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一、以往对孔隙压力的研究情况土坝填筑时,由于坝身及坝基的粘性土壤孔隙中存在水和空气,当填土荷重增加,土体发生压缩,但粘性土壤的渗透系数很小,受荷重后水和空气不能很快排挤出去,所以在开始加荷时,土体压缩完全由空气的压缩而产生。空气体积受压缩时,其压力则按照波义耳定律而增加,这是非饱和土体孔隙压力产生的缘由。如果坝体和坝基是饱和土体,填土荷重增加时,其增加的全部荷重,将完全被孔隙压力所承担。而孔隙中的水,由于孔隙压力的挤压,逐渐向外排出,因而随着时间的延续,孔隙压力逐渐减低,荷重就逐渐转嫁到土体颗粒上。
First, the previous study of pore pressure Embankment filling, due to dam and dam foundation of the sticky soil pores in the presence of water and air, when the filling load increases, soil compression occurs, but the permeability of cohesive soil is very small, After the load water and air can not be quickly squeezed out, so at the beginning of loading, soil compression is completely compressed by the air generated. When the volume of air is compressed, the pressure increases according to Boyle’s law, which is the reason of pore pressure in unsaturated soils. If the dam body and the dam foundation are saturated soil, the total load that is added when the filling load increases will be completely borne by the pore pressure. The pore water, due to pore pressure squeeze, gradually discharged outward, so as time goes on, pore pressure gradually reduced, the load gradually passed on to the soil particles.