Boundary effects of rainfall-induced landslides

In the study of landslides, it is generally assumed that an impermeable boundary exists at a certain depth and failure occurs at this boundary. In reality this is not always the case and failures can occur at any depth. This paper aims to study the effect of boundary conditions on landslides, using a series of seepage and stability analyses performed over a range of rainfall intensities, and for different failure mechanisms, by studying the failure time and depths corresponding to fully drained, partially drained, and impermeable boundaries. It is shown that these conditions can significantly affect the occurrence and depth of rainfall-induced landslides.     

Geochemical study of clays used as barriers in landfills

This is a hydraulic and geochemical study on 2 materials: natural clay (AN) and a regenerated material made up of a sand-bentonite (SB) mixture. The hydraulic part allowed us to conclude that a 10% industrial bentonite content mixed with sand offers hydraulic properties that are similar to those of AN material and are lower than the required standards. The geochemical properties of both AN and SB matrixes are comparable with those of some of the synthetic leachates studied. Furthermore, the Langmuir model helped us to identify the adsorption capacities of both matrixes with the following selectivities: Pb > Cu > Cd > Zn.     

以钻代坑坑钻组合勘探在水口山矿的应用

水口山矿在几十年的勘采过程中,摸索出一套以钻代坑、坑钻结合行之有效的探矿工艺途径,在提高矿山近期开采储量级别;对矿体探边扫盲、延长服务年限;代替坑道探矿、查明老窿及含水构造,保证井下安全作业等方面都取得了很好的成绩,地质经济效益显著。     

干旱区根土界面水分再分配及其生态水文效应研究进展与展望

水分限制环境下,植物对生境的适应直接或间接地与植物对水分资源的利用有关。目前已知,根系—土壤系统（又称根土界面）水分再分配是陆地表层系统地下生态过程的一个重要环节,它在植物对土壤水分的利用和生态系统水分循环过程中起着关键调节作用,而且对生态系统的碳氮磷循环与养分平衡等关键过程亦具有重要影响。因此,深入开展水分限制环境下根土界面水分再分配过程及其生态水文效应的研究有重要的科学意义。围绕“水分限制环境下根土界面水分再分配过程及其效应”这一核心问题,重点从根系生态学、根土界面水分再分配发生机理及其生态水文效应及影响根土界面水分再分配发生的主要因子等3个方面对国内外的研究动态及最新研究进展作比较系统的评述;在此基础上,提出了根土界面水分再分配过程及其生态水文效应研究中应重点关注和研究的几个前沿科学问题。     

新丰江水库区水力扩散与诱发地震活动性分析

本文从水力学的观点分析了新丰江水库区水力扩散与诱发地震活动的影响因素，讨论了新丰江水库区水力扩散与诱发地震活动的时空特点及其形成原因。最后用地震面积扩展法分析讨论了新丰江水库区水力扩散率的动态变化及其大地震的发展趋势。指出新丰江库区基底断裂网络是影响其水力扩散与诱发地震活动最决定的因素，也是形成新丰江水库区水力扩散与诱发地震活动时空特，点最主要的原因，并提出６．１级主震发生一年半以后，水力扩散诱发大地震的可能性不复存在。     

Testing the ability of bentonite-amended natural zeolite (clinoptinolite) to remove heavy metals from liquid waste

 The design of environmentally sound liquid waste containment structures has become a crucial task in engineering applications due to ever increasing groundwater contamination from such sites. Construction of such structures usually requires a bottom liner of low hydraulic conductivity as part of the design. In order to reduce the hazards associated with liquid wastes including landfill leachate, bentonite-amended natural zeolite is proposed as an alternative to conventional earthen liners. Among many contaminants associated with liquid wastes, heavy metals are the most dangerous ones. This paper deals with determining the ability of natural zeolite to remove heavy metals from aqueous waste. For this purpose, crushed natural zeolite (clinoptinolite) is amended with commercial powdered bentonite to yield a soil mixture low in permeability and high in ion-exchange capacity. Leachate from a conventional landfill is used as the percolation fluid. Concentrations of certain heavy metals in the effluent fluid percolated through the bentonite-zeolite mixture are compared with that of initial leachate. The conclusion is reached that certain metals are efficiently removed from the influent solution by the soil matrix whereas some ions do not show significant reduction in concentration. This is attributed to high hydraulic conductivity of the bentonite-zeolite mixture.     

水库岩溶渗漏及防渗研究综述

岩溶地区水库渗漏是可溶岩地区兴建水利枢纽的主要工程地质问题之一,尤其是在可溶岩广布、岩溶发育强烈、地形复杂地区,岩溶渗漏成为了该类地区水利水电工程的一个普遍问题.库区的岩溶渗漏不仅影响建坝后的正常蓄水,还将危及坝体的安全与稳定.因此,有必要对库区渗漏,特别是岩溶地区的库区渗漏进行渗漏机理、渗漏特征、渗漏条件等进行详细分...     

Analysis of flow behavior in a landfill with cover soil of low hydraulic conductivity

 This paper presents the results of field tests of hydrologic parameters in a landfill and the results of numerical simulation to find the efficiency of the pumping method to reduce leachate levels in the landfill. The field hydraulic conductivity and storativity of waste and buried cover soils in the landfill are measured by pumping and slug tests. The hydrologic condition inside the landfill is first calibrated using the drawdown-time curve obtained from the pumping test, and the flow behavior of leachate during pumping in the landfill, when various layers of waste and buried cover soil exist, is analyzed through three-dimensional numerical simulation of flow. The results of the field investigation show that the buried cover soil of low hydraulic conductivity forms an impermeable layer preventing the downward flow of leachate and upward flow of landfill gas. The hydraulic conductivities of the pumping test and slug tests were quite close on the same order of magnitude. It was also possible to match the drawdown-time data of the field tests with those of the model using input data close to the hydrologic property obtained from the field tests. The numerical flow analysis showed that pumping was possible up to 120 tons/day for a single well without a drain, while the pumping rate could be increased to 300 tons/day for the same well with the drain. From the vertical section of the flow vector with a horizontal drain, the barrier role of buried cover soil is identified, which was proposed by examining the water contents of the disposed cover soil and waste in the field. Received: 15 May 1998 · Accepted: 4 January 1999     

新疆百里风区强风中尺度特征分析

大尺度环流背景和天山山脉大地形共同作用形成新疆百里风区，其风力之大居全疆九大风区之首。为进一步研究百里风区强风中尺度特征及其与局地地形的关系，选取2018年5月6—8日百里风区强风天气过程，使用WRF模式进行中尺度模拟分析，形成以下结论：天山两侧气压梯度力驱动下冷空气翻越天山，经色皮山口狭管效应和过山波水跃下沉接力加速，在背风坡上空形成强风区，强风区接地形成百里风区地面大风；大风过程中，七角井盆地地形强迫引发有限振幅重力波，背风坡上空大风区之上的临界层吸收上层能量并向下传递，增大了大风区的风速，使得低空大风区的接地更加充分。低空大气稳定层结的强度与大风强度相对应。