碎石土地基的大型原位水平推剪试验与单环注水试验  

Large-scale in-situ Horizontal Push-shear and Constant-head Injection Test of the Gravel Soil

作　　者：许丹[1] XU Dan(China Railway 11th Bureau Group,Co.,Ltd,Wuhan 430061,China)

机构地区：[1]中铁十一局集团有限公司,武汉430061

出　　处：《科学技术与工程》2018年第10期124-129,共6页Science Technology and Engineering

基　　金：教育部博士点新教师基金(20123514120005)资助

摘　　要：为研究广州地铁十八号线陇枕停车场碎石土地基的力学强度特性及渗透规律,在典型的碎石土地基上选取了7个原位试验点,分别进行了颗粒级配分析、大型水平推剪试验和单环注水试验。研究结果表明:陇枕停车场碎石土地基呈现出缺乏中间粒径的不连续级配特征;碎石土地基强度指标与含石量关系密切,当含石量小于63%时,有效黏聚力随着含石量的增加迅速下降,有效内摩擦角随着含石量的增加迅速增加;当含石量超过临界值63%时,有效黏聚力和有效内摩擦角几乎没有变化;碎石土地基的渗透系数和含石量呈正相关关系;含石量为63%是陇枕停车场碎石土地基抗剪强度参数和渗透稳定性的关键特征值。In order to study the mechanical behavior,strength parameters and permeability of the gravel soil in Longzhen unit train yard of Guangzhou Metro Line 18,seven test points in-situ were established for particle size distribution analysis,large-scale horizontal push-shear test and constant-head injection test,quite a number of important achievements were made.The results show that lack of median diameter and gap gradation characteristics were show up in gravel soil in Longzhen unit train yard.Shear strength index were correlated to the block proportion by weight,when the block proportion is less than 63%,effective cohesive force will drop rapidly and effective internal friction angle will increase rapidly with the increase of block proportion;when the block proportion is greater than 63%,effective cohesive force and effective internal friction angle hardly any change at all.Coefficient of permeability of gravel soil has positive correlation with the block proportion.The block proportion 63%is the critical eigenvalue of gravel soil shear strength parameter and permeable stability in Longzhen unit train yard.

关 键 词：碎石土 水平推剪试验 单环注水试验 含石量 渗透系数 

分 类 号：TU43[建筑科学—岩土工程]