用计算方法确定砂、卵石侧限压缩模量

To Determine the Oedometric Modulus of Sand, Gravel by Calculation

本文根据北京市城、近郊区取得的60份砂土试样及24份探井中砂充填卵石试样的筛分试验结果,按照B.O.Hardin一维'1/e～σ_v′'模型计算出无粘性土在不同有效覆盖压力与附加压力作用下的孔隙比e,从而计算求得其压缩指数C_C值及侧限压缩模量E_S。经与57组砂土室内压缩模量E_S统计值验证比较,计算结果与实验统计结果十分相符。对于北京地区粘性土与无粘性土多次旋回沉积地层,取得砂土及砂充填卵石的侧限压缩模量对地基进行不均匀性判定及变形计算具有重要意义。

The void ratio e of noncohesive soil under different effective overburden pressure and additional pressure is calculated according to B.O.Hardin's one-dimensional '1/e～σ_v'' model based both on sieve testing results of 60 sandy soil samples taken from urban and sururban eistricts of Beijing and on those of 24 sand filling gravels samples taken from sample pits. Then the compression index C_C and oedometric modulus E_S are acquired. The calculated results conform with the statistical results after comparing with 57 groups of oedometric modulus of sandy soil gained in laboratory.To get the oedometric moduli of sandy soil and sand filling gravels for the multicyclic depositional stratum of cohesive and noncohesive soil in Beijing districts are essential for judgment of inhomogeneity of foundation and for the calculation of deformation.