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联系铜川8个古滑坡复活的实例,论证了川口滑坡复活的基本因素和诱发因素,滑坡的机理,铜川古滑坡复活的成因和规律;以及防滑对策。 相似文献
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侯月线芦苇河 1#桥月山端一侧路堑开挖后 ,发生滑塌 ,经地质调查勘探查明这是一个典型的石质古滑坡复活。从勘察入手 ,揭示该古滑坡复活的原因 相似文献
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通过地质详勘,对古滑坡的原因进行准确判断,并对抗滑桩和挡土墙方案进行比较。提出了复活后的古滑坡采用挡土墙、滑坡前缘反压等合理、简易、经济的治理方案。治理后几年的通车营运,滑坡是稳定的,表明滑坡治理的前期工作做的细,其效果是事半功倍的。 相似文献
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本文以Ⅲ号滑坡为例,论述了武都西山古滑坡群复活特征,针对滑坡形成的机制及危害方式,采用支挡与截、排水综合整治方案,效果显著,可供类似情况下整治滑坡的参考。 相似文献
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介绍古田隧道在施工过程中发生的山体古滑坡复活情况,分析了其形成原因及相应的处理措施。着重阐述了微型钢筋锚固桩的施工工艺,为以后的同类型工程提供借鉴。 相似文献
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本文主要讨论公司内部审计和公司治理的关系及其在完善公司治理结构中的作用。通过分析我国现阶段公司治理结构中存在的问题和公司内部审计的现状,提出加强内部审计,促进公司治理结构完善的建议。 相似文献
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T.N. Croft M. Cross A.K. Slone A.J. Williams C.R. Bennett P. Blot M. Bannear R. Jones 《Minerals Engineering》2009,22(9-10):859-873
During the re-configuration of their grate-kiln induration system for the firing of iron ore pellets at the Whyalla Steelworks, caused by a change from an earthy hematite to a magnetite ore with considerably less flux, OneSteel commissioned a detailed thermal flow analysis of the design options on the existing cooler in support of the process change. A key objective of this investigation was to decide if and where one might locate baffle walls within the cooler to improve the process and to control the off-gas flows to earlier stages within the process.The thermo-fluid analysis comprised the development of comprehensive three dimensional computational models of gas flow through the cooler coupled with the heat transport and exchange with the cooling pellet bed. The models were implemented within the context of an open source – object based computational fluid dynamics (CFD) simulation software framework. This paper describes the development of the CFD model, its verification and application to evaluating design options to improve the flow control within the cooler. In particular, the analysis considers the role and potential location of above bed baffle walls, cooler stack butterfly lid opening and its exhaust pressure on the flow distribution to the exit flow ducts from the cooler. 相似文献
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This paper deals with the optimization of an autogenous grinding circuit using a random search technique. This technique is based on a hierarchical structure of learning automata operating in a random environment constituted by the autogenous circuit to be optimized. The ore feed rate to the mill is considered as the control variable while the mass flow rate of the concentrate of the subsequent separation process constitutes the controlled variable.The variation domain of the manipulated variables is discretized into a set of regions which are associated to the actions of the automata of the last level of the hierarchical learning system. A probability is associated to each action (region). The learning system selects one of the available actions and, based on the response of the environment, modifies the strategy (the probabilities associated to the set of actions) using an adaptation procedure called reinforcement scheme.Numerical results illustrate the feasibility and the performance of this self-adjusting optimization algorithm. 相似文献
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针对焦化废水成分复杂、难降解等特点,对某化工厂焦化废水采用预处理并结合组合膜工艺进行深度处理,通过测定各工艺出水COD、总硬度、总碱度、电导率、浊度和pH值等指标,探究该改进膜法深度处理工艺对焦化废水的处理效果。结果表明,该膜法深度处理工艺对COD的去除率为99.8%,对总硬度的去除率约为99.5%,对总碱度的去除率达到99.1%~99.5%,对浊度的去除率达到100%,电导率下降99.7%。经改进膜法深度处理工艺处理后,出水COD、总硬度、总碱度、电导率和浊度等满足循环水水质标准和除盐水水质标准,pH值较标准偏低。超滤对浊度去除效果显著,对COD、总碱度、总硬度的去除和电导率降低效果不好,纳滤对COD、总碱度、总硬度的去除和电导率降低均有一定效果但均弱于反渗透。 相似文献
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《International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts》1993,30(1):37-46
A solution is obtained for predicting tunnel water inflows for the commonly observed case of an exponential decrease of hydraulic conductivity with depth. The analytical solution is applicable to the prediction of ubiquitous inflows from a jointed rock mass, and the risk of major isolated inflows from singular conductors such as faults must be separately evaluated.The predictions are verified by finite-element modelling and compared with published inflows for tunnels in a variety of rock conditions. The new solution predicts the commonly observed trend that inflows at first increase then decrease as a tunnel goes deeper, rather than continue to increase as predicted by Goodman's solution where the hydraulic conductivity is assumed constant. Goodman's solution can underestimated inflow by 30% or overestimate it by an order of magnitude, depending on the depth at which hydraulic conductivity is measured.Upper and lower bound predictions corresponding to extreme values of stress-independent factors such as an increase of joint spacing with depth are examined for a range of typical tunnel characteristics. The differences are found to be insignificant when the hydraulic conductivity gradient A is small, but increase to 30% A = 0.01. An]estimate mid-way between upper an lower bound values gives a maximum prediction error of about ±15% which is likely to be adequate in most practical applications.The analytical and finite element models of both predict that inflows are insensitive to tunnel diameter (maximum 2% increase in flowrate per metre increase in diameter). This agrees with the observation that inflows during the driving of a full-bore tunnel can be similar to those from a pilot tunnel or exploratory drillhole ahead of the face. 相似文献
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