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1、第39卷第5期煤田地質(zhì)與勘探V_0l_39No.52011年10月CoALGE010GY&EXP10R0ct.2Ol1文章編號:1001-1986(2011)05-0035-06基于巖性一結構的煤層底板突水危險性評價孟召平,一,張貝貝,謝曉彤,申正偉,何方俊,潘之德(1.中國礦業(yè)大學煤炭資源與安全開采國家重點實驗室,地球科學與測繪工程學院,北京100083;2.三峽大學三峽庫區(qū)地質(zhì)災害教育部重點實驗室,湖北宜昌443002)摘要:煤層頂?shù)装逋凰kU性預測與評價是煤礦突水災害防治的基礎和依據(jù)。針對煤層底板隔水介質(zhì)條件,分析了煤系巖石力學性質(zhì),煤層
2、底板突水的巖性、結構和厚度特征,建立了煤層底板突水危險性評價理論和方法。研究表明:煤層底板隔水介質(zhì)條件取決于隔水層巖性和斷裂構造,隨著底板泥巖含量增加,煤層底板隔水性能增高,但抗水壓能力降低;隨著斷裂發(fā)育程度的增加,底板隔水層由完整結構、塊裂結構到碎裂結構和松散結構,煤層底板抗水壓能力和隔水性能均降低。突水危險性增大。煤層底板抗水壓能力與煤層底板隔水層厚度密切相關,統(tǒng)計表明,煤層底板受的極限水壓P與底板隔水層厚度h之間為2次冪函數(shù)關系。在傳統(tǒng)突水系數(shù)的基礎上考慮了隔水層的巖性和結構特征,提出了煤層底板突水危險評價分類;進一步根據(jù)水壓P與巖體破裂
3、壓力關系和水壓與最小主應力i關系判斷是否突水。關鍵詞:煤層底板;巖性一結構;突水危險性中圖分類號:TD741文獻標識碼:ADOI:10.3969/j.issn.1001—1986.2011.05.009Evaluationofwaterinrushriskofseamfloorbasedonlithology-structureMENGZhaoping,ZHANGBeibei,XIEXiaotong,SHENZhengwei,HEFangjun,PANZhide(1.StateKeyLaboratoryofCoalResourcesandSaf
4、eMining,CollegeofGeosciencesandSurveyingEngineering,ChinaUniversityofMiningandTechnology,Beijing100083,China;2.KeyLaboratoryofGeologicalHazardsonThreeGorgesReservoirArea,MinistryofEducation,ChinaThreeGorgesUniversity,Iqchang443002,China)Abstract:Waterinrushriskpredictionande
5、valuationofseamroofandfloorarethefoundationofwaterinrushdisasterspreventionincoalmines.Accordingtothewaterproofmediumconditionsofseamfloor,themechanicalpropertiesofcoal·measurerockandthelithology,structureandthicknessofseamfloorwereanalyzed,thetheoryandmethodsofwaterinrushri
6、skevaluationofseamfloorwerefounded.Itisshownthatthewaterproofmediumconditionsofseamfloordependonthelithlogyofaquifugeandthestructure.Waterisolatingofseamfloorbe—comesbetterwiththeincreaseofshalepercentagecontent,buttheabilityofresistingwaterpressurewasreduced.Theaquifugeofse
7、amfloorchangesfromcompletestructureandblockstructuretocataclasticstructureandloosestructurewiththeincreaseofthefaultdevelopment.Theabilityofresistingwaterpressureandwaterisolatingoftheseamfloordecrease,andthewaterinrushriskincreases.Theabilityofresistingwaterpressureofseamfl
8、oorandthethicknessoftheaquifugeofseamfloorarecloselyrelated.Statisticalanal