青藏冻结粉土与玻璃钢接触面本构模型研究  

Study of the constitutive model of interface between frozen Qinghai-Tibetan silt and reinforced plastic fiberglass

作　　者：陈良致 温智[1] 董盛时 俞祁浩[1] 薛珂[1] 张明礼[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000 [2]南京大学地球科学与工程学院,江苏南京210046

出　　处：《冰川冻土》2016年第2期402-408,共7页Journal of Glaciology and Geocryology

基　　金：国家重点基础研究发展计划项目(2012CB026101);国家自然科学基金项目(41471061);冻土工程国家重点实验室自主课题(SKLFSE-ZY-12;SKLFSE-ZT-16);中国科学院寒区旱区环境与工程研究所STS项目(HHS-TSS-STS-1502)资助

摘　　要：冻土与构筑物基础接触面的本构模型是分析冻土区构筑物与冻土相互作用、评价工程安全稳定性的基础和关键.为了降低切向冻胀力对基础的上拔作用,防止发生冻拔失稳破坏,青海-西藏±400 k V直流联网工程基础广泛采用玻璃钢覆盖基础表面,以消减冻胀力.为了合理描述玻璃钢与冻土接触面力学特性,采用应变直剪仪开展了青藏冻结粉土与玻璃钢基础接触面直剪试验,获取了不同冻结温度条件下接触面剪应力-位移曲线,分析总结了接触面的强度变化规律和受力变形特性,基于试验得到的接触面本构规律建立了耦合温度效应的冻结粉土与玻璃钢基础接触面剪切应力-位移关系.模型预测结果与试验结果的比较表明,预测结果与试验结果吻合良好,该模型能够较好的描述接触面的力学特性.The mechanical properties of interface between frozen soil and structure are very important for ana-lyzing the interaction between structures and frozen soil and for evaluating the safety and stability of engineering structure. To prevent the frost heave damage,glass fiber reinforced plastics was put forward and applied to the foundation engineering of Qinghai-Tibetan electric transmission line. To describe the fundamental behaviors of frozen soil-structure interface reasonably,a series of laboratory direct shear tests of the interface between frozen silt and glass fiber reinforced plastic plate were performed. Based on the stress and shear displacement relation of the interface and the analysis of the interface strength and deformation characteristics,a stress-displacement-tem-perature constitutive equation of the interface has been established. Comparing the predicted result and the test re-sult shows that the predicted result is in good agreement with the test result. Namely,the constitutive model is validated to reasonably describe the mechanical properties of the interface.

关 键 词：接触面 直剪试验 本构模型 青藏冻结粉土 玻璃钢 

分 类 号：TU443[建筑科学—岩土工程] P642.14[建筑科学—土工工程]