Based on the analysis of the environmental isotopes of about 100 water samples, the waters in the front plain of the Tainshan Mountain are divided into eight subprovinces on a horizontal plane and four zones in a vertical plane. The characteristics of the recharge, runoff, and water storage of different waters are discussed, and the runoffs in several sections are also calculated. Last, the tentative space-time regulation plan of the water resources is presented on the basis of the study of the environmental isotopes. 相似文献
In order to reduce roadway excavation and effectively control roadway surrounding rock deformation, different combinations of roadway width (4.5 m, 4.8 m, 5 m, 5.2 m), roadway height (3 m, 3.3 m, 3.5 m, 4 m), and arch height (0.3 m, 0.5 m, 0.8 m, 1 m) are selected. Through L16(34) three-factor four-level orthogonal test and numerical simulation, the surrounding rock deformation and plastic zone area evolution after roadway excavation are studied based on FLAC3D. The results show that arch height is negatively correlated with plastic zone area in roadway roof surrounding rock and positively correlated with failure of roadway sides and corners. Further investigation finds the optimal combination to be roadway width 4.5 m, roadway height 3 m, and arch height 1 m. Compared with the original scheme, the new straight-wall arched section reduces plastic zone area by 35.07%, roof subsidence by 19.2% and side displacement by 22.4%. The optimized roadway section effectively reduces the failure range of surrounding rock plastic zone and contributes to long-term roadway stability.
