不同温度及围压作用下冻土三轴应力应变关系研究
邓楚涵¹ 钟帅¹ 王瑞坤^{1通讯作者} 冯双喜¹ 刘永超²

1 天津大学，天津市，300354；

2 天津建城基业集团有限公司，天津市，300301；

摘要：高寒地区冻土强度较高，常导致等厚度水泥土地下连续墙施工过程中出现埋钻卡钻、刀具磨损等问题，因此，亟需对冻土的力学特性进行深入研究。本文结合室内温控三轴试验与离散元模拟，揭示了不同温度及围压作用下冻土的应力应变关系和宏细观破坏特征。研究结果表明：冻土刚度及峰值偏应力随围压增大而增大。0℃时，较小围压条件下冻土呈轻微应变软化特征，而较高围压下冻土因压融效应，孔隙冰转化为孔隙水，导致冰-砂颗粒间的咬合作用减弱，冻土主要通过克服颗粒间的摩擦作用发生破坏，整体呈剪缩趋势，表现为应变硬化特征。-15℃时，冻土首先发生孔隙冰脆性断裂，随后孔隙冰-砂重组咬合作用失效，表现为双峰破坏与应变软化特征。上述研究成果可为高寒地区地下连续墙的设计和施工提供可靠的理论基础。

关键词：冻土；应力应变关系；颗粒摩擦；咬合作用；压融效应

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