【作者】 李驰； 于浩；

【Author】 LI Chi YU Hao (Inner Mongolia Univ of Technology,Huhhot,Neimenggu 010051)

【机构】 内蒙古工业大学建工学院；

【摘要】 针对沙漠风沙土非塑性、易流动性和抗风蚀稳定性差的特点。以库布其沙漠风沙土为例,采用粉状土固化剂对其进行加固.对固化风沙土的抗剪强度及其影响因素进行试验研究.结果表明,同样条件下PX固化剂在提高固化风沙土抗剪强度性能方面优于水泥固化剂.以PX固化剂为例,分析了固化风沙土抗剪强度指标与固化剂掺量的关系,当固化剂掺量为8%时,固化风沙土的粘聚力和内摩擦角均达到最大,在相同竖向附加应力作用下,固化风沙土抗剪强度大约是风沙土抗剪强度的1.6倍.进而,以掺量8%的PX固化剂为例,在标准养护条件下养护3 d、7 d和14 d,发现随养护龄期的增加,固化风沙土的抗剪强度增大,特别是粘聚力增加明显并最终趋于稳定,因此固化风沙土适宜的养护龄期为7 d.更多还原

【Abstract】 Because of the non-plastic,fluidity,and poor stability against wind erosion,aeolian sandy soil,re- trieved from Hobq Desert,have reinforced by powdery stabilizer.Some studies on the shear strength as well as its affecting factors of solidified aeolian sandy soil are made in this paper.There are several results as follows. Firstly,the results show the PX soil stabilizer is better than cement on improving the shear strength of solidified aeolian sandy soil in the same situation.Then,the connection between the shear strength index and the mass percentage of the PX soil stabilizer are analyzed.Both cohesive force and internal friction angle reach the max point while the percentage is 8%.For same vertical subsidiary stress condition,the solidified aeolian sandy soil’ s shear strength is almost 1.6 times as high as the aeolian sandy soil.Furthermore,the soil samples which the percentage of the PX soil stabilizer is 8% were maintained in standard condition for 3 d,7 d and 14 d,the result indicated that the shear strength is higher as the maintenance age is longer.Especially,cohesive force improves obvious in initial maintenance,but the increment goes stable along with the ages prolong.So the proper mainte- nance age is 7 d.更多还原