重大水利工程下矿产开采对其安全影响评价及加固措施研究

STUDY ON SAFETY IMPACT ASSESSMENT AND REINFORCEMENT MEASURES OF COAL MINING UNDER IMPORTANT HYDRAULIC ENGINEERING

针对我国矿产资源开发给相关重大水利工程的安全带来隐患这个严重的现实问题,结合实际工程,首先根据相邻矿区开采沉陷现场监测曲线,运用数值模拟方法对杨村矿区岩土体力学参数进行反演分析;然后利用数值模拟软件中的弹塑性模型和流变模型及概率积分法开展煤层开采对西淝河左大堤安全的影响评价。根据现行国家相关规程和我国40多年堤下开采实践经验,初步提出西淝河左大堤受采动影响的抗变形控制指标和折减指标。在上述研究成果的基础上,最后推荐方案3(距堤600 m)为正式开采方案及提出综合防护措施,为解决类似工程,如南四湖、南水北调工程中线总干渠压煤开采等提供一定的借鉴。

Exploitation of mine resources will exert potential threats upon the safe operation of important hydraulic engineering projects in China.Based on practical projects and field monitoring curves of coal mining near an ore district,numerical simulation method is employed for the back analysis of mechanical parameters of rocks and soils in Yangcun Ore District.The impacts on the security of Xifeihe River left embankment under coal mining are evaluated with elastoplastic model,two-exponent rheological model and probability integral method.Based on current national regulations or codes and over 40-year practical mine experiences in China,the controlling indices and the reduction factor for deformation of Xifei River left embankment by coal mining are primarily presented.On the basis of above results,the proposed scheme 3（600 m far from embankment） is recommended for a formal mining scheme;and corresponding comprehensive protection measures are presented.It can offer a scientific basis and can be served as a reference to the similar projects,such as mining at Nansi Lake and mining at the major channels of Middle Route of South-to-North Water Transfer Project.