从环境地质角度议郑州市城建发展布局

A STUDY RELATED TO DEVELOPMENT DISTRIBUTION OF ZHENGZHOU URBAN CONSTRUCTION FROM ENVIRONMENTAL GEOLOGY

该文以环境地质为基础 ,宏观上从地形地貌、上第三系底板的埋深变化、古代商墓发掘埋深情况和新构造运动中老鸦陈断层的西盘上升、东盘下降 4 0 0m等 ,论述了郑州东部地区沉降幅度远大于西部地区。微观上通过郑州市东、西部地基土体条件及其土体试验数据 ,并通过理论计算 ,设定土体地震液化判别 ,指出了东部地区由于沉降幅度较大、地基土体较差、地下水位较浅 ,在地震烈度ⅤⅡ～ⅤⅢ度时 ,存在土体液化的可能性 ,尤以金水一区最甚。作者还对建筑物作了实地考察 ,证实东部某些建筑已产生贯通裂隙。该文认为 :在郑州市东部进行大规模城建不利于地震设防的要求 ;在建筑物地基加固处理上东部比西部要多 1/2～ 1/3的基础投资 ,因而是不经济的。结论是 :郑州市城建发展条件应是西部地区优于东部地区 ,其发展布局重点宜在西部地区。

Take the environmental geology as foundation,macroscopically,the article discusses that the subsidence amplitude of east part of Zhengzhou City far is large than that of west part according to the following facts:landform,the changing of buried depth of the bottom beds of Neogene system,the state of buried depth by excavated tombs of Shang Dynasty and the fact that the west wall of Lao Ya-chen fault(Zhengzhou)ascended and its east wall descended about 400m;Microscopically,according to the state of the foundation soil mass and its testing and theoretic calculated data,the conclusion is that the east part is the possible of soil mass liquation when the earthquake intensity is 7～8 degree,especially the Jinshui District,due to its large subsidence amplitude,bad foundation soil mass,and shallow underground water level.So we have considered it will go against the requirement of earthquake defence to develop urban construction in large scale at east part of Zhengzhou and its basic investment of foundation reinforcement is more than that of west part about 1/2～1/3 So that it’s uneconomical.Conclusion:the key district of distribution of urban construction should be at west part of Zhengzhou.