扁铲侧胀试验测定静止侧压力系数的探讨  

Discussion on the Determination of Static Lateral Pressure Coefficient from Flat Dilatometer Tests

作　　者：储团结[1] 

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道工程学报》2015年第11期1-4,共4页Journal of Railway Engineering Society

摘　　要：研究目的:目前利用扁铲侧胀试验确定土层静止侧压力系数方法主要包括基于Mindlin解与弹性理论推导的理论公式法和基于试验数据建立的经验公式法。通过本次研究,拟确定上述两种方法中哪一种方法计算的土层静止侧压力系数更加准确,以利于在今后工程勘察中应用。研究结论:(1)基于Mindlin解和弹性理论推导的理论公式是线性的,其结果随角点应力与中心点应力的比值不同而不同,不易确定;(2)基于试验数据建立的经验关系式是非线性的,符合土体是非弹性体的特性,而且不同地区、不同成因的土层存在差异性,因此基于试验数据建立的经验关系式更适合工程实际;(3)本研究成果可供铁路、地铁、公路等工程勘察中获取土层静止土压力系数借鉴参考。Research purposes： At present, there are two main methods of determining the static lateral pressure coefficient from the fiat dilatometer tests which are the theoretical formula method based on the Mindlin solution and elasticity theory and the experience formula method based on the test data of the flat dilatometer tests. Through this research, which of the two methods is more accurate for calculating the static lateral pressure coefficient of the soil layer is determined, and the method can be applied to the engineering exploration in the future. Research conclusions： （ 1 ） The theoretical formula method based on the Mindlin solution and elasticity theory is linear, and the result is difficult to determine because it changes with the change of the ratio of the corner point stress and the center point stress. （2） The experience formula method based on the test data of the flat dilatometer tests is nonlinear, which is in line with the characteristics that soil is non -elastomeric, and the soil layers from the different regions and different genesis. So the experience formula method based on the test data of the flat dilatometer tests is more suitable for engineering practice. （3） This research result can provide reference for determining static earth pressure coefficient in the railway, subway, highway and other engineering survey.

关 键 词：扁铲侧胀试验 静止侧压力系数 MINDLIN解 非弹性体 

分 类 号：U455[建筑科学—桥梁与隧道工程]