西周岭隧道地应力测量及岩爆预测分析.pdf

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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