龙背湾低导流洞进口边坡变形稳定分析及加固处理
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摘要
利用勘测的龙背湾水电站低导流洞进口边坡表层岩体参数,分析自然边坡的安全状态,修正边坡表层岩体的强度参数,并进行初始应力场计算。采用多节理本构模型,对边坡开挖时出现的卸荷裂缝处的岩体进行模拟,并分析裂缝的成因。对初步的加固措施进行模拟,分析开挖过程中,边坡的变形、稳定情况,并在此基础上,对原加固方案进行修改和补充,结合边坡的水位骤降工况,分析边坡的变形稳定情况。研究结果表明:加固措施具有可行性和有效性,为边坡的开挖、加固提供了理论依据。
Using the investigated rock parameters of Longbeiwan low diversion tunnel entrance slope,the status quo of the slope was analyzed.The rock strength parameters of the slope surface were modified and the initial stress field was calculated.Multi-joint model was used to simulate the unloading cracks during the excavation,and the causes were analyzed.The original reinforcement measures were simulated,and then,the deformation and stability situation during the excavation were analyzed.On the basis of these,reinforcement measures were modified and enhanced,and deformation and stability were analyzed when the slope is being suffered by a rapid drawdown of water level.The results show that the reinforcement measures are feasible and effective,which can provide theoretical support to the excavation and reinforcement of the slope.
Using the investigated rock parameters of Longbeiwan low diversion tunnel entrance slope,the status quo of the slope was analyzed.The rock strength parameters of the slope surface were modified and the initial stress field was calculated.Multi-joint model was used to simulate the unloading cracks during the excavation,and the causes were analyzed.The original reinforcement measures were simulated,and then,the deformation and stability situation during the excavation were analyzed.On the basis of these,reinforcement measures were modified and enhanced,and deformation and stability were analyzed when the slope is being suffered by a rapid drawdown of water level.The results show that the reinforcement measures are feasible and effective,which can provide theoretical support to the excavation and reinforcement of the slope.
引文
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[2]Phoon K K,Kulhawy F H.Evaluation of geotechnical propertyvariability[J].Canadian Geotechnical Journal,1999,36:625-639.
[3]张征,刘淑春,鞠硕华.岩土参数空间变异性分析原理与最优估计模型[J].岩土工程学报,1996,18(4):40-47.ZHANG Zheng,LIU Shuchun,JU Shuohua.The optimumestimation model and the principle of spatial variability analysisof rock and soil parameters[J].Chinese Journal of geotechnicalEngineering,1996,18(4):40-47.
[4]周创兵,陈益峰,姜清辉,等.论岩体多场广义耦合及其工程应用[J].岩石力学与下程学报,2008,27(7):1329-1340.ZHOU Chuangbing,CHEN Yifeng,JIANG Qinghui,et al.Ongeneralized multi-field coupling for fractured rock masses and itsapplications to rock engineering[J].Chinese Journal of HydraulicEngineering,2008,27(7):1329-1340.
[5]Fox D M,Bryan R B,Price A B.The influence of slope angle onfinal infiltration rate for interrill condition[J].Geoderma,1997,80:181-194.
[6]Berilgen M M.Investigation of stability of slopes underdrawdown conditions[J].Computers and Geotechnics,2007,34:81-91.
[7]刘杰,李建林,张玉灯,等.基于拟静力法的大岗山坝肩边坡地震工况稳定性分析[J].岩石力学与工程学报,2009,28(8):1562-1570.LIU Jie,LI Jianlin,ZHANG Yudeng,et al.Stability analysis ofdagangshan dam abutment slope earthquake based onpseudo-static method[J].Chinese Journal of Rock Mechanicsand Engineering,2009,28(8):1562-1570.
[8]李宁,尹森菁.边坡安全监测的仿真反分析[J].岩石力学与下程学报,1996,15(1):9-18.LI Ning,YIN Senqing.Back analysis of the safety factor forslope[J].Chinese Journal of Hydraulic Engineering,1996,15(1):9-18.
[9]许宝田,钱七虎,阎长虹,等.多层软弱夹层边坡岩体稳定性及加固分析[J].岩石力学与工程学报,2009,28(s2):3959-3964.XU Baotian,QIAN Qihu,YAN Changhong,et al.Stability andstrengthening analysis of slope rock mass containing multi-weakinterlayers[J].Chinese Journal of Rock Mechanics andEngineering,2009s,28(s2):3959-3964.
[10]沈金瑞,林杭.多组节理边坡稳定性FLAC3D数值分析[J].中国安全科学学报,2007,17(1):29-33.SHEN Jinrui,LIN Hang.The numerical analysis on the stabilityof slope with several sets of joints by FLAC3D[J].China SafetyScience Journal,2007,17(1):29-33.
[11]朱泽奇,盛谦,梅松华,等.改进的遍布节理模型及其在层状岩体地下工程中的应用[J].岩土力学,2009,30(10):3115-3122.ZHU Zeqi,SHENG Qian,MEI Songhua,et al.Improvedubiquitous-joint model and its application to undergroundengineering in layered rock masses[J].Rock and Soil Mechanics,2009,30(10):3115-3122.
[12]贾官伟,詹良通,陈云敏.水位骤降对边坡稳定性影响的模型试验研究[J].岩石力学与工程学报,2009,28(9):1798-1803.JIA Guanwei,ZHAN Liangtong,CHEN Yunmin.Model teststudy of slope instability induced by rapid drawdown of waterlevel[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(9):1798-1803.
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