Wang Meiqian, Liu Wenlian, Liu Haiming, Xu Wei
Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, 650500, Yunnan, China.
Intelligent Infrastructure Operation and Maintenance Technology Innovation Team of Yunnan Provincial Department of Education, Kunming University of Science and Technology, Kunming, 650500, Yunnan, China.
Sci Rep. 2024 Nov 2;14(1):26399. doi: 10.1038/s41598-024-77169-0.
In this research, the Yuxi section of Central Yunnan Water Diversion Project in Southwest of China, including the tunnel and the traversed sandy dolomite along its route, was selected as the research area, and different sandification degrees classification, including strongly sandy, medium sandy, and weakly sandy, were collected. A comprehensive suite of geotechnical tests was conducted, which included CT scanning, cathodoluminescence, density, porosity, softening coefficient, saturation coefficient, point load test, and uniaxial compressive strength (UCS) test. The Point load index (I) model for predicting UCS of different sandification degrees dolomite under dry and saturated conditions were analyzed by least square regression, and the empirical equation with correlation coefficient (R) between 0.7372 and 0.8347 are obtained. To evaluate the performance of the prediction model, some statistical parameters, including MAE, MSE and RMSE, are calculated to evaluate the effectiveness of the empirical equation. The results of this study indicate that the point load test is one of the reliable methods for estimating the UCS of sandy dolomite under both dry and saturated conditions. Furthermore, the results of the point load test on sandy dolomite hold significant reference value for their practical application and promotion in the field, suggesting a broader utility in engineering practice.
本研究选取中国西南部滇中引水工程玉溪段，包括隧道及其沿线穿越的砂质白云岩作为研究区域，并采集了不同沙化程度分类的样本，包括强沙化、中沙化和弱沙化样本。进行了一系列综合岩土试验，包括CT扫描、阴极发光、密度、孔隙率、软化系数、饱和系数、点荷载试验和单轴抗压强度（UCS）试验。通过最小二乘法回归分析了预测不同沙化程度白云岩在干燥和饱和条件下UCS的点荷载指数（I）模型，得到了相关系数（R）在0.7372至0.8347之间的经验方程。为评估预测模型的性能，计算了一些统计参数，包括平均绝对误差（MAE）、均方误差（MSE）和均方根误差（RMSE），以评估经验方程的有效性。本研究结果表明，点荷载试验是估算干燥和饱和条件下沙质白云岩UCS的可靠方法之一。此外，沙质白云岩的点荷载试验结果在实际应用和推广中具有重要参考价值，表明其在工程实践中具有更广泛的实用性。
