粗糙度对混凝土–砂土接触面力学特性的影响试验研究

doi:10.13722/j.cnki.jrme.2017.1311

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摘要为探究粗糙度对混凝土–砂土接触面力学特性的影响规律，开展不同粗糙度条件下的混凝土–砂土接触面大型直剪试验。根据钻孔灌注桩成孔后的孔径–深度曲线，采用概率统计分析的方法获得混凝土结构凸出尺寸的分布频率。基于此，分别构建表面“光滑”和“规则型”凹槽的混凝土板用于模拟实际工程中混凝土结构表面的粗糙度。提出可考虑凹槽几何参数、槽内土体扰动深度和槽宽修正的粗糙度(R)计算方法。试验研究结论如下：(1) 对于平均粒径D50＞0.7 mm的粗砂和细砾，其剪切带厚度约为5D50；(2) 对于“规则型”凹槽的混凝土–砂土接触面，其峰值应力比随lgR近似呈线性增长；峰值、残余应力比均随法向应力的增加而减少。(3) 接触面剪胀角随粗糙度的增加而增大，随法向应力的增加而递减。高法向应力抑制剪胀，并弱化粗糙度对剪胀的影响。(4) 归一化接触面峰值摩擦因数Ep随lgR的增加而线性递增，当R增至0.70 mm时，Ep＞1，说明由于“被动阻力”的存在，砂土的自身切剪强度不是“规则型”混凝土–砂土接触面剪切强度的上限。

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	金子豪1
	杨奇1
	2
	陈琛1
	冷伍明1
	2
	郭风琪1
	2
	赵春彦1
	2

关键词 ：土力学, 大型直剪试验, 混凝土&ndash, 砂土接触面, 粗糙度, 应力比, 剪胀, 归一化接触面峰值摩擦因数

Abstract：Large-scale direct shear tests were conducted to study the effects of roughness on the mechanical behaviors of concrete-sand interface. The distribution frequency of the bulge size of concrete surface was obtained using the method of statistical analysis based on the curves of the diameter of holes versus depth of bored piles. The concrete slabs with the smooth surface and regular grooves were manufactured to simulate the surface roughness of concrete structures in engineering practice. A new method was proposed to calculate the surface roughness(R) of concrete considering the groove geometry，the disturbed soil volume and the efficient width of groove. The shear band thickness was found to be about 5 times of the average diameter(D50) for the coarse sand and fine gravel with a D50 value greater than 0.7 mm. The peak stress ratio increased approximately linearly with R in a semi-logarithmic scale for concrete-sand interfaces with regular grooves，and the peak and residual stress ratio decreased with the increasing of normal stress. The interface dilation angle increased with the increasing of R but decreased with the increasing of normal stress，implying that the high normal stress restrained the interface dilation behavior and reduced the effects of R on interface dilation. The normalized interface friction coefficient (Ep) increased linearly with R in a semi-logarithmic scale and became greater than 1.0 when R was greater than 0.70 mm. It is thus concluded that the shear strength of sand may not be the up limit of shear strength of concrete-sand interfaces with regular grooves because of“passive resistance”.

Key words： soil mechanics large-scale direct shear test concrete-sand interface roughness stress ratio dilation normalized peak interface friction coefficient

引用本文:

金子豪1，杨奇1，2，陈琛1，冷伍明1，2，郭风琪1，2，赵春彦1，2. 粗糙度对混凝土–砂土接触面力学特性的影响试验研究[J]. 岩石力学与工程学报, 2018, 37(3): 754-765.
JIN Zihao1，YANG Qi1，2，CHEN Chen1，LENG Wuming1，2，GUO Fengqi1，2，ZHAO Chunyan1，2. Experimental study on effects of the roughness on mechanical behaviors#br# of concrete-sand interface. , 2018, 37(3): 754-765.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1311 或 http://www.rockmech.org/CN/Y2018/V37/I3/754

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