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Abstract To address the low accuracy of tunnel water-inrush prediction under complex geological conditions and the difficulty in capturing the nonlinear relationships among disaster-inducing factors, an intelligent prediction framework driven by ensemble learning is proposed. Based on a review of 249 documented water-inrush disaster cases in China and abroad, 22 disaster-inducing factors were selected. The synthetic minority over-sampling technique (SMOTE) was employed to overcome the class imbalance of the minority-class data, and principal component analysis (PCA) combined with K-means clustering was used to establish a hazard assessment system. A stacked generalization (SG) strategy was then adopted to integrate a random forest (RF) model and a backpropagation neural network (BPNN) to construct the prediction model, and the analytic hierarchy process (AHP) was further introduced to identify the key disaster-inducing factors. The results show that: (1) By exploiting the complementary error characteristics between the base learners, the SG model achieves a coefficient of determination (R2) of 0.98, a mean absolute error (MAE) of 0.68 and a mean square error (MSE) of 0.87, and its overall prediction performance and generalization ability are superior to those of a single base learner. (2) For major water-inrush cases with water-inflow volumes exceeding 300 m3/(d•m), the relative prediction error of the SG model remains stably within 10%, which effectively reduces the prediction fluctuations of a single base learner in the high-flow range. (3) Based on the initial weights obtained from the RF model and the correction made by engineering judgment, the AHP identifies the hydraulic conductivity, adverse geological conditions, geological structure, negative landform and groundwater occurrence conditions as the five core disaster-inducing factors, with a cumulative weight of more than 48.56%. These findings provide a relatively reliable technical approach for water-inrush disaster prevention and early warning in underground engineering.

Key words： mining engineering composite thick and hard roof structural evolution law hydraulic fracturing structural control rockburst

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	ZHANG Suilin
	ZHANG Junwen*

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ZHANG Suilin,ZHANG Junwen*. Structural evolution of composite thick-hard roofs and rockburst control mechanism by hydraulic-fracturing-induced structural regulation#br#[J]. , 2026, 45(11): 3420-3440.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2026.0086 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I11/3420

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