求翻译：随着矿山开采深度不断增加，地质条件由简单到复杂，岩层裂隙和断层构造也愈来愈多，矿井地压及水平向地应力明显增大，地应力愈来愈复杂。巷道围岩变形量增速加快，巷道的掘进和支护都显得十分困难。在复杂应力下如何有效而且经济地保持巷道和大断面硐室的稳定性，成为巷道施工和支护中一个必须认真探究的课题。是什么意思？

With the increasing depth of mining, geological conditions, from simple to complex, more and more rock fissures and fault structures, mine ground pressure and the level of gravitropic stress significantly increased, to stress more and more complex. Surrounding rock deformation growth accelerated, th

With increasing depth mining exploitation, geological conditions, from simple to complex rock fractures and faults are also more and more construction, mine weighs heavily and to increased stress, strain, and more and more complex. Gallery of rock deformation is an acceleration of the laneways, bori

Increases unceasingly along with the mine mining depth, the geological condition from arrives simply complex, the rock layer crevasse and the fault structure increasingly are also many, the mine pit geostatic pressure and the level increase obviously to the crustal stress, the crustal stress is incr

As the mining depth increasing from simple to complex geological conditions, rock fractures and fault structure is also more and more, to the stress level of mine ground pressure and increases in stress are increasingly complex. Roadway surrounding rock deformation of the pace, excavation and suppor

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