水泥/玄武岩纤维复合固化剂分别对泥炭质土静力特性的影响

Effects of Cement/Basalt Fiber Composite Curing Agents on Static Characteristics of Peat Soil

为了研究单掺水泥及复合固化剂(由水泥、生玄武岩纤维、石灰和生石膏组成)对滇池地区高原湖相泥炭质土静力特性的影响,对不同掺量水平下的水泥改良土和复合固化剂改良土进行静三轴不固结不排水剪切试验,研究了两种改良土的三轴应力应变关系与抗剪强度变化规律。研究表明:随掺量的增加,两种改良土的主应力差峰值强度增大;当掺入复合固化剂的质量分数为15%时,相比5%、10%两个掺量水平,复合固化剂改良土的三轴应力应变关系由“应变硬化型”转变为“应变软化型”,且抗剪强度显著提升;当改良土的内部结构发生破坏时,水泥改良土的抗剪强度有较大损失,而复合固化剂改良土仍保持较高的抗剪强度。

In order to study the effect of single-doped cement and composite curing agent(composed of cement,raw basalt fiber,lime and raw plaster)on the static characteristics of plateau lacustrine peat soil in the Dianchi Lake area,a static triaxial non-consolidation and non-drainage shear test was carried out on cement improved soil and composite curing agent improved soil at different dosage levels,and the triaxial stress strain relationship and shear strength change law of the two improved soils were studied.The results show that with the increase of the dosage,the peak strength of the main stress difference between the two improved soils increases.When the mass fraction of the composite curing agent is 15%,compared with the two doping levels of 5%and 10%,the triaxial stress-strain relationship of the compound curing agent modified soil is changed from“strain hardening type”to“strain softening type”,and the shear strength is significantly improved.When the internal structure of the improved soil is damaged,the shear strength of the cement improved soil has a large loss,while the composite curing agent improved soil still maintains a high shear strength.