多因素影响下压实大理石废粉的剪切特性  

Shear Characteristics of Compacted Marble Waste Powder under the Influence of Multiple Factors

作　　者：周佳翔 王勇 刘俊祺 周宏贵 ZHOU Jia-xiang;WANG Yong;LIU Jun-qi;ZHOU Hong-gui(Guilin University of Technology,Guilin 541004,China;Hezhou College,Hezhou 542800,China)

机构地区：[1]桂林理工大学土木工程学院,广西桂林541004 [2]贺州学院建筑与电气工程学院,广西贺州542800

出　　处：《金陵科技学院学报》2024年第1期54-62,共9页Journal of Jinling Institute of Technology

基　　金：国家自然科学基金地区项目(52268057);广西住房城乡建设科学技术计划项目(桂建函[2023]694号)。

摘　　要：为更详细地了解大理石废粉的剪切特性,通过击实试验将大理石废粉制备为不同含水率(14.6%、20%、23.8%)和不同击实功(2013.7、2684.9、3356.2 kJ·m^(-3))的试样,进行三轴固结不排水剪切试验,描述了大理石废粉抗剪强度的变化趋势与剪切过程中破坏形式的变化。结果表明:随着击实功的增大,大理石废粉的最大干密度变大,最优含水率降低。在14.6%含水率情况下,击实功由75%变为100%和125%时试样的极限偏应力分别增加了12.99%和57.94%。试样含水率越靠近最优含水率,极限偏应力越大。相比于最优含水率,干侧含水率情况下试样的极限偏应力减少了18.54%,湿侧含水率情况下极限偏应力减少了3.98%。在低围压条件下,试样的破坏形式为先剪缩后剪胀。改变含水率和击实功,都会在一定程度上影响大理石废粉原本的固结程度,导致其破坏形式变为持续剪缩。In order to understand the shear properties of marble waste powder in more detail,the marble waste powder was prepared as specimens with different moisture content(14.6%,20%,23.8%)and different compaction work(2013.7,2684.9,3356.2 kJ·m^(-3))through the percussion test to perform the triaxial consolidation undrained shear test.The results describe the trend of shear strength change of marble waste powder with the change of damage form in shear process.The test results show that the maximum dry density of the marble waste powder becomes larger and the optimum moisture content decreases with the increase of the compaction work.In the case of 14.6%moisture content with compaction work from 75%to 100%and 125%,the ultimate partial stress of the specimens increased by 12.99%and 57.94%.The ultimate partial stress of the specimens increases as the moisture content of the specimens gets closer to its optimum moisture content.Compared to the optimum moisture content,the ultimate partial stress decreased by 18.54%for the dry-side moisture content case and by 3.98%for the wet-side moisture content case.The damage of the specimens was in the form of shear shrinkage followed by shear expansion under low circumferential pressure conditions.Changing the moisture content and the compaction work will affect the original degree of consolidation of the marble waste powder to a certain extent,resulting in a change in the form of damage to sustained shear shrinkage.

关 键 词：大理石废粉 抗剪强度 含水率 击实功 破坏形式 

分 类 号：TU442[建筑科学—岩土工程]