软质岩屑地基土的工程性质及其改良

The Geotechnical Properties and Improvement of soft Debris

本文论及的软质岩屑属于特殊上范畴。广泛分布于我国西部的矿区。在低湿度条件下此类士的外观类似于粗粒土，即中、粗砂；具有高渗透性与中压缩性；遇水浸湿则软化成具有一定塑性的粉质土，且在浸湿过程中显示湿陷性。是一种亚稳定结构的特殊土。在现行的国家标准《土的分类标准》中未曾涉及。本文从物质来源、沉积环境阐述其成因类型及分布特征，根据原位测试成果提出岩屑土在不同含水量条件下的地基承载力及变形多数确定准则，并就该类土的地基改良做简要论述。

The soft debris discussed in this paper is one kind ofparticular soils. It is popular distributed in west coal mine re-qions province,China. It is similar to coarse soil,high perme-able and medium compressible, but it can be soften up into asilty soil. Its plasticity index is 5.6～5.7. It is collapse sensi-tive, high compressible and strength is decreased as it is im-mersed. It belongs to a collapsible soil as well.It has not beenelaberated on in unified soil classification. In this paper,thetype of soilforming factors and characteristic of distributionhave been discussed on its material source and sedimentary en-vironment. The geotechnical properties also have been dis-cussed on its composition and index of soil properties.Accord-ing to the results of insitu testing,including the plate loadingtest and cone penetration test, etc.,the bearing capacity anddeformation parameters of the ground have been recommend- ed.In this paper , the effect of ground stabilization using dy- namic consolidation or vibroflotation method has been dis- cussed briefly.