海口软土中细砂复合效应试验研究

A Series of Tests Study on Compound Soil Incorporation of Medium-fine Sands in Haikou

针对海口软土掺中细砂形成复合土的复合效应进行系列试验研究。研究三轴试验中在不同围压下,不同配合比的复合土与原状软土的强度、应力应变关系、压缩性、渗透特性和有效应力路径特性。同围压下,随着中细砂掺量增加,复合土的抗剪强度越高,剪胀现象越明显。低围压下,复合土表现出一定的应变软化;而在高围压下,无论是复合土还是原状土都表现为应变硬化现象,其有效应力路径随着砂掺入量的增加由斜线或弧形向"S"形过渡。复合土渗透系数随着孔隙比的增大而减少。

A series of tests on compound soil based on soft soil which mixed medium-fine sands in Haikou.The strength,relationship between stress and strain,compressibility infiltration characteristics and the effective stress path properties of compound soil with different mix proportion and undisturbed soft soil in the condition of different confining pressure were studied.With the more of medium-fine sands in the soft soil,the greater of shear strength,and the more obvious the dilatancy;and compound soil presented strain softening in the process of shearing under low confining pressure,but all of the kinds of soils have strain hardening phenomenon under higher confining pressure;the form of the effective stress path of compound soil converts from oblique line or are to s-shape gradually with the increase of medium-fine sands in compound soil.