泥皮对花岗岩残积土与结构接触面力学特性影响的试验研究
发布时间：2018-12-07 09:09
【摘要】：钻孔灌注桩在铁路桥梁中被广泛采用,但施工中残留泥皮难以避免。利用土工直剪仪对夹有泥皮的花岗岩残积土与混凝土板接触面的力学特性进行试验研究,分析泥皮厚度和含水率对接触面抗剪特性的影响。结果表明:随着泥皮厚度的增大,接触面的抗剪强度下降,接触面土体的剪胀性降低;法向应力越大,接触面抗剪强度降低的幅度越大;泥皮不存在时,接触面的抗剪以摩擦为主,而泥皮存在时,接触面的抗剪作用力以黏聚力为主;增大泥皮含水率和增大法向应力均会导致接触面土体的剪胀性降低,含水率对接触面摩擦角的影响大于对黏聚力的影响。
[Abstract]:Bored cast-in-place piles are widely used in railway bridges, but it is difficult to avoid the residual mud in construction. The mechanical properties of the interface between granite residual soil and concrete slabs with mud crust were studied by means of a geotechnical direct shear apparatus, and the effects of the thickness of mud skin and moisture content on the shear properties of the contact surface were analyzed. The results show that the shear strength of the contact surface decreases and the shear dilatancy of the soil decreases with the increase of the thickness of the mud skin, and the greater the normal stress, the greater the shear strength of the contact surface decreases. When the clay skin does not exist, the shear resistance of the contact surface is mainly friction, while the shear force of the contact surface is the cohesion force when the mud skin exists. Increasing the soil moisture content and increasing the normal stress will decrease the shear dilatancy of the contact surface soil, and the effect of moisture content on the friction angle of the contact surface is greater than on the cohesive force.
【作者单位】： 中国铁道科学研究院深圳研究设计院;中国建筑一局(集团)有限公司华南区域公司;深圳大学土木工程学院;
【基金】：国家自然科学基金(51478273) 中国铁道科学研究院基金(2015YJ126) 深圳市基础研究项目(JCYJ20140418095735556)
【分类号】：U443.154
本文编号：2366961
[Abstract]:Bored cast-in-place piles are widely used in railway bridges, but it is difficult to avoid the residual mud in construction. The mechanical properties of the interface between granite residual soil and concrete slabs with mud crust were studied by means of a geotechnical direct shear apparatus, and the effects of the thickness of mud skin and moisture content on the shear properties of the contact surface were analyzed. The results show that the shear strength of the contact surface decreases and the shear dilatancy of the soil decreases with the increase of the thickness of the mud skin, and the greater the normal stress, the greater the shear strength of the contact surface decreases. When the clay skin does not exist, the shear resistance of the contact surface is mainly friction, while the shear force of the contact surface is the cohesion force when the mud skin exists. Increasing the soil moisture content and increasing the normal stress will decrease the shear dilatancy of the contact surface soil, and the effect of moisture content on the friction angle of the contact surface is greater than on the cohesive force.
【作者单位】： 中国铁道科学研究院深圳研究设计院;中国建筑一局(集团)有限公司华南区域公司;深圳大学土木工程学院;
【基金】：国家自然科学基金(51478273) 中国铁道科学研究院基金(2015YJ126) 深圳市基础研究项目(JCYJ20140418095735556)
【分类号】：U443.154
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