非饱和土大气张力通用公式与地基压缩变形初探

摘要

提出了“土的压缩变形的变化只取决于有效应力的变化的观点是不成立的。自由水和孔隙气同样具有抗压能力，地基压缩变形应该用总应力计算。有效应力的实质是自由水和孔隙气没有抗剪能力。在抗剪极限状态，颗粒接触有效应力为法向压力，结合水膜和表面张力收缩膜贡献有效应力为法向拉力”。推出了非饱和土大气张力z方向时间应变率表达式。推出了抗剪极限状态非饱和土有效应力的大气张力通用公式。提出了渗流体的“等效压缩模量”的新概念。%This paper put forward “The point of view that changes of soil compression deformation is determined only by the change of effective stress is not set up.Free water and pore gas also has ability to work under pressure.The foundation compression deformation should use total stress calculation.The essence of effective stress is free water and pore gas no shear capacity.In shear limit state,particle contact effective stress is normal pressure,effective stress of combined water film and the surface tension of contraction film contribution is normal tension”.This paper introduced the z direction time strain rate expression of unsaturated soil atmosphere tension.This paper introduced the general for-mula of the atmosphere tension of effective stress of unsaturated soil when shear limit state.The new concept of equiva-lent modulus of compression of the seepage body is put forward.