为消除山区铁路泥石流灾害威胁，确保铁路长期运营安全，结合成昆铁路峨攀段K295泥石流灾害整治工程，分析泥石流灾害情况、规模、分区、成因、危害程度及发展趋势等。基于“以疏为主、兼顾防护”的整治思路，采用“基底注浆加固+导流式渡槽明洞+隧底泄水涵+导流槽+急流槽”的综合处治方案。为避免明洞现浇造成既有铁路运营中断，综合考虑现场地形、结构安全及施工工期，创新地在既有运营铁路上采用明洞拱圈预制拼装技术方案，减小了施工作业与铁路运输的相互干扰，大幅缩短了工期。
A case study is conducted on the K295 debris flow
disaster regulation project of the ChengduKunming railway to minimize
the risk arising from mountainous railway debris flow and ensure longterm operational safety of the railway. In addition, the situation,
scale, zoning, causes, damage extent, and development trend of debris flow
disaster are analyzed. Further, a comprehensive debris flow disaster treatment
method involving base grouting reinforcement + diversion aqueduct opencut tunnel + tunnel bottom discharge culvert + diversion channel +
chute is proposed based on the idea of "focusing on drainage and giving
consideration to protection". A technical scheme of prefabrication and
assembly of the opencut tunnel arch ring on the
existing operating railway is innovatively proposed to ensure normal railway
operation during the castinplace
construction of the opencut tunnel. Factors such as
the onsite terrain, structural safety, and
construction period are comprehensively considered. The proposed scheme
minimizes the interference between the construction operation and railway
transportation and greatly shortens the construction period.
