为了研究石灰-木质素改良黏土的动变形特性,对不同固结围压、石灰-木质素掺量的改良黏土开展共振柱试验,分析动剪切模量的发展规律,结果表明:随着围压的增加,石灰-木质素改良土的最大动剪切模量以及动剪切模量比提高；4%石灰+4%木质素改良黏土的最大动剪切模量以及动剪切模量比最高,在300kPa围压下,4%石灰+4%木质素改良土的最大动剪切模量相比8%石灰改良土提高17.3%,相比纯土提高185.4%；基于抗剪强度参数提出了改良土的相对结构度计算方法,4%石灰+4%木质素改良土的相对结构度最大；在Hardin公式基础上,引入相对结构度建立了改良土最大剪切模量的表征模型,该模型具有较好的准确性,可为评价石灰-木质素改良黏土的剪切模量特性提供理论依据。

In order to study the dynamic deformation characteristics of clay stabilized by lime-lignin, a set of resonant column test was carried out on the stabilized clay with different confining pressures and lime-lignin contents, and the development law of dynamic shear modulus was analyzed. The results show that the maximum dynamic shear modulus and dynamic shear modulus ratio of clay stabilized by lime-lignin increase with the increasing of confining pressure. The maximum dynamic shear modulus and dynamic shear modulus ratio of 4%lime +4%lignin stabilized clay are the highest. Under a confining pressure of 300kPa, the maximum dynamic shear modulus of 4% lime+4% lignin stabilized clay is 17.3% higher than that of 8% lime stabilized clay and 185.4% higher than that of pure clay. Based on the shear strength parameters, the relative structure of stabilized clay was calculated and the relative structure of 4%lime +4%lignin stabilized clay is the highest. On the basis of Hardin formula, a characterization model of maximum shear modulus was established by introducing relative structural. The model has good accuracy and can provide a theoretical basis for evaluating the shear modulus characteristics of clay stabilized by lime-lignin.

南京市交通运输科技项目(2022)