淮北古近系“红层”工程地质特性及不良地质分区研究  

STUDY ON ENGINEERING GEOLOGICAL CHARACTERISTICS AND UNFAVORABLE GEOLOGY SUBAREA OF HUAIBEI PALEOGENE RED-BED

作　　者：程香港 何昭宇 刘梦楠 倪磊 乔伟[1] CHENG Xianggang;HE Zhaoyu;LIU Mengnan;NI Lei;QIAO Wei(China University of Mining and Technology,School of Resource and Geosciences,Xuzhou 221116,China;Shan Dong Construction Prospecting Collective Co.Ltd.,Ji nan 250031,China)

机构地区：[1]中国矿业大学,资源与地球科学学院,中国徐州221116 [2]山东建勘集团有限公司,中国济南250031

出　　处：《工程地质学报》2023年第1期228-239,共12页Journal of Engineering Geology

基　　金：国家自然科学基金(资助号:41772302);江苏高校优势学科建设工程项目;中国矿业大学未来杰出人才助力计划资助(资助号:2020WLJCRCZL088)。

摘　　要：我国“红层”分布广泛,“红层”成分复杂和结构特殊,极易诱发地质灾害。以淮北矿区信湖煤矿82采区为研究区,通过室内试验,从矿物成分、微观结构、物理力学特性和水理特性4个方面研究了淮北古近系“红层”工程地质特性,基于古近系“红层”工程地质特性,结合层次分析法,建立了“红层”潜在诱发灾害工程地质模型,提出了9个指标作为“红层”潜在诱发灾害的主要地质因素,对信湖煤矿82采区“红层”诱发矿井地质灾害进行了不良工程地质分区评价。研究结果表明:古近系“红层”以泥岩为主,抗压强度低,微观结构较差,稳定性差,含大量的亲水矿物,具有较强的亲水膨胀和崩解性。整体上,82采区范围内古近系“红层”覆岩结构相对稳定,“红层”诱发矿井地质灾害隐患易发生程度从西北至东南逐渐增加,其中:南部及东南部和采区范围内断层附近灾害隐患最强,西部局部地区较安全,中部及北部大部区域内较危险。“Red-bed” with complex composites and special structures, spreads widely in China and can induce geological hazards easily. This paper took the 82 mining area of Xinhu Coal Mine located in Huaibei, China as an example and studied the engineering geological characteristics induced by Huaibei Paleogene “red-bed”. First, based on in situ investigations, the vertical overlying deposition of red bed lithology was classified. Second, the rock core was adopted to study the basic properties of “red bed” rock in aspects of mineral composition, microstructure, physical-mechanical property and water-physical property by laboratory tests. Third, 9 representative influential factors which might induce hazards were raised based on experimental analysis and in situ conditions. An engineering model concerning geological hazards relevant to red-bed was built on the basis of Analytic Hierarchy Process(AHP). Finally, the unfavorable geology was analyzed according to potential geological hazards induced by“red-bed” in the 82 mining area. Results show that the “red-bed” is dominated by mudstone and has low compressive strength, poor microstructure and poor stability. Besides, the “red-bed” contains a lot of hydrophilic minerals and has strong swelling and disintegrating properties. As a whole, the strata structure of the “red-bed” in the 82 mining area is relatively stable. The degree of potential geological hazards induced by the “red-bed” increases gradually from northwest to southeast. Among them, the hazard possibility is greatest in south, southeast parts and areas near faults in mining. Some parts of west are safer and most parts of north are more dangerous. The study can provide useful references for engineering design and mining.

关 键 词：古近系“红层” 工程地质特性 不良工程地质分区 淮北矿区 

分 类 号：TD315[矿业工程—矿井建设]