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考虑碱液浓度、迁入时间两个因素,通过浸泡试验方法,研究碱液迁入条件下碱污染红土的剪切、压缩等工程特性,分析碱液迁入与红土间的相互作用。试验结果表明:碱液浓度较低时,碱污染红土的抗剪强度、黏聚力、内摩擦角、压缩模量减小,低于素红土;碱液浓度较高时,碱污染红土的抗剪强度、黏聚力、内摩擦角、压缩模量增大,高于素红土;随碱液浓度增大,碱污染红土的抗剪强度、黏聚力、内摩擦角、压缩模量逐渐增大。随迁入时间延长,低浓度下,碱污染红土的抗剪强度、黏聚力、内摩擦角、压缩模量缓慢减小,存在极小值;高浓度下,碱污染红土的抗剪强度、黏聚力、内摩擦角、压缩模量明显增大,存在极大值。碱液迁入引起红土工程特性变化的实质在于迁入过程中碱液与红土间的相互作用,可以分为初期、中期、后期三个阶段来解释。
Considering the concentration of alkali solution and the time of migration, the engineering characteristics of alkali-contaminated laterite such as shearing and compression were studied by soaking test method. The interaction between alkali liquor and red clay was analyzed. The test results show that when the alkali concentration is low, the shear strength, cohesion force, internal friction angle and compressive modulus of alkali-contaminated laterite are reduced, which is lower than that of plain laterite; when alkali concentration is high, the resistance of alkali-contaminated laterite is high. Shear strength, cohesion, internal friction angle and compressive modulus increase higher than that of plain laterite. With the increase of alkali concentration, the shear strength, cohesion, internal friction angle and compression modulus of alkali-contaminated laterite increase gradually. Big. With the prolonged residence time, at low concentrations, the shear strength, cohesion, internal friction angle and compressive modulus of alkali-contaminated red clay slowly decrease with minimal values; at high concentrations, the shear strength of alkali-contaminated red clay, The cohesion force, internal friction angle, and compressive modulus increase significantly and have maximum values. The essence of the change of engineering properties of red clay caused by the alkali liquor migration is the interaction between alkali liquor and red clay in the process of moving in. It can be divided into three stages: initial stage, middle stage, and late stage.