基于数字图像的土体剪切带细观结构试验研究  

Experimental Study on Mini-structure of Soil Shear Band Based on Digital Images

作　　者：方庆军[1] 王笃波[2] 洪宝宁[3] 

机构地区：[1]福建工程学院,福建福州350108 [2]华北水利水电大学,河南郑州450045 [3]河海大学岩土工程科学研究所,江苏南京210098

出　　处：《华北水利水电大学学报（自然科学版）》2014年第2期60-63,共4页Journal of North China University of Water Resources and Electric Power：Natural Science Edition

基　　金：国家自然科学基金(51079052);福建省高校科研启动基金(E0600140)

摘　　要：为了研究土体在连续荷载作用下,剪切带的萌生、演化过程中细观结构的变化情况,利用光学测试技术,获取试样观测面在荷载作用下连续变化的数字图像,并结合数字相关法,进行试样表面相对位移场的测量,以确定剪切带通过的区域,进而确定剪切带细观结构的观测区域.在指定的观测区域中,通过观测点区域相互交接的观测方法,进行剪切带内岩土体细观结构观测.通过多组水泥土单轴压缩细观结构观测试验,对所提出的观测方法的可靠性进行了论证.结果表明,只要设置好观测步长,通过上述方法即能采集到剪切带萌生、演化直至破坏的过程中各个阶段的细观结构图像.In order to research change rules of the mi^ni-structure in the process of soil shear band initiation and development under the continuous loads, the optical testing technology was used to collect continuous changing digital images of the sample observation sur- face, and the disp!acemegt field of the saml^le surface was measured with digital correlation method to determine the area passed by the shear band, and then determine the observation area of the mini-structure. In the specified observation area, the rock and soil mini- structure of shear band was observed by the mutual transfer method of observation areas. Then the reliability of the proposed observation method was verifieded by multi-sets of uniaxial compression tests on the soil cement mini-structure observation. The results showed that as tong as the observation step size was set properly, the mini-structure images in the process of initiation, evolution until destruction of ,the shear band were able to be captured by the above methods.

关 键 词：剪切带 细观结构 数字相关 试验 

分 类 号：TV16[水利工程] TU411.2[建筑科学—岩土工程]