排土场堆石料单线法湿化变形试验研究  

EXPERIMENTAL STUDY ON WETTING DEFORMATION OF THE SINGLE-LINE METHOD OF ROCKFILL MATERIALS IN WASTE DUMP

作　　者：沈兴刚 杜俊 李晨晨 SHEN Xing-gang;DU Jun;LI Chen-chen(Construction Engineering College,Kunming University,Kunming 650214,China)

机构地区：[1]昆明学院建筑工程学院,昆明650214

出　　处：《地质灾害与环境保护》2023年第3期79-84,共6页Journal of Geological Hazards and Environment Preservation

基　　金：云南省地方本科高校基础研究联合专项资金项目(202001BA070001-137);昆明学院人才引进项目(XJ20220015)。

摘　　要：为分析降雨入渗条件下排土场堆石料浸水湿化变形特性,采用粗粒土压缩试验机对排土物料开展单线法浸水湿化试验,研究堆石料在不同应力水平条件下的湿化变形特征,揭示其湿化变形发生机制,建立堆石料湿化蠕变模型。结果表明:排土场堆石料浸水湿化变形显著且不可忽略,随竖向压应力的不断增加,湿化变形量也显著增大。结合堆石料湿化变形速率发展特征,可将湿化变形分为瞬时变形和流变变形两部分,且流变变形大于瞬时变形。基于堆石料湿化变形时程曲线,建立了堆石料四参数双曲线型湿化蠕变模型,模型计算结果较为准确,能够客观反映排土场堆石料浸水湿化变形发展规律。To analyze the wetting deformation characteristics of dumped rockfill materials under rainfall infiltration conditions,we utilized a coarse-grained soil compression testing machine to conduct single-line wetting experiments on the dumped materials.This study aimed to understand the wetting deformation traits of the rockfill at different stress levels,elucidate the underlying mechanism of this deformation,and establish a wetting creep model for rockfill.Our findings indicate significant and non-negligible wetting deformation in the dump's rockfill.As vertical compressive stress increases,the amount of wetting deformation also rises markedly.Taking into account the progression characteristics of rockfill wetting deformation rate,wetting deformation can be bifurcated into instantaneous and rheological deformations,with the latter surpassing the former.Drawing from the time-course curve of rockfill wetting deformation,we constructed a four-parameter hyperbolic wetting creep model for rockfill.The model's calculations are precise,providing an objective representation of the evolution pattern of rockfill wetting deformation in the dumping area.

关 键 词：排土场 堆石料 压缩试验 湿化变形 蠕变模型 

分 类 号：TU411.5[建筑科学—岩土工程]