利用测井资料识别碳酸盐岩裂缝的方法

在碳酸盐岩地层中,裂缝是非常常见且十分重要的一类储集空间类型,对油气的运移和聚集有非常重要的作用。因此,裂缝的识别显得特别重要。本文以新疆某油田为例,通过岩芯观察及成像测井资料与常规测井资料进行比对,总结出了不同类型裂缝对常规测井的不同响应特征。通过实际应用,识别效果良好,证明用测井方法识别不同类型的裂缝是可行的。     

利用波形分析技术预测塔河油田碳酸盐岩储层

针对塔河油田盐体覆盖区下奥陶统碳酸盐岩埋深大,储层非均质性强的特征,利用地震波形变化特征半定量识别和预测优质储层分布。波形分析法是根据碳酸盐岩储层裂缝和孔洞结构特有的非均质性,建立地质模型,结合地震波形分析和反射机理研究,确定储层与地震响应之间的对应关系,根据建立的碳酸盐储集层地震识别模式,进而对未知区域作储层预测。     

西南某水电站厂房上游侧后坡变形体稳定性研究

电站厂房上游侧后坡受施工排水、边坡开挖等综合因素的影响,形成了规模巨大的变形体,其稳定性直接威胁了厂址的安全,为此对变形体进行了地质钻探、物探、地面三维变形监测和稳定性计算等研究.结果表明:变形体为整体推移式、局部牵引式的蠕变滑移;从成因和机理分析,施工排水和降雨是诱发形成的最主要因素;其天然稳定性随着降雨量的变化而呈周期性变化,雨季的稳定性差,旱季有所提高,但在饱水或地震条件下,存在失稳的可能.     

基于正交试验设计的岩坡力学参数反演

对某岩坡Ⅲ区现场勘察后认为,该区为断层破碎带,属碎裂结构,岩体分级为Ⅳ级.由于地质情况复杂、岩体破碎以及边坡开挖引起的应力释放等原因,致使边坡岩体加固的力学参数用常规方法较难确定.运用正交试验设计的方法借助有限差分程序FLAC进行分析,以安全系数作为评价指标,模拟各参数不同水平的各种组合,对影响边坡稳定性的各因素进行了敏感性分析,并对边坡力学参数进行了反演,得出较为合理的力学参数,为边坡治理提供依据.     

基于Hoek-Brown准则的深部岩体力学参数及其应用

基于Hoek-Brown经验强度准则,采用最小二乘法拟合出岩体力学强度参数,并与H-B_02ed推荐的等面积拟合结果进行对比,结果发现两种拟合方法得出的岩体内摩擦角数值相差很小,但等面积拟合法得出的黏聚力强度远高于最小二乘拟合法。将两种强度参数拟合结果应用于深部矿体开采的数值模拟,发现采用最小二乘拟合法的岩体强度参数其模拟结果更接近工程实际。该方法对深部岩体力学参数的确定具有一定的借鉴意义。     

Discrete element approach for mine dump stability analysis

Mine overburden dumps have posed significant safety issues in the operations of various unit operations of open pit min-ing especially the external dumps. The external dumps are composed of a mixture of fragmented rocks and loose soil. Their charac-teristic is comparable to heavily discontinuous solid mass. The conventional approach of limit equilibrium methods provide safety factors for the slope but nothing about the stress-strain characteristics of the large dump mass. The designs of dump location and their respective geometry are integrated for the know-how of the stability characteristics of these dumps. The discrete element method uses a circular disk to represent the granular solid mass and their interactions are described by the Newton's third law of motion. The displacement is described by the sliding of the circular disk. This work is focused on the modeling efficiency of the discrete element methods to represent the behaviour of mine dump masses with the specified joint plane for the limit equilibrium method. The advantage of the work lies on the ease of information retrieval at any point at the dump mass concerning the stress and strain histories, displacement, failures etc. which when integrated produces a better understanding of the stability of the dump masses.     

Particle simulation of the failure process of brittle rock under triaxial compression

In order to investigate the failure process of brittle rock under triaxial compression through both experimental and numerical approaches, the particle simulation method was used in numerical simulations and the simulated results were compared with those of the experiment. The numerical simulation results, such as fracture propagation, microcrack distribution, stress-strain response, and damage patterns, were discussed in detail. The simulated results under various confining pressures (0-60 MPa) are in good...     

Monitoring slope deformation using a 3-D laser image scanning system:a case study

An ILRIS-36D 3-D laser image scanning system was used to monitor the Anjialing strip mine slope on Pingshuo in Shanxi province.The basic working principles,performance indexes,features and data collection and processing methods are illustrated.The point cloud results are analyzed in detail.The rescale range analysis method was used to analyze the deformation characteristics of the slope.The results show that the trend of slope displacement is stable and that the degree of landslide danger is low.This work indicates that 3-D laser image scanning can supply multi-parameter,high precision real time data over long distances.These data can be used to study the distortion of the slope quickly and accurately.     

Numerical simulation on bolted rock joint shearing performance

A Double Shear Model(DSM)was used in a numerical simulation on bolted rock joint shearing performance.An entire bolt deformed as the letter"U"under a shear load between two joints.Near the bolt-joint intersection,the bolt partly deformed as the letter"Z".There were two critical points along the bolt: one was at the bolt-joint intersection with zero bending moment and the other at the maximum bending moment(plastic hinge)with zero shear stress.The blocks on two sides slid along the bolt as it deformed.A separation area was found between the two joint contact surfaces of the middle rock block and sided block.This area of separation was related to bolt diameter and external forces.We assume that this area is related to the work of external forces.Further research is needed.     

新型半刚性网壳锚喷支护技术在软岩巷道中的适用性研究

通过对钢筋网壳锚喷支护的技术特色、结构特点、支护原理的研究,分析了半刚性网壳支护结构对软岩支护的适应性。并完成了室内整架载荷试验。结合在桃园矿的应用情况,阐述了其支护参数选择和施工工艺,并对其进行现场监测,分析了这种新型支护形式的支护性能。实践证明,空间网壳锚喷支护结构与围岩相互作用的整体性好,具有良好的力学性能与较高的承载能力,是软岩巷道中的一种既经济又安全可靠的支护结构形式。