岩质边坡锚固工程时变可靠性分析模型及可靠度计算方法
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摘要
近年来,随着西部重大水电项目的开展建设,对于岩质边坡的稳定性分析和加固措施的研究越来越受到重视。锚杆加固具有经济、方便、快捷和便于施工等优点,因此锚固边坡可靠性分析与评价必然受到了人们越来越多的关注和重视。为此,本文结合国家自然科学基金(50878082)和湖南省自然科学基金重点项目(09JJ3104),通过理论分析和数值模拟,系统地分析了岩质边坡各种破坏类型下锚固系统的时变可靠度,主要研究工作和成果如下：
(1)考虑锚杆多失效模式,以及岩土体强度、锚杆强度和锚固力参数的时变性,建立了单滑块型岩质边坡锚固系统时变可靠度分析模型。基于Monte-Carlo随机抽样法,提出该类边坡锚固系统时变破坏概率的直接求解方法。分析锚杆不同破坏模式的抗力时变性和滑动面上抗剪强度参数的时变性对锚固系统破坏概率的影响,并与普通响应面法、加权相应面法结合JC法求出各自的破坏概率及可靠指标进行比较分析；
(2)考虑主控软弱面上抗剪强度因降雨长时间浸泡而引起的时变性,锚杆多失效模式及其抗力时变性,建立双滑块型岩质边坡锚固系统时变可靠度分析模型。分析在不考虑锚杆对滑动面上强度参数影响的情况下,锚固系统各强度参数的时变性对被动滑块最危险滑裂面倾角和最优锚固角计算结果的影响。最后与普通响应面法、加权相应面法结合JC法求出锚固的破坏概率进行详细的比较分析；
(3)考虑锚杆多种失效模式、锚杆腐蚀和滑动面上抗剪强度参数因干湿循环而引起的时变性,建立楔形体滑动型岩质边坡锚固系统时变可靠度分析模型。分析锚杆在不同服役期间、不同受荷情况、不同腐蚀溶液浓度下,锚杆腐蚀对该类边坡锚固系统时变破坏概率的影响；最后分析干湿循环因岩土体初始含水量的不同而对锚固系统破坏概率的影响。
In recent years, With the launching of the western construction of major hydropower projects, more importance has been attached to the stability analysis of high rock slope and the research of reinforcement measures. The anchor rod has the advantage such as cheap, convenient, fast, easy to construct and so on. As a consequence, more concern and attention will be paid to the reliability analysis and evaluation of anchored slope.Therefore, this paper combines theNational Natural Science Foundation (50878082) and Natural Science Foundation of Hunan Province (09JJ3104), to make a systematic analysis of the various failure modes of rock slope under the Time Dependent Anchoring System through theoretical analysis and numerical simulation.Main research achievements are as follows:
(1) Based on Multi-failure models and resistance time-varying of every failure models, shear strength parameters time-varying caused by creep, rock slope single slider sliding anchoring system reliability analysis model is established. Based on Monte-Carlo sampling method, a method to solve failure probability of such slope anchoring system time-varying directly is proposed. Results show that, resistance time-varying of different bolt failure modes and strength parameters time-varying of sliding surface have great impact on anchorage system failure probability. A comparation is made among the ordinary least squares, weighted least squares method with JC method and Monte-Carlo sampling method;
(2) Based on Multi-failure models of bolt and resistance time-varying, shear strength time-varying caused by rainfall and a long soak time variability on master weak surface, rock slope dual slider sliding anchoring system reliability analysis model is established.Results show that, without considering the bolt impact on the sliding surface strength parameters.strength parameters time-varying of anchoring system basically have no impact on most critical slip surface inclination of passive slide and best anchor point search results. A comparation is made among the ordinary least squares, weighted least squares method with JC method and Monte-Carlo sampling method;
(3) While considering the various failure modes of anchor, corrosion bolt and shear strength parameters time-varying of the sliding surface caused by wet and dry cycles, anchor system time-varying reliability analysis model of rock slope wedge slid is established.Results show that, bolt under different service, loaded conditions, concentrations of corrosion solution; Anchor bolt corrosion has an different impact on time-varying failure probability of that type of slope anchor system; So does wetting and drying cycles (due to the different initial moisture content in rock and soil).
(1)考虑锚杆多失效模式,以及岩土体强度、锚杆强度和锚固力参数的时变性,建立了单滑块型岩质边坡锚固系统时变可靠度分析模型。基于Monte-Carlo随机抽样法,提出该类边坡锚固系统时变破坏概率的直接求解方法。分析锚杆不同破坏模式的抗力时变性和滑动面上抗剪强度参数的时变性对锚固系统破坏概率的影响,并与普通响应面法、加权相应面法结合JC法求出各自的破坏概率及可靠指标进行比较分析；
(2)考虑主控软弱面上抗剪强度因降雨长时间浸泡而引起的时变性,锚杆多失效模式及其抗力时变性,建立双滑块型岩质边坡锚固系统时变可靠度分析模型。分析在不考虑锚杆对滑动面上强度参数影响的情况下,锚固系统各强度参数的时变性对被动滑块最危险滑裂面倾角和最优锚固角计算结果的影响。最后与普通响应面法、加权相应面法结合JC法求出锚固的破坏概率进行详细的比较分析；
(3)考虑锚杆多种失效模式、锚杆腐蚀和滑动面上抗剪强度参数因干湿循环而引起的时变性,建立楔形体滑动型岩质边坡锚固系统时变可靠度分析模型。分析锚杆在不同服役期间、不同受荷情况、不同腐蚀溶液浓度下,锚杆腐蚀对该类边坡锚固系统时变破坏概率的影响；最后分析干湿循环因岩土体初始含水量的不同而对锚固系统破坏概率的影响。
In recent years, With the launching of the western construction of major hydropower projects, more importance has been attached to the stability analysis of high rock slope and the research of reinforcement measures. The anchor rod has the advantage such as cheap, convenient, fast, easy to construct and so on. As a consequence, more concern and attention will be paid to the reliability analysis and evaluation of anchored slope.Therefore, this paper combines theNational Natural Science Foundation (50878082) and Natural Science Foundation of Hunan Province (09JJ3104), to make a systematic analysis of the various failure modes of rock slope under the Time Dependent Anchoring System through theoretical analysis and numerical simulation.Main research achievements are as follows:
(1) Based on Multi-failure models and resistance time-varying of every failure models, shear strength parameters time-varying caused by creep, rock slope single slider sliding anchoring system reliability analysis model is established. Based on Monte-Carlo sampling method, a method to solve failure probability of such slope anchoring system time-varying directly is proposed. Results show that, resistance time-varying of different bolt failure modes and strength parameters time-varying of sliding surface have great impact on anchorage system failure probability. A comparation is made among the ordinary least squares, weighted least squares method with JC method and Monte-Carlo sampling method;
(2) Based on Multi-failure models of bolt and resistance time-varying, shear strength time-varying caused by rainfall and a long soak time variability on master weak surface, rock slope dual slider sliding anchoring system reliability analysis model is established.Results show that, without considering the bolt impact on the sliding surface strength parameters.strength parameters time-varying of anchoring system basically have no impact on most critical slip surface inclination of passive slide and best anchor point search results. A comparation is made among the ordinary least squares, weighted least squares method with JC method and Monte-Carlo sampling method;
(3) While considering the various failure modes of anchor, corrosion bolt and shear strength parameters time-varying of the sliding surface caused by wet and dry cycles, anchor system time-varying reliability analysis model of rock slope wedge slid is established.Results show that, bolt under different service, loaded conditions, concentrations of corrosion solution; Anchor bolt corrosion has an different impact on time-varying failure probability of that type of slope anchor system; So does wetting and drying cycles (due to the different initial moisture content in rock and soil).
引文
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