高含水区改性土压剪特性试验研究

Experimental study on compression shear characteristics of modified soil in high water bearing area

为改善高含水区土体的压剪特性,分别采用水泥、石灰为胶凝材料改性高含水区原位土,通过试验方法研究高含水区域改性土养护龄期、改性胶凝材料与干土的质量比、土体压实度、水与干土和胶凝材料的质量比、围压强度等因素对改性土无侧限抗压强度和抗剪强度的影响,获得改性土早期压剪性能随不同影响因素的变化规律,建立抗剪强度随压实度和围压强度变化的回归模型。结果表明:胶凝材料与干土的质量比是影响水泥改性土抗压抗剪强度、石灰改性土抗剪强度的最大因素;压实度是影响石灰改性土抗压强度的最大因素,可通过调整改性土胶凝材料与干土的质量比改善土体的抗压、抗剪特性。

In order to improve the compression and shear properties of soil in high water bearing area,cement and lime are respectively used as cementitious materials to modify the in-situ soil in high water cut area.The effects of curing age,mass fraction of modified cementitious body to dry ground,soil compactness,mass fraction of water and confining pressure of modified soil in high water bearing area on the unconfined compressive strength and shear strength of modified soil are studied by experimental method.The variation law of early compression and shear properties of modified soil with different influencing factors is obtained.The regression model of shear strength with compactness and confining pressure strength is established.The results show that the mass fraction of modified cementitious materials to dry ground is the biggest factor affecting the compressive and shear strength of cement modified soil and lime modified soil.The degree of compaction is the biggest factor affecting the compressive strength of lime modified soil.The compressive and shear properties of the drawing can be improved by adjusting the mass fraction of modified soil cementitious material to dry soil.