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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。
Based on the screening test results of 60 sand samples obtained in Beijing city and near suburbs and 24 sand samples filled with pebbles in the exploratory wells, the calculations are based on BOHardin’s one-dimensional“1/e~σ_v’” models. The void ratio e of the cohesive-free soil under different effective covering pressures and additional pressures was calculated to obtain the compression index C_C value and the confined compression modulus E_S. Comparing with the statistics of the E_S statistical value of the sand soil in the 57 groups, the calculated results are in good agreement with the experimental statistics. For the multi-cycle sedimentary stratigraphy of cohesive and cohesive-free soils in Beijing, it is of great significance to obtain the lateral compressive modulus of sand and sand-filled pebbles to determine the inhomogeneity and calculate the deformation of the foundation.