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为研究崩岗区重塑非饱和花岗岩残积土变形特性,利用双压力室非饱和土三轴仪做了重塑土的控制吸力固结排水剪切试验,研究了干密度、净围压和基质吸力对剪切破坏阶段的体积变形的影响,分析了重塑非饱和花岗岩残积土在控制吸力条件下剪切过程中的体变性状。试验结果表明,重塑非饱和花岗岩残积土的体变特性不仅取决于干密度和净围压,还与基质吸力密切相关,但净围压比基质吸力对土体体积应变的影响大。研究成果可为崩岗侵蚀区灾害防治及其体积变形、沉降量预测提供参考。
In order to study the deformation characteristics of remnant granite remnant soil in the collapse area, the controlled suction consolidation shear test of remolded soil was carried out by using the double pressure chamber unsaturated soil triaxial apparatus. The effects of dry density, net confining pressure and matrix Suction on the volume deformation in the shear failure stage, the body deformation of the remolded unsaturated granite residual soil under the control of suction was analyzed. The results show that the bulk deformation behavior of remodeled unsaturated granite residual soil depends not only on dry density and net confining pressure, but also on matrix suction. However, the effect of net confining pressure on substrate volumetric strain is greater than that of substrate suction. The research results can provide reference for the prevention and control of disasters and their volume deformation and settlement in the collapse area.