地球引力引起的地壳应力

CRUSTAL STRESS ARISING FROM GRAVITY

本文计算了地球在引力作用下,弹性变形、塑性变形两种不同变形情况下的地壳应力状态。计算结果表明:引力作用下地壳的弹性变形伴随着巨大的水平地应力,而铅直应力则小于上覆岩层的重量;应力的大小远远超过岩石的强度;塑性变形所伴随的地壳应力状况(包括铅直应力及水平应力)在浅部与地应力实测值很一致。计算表明,除构造运动等因素外,引力作用同样会引起强大的地壳水平应力,地壳现代的应力状态应与引力作用下地壳的塑性变形有密切关系。

In this paper the authors calculate the stress state in the crust acco- mpanied respeotively with elastic deformation and plastic deformation due to gravity. The caloulation shows that for elastic deformation the horizontal stress is so great that far exceeds the strength of crustal rooks with vertical stress less than the weight of the overburdon and for plastic deformation both horizontal stress and vertical stress are in good agreement with in-situ stress measurements at shallow depths. The authors believe that gravity may cause huge horizontal stress independent of that from tectonic movement and that the current state of stress in the crust should be closely related to plastic crustal deformation due to gravity.