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时间:2020-03-26
《西周岭隧道地应力测量及岩爆预测分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、JournalofEngineeringGeology工程地质学报1004-9665/2011/19(3)-0428—05西周岭隧道地应力测量及岩爆预测分析木刘军强(浙江省地球物理地球化学勘查院杭州310005)摘要为指导施工,提高施工的安全性和经济性,对西周岭隧道进行了钻孔水压致裂法地应力测量。测试结果表明:西周岭隧道深埋段地应力场以水平应力为主,在测试深度内最大水平主应力值为1O.57—19.39MPa,具中等偏高应力水平;最大水平主应力方向为近N33。W,与隧道走向的夹角较小,即地应力对隧道围
2、岩稳定性较为有利。基于地应力实测结果,本文采用Hock判据、Turchaninov判据、Russenes判据和工程岩体分级标准等4种判别方法进行岩爆预测,并分析了发生岩爆的临界深度,认为西周岭隧道深埋段有发生轻微~中等岩爆的可能,发生岩爆的临界埋深厚度约为397mo因此,在施工过程中应采取合理的开挖方式及防岩爆安全措施,防止岩爆灾害的发生。关键词西周岭隧道水压致裂法地应力测量岩爆中图分类号:TD311,TU459+.4文献标识码:AIN—SITUSTRESSMEASUREMENTANDRoCKBUR
3、STFORECASTANLYS-ISINXIZHoULINGTUNNELL1UJunqiang(ZhejiangGeophysicalandGeochemicalProspectingAcademy,Hangzhou310005)AbstractInordertoguideconstructionandimprovethesafetyandeconomyofcohstruction,hydro—fracturingstressmeasurementshavebeenconductedforXizho
4、ulingtunnelofZhejiangProvince.Itisfoundthatthemostim—portantstressdirectionisthehorizontaldirectioninthesurveyedarea.Withinthemeasureddepths,themaximumhorizontalstressisof10.57~19.39MPa.Thisstress1evelcanbeclassifiedasmiddletohighlevelinthisdeep.seated
5、tunne1.ThedominantdirectionofthemaximumhorizontalstressisaboutN33。W.Theanglebetweenthedi—rectionofthemaximumhorizontalstressandthedirectionofthetunnelaxisiSrelativelysmallforthistunne1.andfavorabletothestabilityofthetuflnelandthesurroundingrockmass.Bas
6、edonthein—situstressresultsandfourdistinguishedmethods(i.e.,Hockmethod,Turchaninovmethod,Russenesmethodandengineeringrockqualityclas-sificationstandard1rockburstsareforecastedduringtunnelconstructioninthedeep.seatedtunnelconditions.Thecriticalburieddep
7、thofrockburstisestimated.TheresultsshowthattherearehiIghpossibilitiesofoccurringweakandmoderaterockburstsinthistunne1.Thecriticalburieddepthofrockburstisabout397m.Inordertoavoidthedisadvantageconditions,reasonableexcavationmethodandsafetyprecautionssho
8、uldbeadoptedduringthetunnelconstruction.KeywordsXizhoulingtunnel,Hydro—fracturingmethod,In—situstressmeasurement,Rockburstforecast{收稿Et期:2010—10—25;收到修改稿日期:2011-02—25.作者简介:刘军强,主要从事岩土工程勘察、地质灾害防治工作.Email:hzjqliu@qq.cornl9(3)刘军强:西周岭隧道地应力测量
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