石灰改性淤泥的抗压和抗剪强度试验研究

发布时间：2018-12-25 14:27

【摘要】：对未改性淤泥和石灰改性淤泥进行无侧限抗压强度试验,得到了长期养护90 d和360 d试样的应力应变关系、抗压强度、变形模量和破坏应变。通过固结排水直接剪切试验,得到淤泥固化前后的剪切应力位移关系、凝聚力和内摩擦角。结果表明:石灰的掺入使试样破坏应变明显减小,无侧限抗压强度和变形模量显著增加;石灰掺量达到某种程度后,继续添加石灰并不能改善土体力学性质,反而会引起劣化效果;抗压强度与变形模量之间服从线性关系,抗压强度与破坏应变之间服从幂函数关系;石灰掺量和法向压力变化会诱发试样剪切应力位移曲线发生变化;石灰可有效提高淤泥试样的凝聚力,但对内摩擦角并无显著影响。
[Abstract]:The unmodified silt and lime modified silt were tested under unconfined compressive strength. The stress-strain relationship, compressive strength, deformation modulus and failure strain of the specimens for 90 days and 360 days of long-term curing were obtained. Through direct shear test of consolidation drainage, the shear stress displacement relation, cohesion and internal friction angle of silt before and after solidification are obtained. The results show that the failure strain of the specimen is obviously decreased and the unconfined compressive strength and deformation modulus are obviously increased with the addition of lime. When lime is added to a certain extent, the mechanical properties of soil can not be improved by adding lime, on the contrary, the degradation effect will be caused, the relationship between compressive strength and deformation modulus is linear, the relationship between compressive strength and failure strain is power function, the relationship between compressive strength and failure strain is power function. The change of lime content and normal pressure will induce the change of shear stress-displacement curve, lime can effectively improve the cohesion of silt specimen, but has no significant effect on the angle of internal friction.
【作者单位】：国核电力规划设计研究院;武汉大学土木建筑工程学院;
【基金】：中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1506) 武汉大学中央高校基本科研业务费专项资金项目(2042016kf0048)
【分类号】：TU447

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