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本文通过对省环保局科研楼地基的处理和测试,说明了在轻亚粘土中采用振动水冲桩处理地基可以达到消除液化,提高地基承载力的目的。该工程为箱形基础,地上十二层,共打入碎石桩747根,通过标贯、静力触探、荷载试验,证实了复合地基的承载能力在20~T/M~2以上,达到了予期的效果。说明振冲桩不仅适用于饱和粉细砂地基,而且也适用于轻亚粘土地基,从而扩大了振冲桩的适用范围。本文进一步以实测数据证明,在轻亚粒七中振密和置换作用同时存在,含粘七量越大振密效果越弱,而置换作用越强。在轻亚粘土中,即使小于0.05mm 的颗粒超过15%以上,同样能达到加固地基的目的。
In this paper, through the treatment and testing of the foundation of the scientific research building of the Provincial Environmental Protection Bureau, it is shown that the use of vibrating water in the light sub-clay to treat the foundation can achieve the purpose of eliminating liquefaction and improving the bearing capacity of the foundation. The project was a box-shaped foundation with 12 floors above ground. A total of 747 broken stone piles were drilled. Through standard tests, static penetration tests and load tests, it was confirmed that the bearing capacity of the composite foundation was above 20~T/M~2. Achieved the desired effect. The vibratory piles are not only suitable for saturated fine sand foundations, but also for light sub-clay foundations, thereby expanding the scope of application of vibratory piles. This paper further proves by the measured data that in the light subgrain seven vibration and displacement exist at the same time, the viscous effect is weaker, and the displacement is stronger. In light sub-clays, even if particles less than 0.05 mm exceed 15%, the purpose of reinforcing the foundation can be achieved.