娄衡高速公路白垩系泥质粉砂岩不良工程特性  

Adverse engineering properties of Cretaceous argillaceous siltstone along Loudi to Hengyang expressway

作　　者：邹英[1] 陈露 吴启红[3] 陈安[1] Zou Ying CHEN Lu WU Qihong CHEN An(Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China School of Geoscience and Technology, SouthWest Petroleum University, Chengdu 610500, China School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]西南石油大学地球科学与技术学院,四川成都610500 [3]成都大学城乡建设学院,四川成都610106

出　　处：《湖南科技大学学报（自然科学版）》2016年第3期64-68,共5页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：湖南省博士后科研资助专项计划项目(2007138)

摘　　要：为了研究娄衡高速公路白垩系泥质粉砂岩不良工程特性,采用了岩矿分析、物理力学试验、软化试验、崩解试验和风化速度试验等研究手段对粉砂质泥岩试验展开研究.研究结果表明,白垩系泥质粉砂岩矿物成分主要是石英和粘土矿物;随风化程度增加,岩石粘土矿物成分含量增加,活动性强的氧化物含量降低,孔隙率增大,天然抗压强度降低,耐崩解性指数降低,软化系数降低,自由膨胀率增加;岩石最后一次循环风化剥落量是初次循环的近30倍.可见泥质粉砂岩为易软化、易崩解、水稳定性差、抗风化能力低的软质岩,同时风化作用进一步劣化了岩石的工程性质.To study the adverse engineering properties of Cretaceous argillaceous siltstone along LouDi to HengYang expressway, mineral analysis, physical and mechanical tests, softening test, disintegrability test, and weathering rate test are used. The test results show that the mineral composition of Cretaceous argillaceous siltstone is mainly quartz and clay minerals. The weathered degree of rock from lightly weathered to strongly weathered, the content of clay minerals is increased, the content of strong activity oxides is decreased, the porosity of rock is increased, the natural compressive strength is decreased, the slake disintegration index of rock is decreased, the softening coefficients of rock is decreased, the free swelling ratio of rock is increased. The rock weathered ablation amount of the last cycle is 30 times that of the first cycle. So the Cretaceous argillaceous sihstone is easy to soften, easy to disintegrate. Its water stability and Weathering resistance are poor so it is soft rock. At the same time, the weathering deteriorates the engineering orooerties of rock.

关 键 词：白垩系 粉砂质泥岩 不良工程特性 风化作用 劣化 

分 类 号：P642.2[天文地球—工程地质学]