Research purposes: Taking the Heluoshan Tunnel of the Dali - Ruili Railway as an example,the study was done on the advanced geological forecast technology for the tunnel in fractured basalt area with tuff. Based on the advanced forecasted data, the forecast conclusion was drawn up and the appropriate engineering measures were offered for directing the tunnel construction to reduce and avoid the risk of geological disaster during construction. Research conclusions: (1) During the geological survey, the high - density resistivity method should used for shallow section of the tunnel and the CSAMT sounding should be used for the deep - buried section of the tunnel for the advanced geological forecast to the ground surface. During construction, the geological survey method, TSP method and advanced boring should be used in tunnel for the advanced geological forecast. (2 ) Based on the various data of the advanced geological forecast of all phases obtained by all means, the forecast conclusion is draw up and the proposal on the construction is offered to direct the construction. ( 3 ) The work procedure of the advanced geological forecast is presented.%研究目的:以大丽铁路禾洛山隧道为例,研究了碎裂玄武岩夹凝灰岩型隧道的超前地质预报技术,通过综合各种手段的超前预报资料,提出准确的预报结论和适宜的工程措施,及时指导隧道施工,减少和规避施工地质灾害风险.研究结论:(1)勘察期间,对隧道浅埋地段采用高密度电法、对隧道深埋地段采用CSAMT法进行地面的超前地质预报工作；施工期间,采用地质调查法、TSP法、超前水平钻等进行洞内的超前地质预报工作.(2)综合分析各阶段、各种方法手段的超前地质预报资料,提出最终预报结论和工程措施建议,及时指导施工.(3)提出了超前地质预报工作流程.
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