摘要
土的结构性可以从本质上揭示土体的工程性质和行为本质。冻融循环对土体结构性有着非常重要的影响。在结构性定量参数"综合结构势"的基础上,增加考虑了冻融循环对土结构性的影响,提出了一个考虑冻融循环对土结构性的影响作用的结构性定量参数(简称冻融结构势)。并通过单轴压缩试验和单轴循环加卸载试验分别获得原状土、浸水饱和土及不同冻融循环次数下土样的单轴强度、失效应变、回弹模量和能量耗散,对用不同参数表示的冻融结构势进行了对比和分析。并利用CT扫描试验获得了不同冻融循环次数下土样中间截面的CT数均值,对冻融结构势进行了验证。认为不同参数表示的冻融结构势反映了土体结构性的不同方面,而用强度和能量耗散表示的冻融结构势能够较好地反映土结构性随冻融循环次数的变化情况,并提出在不同参数表示的冻融结构势之间的关系可能跟土质、加载方式等因素有关,明确了下一步的研究方向。
Thestructural characteristicsof soilscan essentially reveal the fundamentals of geotechnicalbehaviors. The freeze-thaw cycles have very important effect on them. Based on the quantitative structural parameter, comprehensive structural potential （CSP） proposed by Xie Dingyi, a modified structural parameter, a comprehensive structure potential with consideration of freeze-thaw cycles （CSPFT）, is proposed. The routine uniaxial compression and uniaxial loading-unloading compression tests are conducted to get the 4 indexes of uniaxial compression strength, failure strain, resilient modulus and energy dissipation, which are used to constitute the CSPFT. The differences between CSPFTs constituted from the 4 indexes are also discussed. CT scanning of soil samples under different cycles is conducted to analyze the reliability of CSPFT, and CSPFTs of strength and energy dissipation are better than those of the other two ones. The relationships between the CSPFTs of different parameters rely on the soil types, stress paths and other factors, which are worth for further discussion.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2016年第7期1339-1344,共6页
Chinese Journal of Geotechnical Engineering
基金
国家重点基础研究发展计划("973计划")项目(2012CB026106)
国家自然科学基金优秀国家重点实验室研究项目(41023003)
甘肃省科技重大专项计划项目(143GKDA007)
中科院西部之光重点项目
关键词
结构性
冻融循环
定量参数
structural characteristic
freeze-thaw cycles
quantitative parameter
