论岩体构造应力

On tectonic stress in rock mass

从地质学基本原理、地表地质作用以及实测数据等几个方面再次论述了对岩体构造应力分布的认识 ,指出在水平主应力随深度的线性表达式σ=kh+T中 ,构造应力的贡献不仅只由T反映 ,而且常常对系数k有很大的贡献 .另一方面 ,即便在地形平坦地区 ,T值还可以反映后期地表地质作用 ,最大、最小水平构造应力差值能更好地表征构造应力的大小 .而在地形复杂的河谷地区 ,地表改造对浅层岩体地应力的影响更加突出 ,但可以用河谷形成前等效初始地应力场状态反应构造应力状态 .

The distribution of tectonic stress in rock mass is studied based on the analysis of geological action and measured data.The horizontal stress σ is linearly varied with depth has σ=kh+T ,where k and T are coefficients. Tectonic stress can not only be described by the coefficient T , but also by k. On the other hand, even in flat area. In flat area, T reflects the possible subsequent geological action on the ground surface.Tectonic stress in uneven area can be effectively described by the difference between the maximum and minimum horizontal principle stress.In river valley area,the influence of surface geological action on in\|situ rock stress is remarkable.However,the tectonic stress state can be identified by the original equivalent stress field before the formation of valley.