水土作用模式对残积红粘土力学性质的影响分析  

Effects of Water-Soil Interaction on Mechanical Strength of Residual Red Clay

作　　者：王洋[1] 汤连生[2] 高全臣[1] 廖化荣[2] 

机构地区：[1]中国矿业大学力学与建筑工程学院,北京100083 [2]中山大学地球科学系,广东广州510275

出　　处：《中山大学学报（自然科学版）》2007年第1期128-132,共5页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目(50279056);广东省自然科学基金资助项目(031601);广东省科技计划重点基金资助项目(2003C33301;2004B320801002)

摘　　要：研究了残积红粘土特殊的物理化学性质及结构特征,通过试验分析了在含水量变化模式、水化学作用模式、干湿交替作用模式和渗流作用模式下红粘土力学性质的变异性,得出以下结论:①含水量的变化对红粘土的粘聚力(c)和内摩擦角(φ)值都有影响,且对c值的影响远大于对φ值的影响;②红粘土的力学性质随着周围环境的变化而发生变异,其c、φ值和pH值呈良好线性关系,酸性水溶液使红粘土强度提高,碱性水溶液使红粘土的强度降低;③在干湿交替作用下,红粘土的结构性得到一定程度的破坏,主要受围压及侧向应力的影响;④渗流作用可以影响土体强度,红粘土在干湿交替作用后出现了裂缝,裂缝的发育增强了渗流作用对土体强度的影响程度。The physical and chemical properties and structural features are studied based on analytical data of residual red clay. The analysis on the variability of mechanical properties was made by simulative test in lab under different models of water-soil interaction including variety of moisture content, chemical reaction of water on soil, dry-wet alternate action and seepage action. The study draws the following conclusions： ①Changes in moisture content affect the values of c, φ, and the effect on the values of c was greater than that on the value of φ; ②Mechanical properties of red clay vary in different environments. The linear relationship between the values of c,φ and the value of pH has been observed. Acid water solution enhances the strength of the red clay, but alkaline water solution depresses it; ③The structure of red clay is damaged to a certain degree by surrounding press and lateral stress under the dry-wet alternate action; ④Seepage action can influence the intensity of soil, and the development of cracks that come forth under the dry-wet alternate action reinforces force of seepage action.

关 键 词：水土作用模式 残积红粘土 力学性质 试验研究 

分 类 号：TU411[建筑科学—岩土工程]