以地貌单元为依据的工程地质分区研究——以武汉市都市发展区城市地质研究为例

Study on engineering geological zoning: based on geomorphologic units——A case study of the Wuhan metropolitan development area

第四纪时期的构造运动和气候变化等具有明显的阶段性特点,地貌单元即是阶段性地质演化的宏观体现。不同地貌单元的构成土体具有特定的岩性、成因、结构、构造等组合及水文地质特征。通过对武汉市地貌、第四纪地质特征(地层、成因、岩性等)及土体工程地质性质等综合调查,发现地貌单元对工程地质条件具有明显的宏观控制意义。进而提出一级地貌分区即地貌区可作为工程地质分区的依据,二级地貌分区即地貌成因类型单元可作为工程地质亚区的划分依据。据此原则,将武汉都市发展区划分出4个工程地质区和14个工程地质亚区。并根据不同地貌单元的第四纪沉积物岩性、成因及沉积环境对各个工程地质区和亚区的工程地质特性进行了讨论。

The Quaternary tectonic movement and climate change show obvious periodic characteristics.Geomorphologic unit is the macroscopic manifestation of the periodic geological evolution.The constitutive soil of different geomorphologic units has characteristic lithology,genesis,structure and hydrogeological character.On the basis of comprehensive investigation of the geomorphology,Quaternary geological characteristics(such as stratum,genesis,lithology,etc.) and engineering geological conditions of deposits in Wuhan area,it is found that the geomorphic units have a significantly macroscopic control on engineering geological conditions.Thus,we proposed that the first-level geomorphic zoning(also named as geomorphic zone) could be used as the division principle of engineering geological zoning;and the second-level geomorphic zoning(also named as the geomorphic unit of genetic type) could be used as the division principle of sub-engineering geological zoning.Based on the above division principle,Wuhan metropolitan development zone could be divided into 4 engineering geological regions and 14 sub-engineering geological regions.In addition,according to the lithology,genesis and sedimentary environment of the Quaternary sediments in different geomorphic units,the engineering geological characteristics of each engineering geological regions and sub-regions have also been discussed in this paper.