加载速率对干湿状态下珊瑚礁砂单颗粒压缩特性研究  

Study on mechanical properties of coral reefs in differentstates at different loading rates

作　　者：李天翔 侯贺营 王青 姜朋明[1,3] 潘卓杰 周爱兆 LI Tianxiang;HOU Heying;WANG Qing;JIANG Pengming;PAN Zhuojie;ZHOU Aizhao(School of Civil Engineering and Architecture,Jiangsu University of Science and Technology,Zhenjiang 212100,China;Jiangsu Province Engineering Research Center of Geoenvironmental Disaster Prevention and Remediation,Zhenjiang 212100,China;School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;Geotechnical Engineering Department,Nanjing Hydraulic Research Institute,Nanjing 210024,China)

机构地区：[1]江苏科技大学土木工程与建筑学院,镇江212100 [2]江苏省地质环境灾害及修复工程研究中心,镇江212100 [3]苏州科技大学土木工程学院,苏州215009 [4]南京水利科学研究院岩土工程研究所,南京210024

出　　处：《江苏科技大学学报（自然科学版）》2022年第6期105-111,共7页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金资助项目(51979128)。

摘　　要：为了研究加载速率对干湿状态下珊瑚礁砂单颗粒压缩特性的影响,采用干燥和浸泡两种状态下的珊瑚礁砂单颗粒开展不同加载速率的颗粒压碎试验,试验结果表明:①粒径为5~6 mm、6~7 mm、7~8 mm的珊瑚礁砂单颗粒特征抗拉强度分别为18.7、14.2、13.7 MPa,即单颗粒粒径与其特征抗拉强度成反比.②干湿状态下的珊瑚礁砂颗粒,随着加载速率的增加,动态拟合模量E V值均增大;相同的加载速率,干砂颗粒的动态拟合模量E V值比湿砂颗粒大:当加载速率分别为1、1.5、2 mm/min时,浸泡状态的拟合模量较干燥状态的拟合模量分别下降了1.86%、11.02%、24.43%.③随着加载速率的增大,干湿状态下的珊瑚礁砂颗粒破碎拟合后各粒径的分形维数D均增大;相同加载速率下,分析干湿状态下的珊瑚礁砂颗粒破碎后分形维数拟合数据可以得到,浸泡状态的珊瑚礁砂单颗粒破碎后的分形维数D比干燥状态下的珊瑚礁砂单颗粒破碎后稍大.In order to study the effect of loading rate on the compression characteristics of coral reef sand particles in wet and dry conditions,a single particle of coral reef sand in dry and immersed states is used to carry out particle crushing tests at different loading rates,the test results show that:①The characteristic tensile strength of 5~6 mm,6~7 mm and 7~8 mm are 18.7,14.2 and 13.7 MPa respectively,that is,the particle size of single particle is inversely proportional to its characteristic tensile strength.②For coral reef sand particles in wet and dry condition,as the loading rate increases,the dynamic fitting modulus E V value increases,and at the same loading rate,the dynamic fitting modulus E V of dry sand particles is larger than that of wet sand particles:when loading rates are 1,1.5 and 2 mm/min,the fitting modulus of soaking condition decreased by 1.86%,11.02%and 24.43%compared with that of dry condition,respectively.③With the increase of the loading rate,the fractal dimension D of each particle size of coral reef sand particles in the dry and wet state is broken after fitting under the same loading rate,the fractal dimension fitting data can be obtained by analyzing the fractal dimension of the coral reef sand particles in the dry and wet state,the fractal dimension D of the single particle of the soaked coral reef sand is higher than that of the coral reef sand in the dry state,and the single particle is large after crushing.

关 键 词：珊瑚礁砂 干湿状态 加载速率 颗粒破碎 分形维数 

分 类 号：TU443[建筑科学—岩土工程]