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岩盐溶腔稳定性及失稳控制研究 【作者】姜德义 【导师】鲜学福

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盐溶稳定性失稳控制研究

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i luW+_0作者姜德义导师】鲜学福水利论文L%u.g-r+{%r7D W
【作者基本信息】重庆大学,采矿工程,2001年,博士水利论文w5B;sV5h]D[}}

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t| Q#N Z,GiR;fH0【中文摘要】 本文针对岩盐钻井水溶开采溶腔稳定性问题进行了详细研究,用三维有限元法分析了地应力场对溶腔稳定性的影响,用相似材料模拟试验研究了溶腔失稳的发生发展过程及围岩应力分布规律,用FLAC分析了溶腔的大变形问题,同时,将突变理论应用于溶腔稳定性分析,获得了符合现场实际的突变模型。用3D-Sigma有限元数值分析计算程序,分析了不同采深、单溶腔开采和双溶腔开采时岩盐溶腔围岩的地应力场分布规律,获得了溶腔围岩中主应力场的分布规律,研究了溶腔内水压和双溶腔开采时溶腔顶板跨度对围岩应力场分布的影响。 相似材料模拟实验能定性反映溶腔顶板破坏的发生发展过程。随着采深和溶腔跨距的增加,溶腔围岩的压力峰值的大小及峰值点距溶腔边缘的距离也在不断增加,而溶腔的极限跨距则减小。当溶腔超过极限跨距,顶板垮塌后,溶腔上覆岩层将显现明显的冒落带、裂隙带和弯曲下沉带。对于岩盐溶腔这种特殊的地下工程结构和围岩条件,溶腔围岩具有典型的非线性大变形特征,这些力学特征用常规的数值方法很难分析。本文采用的拉格朗日元法(FLAC)很好地解决了这一问题,使相关的水压作用、大变形以及溶腔的动态侧切过程等力学响应得到了合理的模拟与分析。采用固...更多支大变形圆板突变模型研究了单井溶腔顶板的稳定性,得出了溶腔顶板岩层失稳的必要条件。用平直梁尖点突变模型,并考虑了自重侧压压力及水平构造应力的综合作用力研究了连通井顶板的失稳突跳,得出了连通井顶板失稳的充要条件。采用固支梁-矿柱模型,研究了井组间矿柱的稳定性并分析了矿柱突跳失稳的释能机制。地应力场的大小与方向,对溶腔稳定性影响较大。在连通井组开采,特别是水力压裂连通井组开采中,两井的连线最好与最大主应力方向一致。这样既有利于水力压裂裂隙的发展,也有利于连通后井组开采溶腔的稳定性。岩盐开采后,溶腔内的水压力使溶腔围岩处于三向受力状态,同时水压对顶板也起到了很好的支撑作用。在一定范围内,溶腔内水压越高,溶腔越稳定。同时渗透水对顶板岩层的强度及稳定性的影响很大,因此,在开采时应尽量避免水渗透到顶板岩层,应留一定厚度的岩盐层保护顶板。  还原水利论文;t6B#}!o3n;r5h bAws

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【英文摘要】 In this paper a systematic research on stability of rock salt cavern in solution mining has been done. The effect on cavern stability by in-situ stress has been analyzed with FEM. The development of cavern destabilization and the stress distribution in surrounding rock are approached by model test on equivalent materials. The large deformation of cavern is studied by FLAC, and meantime, a catastrophic theory is applied to cavern stability analysis, and the cusps model is established.The in-situ stress distribution in surrounding rock of cavern with single and double cavern is analyzed using 3D-Sigma in different depth of mining. The effect of the span of cavern, and the water pressure in cavern on stress in surrounding rock is also studied.The tests on equivalent materials show the developing progress of destabilization in cavern. With the increase of depth and span of cavern, while the peak of stress in surrounding rock and the distance from boundary of cavern increase, the maximum sp...更多an of cavern declines. When the roof of cavern collapse, there are collapse zone, fracturing zone and bending zone in the upper strata of cavern.The surrounding rock of cavern shows a typical characteristic of large deformation. This characteristic is difficult to be analyzed by the normal method. However with FLAC this problem can be solved. In addition, mechanical reaction on water pressure, large deformation and the dynamical cutting progress can also be analyzed.The stability of single cavern roof is studied by cusp catastrophe model of large deformation circular plate. Thus the necessary condition of destabilization is obtained. The cusp catastrophe of connected well roof is analyzed by beam model considering the level stress contributed by the weight of strata and geological construction. The stability and the mutation mechanism of pillar between two wells are discussed by beam-pillar cusp <WP=8>catastrophe model. The direction and magnitude of in-situ stress greatly affect the stability of cavern. In the double well excavation, especially in hydraulic fracturing connected double well excavation, the line between two well had better be run parallel with the direction of maximum stress. Which is good both for hydraulic fracturing connect and for the stability of caverns.The water pressure in cavern makes the surrounding rock in three-dimensional pressure state, and it is also a good supporter of cavern roof. The higher the pressure in the cavern is, the more stable the cavern. Besides, the water permeated from roof will great affect the strength and stability of cavern. Therefore, keeping a layer of salt to the roof is a good way to prevent water permeation.  还原

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【中文关键词】 岩盐溶腔稳定性; 非线形大变形; 相似模拟; 突变模型; 失稳控制水利论文&FTix8gb}
【英文关键词】 Rock salt; cavern; stability; non-linear; large deformation; test on equivalent materials; cusp catastrophe model; destabilization control.

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TAG: 导师 姜德义 失稳 稳定性 盐溶
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