生物酶改良膨胀土的修正殷宗泽模型  

Modified Yin’s double-yield-surface model for bioenzyme-treated expansive soil

作　　者：陈永青 文畅平 方炫强 CHEN Yong-qing;WEN Chang-ping;FANG Xuan-qiang(School of Civil Engineering,Central South University of Forestry and Technology,Changsha,Hunan 410018,China;Zhonglu Gaoke Traffic Inspection and Certification Co.,Ltd.,Beijing 100088,China)

机构地区：[1]中南林业科技大学土木工程学院,湖南长沙410018 [2]中路高科交通检测检验认证有限公司,北京100088

出　　处：《岩土力学》2019年第9期3515-3523,共9页Rock and Soil Mechanics

基　　金：国家国际科技合作专项（No.2014dfa53120）;现代木结构工程材制造及应用技术湖南省工程实验室开放基金资助项目（No.HELFMTS1707）;湖南省重点学科建设项目（No.2013ZDXK006）~~

摘　　要：以描述生物酶改良膨胀土的应力-应变关系为研究目的,提出基于生物酶掺量的修正殷宗泽模型。开展了一系列三轴排水剪切试验。对不同生物酶掺量下改良膨胀土的弹性形变演化规律进行了分析,同时研究了生物酶掺量与剪切压缩、剪切膨胀相关的屈服面形状的演化规律,以及与破坏线方程的演化规律。在此基础上分析了生物酶掺量对殷宗泽模型的参数影响规律。引入生物酶掺量作为修正殷宗泽模型的修正因子,最终对殷宗泽模型进行了修正。研究结果表明:生物酶能有效地提高改良膨胀土的力学性能,修正殷宗泽模型能够很好地描述生物酶改良膨胀土的土体本构关系。对比修正殷宗泽模型的理论计算值与试验值,两者具有很高的吻合度,且修正殷宗泽模型的参数确定方法与殷宗泽模型参数确定方法相同。The purpose of this study is to establish a modified Yin’s double-yield-surface model based on the ratio of bioenzyme-based soil stabiliser, which can accurately describe the physical and mechanical properties of the bioenzyme-treated expansive soil. A series of drained triaxial shear tests was carried out to study the evolution laws of stress-strain, the elastic deformation, yield surface shape, dilatant yield surface, and failure line equation relating to the content of bioenzyme. Moreover, the effect of the bioenzyme content on the parameters of the Yin’s model was analysed. Finally, the bioenzyme content was introduced as a correction factor for the modified Yin’s double yield surfaces model. The results show that the bioenzyme can effectively improve the mechanical properties of the treated expansive soil. The modified Yin’s double-yield-surface model can well describe the constitutive relation of the bioenzyme-treated expansive soil. The theoretical calculation results of the modified Yin’s model show good agreement with the experimental results. Besides, the parameter determination method of the modified model is consistent with Yin’s original model.

关 键 词：公路工程 膨胀土 本构关系 修正殷宗泽模型 双屈服面 演化规律 三轴试验 

分 类 号：TU411[建筑科学—岩土工程]