Experimental study of compressibility of red clay affected by acid-base and soluble salt solutions
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摘要: 为探讨水环境对红黏土工程地质性质的影响，以桂林岩溶地区典型地段的红黏土为研究对象，对浸泡于不同浓度的HCl、NaOH、Fe(NO3)3和Al(NO3)3溶液中的试样进行固结实验。结果显示：(1)在HCl和NaOH溶液中浸泡后，红黏土的压缩模量都降低，压缩系数都增大，且溶液浓度越大其值降低或增大的幅度越大；(2)浸泡在NaOH溶液中的红黏土的压缩模量比浸泡在HCl溶液中的大，且压缩模量值随着溶液浓度的增加而减小，压缩系数则相反；(3)在Fe(NO3)3和Al(NO3)3溶液中浸泡后，红黏土的压缩模量会随着溶液浓度的增大而增大，压缩系数随着溶液浓度的增大而降低，且Fe(NO3)3溶液对红黏土的压缩性影响作用比Al(NO3)3溶液的大。Abstract: Guilin is located in the southwest of NE-SW trend Xiang-Gui lowland corridor with coordinates of longitude 110°17′and latitude 25°14′. It has a subtropical monsoon climate with abundant annual rainfall, and is hot, humid and rainy. Guilin is in the Lijiang River valley plain, which has well-developed karst and large areas of red clay. The engineering properties of red clay in Guilin are very complex, making the water stability poor. The chemical activity is closely related with the chemical composition of groundwater. To study the effects of the water environment on engineering geological properties, the red clay was taken from a typical karst area in Guilin. The samples were soaked in different concentration solutions of HCl, NaOH, Fe(NO3)3 and Al(NO3)3. Experimental results showed that:(1) The compression modulus of the red clay decreased and the compression coefficient increased when it was soaked in different concentration of HCl and NaOH solution, and that the greater the solution concentration was, the larger the decrease in range would be; (2) The compression modulus of the red clay was greater when the red clay was soaked in a solution of NaOH than that soaked in a solution of HCl, and the compression modulus value decreased with the increase of solution concentration, the opposite of the compression coefficient; (3) The compression modulus of the red clay increased and the compression coefficient decreased with the increase of solution concentration when the red clay was soaked in solutions of Fe(NO3)3 and Al(NO3)3,and the effect of the Fe(NO3)3 solution was greater than that of the Al(NO3)3 solution.
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[1] 姜洪涛.红黏土的成因及其对工程性质的影响［J］.水文地质工程地质,2000,(3):33-37. [2] Ola S A. Mineralogical properties of some Nigerian resiual Soil in relation with building problems［J］.Engineering Geology.1980,15(1-2):1-13. [3] Madu R M. An investigation into the geotechnical and engineering properties of some laterite of Eastern Nigeria［J］.Engineering Geology,1977,11(2) :101-125. [4] 王继庄.游离氧化铁对红粘土工程特性的影响［J］.岩土工程学报,1983,5(1):147-156. [5] 黄质宏,朱立军,蒲毅彬,等.三轴应力条件下红粘土力学特征动态变化的CT分析［J］.岩土力学,2004,(08):1216-1220. [6] Gidigaso M D. Mode of formation and geotechnical characteristics of laterite materials of ghana in relation to soil forming factors［J］.Engineering Geology,1997,6(2):79-150. [7] 薛守义，卞富宗. 红土的结构与工程特性［J］.岩土工程学报,1987,9(3):92-104. [8] 赵颖文,孔令伟,郭爱国,等.广西原状红粘土力学性状与水敏性特征［J］.岩土力学,2003,24(4):568-572. [9] 汤连生.水土化学作用的力学效应及机理分析［J］.中山大学学报(自然科学版), 2000, 39(4):104-108. [10] 朱寿增. 柳州市酸雨对土体物理力学性质的影响［J］.桂林工学院学报,1996,16(2)：143-149. [11] 孙重初. 酸液对红粘土物理力学性质的影响［J］.岩土工程学报,1989,11(4):89-93. [12] 顾季威. 酸碱废液侵蚀地基土对工程质量的影响［J］.岩土工程学报,1988,10(4):72-78. [13] Payne K, Pickering W F. Influence of clay-solute interactions on aqueous copper ion levels［J］.Water, Air and Soil Pollution,1975,5(1):63-90. [14] 王洋,汤连生,高全臣,等.水土作用模式对残积红粘土力学性质的影响分析［J］.中山大学学报, 2007,46(1):128-132. [15] Bishop A W, Bjerrum L. The relevance of the triaxial test to the solution of stability problems［C］. Research Conference on Shear Strength of Cohesive Soils, 1960,(34):437-501. [16] 唐益群,佘恬钰,张晓晖,等.贵州石漠化地区降雨条件下红粘土剪切强度特性随含水量变化关系探讨［J］.工程地质学报，2009,17（2）：249-252. [17] 韦复才. 桂林红土的工程地质性质及其主要工程地质问题［J］. 吉林大学学报(地球科学版),2005,35(6):775-780. [18] 韦复才.桂林红土的工程地质性质及其形成条件［J］.中国岩溶,1996,15(1-2):132-140. [19] 陈菊伟. 桂林附近第四纪堆积物特征［J］.中国岩溶,1990,9(1):52-59. [20] 庞春勇,赖来仁. 桂林市红粘土的矿物组成与化学组成特征［J］.矿产与地质,2001,15(6)：734-737. [21] 庞春勇，赖来仁，周明芳. 桂林市红粘土的化学活动性与工程环境效应［J］. 矿产与地质，2002,16(6):357-359. [22] 唐大雄,刘佑荣,张文殊,等.工程岩土学［M］.北京:地质出版社,1999:30,36. -
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