田宗坤,彭成,谭毓清.动力作用对复合固化淤泥土力学性能的影响[J].南华大学学报(自然科学版),2020,34(2):62~68.[TIAN Zongkun,PENG Cheng,TAN Yuqing.Effect of Dynamic Action on Mechanical Properties of Composite Solidified Silt Soil[J].Journal of University of South China(Science and Technology),2020,34(2):62~68.] |
动力作用对复合固化淤泥土力学性能的影响 |
Effect of Dynamic Action on Mechanical Properties of Composite Solidified Silt Soil |
投稿时间:2019-12-11 |
DOI: |
中文关键词: 固化淤泥 动荷载 轴线累积应变 动应力-动应变曲线 动弹性模量 |
英文关键词:solidified sludge dynamic load cumulative axial strain dynamic stress-dynamic strain curve dynamic elastic modulus |
基金项目:湖南省教育厅项目(16C1380);水利部土石坝破坏机理与防控技术重点实验室开放基金项目(YK319008) |
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中文摘要: |
利用GDS(global digital system)动三轴仪对固化淤泥土开展动三轴UU试验,研究其轴向累积应变、动强度、动应力-动应变滞回曲线和动弹性模量等参数的变化规律。研究表明:固化土轴向应变随振动次数呈阶梯状分布,轴向应力较小时,固化土轴向应变先随振动次数增加而增大,随后趋于稳定,且固化掺量越高,轴向累积应变越小。固化土的动应力-动应变曲线呈应变硬化型,试样发生剪胀破坏,固化剂掺量越大,曲线越陡。复合固化剂掺量和围压越大,滞回圈的面积越小,其位置越靠近竖轴;滞回圈的面积先随振动次数的增加逐渐增大,当振动次数超过1 000次后,其面积逐渐维持稳定。经复合固化改良后,淤泥土的初始动弹性模量有显著提高,且围压越高,动弹性模量越大,但在动力作用下变化显著,当应变超过1.0%后,固化土的动弹性模量与素土变化一致。 |
英文摘要: |
A dynamic triaxial UU test was performed on the solidified sludge using GDS dynamic triaxial instrument.Axial cumulative strain,dynamic strength,dynamic stress-dynamic strain hysteresis curve,and dynamic elastic modulus were studied.The results show that the cumulative axial strain of the solidified soil is distributed stepwise with the number of vibrations.When the axial stress is small,the axial strain of the solidified soil first increases with the number of vibrations and then stabilizes.And the higher the curing amount,the smaller the cumulative axial strain.The dynamic stress-strain curve of the solidified soil is strain hardened,and the sample undergoes dilatation failure.The larger the curing agent content,the steeper the stress-strain curve.The greater the amount of compound curing agent and the confining pressure,the smaller the area of the hysteresis loop,and the closer it is to the vertical axis.The area of the hysteresis loop gradually increases with the increase of the number of vibrations.When the number of vibrations exceeds 1 000 times,its area gradually maintains stability.After the composite curing improvement,the initial dynamic elastic modulus of the silt soil is significantly increased,and the higher the confining pressure is,the larger the dynamic elastic modulus is,but it decreases rapidly under dynamic loading.When the strain exceeds 1.0%,the dynamic elastic modulus of the solidified soil is consistent with that of the plain soil. |
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