卵砾石土抗剪强度指标原位直剪试验研究

发布时间：2018-06-21 00:55

本文选题：卵砾石土 + 现场试验　；参考：《岩土工程学报》2015年S1期

【摘要】：现场大型原位直剪试验是测定卵砾石土强度指标的一种有效方法。通过对江南低山丘陵区典型卵砾石土4个试样的现场大型原位直剪试验,在获取卵砾石土抗剪强度指标的同时,还在试样剪切破坏后的破坏面上取样进行卵砾石土的颗粒粒径分析。试验结果表明:级配良好的卵砾石土原位直剪试验的剪切应力和剪切位移之间的关系曲线具有明显的峰值强度,并出现较稳定的残余强度;试验场地卵砾石土的黏聚力较低,而内摩擦角较高,卵砾石土的这种强度特性不同于一般的均质土体和碎裂岩体,与组成材料的性质、颗粒大小、粒径组成、粗糙程度、充填物的胶结程度和密实程度等因素有关。
[Abstract]:In situ direct shear test is an effective method for determining the strength of gravel soil. Based on the in-situ direct shear test of four typical boulder soil samples in the south of the Yangtze River, the shearing strength index of the gravel soil was obtained. The grain-size analysis of the gravel soil was carried out on the failure surface of the specimen after shear failure. The experimental results show that the relationship curve between shear stress and shear displacement in in-situ direct shear test of gravel soil with good gradation has obvious peak strength and stable residual strength, and the cohesive force of gravel soil is low in the test site. But the internal friction angle is higher, the strength characteristic of the gravel soil is different from the general homogeneous soil mass and the broken rock mass, and the properties of the composition material, the particle size, the particle size composition, the roughness degree, The cementation degree and the density degree of the filling matter are related.
【作者单位】：石家庄铁道大学土木工程学院;石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室;东南大学交通学院;河海大学土木与交通学院;
【基金】：河北省自然科学基金项目(E2014210021)
【分类号】：TU413

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