摘要
为探讨常德地区土动力学参数的统计规律,收集了常德地区区域性地震安全评价和工程场地地震安全评价中的土动力特性试验资料,归纳整理了132组常德粉质黏土土样的动力特性数据,对常德地区不同埋深范围的粉质黏土,统计了其动剪切模量比和阻尼比随剪应变变化的规律,给出了常德地区粉质黏土动力特性的统计值,并选取2个典型场地进行土层地震反应计算,与相近研究进行了对比分析,探讨了本文统计值的适用性。研究结果表明,常德地区粉质黏土动剪切模量比的统计值均高于推荐值和规范值,而阻尼比统计值均小于推荐值和规范值;常德地区粉质黏土的土动力学参数采用规范值和推荐值时可能会对工程建设项目的抗震设防产生不利影响,应谨慎选取,而该文的统计值比规范值和推荐值更适用于常德地区。
To investigate the statistical characteristics of soil dynamic parameters in the Changde area,test data on soil dynamic characteristics from regional seismic safety assessments and engineering site seismic safety evaluations conducted in this region were collected.A total of 132 sets of dynamic characteristic data pertaining to silty clay soil samples from Changde were compiled and analyzed.The variation trends of the dynamic shear modulus ratio and damping ratio for silty clay at different burial depths in the Changde area were statistically examined with respect to shear strain.The statistical values representing the dynamic characteristics of Changde silty clay are presented.Two typical sites were selected for conducting seismic response calculations on soil layers,followed by a comparative analysis with similar studies to assess the applicability of the statistical values derived in this paper.The results indicate that the statistical values for the dynamic shear modulus ratio of Changde silty clay exceed both recommended and code values,whereas the statistical values of damping ratios fall below these benchmarks.Utilizing code or recommended values for soil dynamic parameters related to Changde silty clay may adversely impact seismic fortification efforts in engineering construction projects,and should be approached with caution.The statistical values provided herein are deemed more appropriate for application within the Changde area compared to existing code and recommended standards.
作者
屈建民
汤子涵
尹志勇
景立平
陈润芝
侯志刚
QU Jianmin;TANG Zihan;YIN Zhiyong;JING Liping;CHEN Runzhi;HOU Zhigang(Hunan Bolian Engineering Testing Co.,Ltd.,Changde 415000,China;Furong College,Hunan University of Arts and Science,Changde 415000,China;Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Changde Earthquake Agency,Changde 415000,China)
出处
《自然灾害学报》
北大核心
2025年第6期150-158,共9页
Journal of Natural Disasters
基金
湖南省自然科学基金项目(2024JJ7299)
2023年中央引导地方科技发展资金项目(2023ZYQ081)
常德市武陵区2022年度科学技术研究与开发项目(8)
湖南省教育厅科学研究项目(24B0627)。
关键词
常德地区
粉质黏土
动剪切模量比
阻尼比
峰值加速度
Changde area
silty clay
dynamic shear modulus ratio
damping ratio
peak acceleration
