路用土石混合料的剪切特性试验研究

发布时间：2018-01-15 08:13

本文关键词：路用土石混合料的剪切特性试验研究　出处：《地下空间与工程学报》2014年01期 　论文类型：期刊论文

【摘要】：路用土石混合料是一种不同于土和岩石的高度非均质材料。混合材料的变形和剪切强度参数主要受含石率、块石形状和土体性质的影响。通过现场取样,综合考虑三个因素的影响,开展室内大型直剪试验。研究结果表明:应力应变关系曲线表现出三个阶段;碎石与土组成的混合料抗剪强度大于同等混合比例的卵石与土组成的混合料;含石率为40%~60%时,混合料抗剪强度较好;粘土与块石的混合料含石率较低时,低围压下表现为剪胀,高围压下表现为剪缩,含石率较高时,低围压和高围压均表现为剪胀;砂土与块石的混合料在低围压和高围压下均表现为剪胀。为快速评测现场土石混合料的粘聚力和内摩擦角,本文还提出了一种实用、简便的估算方法。
[Abstract]:The road with earth and rock mixture is a highly heterogeneous material in different soils and rocks. The deformation and shear strength parameters of hybrid materials is mainly affected by the sand content, the shape of block stones and soil properties influence. Through field sampling, considering the three factors, to carry out direct shear test results.: the stress-strain curve shows three stages; mixture of gravel and soil shear strength is greater than the same mixing proportion of mixture composed of gravel and soil composition; sand content is 40%~60%, the mixture of shear strength is better; clay and stone mixture containing stone rate is low, low under confining pressure displays dilatancy pressure, shear contraction under high confining rock, high rate, low confining pressure and pressure were high confining dilatancy; sand mixed with stone material under low confining pressure and high confining pressure showed dilatancy for rapid evaluation of site soil rock mixture material In this paper, a practical and simple method for estimating the cohesive force and the internal friction angle is also proposed.

【作者单位】：同济大学岩土及地下工程教育部重点实验室;同济大学地下建筑与工程系;
【基金】：国家自然科学基金资助项目(40772179,41072206) 贵州省交通厅科技项目(2010-122-010-3-1)
【分类号】：U414
【正文快照】： 1引言随着现代化建设的进行,土石混合料在工程中的应用越来越广泛。在我国西部山区,存在着大量的土石混合沉积地层,为减少开挖和回填的工程量,常考虑采用原位混合体材料作为路基材料,这种材料多由不同类型的粘土、块石组成,其变形和力学性质不同于土体和级配优良的人工碎石土

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