瓦纳温泉发育特征及其对隧道工程影响分析

瓦纳温泉是当地有名的温泉之一,西南某新建铁路隧道距离该温泉约1. 5km,温泉对隧道工程带来的影响是勘察设计人员重点关注的问题。在收集相关资料与结合现场调查的基础上,分别从地热背景、水化学特征、同位素特征、热储温度、埋藏深度及地热水成因类型等方面进行分析,得出瓦纳温泉的发育特征。在该温泉是断裂型成因的结论上,重点结合隧址区构造发育特征,宏观上对隧道高地温风险进行初判。通过钻孔实测温度数据分析隧道热害等级,并进一步分析预测隧道高地温分布段落及其分布规律。针对隧道高地温段落提出相应的施工建议。

Analysis of Development Characteristics of Wana Hot Spring and Influence on Tunnel Project

Wana hot spring is one of the local famous hot springs and there is railway tunnel 1. 5 km away from it in the southwest. The influence of the hot spring on the tunnel engineering is the key issue for survey designers. Based on the collected relevant data and field investigation,this paper obtains the development characteristics of Wana hot spring with the analysis of the geothermal background,hydro-chemical characteristics,isotopic characteristics,thermal storage temperature,buried depth and geothermal water origins. Then,based on the conclusion that the hot spring is the cause of fractures,the risk of tunnel high temperature is initially judged with a view to the structural development characteristics of the tunnel area. And through temperature data measured from the borehole,tunnel thermal damage grade is analyzed,and the high ground temperature distribution section and its distribution rule are further analyzed and predicted. Finally,corresponding construction suggestions specific to tunnel high ground temperature section are put forward.