A semi-analytical method for analyzing the tunnel water inflow

This paper proposed a semi-analytical approach for analyzing the problems of the tunnel water inflow. The approach was developed by using the classical ground water theory. The groundwater problem in a finite domain is transformed to a problem in an infinite domain by the image method and the superposition principle. Using the convolution–deconvolution method, the time-variant inflow problem is transformed to a constant flow problem. The calculation formula was developed for the conceptualized hydro-geological models for the tunnel inflow problems. The computation is simple and fast in comparison with the other 2D and 3D numerical methods. The parameters required in the approach are few and easily estimated. Two cases of the tunnel water inflow were simulated by the approach. The calculated inflows agree well with the general trends of the measured inflow data.     

Numerical modelling of flow and transport in rough fractures

Simulation of flow and transport through rough walled rock fractures is investigated using the latticeBoltzmann method （LBM） and random walk （RW）, respectively. The numerical implementation isdeveloped and validated on general purpose graphic processing units （GPGPUs）. Both the LBM and RWmethod are well suited to parallel implementation on GPGPUs because they require only next-neighbourcommunication and thus can reduce expenses. The LBM model is an order of magnitude faster onGPGPUs than published results for LBM simulations run on modern CPUs. The fluid model is verified forparallel plate flow, backward facing step and single fracture flow; and the RWmodel is verified for pointsourcediffusion, Taylor-Aris dispersion and breakthrough behaviour in a single fracture. Both algorithmsplace limitations on the discrete displacement of fluid or particle transport per time step to minimise thenumerical error that must be considered during implementation.
2014 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting byElsevier B.V. All rights reserved.     

浅议扬州地区地下工程排水措施

通过对长江下游扬州地区浅表层地下水水文地质条件探讨,提出不同水文地质单元采用不同降排水手段,并以工程实例介绍各种排水措施,包括人造构造窗的方法.     

水文地质有限元计算数据库管理系统

采用文本文件格式对水文地质有限元剖分的原始数据进行录入修改、查找以及对计算结果的分析等， 管理极其不便。故此， 采用ＦＯＸＰＲＯＷ 和Ｃ语言编制的《水文地质有限元计算数据库管理系统》程序， 即用数据和图形文件， 对其进行有效地规范管理， 效果显著。     

安庆铜矿水文地质特征及矿坑水害防治

介绍了安庆铜矿的水文地质特征,指出随着向深部开采,造成地面塌陷和地表水下灌,致使矿坑最大涌水量出现不断增大的趋势。针对这一情况,对井下出水点进行封堵及地表综合治理,使最大涌水量的增势得以控制,从而得出上堵下排、避免矿井带压开采的防治措施。     

Underground mine stream crossing assessment: A multi-disciplinary approach

Underground mine designs typically try to avoid extraction beneath streams and rivers of any significant size, especially when the overburden rock thickness between the stream bed and the mine is thin.Potential issues with mining beneath streams include excessive groundwater inflow to the mine, weak ground(roof, floor, and pillar) conditions, horizontal stress effects, as well as stream loss and other potential adverse environmental effects. However, there are times when crossing beneath a stream or river is necessary to move into a new area of mineral reserve without creating additional mine access points from the ground surface. Often, stream crossings are completed without thorough assessment, potentially resulting in increased costs, decreased safety, and, in some cases, failure to advance the mine.Selection of the most favorable location(s) to cross the stream must account for numerous factors and the associated assessment often requires a multi-disciplinary approach. Stream crossing investigations often require geological, hydrogeological, geotechnical, and geophysical expertise. Phases of stream crossing investigations include desktop evaluation of maps and aerial photography, stream bed observations, drilling, detailed rock core logging, downhole geophysical surveying, hydraulic conductivity testing(packer testing), geotechnical laboratory testing, assessment, and reporting. The deliverables from a stream crossing assessment typically include geological, geotechnical, and hydrogeological characterization of potential stream crossing locations, classification of favorable and unfavorable crossing locations,recommendations for entry design and pillar sizing, and recommendations for if, and how, to conduct pre-grouting activities. Examples of technical aspects of data collection and assessment are provided based on decades of industry experience conducting stream crossing assessments in various underground mining scenarios.     

柳林矿区水文地质特征及矿井充水因素分析

依据山西省柳林矿区以往的地质勘查及煤矿开采成果资料,对矿区水文地质条件进行了分析,阐述了地下水对煤层开采的影响,分析了矿井充水因素,对矿井开采及防治水害具有指导意义。     

广西大新锰矿井下工程与工业园场地的稳定性关系

通过区域地形描述,结合区域地质构造,分析、推断区域工程地质和水文地质条件情况,利用物探、钻探资料和地下工程资料分析区域地质条件进行,确定地下工程对地面构筑物存在的影响,并提出相应的预防处理措施,确保地表、地下工程的安全。     

Hydrogeochemistry: an investigation tool to evaluate infiltration into large moving rock masses (case study of La Clapière and Séchilienne alpine landslides)

Isotopic and hydrogeochemical methods have been used to investigate groundwater movement inside the La Clapière and Séchilienne alpine landslides in southern France. The δ¹⁸O data were used to determine the infiltration altitudes of the two areas. The infiltration results indicate that the landslides are recharged from beyond the landslides' perimeters. Hydrogeochemical data on major ions were collected from springs. Numerical simulations of water–rock interactions were then undertaken. The major petrographic contrast between the limited sedimentary rocks and the more common micagneiss/micaschist results in a marked change between the measured and calculated groundwater contents. This contrast of 800 mg/l of SO₄ in the Triassic rocks but only 100 mg/l for the waters from the metamorphic strata at La Clapière is significant. Two different groundwaters have been identified in both landslides: (1) a perched shallow saturated zone near the slope summit; and (2) a deep saturated zone located at the foot of the slope. Chemical monitoring of spring waters in the two zones has allowed an assessment of the infiltration within the slope over time. There is a good correlation between the sulphate content of the perched waters and rate of slope movement, with a sulphate dilution peak corresponding to an acceleration in the movement of the landslip. However, there is no correlation between the chemistry of the deep aquifer and the speed of movement. It would appear therefore that the hydromechanical behaviour of the landslide depends on the vertical leakage from the perched aquifer down to the basal aquifer and the near-surface effects of the water movement. Electronic Publication     

大湖金矿水文地质及深部防治水的探讨

针对大湖金矿深部探建工程中出现的淹井问题,首先对矿区水文地质条件进行了详细分析,然后从其水文地质条件及经济技术合理性出发,探讨了深部工程的防治水措施。指出了帷幕注浆、疏干等方法的适用地段。