一、地壳的应力状态现在积累了大量资料,证明在地壳表层确实存在有天然应力场,且其数值相当可观。在现代侵蚀剖面剥露区的坚硬岩石中,有大量方向规则的所谓卸载裂隙或回抗裂隙存在,正是坚硬岩石应力很大的表现。在地壳内3—5公里范围内,存在许多地质现象,如油气田中异常高的油气压力,煤田和金属矿床中的许多崩落现象以及“岩爆”,冲击地压和伴随天然应 First, the stress state of the crust now accumulated a large amount of data to prove that there is indeed a natural stress field in the crust surface, and its value is considerable. There are a large number of directional rules of so-called unloading cracks or recoil fractures in the hard rock of the exposed area of ​​the modern erosion profile, which is a very strong indication of the hard rock stress. There are many geological phenomena within 3-5 km of the Earth’s crust, such as unusually high oil and gas pressure in oil and gas fields, many clumps in coal and metal deposits, and “rockburst”, rock burst and natural