加、卸荷应力路径对粉土应力-应变关系影响的试验研究——基于平面应变条件
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摘要
采用新型平面应变仪进行竖向加荷试验与侧向卸荷试验,探究加、卸荷路径对粉土应力-应变关系的影响,结果表明:加、卸荷路径下,粉土的应力-应变曲线明显不同;卸荷路径下,试样发生破坏时的偏应力和应变明显小于加荷路径;侧向卸荷路径下,试样的极限竖向应变随着初始固结应力的增大而增大。
The vertical loading test and lateral unloading test are carried out by using a new plane strain apparatus to investigate the influence of the loading and unloading paths on the stress-strain relationship of silt. The results show that the stress-strain curves of silt under the loading and unloading paths are significantly different. Moreover,when the specimen fails under the unloading path,the deviatoric stress and strain are obviously smaller than that under the loading path. The ultimate vertical strain of the specimen under the lateral unloading path increases with the increase of the initial consolidation stress.
The vertical loading test and lateral unloading test are carried out by using a new plane strain apparatus to investigate the influence of the loading and unloading paths on the stress-strain relationship of silt. The results show that the stress-strain curves of silt under the loading and unloading paths are significantly different. Moreover,when the specimen fails under the unloading path,the deviatoric stress and strain are obviously smaller than that under the loading path. The ultimate vertical strain of the specimen under the lateral unloading path increases with the increase of the initial consolidation stress.
引文
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[5]汤斌,曾哲,汪洪星,等.软黏土卸荷变形特性室内试验研究与数值模拟[J].工程地质学报,2011,19(4):455-459.
[6] SL237-1999土工试验规程[S].北京:中国水利水电出版社,1999.
[7]刘祖典,郭增玉,陈正汉.黄土的变形特性[J].土木工程学报,1985(01):69-76.
[2]张淑朝,张建新,伊尧国.粘性土的卸荷应力路径试验研究[J].工程勘察,2016(5):21-25.
[3]王沛,柴寿喜,李晶,等.侧向卸荷路径下天津滨海软土强度参数试验研究[J].天津城市建设学院学报,2012,18(4):243-245.
[4]王祥秋,杨文涛,刘文添.珠三角地区典型软土卸荷力学特性研究[J].公路工程,2014,39(6):69-72.
[5]汤斌,曾哲,汪洪星,等.软黏土卸荷变形特性室内试验研究与数值模拟[J].工程地质学报,2011,19(4):455-459.
[6] SL237-1999土工试验规程[S].北京:中国水利水电出版社,1999.
[7]刘祖典,郭增玉,陈正汉.黄土的变形特性[J].土木工程学报,1985(01):69-76.