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在深大基坑的开挖深度确定时,承压水水位的高低决定了承压水突涌风险的大小。研究承压水水位动态和趋势成为重要的课题。基于历史区域观测资料,结合近年来钱江新城区工程的不同观测频率的成果,进行统计分析、研究水位动态变化规律,并预测变化趋势。区内目前年平均水位介于-2~-3m,年水位波动约3m,4月份和6月份为高水位期,8月底~9月初是最低水位期。同一场地一定距离的不同点水位呈现“普遍不等,偶然相等”的现象。今后的一段时期内承压水水位将呈现稳中渐升的趋势。在无长期水位观测成果时,设计可以根据勘察所得水位,并按本文水位波动规律大致推测出基坑开挖期间的最危险水位,以确保基坑安全。
When the excavation depth of the deep foundation pit is determined, the level of the confined water level determines the risk of inrush of the confined water. It is an important issue to study the dynamic and trend of confined water level. Based on the observation data of the historical area and the results of different observation frequencies in the project of Qianjiang New Urban Area in recent years, statistical analysis is conducted to study the dynamic variation rules of water level and predict the change trend. The current average annual water level in the area ranges from -2 to -3 m. The annual water level fluctuates about 3 m. It is a high water level in April and June, and the lowest water level from the end of August to the beginning of September. At a certain distance from the same venue, the water level shows the phenomenon of “generally different, by chance”. The pressure water level will show a steady and rising trend in the coming period. In the absence of long-term water level observation results, the design can be based on the investigation of the water level, and according to this article water level fluctuation law roughly infer the most dangerous water level during excavation to ensure the safety of foundation pit.