高速铁路技术
高速鐵路技術
고속철로기술
HIGH SPEED RAILWAY TECHNOLOGY
2013年
3期
89-92
,共4页
客运专线%水压致裂%地应力测量%应力状态%工程应用
客運專線%水壓緻裂%地應力測量%應力狀態%工程應用
객운전선%수압치렬%지응력측량%응력상태%공정응용
passenger dedicated line%hydrolic fracture%in-situ stress measurement%stress state%application in engi-neering
基于报信山隧道水压致裂地应力量测结果，分析了隧道区地应力特征、最大主应力方向；结合最大主应力大小及方向分析不同隧道轴线方位的围岩稳定性，为隧道轴线方位、隧道断面形状的选择提供可靠的科学依据。通过隧道区应力特征分析，确定隧道区以水平应力为主，最大水平主应力量值为12 MPa，最大主应力方向为NW向。根据最大主应力方向，线路方案局部优化，舍弃老屯设站方案；最大主应力方向与隧道轴线方向基本垂直，对隧道洞室稳定性不利，但隧道断面采取1∶1.2的椭圆形开挖形状，可弥补隧道走向对洞室围岩稳定所带来的不利因素；结合隧道区工程地质条件，认为发生岩爆等地质灾害的概率很小。
基于報信山隧道水壓緻裂地應力量測結果，分析瞭隧道區地應力特徵、最大主應力方嚮；結閤最大主應力大小及方嚮分析不同隧道軸線方位的圍巖穩定性，為隧道軸線方位、隧道斷麵形狀的選擇提供可靠的科學依據。通過隧道區應力特徵分析，確定隧道區以水平應力為主，最大水平主應力量值為12 MPa，最大主應力方嚮為NW嚮。根據最大主應力方嚮，線路方案跼部優化，捨棄老屯設站方案；最大主應力方嚮與隧道軸線方嚮基本垂直，對隧道洞室穩定性不利，但隧道斷麵採取1∶1.2的橢圓形開挖形狀，可瀰補隧道走嚮對洞室圍巖穩定所帶來的不利因素；結閤隧道區工程地質條件，認為髮生巖爆等地質災害的概率很小。
기우보신산수도수압치렬지응역량측결과，분석료수도구지응력특정、최대주응력방향；결합최대주응력대소급방향분석불동수도축선방위적위암은정성，위수도축선방위、수도단면형상적선택제공가고적과학의거。통과수도구응력특정분석，학정수도구이수평응력위주，최대수평주응역량치위12 MPa，최대주응력방향위NW향。근거최대주응력방향，선로방안국부우화，사기로둔설참방안；최대주응력방향여수도축선방향기본수직，대수도동실은정성불리，단수도단면채취1∶1.2적타원형개알형상，가미보수도주향대동실위암은정소대래적불리인소；결합수도구공정지질조건，인위발생암폭등지질재해적개솔흔소。
Based on the measurement of geostatic stress caused by hydraulic fracture in Baoxinshan-tunnel,the stress characteristics in tunnel area and the direction of maximum principal stress is discussed.Combined with the geostatic stress value in tunnel area and the direction of maximum principal stress,the stability of the tunnel surrounding rock is analyzed.The reliable scientific basis is provided for the determination of direction of the tunnel axis and the choice of tunnel cross-section form.Through analysis of the stress characteristics in tunnel area,horizontal stress is confirmed as the maximum principal stress which has a value of 12 MPa and has NW direction as its maximum principal stress direc-tion.On the basis of this result,the line scheme is optimized by abandoning Laotung station scheme.The maximum principal stress direction and the direction of tunnel axis are substantially perpendicular,unfavorable for tunnel stability, but the cross section of the tunnel is excavated in 1∶1.2 oval shape,which makes up the unfavorable factors on cavern surrounding rock stability caused by tunnel direction;Under such a geology condition in the tunneling,geological disas-ters like rock burst are minimized.
