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石灰在榆佳高速公路某路段用来处理黄土路基的湿陷性。为了准确获取路基石灰稳定土在车辆荷载作用下的动力学参数,采取扰动土样,进行标准击实试验,制作标准重塑试件,利用DDS-70循环三轴试验系统,测试了1Hz、2Hz、3Hz和5Hz振动频率(固结比2.0,含水量26.0%、21%、13%,围压50kPa),1.0、1.5、2.0、2.5、3.0、4.0固结比(围压50kPa,振动频率3Hz),100、150、190、200kPa动应力幅值(固结比2.0,含水量26.0%、21%、13%,围压75kPa,循环次数5 000次,振动频率3Hz)等条件下石灰土的动应力—应变关系。试验表明:石灰土的阻尼比随着频率的增加而增加,动弹模量对频率不敏感;石灰土的阻尼比随着固结比的增加而减小,动弹模量则与固结比正相关;随着振动次数的增加土体动弹模量会有减小的趋势,但这种趋势会随着含水量的降低和动应力的减小而持续减弱。
Lime in Yujia Expressway section of a section used to deal with loess subgrade collapsibility. In order to obtain the dynamic parameters of subgrade lime-stabilized soil accurately under vehicle load, the soil sample was taken as disturbance and the standard compaction test was carried out to make the standard remodeling test specimen. The DDS-70 cycle triaxial test system was used to test the dynamic parameters of 1Hz, 2Hz , 3Hz and 5Hz vibration frequency (consolidation ratio 2.0, water content 26.0%, 21%, 13%, confining pressure 50kPa), 1.0,1.5,2.0,2.5,3.0,4.0 consolidation ratio (confining pressure 50kPa, vibration frequency 3Hz ), 100,150,190,200 kPa dynamic stress amplitude (consolidation ratio 2.0, water content 26.0%, 21%, 13%, confining pressure 75kPa, the number of cycles 5000 times, vibration frequency 3Hz) under the conditions of lime soil Dynamic stress-strain relationship. The results show that the damping ratio of lime soil increases with the increase of frequency, and the dynamic elastic modulus is insensitive to frequency. The damping ratio of lime soil decreases with the increase of consolidation ratio, and the dynamic modulus is positively correlated with the consolidation ratio . With the increase of vibration frequency, the dynamic modulus of soil will decrease, but this trend will continue to decrease as the water content decreases and the dynamic stress decreases.