摘要
通过大量的调查试验,揭示了沙漠地区风积沙的主要工程性质:风积沙的粒径为0 25～0 1mm,不均匀系数为1 2～2 0,曲率系数为0 9～1 3,属不良级配,沙粒矿物以石英长石为主,形态以次棱角为主,天然状态下干密度为1 48～1 68g/cm3,内摩擦角31°～39°,压缩系数<0 1等.干密度指标是风积沙压实控制的惟一指标.常规机械按规定工艺碾压使风积沙干密度γd=1 62g/cm3时,风积沙地基变形模量为50～65MPa,承载力标准值fk>0 2MPa.
Based on experimental investigation,the main engineering characteristics of drift sand in desert zone have been revealed in this paper. The grain diameter is 0.25～0.1 mm,the uniformity coefficient 1.2～2.0,the curvature coefficient 0.9～1.3,which is poorly graded sand.The mineral particle is mainly arkose's pyramid,the natural dry density is 1.48～1.68 g/cm^(3). The internal friction angle is 31～39,the compressibility coefficient is 0.1blow.The only control index is the compaction standard. The dry density can be 1.62 g/cm^(3) in conventional mechanical compactor. Then the deformation modulus of the drift sand foundation can be 50～60 MPa,the standard value of bearing capacity f(k) can be 0.2 MPa or more.
出处
《水利水电技术》
CSCD
北大核心
2004年第9期43-46,共4页
Water Resources and Hydropower Engineering
关键词
沙漠地区
风积沙
工程特性
压实标准
desert zone
drift sand
engineering characteristics
compaction standard
