不同结构性黄土的单轴抗压试验及破坏模式  

Single Compression Experimental Analysis and Failure Mode of Loess with Different Structural

作　　者：罗爱忠[1,2] 邵生俊[2] 方娟[1] 陈昌禄[1] 

机构地区：[1]毕节学院土木建筑工程学院,贵州毕节551700 [2]西安理工大学岩土工程研究所,西安710048

出　　处：《土木建筑与环境工程》2014年第4期74-80,共7页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金(41272320);贵州省自然科学基金(黔科合J字LKB[2012]13号);贵州省教育厅自然科学重点项目(黔教合KY字[2013]179)

摘　　要：结合室内单轴压缩实验,对不同初始结构性黄土在单轴应力条件下的结构性变化特性进行研究。研究发现,在同一含水率条件下,原状黄土试样的单轴抗压强度要明显高于重塑黄土试样的单轴抗压强度;当含水率较低时,土样的破坏主要表现为脆性拉裂破坏,破坏呈现突然性;当初始含水率较低时,含水率对黄土结构亚稳定状态的影响减小,初始结构强度的损失也相对减小,结构的可变性相对较大,黄土在该状态条件下所具有的初始结构性较强。构度结构性参数指标随初始含水率的增大出现骤减,说明在这一阶段试样的初始含水率对黄土的初始结构性的影响较明显;当黄土的初始含水率达到一定值以后,含水率的增大使得黄土试样在沉积过程中初始结构性相比低含水率下沉积的黄土试样,土样的初始结构性已经部分减小,从而对构度结构性参数指标的影响相对较小。Based on the single compression experiments in laboratory, the structural change characteristic of loess with different initial structural in single compression stress conditions was studied. The conclusions are： compared to the single axial compression strength between intact loess and remold loess in the same moisture conditions, strength of intact loess was way bigger than remold loess; when the water content was low, all of a sudden, the destruction model of loess samples was mainly brittle tensile failure; when the water content was low, there was relative little effect on metastable of structural and was relative little loss of initial structural strength, and relative more variability; and then, there was way higher initial structural strength. The structural index decreased sharply with the moisture increase of intact loess, and the effect of water content on initial structural is obvious; when the water content reached a certain value, moisture effect on initial structural of intact loess become more and more unobvious, and structural index of loess was relative small. In other words, the initial structural has been fully released by remolding and saturating; the reasonability of structural index which was quantitative described the initial structural of loess was verified.

关 键 词：黄土 结构性 单轴抗压试验 构度 破坏模式 

分 类 号：TU444[建筑科学—岩土工程]