Feasibility Research on a Novel Rock Drill Concept

在硬岩中钻孔进行开挖和采矿施工， 通常用旋转冲击钻进行。 虽然进步 在过去的二十年里， 碳化钨刀片，液压驱动和水射流工艺， 直到被归类为缓慢和昂贵。 钻井新概念 含有磨料的高压水射流已经显示出相当大的 有希望，并可以显着提高生产力的岩石钻探。 该研究计划将涉及设计，制造和测试 一种能够在硬岩中钻孔的新型磨料/水射流钻头， 高速，没有移动的机械部件。 设计 包括具有高压喷嘴的钻头，以形成水 射流 研磨剂在喷射之后被送入散布器部分中的喷射器中， 形成了高速射流。 的设计和制作， 将对钻头进行评估，以确定钻孔参数 包括水压、水流量、磨料类型、磨料流量 不同针入度下的速率、磨料尺寸和间距 rates. 福禄工业在开发磨料水方面有着丰富的经验 用于各种工业应用的喷射切割系统， 车削、铣削、切削和表面精加工。 校长 调查员有超过15年的水射流经验，是一个 该领域的权威。 我们期待着成功的发展 这可以导致硬岩钻探操作中的主要成本降低 in an international国际scale规模. 建议给予奖励。 8612876 鲁德尼基 这是一项与能源部（DOE）合作的研究。 DOE 提供设施和技术人员进行实验 对岩土材料剪切局部化分析进行了验证。 这项研究应用了最新的固体力学进展来理解剪切 本地化行为，并开发一种经过验证的方法来预测 岩石和混凝土结构等地质材料的稳定性。 这项工作的主要目标是了解的物理过程， 并提供了一个理论框架 用于将实验室观察结果外推到应用中。 的 研究对岩石中的剪切局部化进行了全面的研究 以及其他地质材料 非弹性变形和非弹性体积变化的敏感性。 的 联合收割机的研究将理论分析与计算和实验相结合 工作 多轴非弹性变形的改进本构关系 并将制定一个框架， 数值代码中的本构模型。 具体来说， 压力敏感和不可弹性压缩的固体将 研究的基础上，模型涉及分歧，从齐次 变形 本地化的调查将被用于 实验观察和数值计算来研究 多轴非弹性本构关系的性能 地质构造变形 首席研究员是力学领域的领导者 应用于应变局部化的研究。 这项合作研究是 具有成本效益，解决了Solid中的关键问题， 地质力学研究。

Drilling holes in hard rock for excavation and mining construction is generally carried out with rotary percussion drills. While advances have been made in percussion drilling in the past twenty years including tungsten carbide inserts, hydraulic actuation and water jet process is till classified as slow and expensive. New concepts of drilling with high pressure water jets containing abrasives have shown considerable promise and could significantly improve productivity in rock drilling. The research program will involve the design, fabrication and testing of a novel abrasive/water jet drill capable of drilling in hard rock at high speed with no moving mechanical components. The design incorporates a drill head with a high pressure nozzle to form a water jet. Abrasives are fed into the jet in the spreader section after the high velocity jet has been formed. The design and fabricaiton of the drillhead will be evaluated to determine the drilling parameters including water pressure, water flow rate, abrasive type, abrasive flow rate, abrasive size and stand-off distance for different penetration rates. Flow Industries have extensive experience in developing abrasive water jet cutting systems for a variety of industrial applications including turning, milling, cutting and surface finishing. The principal investigator has over 15 years experience with water jets and is a leading authority in the field. We anticipate a successful development which could lead to major cost reduction in hard rock drilling operation on an international scale. An award is recommended. 8612876 RUDNICKI This is a cooperative research with the Department of Energy (DOE). DOE provides the facility and technical personnel to perform experimental verfication for the analysis on shear localization of geo-materials. The research applies recent solid mechanics advances to understand shear localization behavior and develope a verified approach to predict the stability of geo-materials such as rock and concrete structures. The main goal of this work is to understand the physical process of strain localization in geo-materials and provide a theoretical framework for the extrapolation of laboratory observations to applications. The research performs comprehensive studies on shear localization in rocks and other geo-materials that exhibit sensitivity of inelastic deformation and inelastic volume change. The studies combine theoretical analyses with computational and experimental work. Improved constitutive relations for multiaxial and inelastic deformation will be formulated and a framework will be developed for the use of constitutive models in numerical codes. Specifically, shear rupture in pressure-sensitive and inelastically compressible solids will be investigated based on models involving bifurcation from homogeneous deformation. The investigations of localization will then be use with experimental observations and numerical calculations to study the performance of inelastic constitutive relations for multiaxial deformation of geo-structures. The Principal Investigator is a leader in this area of mechanics research applied to strain localization. This cooperative research is cost effective and addresses a critical problem in Solid and Geomechanics research.