透明土强度特性及模拟黏性土的可行性试验

Strength Property and Feasibility Test of Transparent Soil to Model Clayey Soil

摘要:

采用体积比为2.5∶1的15号白矿油和正十二烷混合液与无定形硅石粉末配制成透明土以模拟黏性土.进行了120个不同应力状态透明土样的直剪固快强度试验及常规固结压缩试验，给出了透明土在不同应力状态下的抗剪强度值，并与典型黏性土进行了对比分析，得知两者在强度及压缩特性上具有高度相似性；通过等沉降速率的室内压板载荷试验，得到了荷载沉降曲线、土体极限承载力、土体速度场、土体位移场，与既有研究结果进行了对比，验证了透明土模拟黏性土应用于模型试验的可行性.

Abstract:

The transparent soil was developed to model clayey soil, which was composed by amorphous silica powder, white mineral oil and dodecane mixture (2.5∶1 by volume). Based on the consolidated quick direct shear tests of 120 transparent soil samples with different stress states and normal consolidated compression tests, the shear strength under different stress states was given, also the strength and deformation properties were studied and showed high similarity to clayey soil. The loadingsettlement curves, ultimate bearing capacity, and velocity field displacement field were obtained by plate loading tests with the same settlement rates. The feasibility of using transparent soil to model clayey soil was finally verified by comparing with some known results.