论文部分内容阅读
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。
The structural nature of soil can essentially reveal the engineering nature and behavior essence of soil. The freeze-thaw cycle has a very important influence on the soil structure. On the basis of the structural quantitative parameter “comprehensive structure potential ”, the influence of the freeze-thaw cycle on the soil structure is added, and a structural quantitative parameter considering the effect of the freeze-thaw cycle on the soil structure is proposed Freeze-thaw structure potential). Uniaxial compressive tests and uniaxial cyclic loading and unloading tests were carried out to obtain uniaxial strength, failure strain, springback modulus and energy dissipation of undisturbed soil, saturated saturated soils, and soil samples under different freeze-thaw cycles respectively. The parameters representing the freeze-thaw structure potential were compared and analyzed. The average CT numbers of the middle section of the soil sample under different freeze-thaw cycles were obtained by CT scanning test, and the freeze-thaw structure potential was verified. It is considered that the different freezing-thawing potentials expressed by different parameters reflect different aspects of soil structure, while the freezing-thawing potentials expressed by intensity and energy dissipation can well reflect the change of soil structure with the number of freezing-thawing cycles It is suggested that the relationship between the freezing and thawing structure potentials expressed by different parameters may be related to soil quality, loading methods and other factors, and the research direction of the next step is clarified.