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西尔瓜子古滑坡新活动区是由一个大型古滑坡堆积体局部复活而成,毛尔盖水电站水库二期蓄水位达到2085 m高程左右时,滑坡体前缘部分发生较大规模的垮塌,该滑坡若产生速滑,将威胁附近新建麻窝移民集镇和斜坡内省道贝尔隧道安全,甚至给毛尔盖水电站大坝造成影响。在查明该滑坡地质环境条件、斜坡地质结构、变形滑动现象与特征和变形滑动模式基础上,采用有限元分析软件FLAC3D,基于流固耦合分析原理,建立地质结构模型,研究了该滑坡在库水作用下的变形过程及机制,确定了该滑坡滑动的临界库水位,并利用极限平衡分析方法就稳定现状和发展趋势进行了评价预测。结果表明,滑坡进一步滑动的临界库水位在2 105 m时,滑坡整体处于失稳状态。必须采取加固措施,确保工程和人民的安全。 相似文献
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In the geostress measurement for Niba Mountain on Ya'an-Lugu Expressway, results of Kaiser effect tests combined with focal mechanism solution were compared with those obtained by hydraulic fracturing method, both of which are basically coincident. It is shown that the principal stress increases with burial depth; the maximum principal stress is about 45 MPa, which is larger near fault zones because of stress concentration, and its direction ranges from N20°W to N75°W. 相似文献
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碾压混凝土力学特性及本构模型研究 总被引:3,自引:0,他引:3
邓荣贵 《西南交通大学学报》2002,37(1):19-25
为了解岷江流域某高拱坝坝体碾压混凝土的力学特性,对取自该坝体的碾压混凝土试样,进行了常规三轴压缩和直接剪切全过程试验。根据试验资料,对碾压混凝土在常规三轴压缩和直接剪切作用下的变形、强度、破裂特性及其本构特性进行了详细分析。结果显示,碾压混凝土在三轴压缩下的切线模量较大,而抗压强度相对较小;三轴压缩下的抗剪强度参数与直接剪切下的抗剪强度参数的差值较小。 相似文献
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Stability of High Slope Interbedded Strata with Low Dip Angle Constituted by Soft and Hard Rock Mass
Slopes consisting of interbedded strata of soft and hard rock mass,such as purplish red mudstone and grey-brow arkosic sandstone of Jurassic age,are very common in Sichuan basin of China.The mudstone is soft while the sandstone is hard and contains many opening or closing joints with a high dip angle.Some are nearly parallel and the others are nearly decussated with the trend of the slopes.Many natural slopes are in deformation or sliding because of those reasons.The stability of cutting slopes and supporting method to be taken for their stability in civil engineering are important.in this paper,the stability and deformation of the slopes are studied.The methods of analysis and support design principle are analyzed also.Finally,the method put forward is applied to study Fengdian high cutting slope in Sichuan section of the express way from Chengdu to Shanghai.The results indicate that the method is effective. 相似文献
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