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通过筛分试验、干振试验、水振试验、标准击实试验、压缩试验分析了六种不同级配风积沙样的压实特性与压缩特性。结果表明:毛乌素地区风积沙超过94%颗粒粒径集中在0.5~0.25mm范围内,不均匀系数Cu为1.32,细度模数Mx为1.74,曲率系数为1.05,属不良级配中沙。由三种试验得到的最大干密度的情况为:水振试验>标准击实试验>干振试验。水振试验达到最大干密度所用时间为1min左右,干振时间为7min。毛乌素地区风积沙的标准击实试验曲线形状呈先凹后凸形的S型曲线,风积沙在干燥状态下和含水量为w=10~12%情况下均可被压实。原始沙的压缩试验表明,砂性土也存在着对时间的滞后效应并且该沙样的压缩性较差。
The compaction and compression characteristics of six different grades of aeolian sand samples were analyzed by sieving test, dry vibration test, water vibration test, standard compaction test and compression test. The results show that more than 94% of the aeolian sand particles in the Mu Us region are concentrated in the range of 0.5-0.25 mm, Cu of the ununiformity coefficient is 1.32, the modulus of fineness Mx is 1.74 and the curvature coefficient is 1.05. The maximum dry density obtained from the three tests is: Water Vibration Test> Standard Compaction Test> Dry Vibration Test. Water oscillation test to achieve the maximum dry density time is about 1min, dry vibration time of 7min. The standard compaction test curve of aeolian sand in Mu Usu area shows a S-shaped curve with convex concavity and convexity. Aeolian sand can be compacted in the dry state and with water content of w = 10-12%. Compressive tests of the pristine sand show that there is also a hysteresis effect on sandy soil and the sand sample is less compressible.