坝基岩体分类

本文根据岩体结构类型等因素对坝基岩体质量的影响,提出了坝基岩体分类的新方案,并结合工程建筑类型进行岩体质量评价的探讨。     

坝基岩体分类

本文根据岩体结构类型等因素对坝基岩体质量的影响，提出了坝基岩体分类的新方案，并结合工程建筑类型进行岩体质量评价的探讨。     

基于BQ指标的深埋铁路隧道支护压力评估方法

支护压力的评估对于支护结构系统的设计及隧道施工的安全至关重要.目前,有较多基于不同岩体分类系统的支护压力评估方法,例如Q系统,GSI系统和RMR系统等.但各种岩体分类系统都是基于不同地区的隧道地质条件建立起来的.因此,每种岩体分类系统都具有一定的区域性.自BQ-Inex(BQ系统)出现以来,在中国岩石工程领域得到了广泛...     

工程岩体结构类型定量划分问题研究

通过构造工程岩体结构分类的三角多基工函数,基于实际工程的岩体结构典型特征, 其数学特征所展示的韵律进行岩体结构类型划分和识别,提出并建立了坝基工程岩体结构这量划分的改进的分数维连亨明法,得到三峡坝基岩体结构标准特征向量分维值及亨明核,最后提出了岩体结构的人工神经网络遗传算法动态建模方法。     

地下储油库岩体水文地质分类及工程应用研究

目前现行的岩体分类标准是以评价围岩稳定性为目的的,不能满足工程对围岩渗透性的要求。以现行岩体分类标准和水封洞库工程特殊性为基础,考虑岩体质量和岩体导水性,并将结构面的连通率、张开度、产状等因素引入评价标准,采用施工勘察、超前地质预报等技术手段,建立了一种服务于水封洞库施工的水文地质分类方法。水文地质分类指导洞库围岩的注浆工作,采用地质雷达和压水试验对注浆效果进行检验,确保了洞库围岩稳定性和水封性。     

一种修改的CSIR岩体分类方法

引入分形几何理论，对ＣＳＩＲ岩体分类系统作了改进．使原先的５个基本参数缩为４个．由于在修改后的ＣＳＩＲ分类方法中直接利用分形维数作为一个基本参数，使用修改后的ＣＳＩＲ方法能更准确地评价岩体性状，具有较高的学术和工程意义．为了说明新方法的实用性，列举了一个工程实例．     

TSP203系统在岩体分级中的应用研究

从工程岩体分级的发展状况出发,介绍了目前国内主要应用的三种岩体分类方法以及TSP（TunnelSeismic Prediction）203系统所能提供的有用信息.通过比较各种岩体分级方法所考虑的基本参数,探讨其与TSP203系统相结合的可能性.最后通过实例验证了TSP203系统与国标《工程岩体分级标准》相结合的有效性.     

岩体质量分类

岩体质量分类是水电工程基础工作中的重要环节。本文用四种不同的岩体质量分类方法,选择不同的岩体结构类型对云南某水电工程右岸岩体质量进行了分级。结果表明,对于各类岩体结构类型,四种岩体质量分类方法所得出的结果非常接近。其对应关系分别为碎裂结构一般为Ⅴ－Ⅵh岩体,镶嵌结构一般为Ⅵv－Ⅵa岩体。次块状结构一般为Ⅵa－Ⅲb岩体,块状结构一般为Ⅲa－Ⅱ岩体。并且根据评价结果,作出了研究区625高程的岩体质量分区图,为下一步的参数配套工作奠定了必要的基础。     

工程岩体结构类型定量划分问题研究

通过构造工程岩体结构分类的三角多项式函数,基于实际工程的岩体结构典型特征,利用其数学特征所展示的韵律进行岩体结构类型划分和识别,提出并建立了坝基工程岩体结构定量划分的改进的分数维连续亨明法,得到三峡坝基岩体结构标准特征向量分维值及亨明核．最后提出了岩体结构的人工神经网络遗传算法动态建模方法．     

岩体材料宏观损伤性质的研究

本文将岩体的裂隙系统考虑成岩体的宏观损伤场，并将损伤力学和断裂力学有机地结合起来，建立了多裂隙岩体宏观损伤性质的影响。     

中等地应力地区建基岩体卸荷松弛特征研究

高地应力地区的建基岩体卸荷松弛特征受到广泛关注,而中等地应力地区的建基岩体卸荷松弛特征及受控因素,国内外却鲜有报道。本文以大岗山水电站为例,揭示中等地应力地区建基岩体的卸荷松弛特征,这既是对西部水电工程中建基岩体卸荷松弛理论的补充,又为大岗山水电站建基岩体的后期工程处理提供科学依据,因此研究意义重大。在大岗山水电站地质背景条件的研究基础上,依靠现场调研和大量的钻探、物探、孔内摄像等测试手段,讨论了中等地应力地区坝基开挖后的卸荷松弛特征,包括表生卸荷松弛和内生卸荷松弛两类现象,总体表现为裂隙张开、岩体松动、整体松弛的特点,几乎无新生岩石破裂产生,具有典型的继生性特征。同时指出,中等地应力地区建基岩体的卸荷松弛特征受到岩体结构的控制性作用。     

Prediction of rotary drilling penetration rate in iron ore oxides using rock engineering system

Prediction of the drilling penetration rate is one of the important parameters in mining operations. This parameter has a direct impact on the mine planning and cost of mining operations. Generally, effective parameters on the penetration rate is divided into two classes: rock mass properties and specifications of the machine. The chemical components of intact rock have a direct effect in determining rock mechanical properties. Theses parameters usually have not been investigated in any research on the rock drillability. In this study, physical and mechanical properties of iron ore were studied based on the amount of magnetite percent. According to the results of the tests, the effective parameters on the penetration rate of the rotary drilling machines were divided into three classes: specifications of the machines, rock mass properties and chemical component of intact rock. Then, the rock drillability was studied using rock engineering systems. The results showed that feed, rotation, rock mass index and iron oxide percent have important effect on penetration rate. Then a quadratic equation with 0.896 determination coefficient has been obtained. Also, the results showed that chemical components can be described as new parameters in rotary drill penetration rate.     

基于声波速度及岩块强度的开挖扰动区岩体力学参数预测

针对目前在水利水电工程中开挖扰动区的岩体力学参数取值问题,将岩体的声波速度与岩体质量指数Q、岩体分类指数RMR及地质强度指标GSI联系起来,并将声波速度引入到广义Hoek-Brown强度准则中,建立了由岩体声波速度及岩块单轴抗压强度预测开挖扰动区岩体的变形及强度参数的方法.利用三峡工程永久船闸边坡开挖扰动区的检测参数,结果表明,基于Hoek-Brown准则由声波速度及岩块强度预测的岩体变形模量与实测结果基本吻合,本方法可预测开挖扰动区的岩体力学参数.     

基于BP神经网络的岩体分类指标的相关性研究

在国内外岩体质量评价分级研究进展的基础上,分析了目前主要评价方法尤其是RQD值法所存在的不足之处.总结了岩体结构、岩体质量及其与岩体质量分级的关系,讨论了主要岩体质量评价分级方法的基础及相关性.     

Development of 2D computer program to determine geometry of rock mass blocks简

Due to various geological processes such as tectonic activities fractures might be created in rock mass body which causes creation of blocks with different shapes and sizes in the rock body. Exact understanding of these blocks geometry is an essential issue concerned in different domains of rock engineering such as support system of underground spaces built in jointed rock masses, design of blasting pattern, optimization of fragmentation, determination of cube blocks in quarry mines, blocks stability, etc. The aim of this paper is to develop a computer program to determine geometry of rock mass blocks in two dimensional spaces. In this article, the geometry of jointed rock mass is programmed in MATLAB™.     

Gas-dynamic phenomena caused by rock mass tremors and rock bursts

Similar to coal, rock and gas ejections, rock mass tremors and rock bursts are among the most serious natural hazards accompanying the underground extraction of coal. Gas-dynamic phenomena caused by rock mass tremors and rock bursts observed as transient states of air parameters in mining headings,are usually generated as a result of a change in the geometry of headings and the release of considerable amounts of gases. Particular significance is attributed to transient states caused by disasters, which are often accompanied by rapid incidents, presenting threats to the life and health of the underground crew.In Polish mining there are known examples of transient states of air parameters recorded during gasdynamic phenomena, e.g. tremors and rock bursts. The paper presents the case studies of rapid seismic incidents to show how records in mine monitoring systems broaden the knowledge about the transient states of air parameters in mining headings generated because of them.     

A novel rock bolting system exploiting steel particles

The effectiveness of rock bolting in ground control has been extensively investigated, mainly for resin based systems. Alternative coupling materials are needed to have good mechanical performance and to reduce the economic impact. This study proposed a new bolting system exploiting steel particles as coupling material. The applicability of this system was assessed by laboratory and field pullout tests, assisted by digital imaging correlation (DIC), infrared thermography (IRT) and acoustic emission (AE). The results indicated that, for a 20 mm diameter bolt, the suitable steel particle size and corresponding inner diameter of borehole were 1.4 and 28 mm, respectively. For bolts installed in steel tubes, the particles improved the loading capacity compared to the resin bonded ones. Additional pullout tests on cement blocks indicated that steel particles can be effective for hard rock, whilst resin was a better choice for bolting of soft rock. Similar understanding was obtained by pullout tests in engineering fields, which demonstrated that the steel particles coupled bolts can provide favorable effects in hard rock mass, while the effects were negligible when installed in extremely soft coal mass. The wide set of multi-technique measurements helped to understand the mechanisms involved in the performance of the bolting system with coupling steel particles.