| 张敏,许成顺,杜修力,王国盛,路德春.中主应力系数及应力路径对砂土剪切特性影响的真三轴试验研究[J].水利学报,2015,46(9):1072-1079 |
| 中主应力系数及应力路径对砂土剪切特性影响的真三轴试验研究 |
| True triaxial experimental research on shear behaviors of sand under different intermediate principal stresses and different stress paths |
| 投稿时间：2015-04-05 |
| DOI：10.13243/j.cnki.slxb.20150372 |
| 中文关键词: 中主应力系数 应力路径 真三轴试验 应力-应变关系 |
| 英文关键词: intermediate principal stress coefficient stress path true triaxial tests stress-strain relationship |
| 基金项目:国家重点基础研究发展计划(973计划)项目(2011CCB13600);国家自然科学基金项目(51278015);国家自然科学基金创新研究群体项目(51421005) |
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| 中文摘要: |
| 针对福建标准砂,进行了系列真三轴排水剪切试验,重点探讨了应力路径、中主应力系数对砂土应力-应变关系、广义剪应力比-应变关系及抗剪强度指标的影响,并利用试验实测的三轴拉伸和压缩条件下的内摩擦角及不同中应力系数条件下的强度实测值,验证了岩土材料非线性统一强度模型在π平面上的强度包线。试验结果表明,应力路径完全相同的情况下,砂土的抗剪强度q和广义剪应力比q/p随中主应力系数的增大而减小,强度指标?随中主应力系数的增大而增加;中主应力系数越大,砂土的剪胀特性越明显;不同应力路径对砂土应力-应变关系影响很大,但对应力比-应变关系及抗剪强度指标?的影响相对较小;岩土材料非线性统一强度模型能够很好地描述砂土的非线性强度特性。 |
| 英文摘要: |
| In order to investigate the effect of stress paths and intermediate principal stress coefficient onthe relation curves between q-e1, q/p-e1 and strength index j of sand, a series of true triaxial drained shear tests were conducted on Fujian standard sand. The strength envelope on the plane of π of nonlinear unified strength model of geo-materials was verified by the friction angle and the measured strength value. The friction angle was tested by the experiments of triaxial tension and compression,while the strength value was obtained in the cases of different intermediate principal stresses. The results show that when the stress path is exactly the same,the shearing strength parameters q and stress ratio q/p of sand decreases, but intensity index ϕ increases with increasing of intermediate principal stress coefficient. The bigger the intermediate principal stress coefficient the more obvious the shear dilatancy of sand. Different stress paths in triaxial shear test of sand havegreat influence on the shearing strength q, but for strength index ϕ and stress ratio q/p. The nonlinear strength property of sand can be described very well by the nonlinear unified strength model of geo-materials. |
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