The cold-heat cycle underground is closely related to the hydrogeological characteristics of various rock and soil stratum (aquifer) when groundwater source heat pump system is running.
地下水源热泵系统运行期间，地下冷热量循环过程与地下不同岩土层（含水层）的水文地质特征密切相关。
2
The length of time the rock safely can be left unsupported will greatly effect the overall drifting-operation cycle.
岩石开挖后无支护而且安全的时间长度，即拱桥作用的时间，对于整个平巷掘进工艺循环有着很大的影响。
3
The big differences exist for the influence of different aqueous solution, different rocks, different immersion ways and different velocity of cycle flow on the fracture mechanics effects of rock.