Results 61 to 70 of about 1,123 (150)
Prediction of water inflow after excavation of underground chamber group with long span and high buried depth [PDF]
Predict the water inflow after excavation of large underground caverns is crucial for the safe construction and operation of underground engineering. To predict the water inflow of underground caverns after excavation and provide guidance for drainage ...
Guanghong JU +5 more
core +1 more source
Dianci bileiqi, 2020 垂直接地极的主体是分散的数根或数十根垂直电极,这一结构特点使垂直接地极的埋深问题与传统水平接地极有很大区别。本文首先采用单根电极模型研究了典型土壤模型下埋深对接地极电气性能影响,提出垂直接地极埋深选取的基本原则。由于垂直接地极的电极一般呈椭圆形布置,计算发现最大跨步电势往往出现在长轴端部附近,提出适当增大长轴端部附近电极的埋深改善接地极跨步电势分布特性的思路。最后结合长翠村垂直接地极跨步电势的实测数据和仿真计算结果 ...
陈伟 +5 more
doaj
Hydroecological effects of mining and its restoration ways in coal mining areas of Western China [PDF]
The mining areas in arid and semi-arid region have become important coal production bases to ensure China’s energy strategic security, however, coal development by large-scale and high-intensity mining has triggered a series of water resources and ...
Guangrong GE +7 more
core +1 more source
Source of mine water during coal mining in the contiguous area of Inner Mongolia and Shaanxi [PDF]
The region where Inner Mongolia and Shaanxi converge is pivotal for the underpinning of national energy security and is also central to the ecological conservation and sustainable development of the Yellow River Basin.
Hui LI, Jian YANG
core +1 more source
Shuitu Baochi Xuebao, 2008 对奇台县坎儿井分布状况、兴衰过程、地质情况、地下水位实地调查和其社会经济的资料分析表明,奇台县坎儿井经历了从1949年开挖,20世纪60年代初数量达到最多,20世纪80年代初期全部废弃的一个由兴到衰的过程。人口增加和农业生产的发展是导致地下水位迅速下降、坎儿井干枯的根本原因。坎儿井数量变化过程与人口、耕地增加过程早期基本一致,后期变化方向相反。人口数量达到90 000人,水浇地为50 000 hm2时,平均地下水埋深为5 m左右,坎儿井开始衰亡。坎儿井全部废弃时平均地下水位约深8 m,此时 ...
XIONG, HAN
doaj
Shuitu Baochi Xuebao, 2020 在岩溶作用下，喀斯特土壤—表层岩溶带耦合发育，上覆土壤中大孔隙与下伏表层岩溶带中裂隙、管道存在密切的水力联系，然而土壤大孔隙影响土壤—表层岩溶带系统中水土漏失的过程机理尚不清楚。通过人工模拟降雨试验，采用试验微区模拟不同土壤大孔隙形态（出露型、浅埋型、深埋型），并以全土微区为对照，探讨了土壤大孔隙对喀斯特地区水土漏失过程的影响。结果表明：与全土微区相比，土壤大孔隙的存在明显加速了水分的垂直渗漏，其对水分渗漏量的影响表现在峰值不同（出露型 > 浅埋型 > 深埋型 > 全土 ...
周春衡 +4 more
doaj
Dizhen xuebao在分析场地条件对地震震害影响及国内外关于软弱土层对场地地震反应影响的基础上，采用实际含淤泥质土层场地资料，建立了12个含软弱土层的场地模型，在不同输入地震动水平下进行了场地地震反应一维等效线性化分析，讨论了软弱土层厚度和埋深对场地地震反应的影响。结果表明：随着软弱土层的埋深或厚度的增加，反应谱特征周期逐渐增大；输入地震动峰值增加，反应谱特征周期亦增大。继而依据软弱土层厚度、埋深及输入地震动强度对场地加速度反应谱特征周期的影响特征，提出了含软弱土层场地地震动加速度反应谱特征周期调整方法。
Zhen Chen +5 more
doaj +1 more source
Petroleum Exploration and Development, 2011 Based on the characteristics of core, thin-section, physical properties and carbon, oxygen and strontium isotope, the characteristics of Lower Paleozoic dolomite reservoirs, dissolution features and mechanism in eastern Tarim Basin were studied.
Zhenkui Jin, Kuanhong Yu
doaj +1 more source
Dynamic evaluation of landslide susceptibility in Heifangtai, Gansu based on time-series InSAR and multi-temporal cataloguing [PDF]
Landslide disasters occur frequently in the mountainous regions of western China, and accurate classification of landslide hazard risk levels is crucial for effective geohazard mitigation.
Jiebo QU +5 more
core +1 more source
盐渍化改造区土地利用变化对地下水资源的影响 --以河北省曲周县为例
Shuitu Baochi Xuebao, 2005 运用GIS空间分析功能、柯布—道格拉斯生产函数以及曲周县统计资料和地下水资料,分析了近20年来土地利用变化及其对地下水资源的影响,研究结果表明,作为盐渍化改造区以农业为主的曲周县,土地利用变化速度不快且土地用途转移主要是耕地转变为农村居民点和城镇用地;耕地灌溉率、复种指数、耕地灌溉面积、粮食产量不断提高;粮食和蔬菜产量对地下水资源的高度依赖性,是引起地下水埋深变化的主要原因;依据河北省地下水超采区划分标准,曲周县浅层地下水开采区是基本平衡区,深层开采区属于中度超采区 ...
李新波 郝晋珉 丁忠义 李宇 路鹏
doaj