On the base of the experiment, through analyzing a large of experiment data, deduce the COD degradation dynamics on the steady condition, define the dynamics parameter k.
On the base of studying the geological origin, a lateral stress ratio K is also propsed in this paper as a criterion for evaluating the stability of these two zones.
本文在分析地应力的地质成因的基础上，还提出用岩体地应力的侧压比值K作为评价的准则。
3
On these premise, we mainly discuss these properties of weak bases and got the following results:(l)weak base is "hereditary" with respect to k-subspace;