地面沉降模拟分析中几个基本问题的讨论

THE COMMENT ON SOME FUNDAMENTAL PROBLEMS OF LAND SUBSIDENCE MODELING

天津是我国地面沉降灾害较严重的城市之一。实测资料表明：在地面沉降发展过程中存在着沉降漏斗中心偏移和土体中总应力变化两个重要现象。作者认为：目前普遍采用的总沉降量的计算公式不仅不能反映上述现象的本质，而且在理论上存在严重缺陷；同时，指出了普遍采用的Ｄｒｕｃｋｅｒ公式成立下的增量型有限元法分析不可能反映土体压缩的本质；最后，对地下水抽灌过程中流体与土体的能量关系进行了讨论。

Two important phenomena of land subsidence center displacement and total stress change in Tianjin are presented. The sum subsidence equation widely used now not only can't reflect these phenomena, but also exist obvious defects, and the cause of contradiction with classical finite element-plastic element analysis is also discussed. Correct control equations to model and subsidence under energy condition is further investigted.