膨胀岩土挡墙侧向膨胀压力分析及参数取值研究  

Study on Parameter Selection and Analysis of Lateral Expansion Pressure of Expansive Rock Soil Retaining Wall

作　　者：赵云川 ZHAO Yun-chuan(Sichuan Electric Power Design Consulting Co.,Ltd,Chengdu 610041,China)

机构地区：[1]四川电力设计咨询有限责任公司,四川成都610041

出　　处：《云南水力发电》2020年第2期87-90,共4页Yunnan Water Power

摘　　要：通过相关文献研究成果,分析论证了膨胀土的膨胀压力为超固结压力与膨胀矿物颗粒吸水导致的膨胀压力,根据土水特征曲线,超固结压力在干湿循环作用下,出现衰减,并出现稳定的压力值,水平膨胀压力与垂直膨胀压力主要受应力历史、岩土内颗粒排列结构的影响,有一定的差异,挡墙设计应考虑的最大水平膨胀力,应考虑土壤含水率的可变区域对膨胀力的影响;挡墙侧的含水率分布应考虑极端不利情况,考虑膨胀岩土挡墙侧的土压力区间分布,建议在无试验依据的情况下,按照被动土压力设计挡墙;通过以上分析研究结果,提出了水平膨胀压力的试验测试方案和取值建议,为膨胀土挡墙设计提供参数依据。Based on the research results of related literature,it is analyzed and proved that the expansion pressure of expansive soil is caused by over consolidation pressure and water absorption of expansive mineral particles.According to the soil water characteristic curve,the overconsolidation pressure appears attenuation and stable pressure value under the action of dry wet cycle.The horizontal and vertical expansion pressure are mainly affected by stress history and particle arrangement structure in the rock and soil.The design of retaining wall should consider the influence of variable area of soil moisture content on expansion force.The water content distribution of the retaining wall side should consider the earth pressure interval distribution of the expansive rock soil retaining wall side.It is suggested that the retaining wall should be designed according to the passive earth pressure without the test basis.Based on the above analysis and research results,the test scheme of horizontal expansion pressure and the suggestion of value selection are proposed,which provide the parameter basis for the design of expansive soil retaining wall.

关 键 词：膨胀岩土 膨胀力 挡墙 土水特征曲线 

分 类 号：TU443[建筑科学—岩土工程]