荷载历史对砂土最大剪切模量影响的共振柱试验研究

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摘要利用共振柱的非共振模式对干砂试样施加先期动荷载，系统研究先期循环次数、预荷载频率、动预应力比、密实度、制样方法、先期剪切模式及围压静置时间等因素对砂土最大剪切模量的影响。试验结果表明：当先期循环次数小于某一阈值时，最大剪切模量随循环次数的增大而衰减；当达该阈值时，模量衰减率可达20%以上；之后，随循环次数增大而增长。最大剪切模量随循环次数的衰减程度随预荷载频率、动预应力比及砂土密实度的增大而减小，但其定性规律不受制样方法及先期剪切模式的影响。经历先期动荷载后，砂土最大剪切模量随围压固结时间的增长率仍很小，但较新鲜试样略大。砂土最大剪切模量随先期循环次数的变化关系是砂土结构密实化、土粒磨损作用、颗粒再定向或颗粒配位数定向共同影响的结果。

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关键词 ：土力学, 最大剪切模量, 动预应力比, 预荷载频率, 相对密度, 颗粒再定向, 磨损作用

Abstract：Effects of number of cycles，preloading frequency，dynamic prestress ratio，density，sampling technique，preshearing mode and duration of confinement on the maximum shear modulus(Gmax) of sand were systematically investigated by applying the preloading to the tested dry sand samples using the non-resonant vibration supplied by resonant column apparatus. Testing results indicated that：(1) The Gmax of dry sand decreased with increase of number of cycles when it was lower than a threshold number. At this threshold number，the maximum reduction of Gmax might be over 20% for some cases. (2) However，beyond this threshold number，Gmax started to recover with increasing number of cycles. The reduction of Gmax with number of cycles decreased with the increases of preloading frequency，dynamic prestress ratio and sample density；but their qualitative relationship was not affected by the sampling method and preshearing mode. The increase of Gmax with confinement duration was minor and the increase rate was slightly greater for the sample with preloading than that without preloading. The variation of Gmax with number of cycles may be accounted for the jointed effects of sample densification，interparticles wear process and particles reorientation or coordination number reorientation.

Key words： soil mechanics maximum shear modulus dynamic prestress ratio preloading frequency relative density particles reorientation wear process

收稿日期: 2011-03-30

引用本文:

柏立懂1，2. 荷载历史对砂土最大剪切模量影响的共振柱试验研究[J]. 岩石力学与工程学报, 2011, 30(11): 2366-2374.
BAI Lidong1，2. EFFECTS OF LOADING HISTORY ON MAXIMUM SHEAR MODULUS OF SAND BY RESONANT COLUMN TESTS. , 2011, 30(11): 2366-2374.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I11/2366

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