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参数敏感性分析与试验方案优化 总被引：20，自引：2，他引：20
在单因素敏感性分析的基础上,定义了无量纲形式的敏感度函数和敏感度因子,使得多因素敏感性分析具有可比性。作为算例,对拉西瓦地下工程的稳定性进行了敏感性分析。结果表明,水平向地应力σ_x和岩体弹性模量E是影响地下主厂房高边墙水平向变形的敏感因素。分析还表明,敏感因素与基准参数集有关,基准参数集不同,结论将有差异。本文还提出了试验方案优化的概念,并指出参数敏感性分析是试验方案优化的基础。 相似文献
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二滩电站坝肩厂房三维有限元分析及围岩变形观测反分析 总被引：8，自引：2，他引：6
本文首先用应力函数法对二滩电站地下厂房区的着干地应力实测点进行拟合,给出了三维连续初始应力场。然后对三个大型洞室形成的厂房群进行三维有限元分析,得出了洞群围岩中破损区、应力弱化区及高应力区的分布,并就三维分析与二维分析的结果进行了对比。可以认为,二维分析不一定比三维分析更安全,因为三维分析得出的拉破裂范围更大些。文中还提出了一个用弹性有限元分析近似推求裂隙围岩破裂范围的方法。最后介绍在该现场的一个试验洞中进行围岩变形观测及反分析的结果,该反分析较好的验证了围岩力学参数及地应力测量的结果。 相似文献
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在FLAC-3D软件平台上,开发出岩石破裂过程的渗流-损伤耦合分析程序,对渗流-损伤耦合作用下岩石的裂纹萌生、扩展过程进行模拟研究。分析了在孔隙水压力作用下,含原生裂隙和弱化单元的非均质试件在单轴、三轴加载下的破坏过程,并与非渗流条件下试件在单轴、三轴压缩下的破坏过程相对比,通过动态显示损伤状态、渗流场,并分析应力应变关系、位移图等,对渗流影响下裂隙岩体的损伤和渐进破裂过程进行了研究。 相似文献
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The Vertical displacements on the crown during excavation is monitored with WRM-3 type extensometer. Successful prediction of extensive coupes in a shallow buried loess tunnel with a large span is made. The emphasis of this paper is put on the interpretation of the whole measuring process at borehole 2. The relations between displacement and excavation of the tunnel, relative displacements in the ground and the surface subsidence are discussed tentatively. The results indicate that monitoring vertical displacements under this engineering condition is very important to ensure the stability and safe excavation of the tunnel. Finally, some conclusions are drawn that the largest vertical displacement during the excavation of top part (about 1/3 height ) of the tunnel occurred when the working surface was in the distance of 1.2 tunnel diameters from the measuring hole and that the change of vertical displacements was small during the excavation of the low part, which was equal to 30—40% of the largest one. 相似文献
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Summary The large underground power chambers of Ertan Hydropower Station will be built near the abutment on the left bank in a region with high initial stresses. In this paper, a statistical analysis is presented for the phenomenon of core disking in the dam site. On the basis of a number of stress measurements, the region of the river valley could be divided into three different geostress zones. It is shown that there exists a rather high horizontal stress of up to 30 MPa, and even over 60 MPa at the bottom of the river bed. A least square method has been introduced to get a continuous field of stress, which approximates the variable measured stress data. 相似文献
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单纯形法及其在广蓄电站转岩变形反分析中的应用 总被引：1，自引：1，他引：0
Surrounding rocks of GPSH ( Guangzhou Pumped Storage Hydroplant) are treated as isotropic medium or orthotropic jointed rocks. Directed back analyses of measured displacements from observation section in access gallery and exhaust gallery of main transformer house are made by simplex acceleration method. A number of mechanical parameters of rock mass and in-situ ground stresses are obtained and compared with measured data. 相似文献
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巷道围岩参数的人工神经网络预测 总被引：7，自引：0，他引：7
应用人工智能方法解决地下工程问题,提出了预测巷道围岩参数的人工神经网络预测法,构造了预测围岩参数的神经网络模型。预测结果证明,该模型具有很高的预测精度。提出的方法有一定的实用价值和参考价值。 相似文献
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