Effect of outburst coal’s gas seepage properties under stage cyclic loading

Experiments of outburst coal’s gas seepage and deformation under cyclic loading of the stationary gas pressure and different confining pressures are made by “fluid-solid-heat coupling with axis servo seepage system of coal”. The results show that loading route has a significant effect on mechanical properties of coal sample. Although the complete stress-strain curves and one cyclic loading curve present similarity in the overall trend, the stress peak value of coal sample under cyclic loading is lower. Under cyclic loading, the stress-strain curves during loading and unloading don’t overlap. They connect to form a hysteretic loop. The permeability is in close relation with the damage deformation process of coal sample. Under cyclic loading, permeability is increasing during the unloading and decreasing during the loading. The permeability-strain curves during loading and unloading form a hysteretic loop, which is corresponding with the hysteretic loop of stress-strain curves of coal sample.     

Numerical simulation on the seepage of tailings dam by centerline method construction

Yangla copper mine is going to build a new tailings pond for its tailings disposal. The tailings dam is 185.0 m high and centerline method is used to construct the tailings pond. For the stability of the tailings dam, 2D FLOW program is used for the numerical simulation study about the dam seepage. During simulation calculation, different conditions which include a drainage system installed into the dam or not and different beach widths, i.e. 70 (the flood condition), 100, 300 m (the normal condition), are considered. Through calculation, the change of the seepage under different conditions is obtained, which shows if the drainage system is installed into the tailings dam, the underground water can be successfully drained out. This can keep the phreatic surface level relatively low, so as to improve the stability of the dam.     

输水隧洞径向止水灌浆的施工方法

针对某输水工程地下隧洞大理岩段，在洞室开挖过程中出现涌水及大面积滴渗水情况，从岩性、构造、地下水等多方面进行分析，查明多发涌水的基本原因。针对如何处理涌水问题总结治理措施，并提出具体的止水灌浆施工方案。     

裂隙岩体渗流对边坡稳定影响耦合分析

裂隙中的渗流是岩石边坡失稳的重要因素之一, 根据工程实践,提出了利用三维数值模拟的耦合模型并利用强度折减法来计算复杂边坡的安全系数和应力、应变分布.分析表明,计算结果与实地调查相吻合.     

拉链式塑料渗灌管棚室中地埋基本渗流规律的试验

采用拉链式塑料管作为渗灌管,在大棚中埋于地下不同深度,在不同工作水头下进行了基本渗流规律的试验研究。结果表明,拉链式塑料管扣合缝处可采用氯汀胶粘无纺布作为防渗材料,同时工作水头选为3m比较合适。     

土壤溶质迁移至地表径流过程的室内模拟试验

关于土壤溶质迁移到地表径流,现有研究大多是概念性的认识,对迁移过程中各个部分的定量研究却很少。该文为了量化研究土壤溶质迁移流失过程及其作用机理,通过设计2种水文条件即土壤水分饱和和土壤渗流条件,其中土壤渗流条件设置了2种水头（5 cm,10 cm）,采用人工模拟5组不同地表径流流速,分别研究土壤溶质迁移到地表径流过程中4种途径：土壤侵蚀、伯努利效应、扩散和对流。试验结果表明了伯努利效应导致土壤溶质迁移量增加;特别是在土壤水分饱和条件下,当地表径流流速从55 mL/s升到 200 mL/s时,伯努利效应引起的土壤溶质流失通量占总流失通量的比例从14%升到53%,在土壤水分饱和条件下,混合层深度小于5 mm;但是在土壤渗流条件下,混合层深度随着水头的高低和径流流速的大小而变化。土壤溶质迁移过程同地表径流流速和地下水位高低有着重要关系。     

院基寺水库新设取水口工程运行对溢洪道影响研究

武汉市北部黄陂区前川城区因城市发展需要,拟在院基寺水库增设取水口。由于工程选址在水库溢洪道附近,为分析取水口建成运行对溢洪道的影响,分别从工程建设前后溢洪道泄流能力变化和工程运行时溢洪道边坡渗流稳定两个方面进行研究,采用Flow3D软件对工程建设前后不同泄流工况的流场进行建模并对比分析,应用Geostudio软件选取2处不利断面进行了边坡渗流稳定分析,结果表明工程建设前后溢洪道泄流流量变化小于1%且工程对泄流流场影响可忽略不计;若发生管道渗漏,溢洪道边坡最大水力坡降在规范允许范围内,且工程建设对溢洪道边坡渗流稳定影响较小,研究成果可供类似工程应用参考。     

我国节水灌溉技术的几种典型模式研究

我国地域辽阔,由于实施节水增效灌溉的地区自然、经济、社会条件千差万别,灌溉的对象也多种多样,不可能用一种固定的模式。必须遵循因地制宜的原则,依据不同地区、不同作物的不同要求,建立不同的节水工程模式予以实施。     

渠道防渗防冻胀复合型保温塑料板的试验研究

提出了一种填充玉米秆碎粉的复合型聚氨酯泡沫保温塑料板,初步确定了其配方和制备工艺,通过试验研究了不同玉米秆碎粉粒径（0〈D≤0．45mm,0．45mm〈D≤1.50mm,1．50mm〈D≤4．00mm等3种规格）和填充量对聚氨酯泡沫塑料的密度、压缩强度和导热性能的影响,以及不同的填充量及粒径对聚氨酯泡沫塑料的发泡时间、发泡成型效果的影响．结果表明,当玉米秸秆碎粉粒径一定时,随着填充量的增加,填充玉米秸秆碎粉的聚氨酯泡沫保温材料的密度增大,但压缩强度下降;当玉米秆碎粉粒径为0．45mm〈D≤1．50mm．填充量为30％时,制备的复合型聚氨酯泡沫塑料板的压缩强度（10％压缩变形）为85kPa,导热系数为0．038W／（m·K）,尺寸变化率（-40～＋70℃）为±1％,能够满足渠道衬砌防渗工程中防冻胀破坏的性能要求．经测算,与不填充玉米秆碎粉的聚氨酯泡沫塑料板相比,复合型泡沫塑料保温板的成本可降低约25％,而且能够充分利用农业生产的废弃物,减少丢弃或焚烧这些废弃物对环境造成的污染．