广西航运枢纽工程卵砾石层岩土物理力学参数取值  

Value of rock and soil physical and mechanical parameters of gravel layer in Guangxi shipping hub project

作　　者：韦世贵 WEI Shigui(Guangxi Communications Design Group Co.,Ltd.,Nanning 530029,China)

机构地区：[1]广西交通设计集团有限公司,广西南宁530029

出　　处：《水运工程》2023年第7期180-187,共8页Port & Waterway Engineering

基　　金：国家自然科学基金面上项目(52268062)。

摘　　要：影响岩土工程参数选取的因素很多,在水电、航运枢纽工程涉及的问题更为复杂,常规的试验方法得到的指标往往不能反映真实环境条件。通过对那吉航运枢纽、鱼梁航运枢纽、老口航运枢纽在竖井、基坑等进行现场直剪、荷载试验等原位测试,并对现场取原状样进行室内试验,获取卵砾石层的物理力学参数取值基础资料,采用FRWS软件对m值进行反演分析。结果表明,卵砾石层的垂直基床系数、水平基床系数随着卵砾石层密实程度的增加而增加;依靠荷载试验得到的圆砾层基床系数比规范给出的经验值偏大,但也在合理范围之内;反演得出的m值,比规范中非岩石地基m的经验值小,鉴于规范中主要为桩基的m值,故最终结果以反演分析结果为准。There are many factors affecting the selection of geotechnical engineering parameters,and the problems involved in hydropower and shipping hub projects are more complex.The indexes obtained by conventional test methods often cannot reflect the real environmental conditions.In this paper,in-situ tests of the direct shear test and load test in Naji shipping hub,Yuliang shipping hub and Laokou shipping hub are carried out in the vertical shaft,foundation pit etc,and original samples are taken from the site for laboratory tests to obtain the basic data of the physical and mechanical parameters of gravel layer.FRWS software is used for back analysis of m values.The results show that the vertical and horizontal subgrade coefficients of cobble layer increase with the increase of cobble layer density.The subgrade coefficients of gravel bed obtained by load test are larger than the empirical values given in the code,but the values are within the reasonable range.The m values obtained by back analysis are smaller than the empirical values of m in the code which belong to the empirical value of pile foundation.So the final results shall be subject to the back analysis results.

关 键 词：岩土参数 原位测试 回归分析 荷载试验 反演分析 

分 类 号：U641[交通运输工程—船舶及航道工程]