砾石含量对成都粘土力学特性的影响

通过三轴剪切试验,研究分析含砾成都粘土的力学特性。主要进行成都粘土与砾石不同配比的混合土三轴剪切试验,按照砾石含量的质量百分数进行分组。进行了四种围压(50kPa、100kPa、200kPa和400kPa)作用时的固结排水与固结不排水试验,并得出如下结论:①低围压时(σ1-σ3)随砾石含量的增加而提高;高围压时,20%试样(σ1-σ3)最低,依次是0%试样、40%试样;②随砾石含量的增加,割线刚度有所提高;③CD试验中,试样未出现体胀现象,40%试样体缩量较小;CU试验中,未出现孔隙水压力减小趋势,40%试样孔隙水压力值较高。

Influence of Content of Gravels on the Mechanical Properties of Chengdu Clays

Based on the triaxial shear test,the mechanical properties of pebbly Chengdu clay is investigated and analyzed.Chengdu clays and gravels are mixed with different proportions with the percentage of the mass of the gravels.The experiments are performed with four kinds of confining pressure of 50kPa,100kPa,200kPa and 400kPa respectively under drained and undrained conditions,from which the conclusions can be drawn as follows：①Under low confining pressure（σ1-σ3）has increased with increasing of the content of gravel;and under higher confining（σ1-σ3）of the 20% sample is the minimum,followed by 0% sample and 40% sample;②the secant modulus increases with the increase of content of the gravel;and ③the behavior of dilatability do not appear in the CD tests;the pore water pressure do not decrease in the CU tests.