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为了开封玉皇阁保护工程设计研究,对玉皇阁基坑降水进行了有限元分析,考虑了土体降水后固结和支护结构产生变形共同作用下基坑土体的沉降。结果表明,降水瞬时沉降、支护结构位移及土体固结都对地面沉降有影响:降水的影响范围广,土体沉降大且和降水后的地下水位高度有关;支护结构变形的影响区域较小,约在基坑深度范围内;固结沉降较小。采取止水帷幕和坑内降水方法能有效降低坑外的地下水位降深,若同时采取坑外补水方式则更能有效弥补坑外地下水位的降差,对维护坑外周围土体沉降有更好的作用。其结果可为古建筑保护的基坑降水工程提供参考。
In order to study the engineering design of Kaifeng Yuhuangge protection, the finite element analysis of the foundation pit of Yuhuang Pavilion was carried out, and the settlement of the foundation pit soil under the combined effect of deformation and supporting of the soil structure after precipitation was considered. The results show that instantaneous precipitation, supporting structure displacement and soil consolidation all have an impact on land subsidence: the impact of precipitation is wide, and the settlement of soil mass is large and the height of groundwater table after precipitation is affected. The affected area of supporting structure deformation Smaller, about the depth of the pit; consolidation settlement smaller. Adopting the water-stopping curtain and the method of in-pit precipitation can effectively reduce the drop of the groundwater level outside the pit. If adopting the method of pumping water outside the pit at the same time, it is more effective to make up for the drop of the water level outside the pit and to settle the soil around the maintenance pit. Role. The result can provide a reference for foundation pit dewatering project protected by ancient buildings.