浅析四川成都龙泉山城市森林公园主要环境地质问题

Environmental geology of the Longquanshan urban forest park, Chengdu, Sichuan

关键词:  城市森林公园  环境地质  地质灾害  浅层瓦斯  地下水污染

Key words:  urban forest park  environmental geology  geological hazard  shallow gas  underground water pollution

摘要:

本文在梳理前人研究成果的基础上，结合野外实地调查和样品分析数据，分析了四川成都龙泉山城市森林公园的主要环境问题。研究表明，龙泉山城市森林公园总体地质环境条件较好，其总体规划和地质环境相适宜，在建设过程中需要关注局部地区的地质灾害发育、浅层地下空间瓦斯赋存和地下水污染等环境地质问题。区内主要地质灾害发育类型为小型滑坡，其次为崩塌和不稳定斜坡，多发生于龙泉山复背斜核部及断裂带区域，建设旅游道路和游憩设施时，要加强防范。区内局部浅层地下空间瓦斯赋存，建议在园区内进行地下工程建设时，进行超前地质预报，在施工过程中要加强瓦斯浓度监测与通风，注意火源管控。区内浅层地下水类型主要为HCO₃-Ca·Mg和HCO₃-Ca型，局部地区浅层地下水因人类活动而受到污染，其中总硬度、氨氮、氯化物等超标，建议加强公园内重点规划建设区域的地下水用途管控和生态环境保护。

Abstract:

The present paper gives a detailed examination on the environmental geology of the Longquanshan urban forest park in Chengdu, Sichuan on the basis of the previous results and analytical data of the selected samples in this study. On the whole, the Longquanshan urban forest park has good geological conditions, and the overall planning schemes of the urban forest park are suitable for the geological conditions of the Longquanshan area. However, particular attention should be drawn to the geological hazards developed in local parts, gas accumulation in shallow underground spaces and local groundwater pollution. The geological hazards consist dominantly of small-scale landslides, collapses and unstable slopes developed in the coral part of the Longquanshan anticline and fault zone. The construction of tourist roads and recreational facilities should steer clear of the above-mentioned geological hazards. The advanced geological forecasting, monitoring of gas concentration and ventilation, and fire source control should be strengthened in the construction of underground engineering projects. The underground water types include the HCO₃-CaMg type and HCO₃-Ca types. Affected by the human pollution, the total hardness, ammonia nitrogen and chlorides in the shallow underground water in local parts are all out of standard. It is suggested that much attention should be given to the management and control of groundwater utilization and ecological environmental protection in the key areas of the Longquanshan urban forest park.