西韩城际铁路路基水泥改良黄土疲劳特性及影响因素

以西韩(富平—韩城)城际铁路为研究背景,采用静压法制备圆柱体水泥改良黄土试件,通过劈裂疲劳试验研究水泥掺量、压实系数对水泥改良黄土疲劳特性的影响规律,基于Weibull分布建立了不同失效概率下水泥改良黄土的疲劳寿命方程,并对设计年限内水泥改良黄土疲劳寿命进行预估.结果表明:水泥改良黄土疲劳寿命服从双参数Weibull分...

Fatigue Characteristic and Influencing Factor of Cement-improved Loess on Subgrade of Fuping-Hancheng Intercity Railway

Taking the Xihan(Fuping-Hancheng)Intercity Railway as the research background,the cylinder cement-improved loess specimen was prepared by static pressure method.The influence regulation of cement content and compaction coefficient on the fatigue characteristic of cement-improved loess was studied through splitting fatigue test.Based on Weibull distribution,the fatigue life equation of cement-improved loess with different failure probability was established,and the fatigue life of cement-improved loess in the design life was estimated.The results show that the fatigue life of cement-improved loess follows the two-parameter Weibull distribution.The fatigue equation can accurately predict the fatigue life of cement-improved loess,and its correlation coefficient R2is greater than 0.92.When only train load is considered,the fatigue failure of cement-improved loess is not easy to occur in the design life.Under the same load,there is a highly linear positive correlation between cement content and logarithmic fatigue life.The fatigue life of cement-improved loess can be increased by at least 10;times when the cement content increases by 1%.The fatigue life of cement-improved loess can be increased by at least 10;times when the compaction coefficient is increased by 0.01.Excessive compaction coefficient will limit the improvement of fatigue life by increasing cement content.