砾石土料的湿化变形试验技术难点与解决方法  

Difficulties and solutions of wetting deformation test of gravelly soil core wall material

作　　者：左永振[1] 程展林[1] 潘家军[1] 周跃峰[1] 赵娜[1] ZUO Yong-zhen;CHENG Zhan-lin;PAN Jia-jun;ZHOU Yue-feng;ZHAO Na(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan,Hubei 430010,China)

机构地区：[1]长江水利委员会长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《岩土力学》2023年第7期2170-2176,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金联合基金重点项目(No.U21A20158,No.U1765203);国家自然科学基金面上项目(No.51979010);中央级公益性科研院所基本科研业务费项目(No.CKSF2021484/YT)。

摘　　要：砾石土心墙料的大尺寸样品湿化变形试验难度极大,这主要是砾石土料的性质决定了其饱和固结排水困难、样品难以达到饱和状态、试验周期太长。从试验技术、测试方法等方面进行攻关,分析试验成果出现偏差的原因并修正,针对砾石土湿化变形离散性大、存在应力饱和问题,进行了艰难地研究探索。通过对湿化试验过程中的体变修正、进水量修正、饱和度实时计算、成果离散性处理等关键细节的严格把控,最终成功地完成了典型砾石土料的湿化变形试验,获得了规律性较好的砾石土心墙料湿化变形成果。试验过程中出现的异于常规的现象,如围压施加过程中三轴压力室的整体向上变形、高应力状态下没有湿化变形量等,通过试验数据分析和理论分析,最终都得到了合理的解释,加深了对砾石土心墙料土工试验技术和砾石土料湿化变形的认识。The wetting deformation test on the large specimens of gravelly soil core wall material is a challenging task,because the physical properties of gravelly soil material lead to difficulties of saturation,consolidation and drainage for a specimen and a long test cycle.In this study,we tackled the above key issues from the aspects of test technology and test methods,analyzed and corrected the deviation of test results in previous research,and performed detailed exploration in the aspects of large discreteness of the wetting deformation of gravelly soil and the problem of stress saturation.Through strict control of key details such as volumetric deformation correction,water inflow correction,real-time saturation calculation and discrete processing of results in the process of wetting test,the wetting deformation test on the typical gravelly soil materials was successfully completed and reasonable wetting deformation results were obtained.Abnormal phenomena in the test,such as overall upward deformation of the triaxial pressure chamber during the application of confining pressure and no obvious wetting deformation under high stress,have been reasonably explained through data and theoretical analyses.The understanding of geotechnical test technology and wetting deformation of gravelly soil materials has been deepened.

关 键 词：砾石土心墙料 湿化变形 单线法 大三轴 试验技术 

分 类 号：TU411[建筑科学—岩土工程]