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非均匀变形域中先存构造活动性的判定

, PP. 158-168

Keywords: Anderson模式,先存构造,非均匀变形,活动性系数,砂箱实验

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Abstract:

?Anderson模式只适用于均匀弹性变形域,无法解释自然界中复杂的断层作用现象,实际应用中有很大的局限性.本文结合砂箱实验成果和库仑-摩尔准则,分析基底先存构造的活动性,提出了判定先存构造活动性的力学参数—活动性系数(faS),它由先存构造的产状和力学性质以及应力状态(主应力的大小和方向)等方面决定.该参数考虑到地质体的非均质性(先存构造),建立了先存构造活动性的定量判据.通过先存构造活动性系数将库仑-摩尔准则扩大至有先存构造的非均匀变形域,预测了先存构造活动性的一般规律,从理论上揭示了裂陷盆地断层复杂性的实质,确定基底先存断裂对裂陷盆地断层形成和演化的控制作用规律,并用砂箱实验进行了验证,为断裂作用的深入研究提供了新的途径.

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