无机处治风积沙强度特性及工程应用研究

Study of strength characteristics and engineering application of inorganic treated aeolian sand

为探究无机处治风积沙的工程特性,通过室内试验开展了3种无机胶结料处治风积沙的7d回弹模量和无侧限抗压强度研究,明确了其强度特性和适用性.研究结果表明:随胶结料含量增加,3种处治风积沙回弹模量均增大,其中二灰处治效果最优,其次是水泥石灰处治和石灰处治;随着胶结料含量增加,水泥石灰和二灰处治的风积沙无侧限抗压强度均增大,而石灰处治的则随灰剂量增加先增大后减小,其中水泥石灰处治效果最佳,其次是石灰处治和二灰处治.综合分析强度特性,建议可将水泥石灰处治作为风积沙地区路基最优处治方法,并将其作为高等级公路的底基层和低等级公路的基层;石灰处治风积沙亦可作为低等级公路的底基层和风积沙地区路基,而二灰处治则对风积沙路基处治效果最好.

To explore engineering characteristics of inorganic treated aeolian sand,laboratory tests are carried out to study 7 days resilient modulus and unconfined compressive strength of three kinds of inorganic binders treated aeolian sand.Their strength characteristics and applicability are cleared.The research results show that the resilient moduli of three kinds of inorganic binders treated aeolian sand increase with the increase of binder content.Among which two ash treatment effect is the best,followed by cement lime treatment and lime treatment.With the binder content increasing,unconfined compressive strengths of cement lime and two ash treated aeolian sand increase,and the unconfined compressive strength of lime treated aeolian sand increases firstly and then decreases with the increase of ash dosage.Among them,the cement lime treatment effect is the best,followed by lime treatment and two ash treatment.Therefore synthesizing strength characteristics analysis,it is suggested that cement lime treatment can be used as optimal treatment method for subgrade and applied to high-grade highway sub-base and low-grade highway base in aeolian sand area.Lime treated aeolian sand can also be used as the sub-base of low-grade highway and subgrade in aeolian sand area.And two ash treatment effect is best for aeolian sand subgrade.