摘要
通过在Jacob假定下推导储水率与多孔弹性介质的物理力学常参数之间的联系,发现储水率的骨架弹性贡献部分为与时间无关的常数。进一步推导发现地面沉降与地下水头降深之间具有线性关系。其中水头降深是地面沉降的主动因素,足外因;骨架弹性储水率和储水层厚度是被动因素,是内因。三种因素对地面沉降部做正比贡献。对地表某一确定点而言.由于骨架弹性储水率和储水层厚度相对稳定,地面沉降与地下水头降深成正比,地表以下全部垂向形变储水层的综合骨架弹性储水系数为其比例系数。相同的水头降深可以带来不同的地面沉降,也就是说,地面沉降漏斗相对于地下水头降落漏斗可能会有不同程度的偏离,这是由于平面上各点处的垂向压缩土层的厚度及综合骨架弹性储水系数不尽相同所致。地面沉降与地下水头下降之间普遍呈现显著线性相关关系的事实反过来表明,储水层的垂向释水压密变形规律基本符合Jacob假定;其线性比例系数应为地表以下所有形变储水层的综合骨架弹性储水系数。
Expressions for inherent relationship between specific storage and some constant physical-mechanical parame-ters under Jacob assumptions m porous medium were developed. The result shows that the skeletal elasticity contribution of specific storage is constant with respect to time. Further derivation leads to a linear relationship between land subsidence and aquifer drawdown. The relation shows that land subsidence is controlled by three factors-two formation factors, the skeletal e-lasticity of specific storage and thickness, and one man-made factor, aquifer drawdown. The drawdown is initiative factor and the rests are passive. All these factors contribute proportionally to land subsidence. For certain point on the ground, land subsidence is directly proportional to aquifer drawdown, and the comprehensive storage coefficient of skeletal elasticity of all the vertical deformation layers under ground should be the coefficient of proportionality. The same drawdown sometimes can bring different amount of subsidence so as to result in land subsidence bowl bias a little from the drawdown funnel mainly because the thickness and specific storages of the vertical deformation layers under the ground vary remarkably in horizontal direction. The actually ubiquitous linear correlations between land subsidence and aquifer drawdown conversely indicate that vertical compaction of water-bearing formations agrees with the vertical elastic deformation assumption. The proportional coefficient in the lin ear correlation should be the comprehensive storage coefficient of skeletal elasticity of all the vertical deformation layers under the ground.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2005年第3期393-399,共7页
Chinese Journal of Hydrodynamics
基金
教育部科学技术研究重点项目(105168)
