外加剂对桂林含有机质水泥红黏土力学性质影响的试验研究  

LABORATORY TEST STUDY ON MECHANICAL PROPERTIES OF ADDITIVE TO ORGANIC CEMENT RED CLAY IN GUILIN REGION

作　　者：刘宝臣[1] 唐黔[1] 李懿[2] 李翠娟 

机构地区：[1]桂林理工大学土木与建筑工程学院,桂林541004 [2]中南大学地球科学与信息物理学院地质工程系,长沙410083 [3]重庆地勘局107地质队,重庆401120

出　　处：《工程地质学报》2013年第4期554-559,共6页Journal of Engineering Geology

基　　金：广西自然科学基金重点项目(2010GXNSFD013011)资助

摘　　要：红黏土是碳酸盐岩在湿热环境下经过风化作用形成的一种特殊性土,孔隙大、含水量高,而其结构性强且存在上硬下软的成层分布特征,上部为坚硬、硬塑状态,下部为软塑、流塑状态。水泥搅拌法因其有加固效果好、造价低、工期短、污染小等特点被广泛应用在处理软弱红黏土。近年来环境和工程地质条件不断恶化,造成大面积红黏土被有机质污染,严重影响地基的强度,但是研究表明合理使用外加剂可以改善被有机质污染红黏土的物理力学性质。本文从外加剂掺量和类型对抗剪强度、压缩系数、无侧限抗压强度等方面进行室内试验研究,得出外掺剂种类和掺量与它们之间的关系。结果表明:其间的相关性较好。Red clay is a special soil that is formed from the carbonate rocks by weathering under the hot and humid environment.Its pores are large and can have high water contents.It has the character of strong two layer structure. The upper layer clay has the rigid and hard plastic condition and high bearing capacity.The lower layer clay is soft plastic,has flowing plastic condition and weak bearing capacity.The soft red clay needs treatment.This paper uses the soil-cement mixing method to treat the soft red clay.With the variation of the environment and conditions continuously,the red clay is polluted in large areas.And,the existence of the organic matter affects the strength of the foundation.But the test results show that reasonable application of the additives can improve the properties of cement red clay that has been polluted by organic matter.The test results include shear strength,compression coefficient and unconfined compressive strength of cemented clays and take into account the quantity of additives.

关 键 词：有机质红黏土 压缩系数 强度 水泥搅拌法 外加剂 

分 类 号：TU472.5[建筑科学—结构工程]