预崩解炭质泥岩路用性能及其基于三轴CT试验的力学特性  

Road performance of preliminary disintegration of carbon mudstone and mechanical characteristics based on CT-Triaxial test

作　　者：曾铃[1,2] 史振宁[3] 付宏渊[2,4] 何忠明[3] 胡庆国[3] 

机构地区：[1]长沙理工大学桥梁工程安全控制技术与装备湖南省工程技术研究中心,湖南长沙410114 [2]长沙理工大学土木与建筑工程学院,湖南长沙410114 [3]长沙理工大学交通运输工程学院,湖南长沙410114 [4]现代公路交通基础设施先进建养技术湖南省协同创新中心,湖南长沙410114

出　　处：《中南大学学报（自然科学版）》2016年第6期2030-2036,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51278067,51508040,51508042,51508079);湖南省教育厅科学研究重点项目(14A007);长沙理工大学桥梁工程安全控制技术与装备湖南省工程技术研究中心开放基金资助项目(14KC04)~~

摘　　要：为研究预崩解炭质泥岩的路用性能及其在三轴应力条件下的力学特征,利用室内基本物理力学实验与三轴CT同步扫描实验对其进行试验研究。研究结果表明:炭质泥岩矿物组成主要为伊利石、石英、高岭石,压实度是控制回弹模量的主要因素,具有与土相似的性质,不同工点所取试样具有不同的CBR;试件压实度越高,峰值强度越大,偏应力陡增段CT扫描层CT数增大速率比应力应变曲线平缓段的大,表明试验前期试件密度增大速率比试验后期的大;试验前,试件具有较多细小孔洞及裂纹,密度存在较大差异,随着试验的进行,密度差异性降低,炭质泥岩颗粒在围压及偏应力的作用下存在挤密、错动、融合的现象。In order to study the road performance of preliminary disintegration of carbon mudstone and its mechanical characteristics under triaxial stress condition, the indoor basic physical and mechanical test and triaxial computerized tomography were carried out with synchronous scanning test. The results show that the mineral composition of carbon mudstone mainly contains illite, quartz and kaolinite, and CBR is the main factor of controlling the resilient modulus,with the similar properties to earth, the CBR is different at different work sites. Peak strength increases with the increase of compaction degree, and the increase rate of CT number with CT scanning layer in spurt stage of deviatoric stress is greater than that of the smooth stage of stress-strain curve, which reveals the increase rate of test sample density in the early stage is greater than that in the later stage. Before the test, the density of test sample with many fine holes and cracks differs obviously, and the density difference reduces, and carbon mudstone particles have compacting, dislocation and fusion phenomenon under the action of confining pressure and deviatoric stress.

关 键 词：预崩解 炭质泥岩 路用性能 三轴CT试验 

分 类 号：TU457[建筑科学—岩土工程]