郑州市城区中层隧道工程地质环境适宜性评价

为了更好的为郑州市轨道交通规划提供地质依据，在对郑州市城区相关资料梳理的基础上，针对研究区地质特点，进行研究区中层隧道工程的地质环境适宜性评价。本次研究通过采用多目标线性加权函数法结合层次分析法对地质环境适宜性进行综合评价。研究结果表明:研究区中层隧道工程的地质环境适宜性影响因子主要包括15～30m地层加权平均压缩模量、15～30m地层均匀性、地下水腐蚀性、15～30m软土厚度、地面沉降以及饮用水水源地保护区，其中，地面沉降、软土以及地层均匀性对中层隧道工程影响较为显著；综合评价结果中适宜性中等区主要位于研究区东部，面积约占整个研究区总面积的24%；施工时要注意软土的分布以及地面沉降对工程的影响，其他区域为适宜性好区，面积约占整个研究区总面积的76%。在该评价区内，地层均匀，地下水腐蚀性弱，无软土分布，地面沉降速率小，加权平均压缩模量较小，在该区施工时要重点关注对饮用水水源地的保护。可见通过对郑州市中层隧道工程进行地质环境适宜性评价工作针对性较强，可以更为有效的为郑州市轨道交通规划提供地质依据。

Geo-environmental suitability assessment for tunnel in the middle layer in Urban Zhengzhou City

In order to better provide geological basis for the rail transport planning in Urban Zhengzhou City, the geo-environmental suitability assessment for tunnel in the middle layer was carried out on the basis of the related data and the geological characteristics of the study area. In the study, the multi-objective linear weighted function method and analytic hierarchy process were used to evaluate the suitability of geological environment. The results show that the factors affecting the geological environment suitability of tunnel in middle layer in the study area mainly include the thickness-weighted average compressive modulus, strata uniformity and soft clay depth between 15 to 30 meters below ground, groundwater corrosiveness, ground subsidence, drinking source water protection area. In these factors, groundwater corrosiveness, soft clay depth and strata uniformity have a significant impact on the tunnel in the middle layer. The study area can be divided into the suitable area and the middle-suitable area. The middle-suitable area is mainly located in the eastern part of the study area accounting for about 24% of the total area. In this area the distribution of soft soil and groundwater corrosiveness should be paid attention when tunneling. The suitable area accounts for about 76% of the study area. In this area, the strata is uniform, the groundwater corrosiveness is weak, no soft clay is distributed, the velocity of ground subsidence and the thickness-weighted average compressive modulus are small. But the protection of drinking water sources is important when tunneling. It is concluded that geo-environmental suitability assessment for tunnel in the middle layer in Urban Zhengzhou City can provide more effective geological basis for Zhengzhou urban rail transit planning with targeted characteristics.