水库蓄水对周边建筑物地基沉降的影响

Influence of reservoir water storage on the foundation settlement of surrounding buildings

针对库区蓄水后引起的地下水位和毛细水管上升对库区周边建筑物的安全影响等问题,以衡阳市土谷塘航电枢纽为依托工程,结合现场调研、室内外试验和模型预测等手段对其进行研究。通过现场平板载荷试验分析了含水率变化对土基承载能力的影响,通过室内试验进一步分析了水对典型土样其他方面力学参数的影响,然后运用有限元模拟对试验结果进行验证。研究结果表明,土基在逐级加载至600kPa过程中,含水率在天然状态和在近似饱水状态,变形模量降幅为45.9%;在淹没区范围内,当建筑物超过4层且地表高程距地下水位不足2m时,受影响较大。因此对自重较大的房屋及石拱桥要加强观测,以避免不必要的损失。

According to the reservoir problems caused by the rise of ground water and capillary water pipe,and the influence on the safety of surrounding buildings,this paper takes Tugutang navigation-power junction of Hengyang city as the case,combined with field investigation,indoor and outdoor tests and model prediction research methods to solve this problem.Through plate bearing test analysis of the water-in-fuel rate changes in the affected earth＇s carrying capacity,with the laboratory test analysis the effect of water on other aspects of mechanical parameters of typical soil samples.The finite element simulation is used to verify the results of the experiment.The results show that based in step loading to600 kPa process,the water content in the natural state and the approximate water saturated state,the deformation modulus decreased by 45.9%;In the flooded area,when the building is more than 4and the surface elevation is less than 2m,it is greatly affected,so it is necessary to strengthen the observation to avoid unnecessary loss.