湖南白垩系泥质粉砂岩风化特性研究  

Study on the weathering characteristics of Cretaceous argillaceous siltstone

作　　者：陈安[1,2] 彭振斌[2] 罗毅莎[3] 

机构地区：[1]湖南省交通规划勘察设计院,湖南长沙410008 [2]中南大学,湖南长沙410083 [3]长沙矿山研究院,湖南长沙410012

出　　处：《湖南科技大学学报（自然科学版）》2009年第1期58-61,共4页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：湖南省企业博士后专项基金资助项目(2007138)

摘　　要：为了研究白垩系泥质粉砂岩的风化特性,对不同风化程度的泥质粉砂岩岩体进行了工程特性、风化耐久性和风化速度试验.试验结果表明:随着岩体风化程度的加深,岩石中粘土矿物含量增加,增幅达52.7%;活动性强的化学成分相对减少,含量由7.58%降到1.98%;岩石干密度降低,由2.58g/cm3降为2.31g/cm3;孔隙率由3.8%增至17.3%;吸水率由1.96%增至2.76%,力学性能降低,抗压强度由5.2MPa降至1.8MPa,抗拉强度由2.24MPa降至0.27MPa;岩体更容易软化崩解.岩石的风化速率与自身的风化状态和暴露的面积有关.表9,参6.To study the weathering characteristics of Cretaceous argillaceous siltstone, the engineering characteristics test, the weathering durability test, the weathering speed test were done for the different weathering degree argillaceous sihstone. The test results show that when the weathering degree of the rock mass deepen, the content of clay minerals in the rock mass increases, the increase is 52.7%; the activity chemical composition in the rock mass decreases relatively, from 7.58% to 1.98%; the dry density of the argillaceous siltstone decreases from 2.58 g/cm^3 to 2.31 g/cm^3; the total porosity increases from 3.8 to 17.3 ; the water absorption increases from 1.96% to 2.76% ; the mechanical properties is weak, the compressive resistance decreases from 5.2 MPa to 1.8 MPa; the tensile strength decreases from 2.24 MPa to 0.27 MPa; the rock mass becomes soften and collapse easily. The weathering speed of the rock mass is relevant with the weathering degree and the exposed area of the rock mass.

关 键 词：白垩系 泥质粉砂岩 工程特性 风化耐久性 风化速度 

分 类 号：P642.24[天文地球—工程地质学]