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变围压条件下粉质粘土动孔压特性试验研究
Experimental Study on Dynamic Pore Pressure Characteristics of Silty Clay with Variable Confining Pressure
投稿时间: 2017-03-24  最后修改时间: 2017-05-15
DOI:
中文关键词:  变围压  循环偏应力  粉质粘土  孔压比  GDS
英文关键词:variable confining pressure  cyclic deviator stress  silty clay  pore pressure ratio  GDS
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目);国家教育部博士点基金
作者单位E-mail
刘家顺 辽宁工程技术大学土木工程学院 liujiashun000@163.com 
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中文摘要:
      锦阜高速修建通车以来已经发生多次地基灾害事故,严重影响了交通运行的安全,增加了维护建设费用。利用GDS振动三轴试验系统开展了不排水和部分排水时循环偏应力和循环围压耦合作用下辽西地区粉质粘土的变围压循环三轴试验,研究了变围压应力路径对辽西粉质粘土的孔压影响。结果表明:变围压应力路径作用下,辽西粉质粘土孔压主要包括弹性孔压和残余孔压两部分。不排水条件时,辽西粉质粘土最大孔压比随应力路径斜率和循环动应力比增加而增大,最小孔压受循环围压影响较小;部分排水试验时,rmax u~N曲线和rmin u~N曲线表现为先升后降;当N>2500次后,孔压变化逐渐趋于平稳。最大(小)孔压比均随着循环动应力比的增大而增大,但循环围压幅值对孔压比的影响却不同。rmax u的稳定值随着循环围压幅值的增大而增大,rmin u的稳定值随着循环围压幅值的增大而减小。研究成果将为交通循环荷载作用下粉质粘土的强度特性理论研究提供科学依据,为地基灾变控制研究提供关键技术支撑。
英文摘要:
      Many foundation disaster accidents has been occurred after the Jinzhou to Fuxin highway put into use. This seriously affect the safety of traffic operation and increase the maintenance and construction costs. In order to study the pore pressure characteristics of silty clay around western part of Liaoning province, the variable confining pressure cyclic triaxial compression tests under the condition of no drainage and partial drainage conditions was carried out by using GDS three axis test apparatus. The development law of pore water pressure of silty clay around western part of Liaoning in the condition of variable confining pressure stress paths was researched. The results show that the pore water pressure of silty clay consists of two parts: elastic pore pressure which caused by cyclic confining pressure and residual pore pressure which caused by cyclic deviator stress. The maximum pore pressure ratio of K0 consolidated saturated silty increases with the stress path slope and cyclic dynamic stress ratio increasing under non drainage conditions. But the minimum pore water pressure ratio is less affected by cyclic confining pressure. The rmax u~N curves and rmin u~N curves performance for the first rise then fall under partial drainage conditions. The pore pressure gradually stabilized when number of cyclic loading was greater than 2500. The maximum and the minimum pore pressure ratio increases with the increase of cyclic stress ratio, but the influence of cyclic confining pressure amplitude on the pore pressure ratio is different. The maximum and the minimum pore pressure ratio increases with the increase of cyclic confining pressure amplitude before the values reached to the peak front value. The maximum pore pressure ratio stable values increases with the increase of cyclic confining pressure amplitude after the values reached to the peak front value but the minimum pore pressure ratio stable values decreases with the increase of cyclic confining pressure amplitude. The above research results will provide scientific basis for strength theory for silty clay under traffic cyclic loading and provide key technical support for the foundation disaster control research.
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