利用压密方程计算分析西安市地面沉降特征

Analysis of land subsidence characteristics using compaction equation in Xi'an region

利用西安市地下水位监测资料,基于水文地质三维结构模型,在不考虑粘土层滞后压缩变形的理想情况下,采用压密方程计算获得西安市抽取地下水可引起的理论地面沉降量及沉降分布特征,结果表明:计算所得沉降显著区位于西安市西南部的高新区及东南部的曲江新区,沉降量呈由北向南递增的特征,与InSAR监测结果整体趋势具有较好的一致性;地面沉降分布特征受到活动地裂缝影响,沉降曲线呈近NE向偏转展布。研究结果可为沉降灾害预防研究提供宏观的参考信息。

Using groundwater data of Xi'an area ,this paper adopts the compaction equation to calculate the theoretical value and distribution characteristics of land subsidence caused by pumping groundwater .The calculation is based on the regional hydrogeological structure model and under the ideal conditions without considering the lag compress deformation of viscous soil .T he results show that :under the ideal state ,the maximum theoretical value of land subsidence is significant accommodated at two areas .One is high-tech development zone located on the southwestern of Xi'an city ,and another is Qujiang new district located on the southeastern of Xi' an city .And the trends of the subsidence overall show an increasing from the northern to the southern .The calculated results have agreeable consistency with InSAR monitoring results .The distribution of land subsidence in Xi' an area will be also affected by the active ground fissures .The subsidence curve is nearly extending in NE direction .These results can better reflect the trend characteristics of subsidence and significant subsidence regions under the influence of pupming groundwater factor ,which can provide macro reference information for prediction of the land subsidence hazard .