Analysis and research on technical parameters of high-power vibro-vibration reinforcement for ultra-deep soft soil foundation
The cofferdam in the upper reaches of Lawa Hydropower Station is 60 m high and its foundation is com-posed of low liquid limit clay and silty soil layers about 50 m thick deposited by barrier lake sediments.In order to ensure the safety and reliability of cofferdam construction,it is necessary to strengthen the deep soft soil foundation by utilizing vibro-replacement columns.Based on 158 million measured data collected by the remote construction control platform of the Internet of Things,this study estimated the volume replacement rate and column diameter of the vibrio crushed stone column,and initially evaluated the reinforcement effect of the composite foundation of the vibrio crushed stone column.The results show that the column spacing has a significant effect on the volume re-placement rate.When the spacing is 2.5 m,the average column diameter is 1.16 m and the volume replacement rate is 15.10％.When the spacing is 3.0 m,the average column diameter is 1.09 m,and the volume replacement rate is 10.87％.The study also found that the hardness of the stratum and the level of construction operation will af-fect the diameter of the column,and local diameter reduction is easy to occur at the weak interlayer.The length of the encryption section should be strictly controlled within the range of 0.5-1.0 m,and the encryption current and vibration retention time should be controlled to meet the construction standards.Based on the application of intelli-gent construction monitoring system,this study provides preliminary results of scientific demonstration for the quali-ty control and detection of vibro-replacement stone column reinforcement treatment on deep soft soil foundation and comprehensive evaluation of the reinforcement effect of composite foundation,and can provide reference for the re-inforcement design of vibro-replacement stone column.
deep covering layervibro-replacement stone columnIOT remote construction controlencryption currentreplacement ratecolumn diameterquality effect evaluation
万方数据
维普
