摘要
土遗址在我国分布广泛,形式繁多,随着遗址的暴露时间增长,其力学性能会出现一定的劣化现象.以开封市新郑门遗址土作为研究对象,取暴露时间不同的土样进行直剪实验及室内固结实验,得到了不同暴露时间下遗址土的抗剪强度及压缩模量.实验结果表明:随着暴露时间的增长,土体抗剪强度和压缩模量均有一定程度的降低.经分析,开挖引起的土体卸载回弹、环境温度及湿度变化是其性能劣化的主要原因.对实验结果进行数学拟合,得出遗址土的黏聚力、内摩擦角及压缩模量的劣化规律.在开挖的早期时间内,遗址土的力学性能劣化幅度较大,随着暴露时间的进一步增长,其劣化速度有一定减缓.依据实验结果及其影响因素,提出了相应的保护措施,为土遗址的保护提供参考.
Earthen sites in China are widely distributed in many forms.As the site’s exposure time increases,its mechanical properties will deteriorate to some extent.In this paper,the soil of Xinzhengmen site in Kaifeng is taken as the research object.Soil samples with different exposure times were used for direct shear test and indoor consolidation test.The shear strength and compressive modulus of the site soil under different exposure time were obtained.The test results show that with the increase of exposure time,the shear strength and compressive modulus of the soil decrease to a certain extent.After analysis,unloading rebound of the soil caused by excavation,changes in ambient temperature and humidity are the main reasons for its performance degradation.The test results were mathematically fitted to obtain the degradation law of cohesion,internal friction angle,and compression modulus of the site soil.In the early period of excavation,the deterioration of the mechanical properties of the site soil is large.With the further increase of the exposure time,the deterioration rate of the site soil will slow down.According to the test results and their influencing factors,corresponding protection measures are proposed to provide a reference for the protection of soil sites.
作者
汪银伟
孔德志
李合群
WANG Yinwei;KONG Dezhi;LI Hequn(Henan University,Laboratory of Recycled and Functional Building Materials,Henan Kaifeng 475004,China;Henan University,Institute of Geotechnical and Rail Transit Engineering,Henan Kaifeng 475004,China)
出处
《河南大学学报（自然科学版）》
CAS
2021年第2期218-223,共6页
Journal of Henan University:Natural Science
基金
国家自然科学基金资助项目(51508163)
河南省科技发展计划项目(142102210391)
关键词
遗址土
力学性能
室内实验
劣化规律
site soil
mechanical property
laboratory test
deterioration law
作者简介
汪银伟(1995-),男,河南商丘人,硕士研究生,研究方向:岩土工程;通信作者:孔德志,E-mail:dezhikong@126.com
