Theoretical framework, key technologies and engineering applications of geological layer modification in mining [PDF]
The modern coal industry has put additional demands on geological support work in its quest for superior development. Conventional geological exploration theories and technical approaches, which are mainly concerned with resource survey, need to be ...
Anye CAO +10 more
core +1 more source
Geological environment and main geological safety challenges in the northern segment of the southeast Xizang (Tibet) power transmission corridor [PDF]
Objective Southeast Xizang(Tibet) boasts a wealth of hydroelectric resources, attributed to its distinctive topography, geomorphology, and climatic conditions.
LI Xianxin +4 more
core +1 more source
Shuitu Baochi Xuebao, 2007 通过对比分析季节性冻融条件下草地与裸地入渗试验结果,得到了草地冻融条件下的入渗规律。结果表明,在冻融各阶段,地表0~40 cm深度范围内,草地地温均高于裸地,但土壤含水率低于裸地;在土壤初冻和融化阶段,草地入渗90 min累积入渗量大于裸地,但其初始入渗强度小于裸地初始入渗强度;在土壤完全处于冻结状态时,草地与裸地的入渗过程、入渗量基本相同。研究结果为草地冻融土壤入渗特性的进一步研究奠定基础,为区域水土保持与生态修复工程及季节性冻土区冬春灌溉提供参考。
延耀兴, 郑秀清
doaj +2 more sources
Combination of InSAR and neural networks for the deformation monitoring and prediction of Fanjiaping landslide [PDF]
Traditional methods for monitoring surface deformation of landslides have significant limitations, including small monitoring coverage, difficulty in acquiring information in complex terrains, and high economic costs.
Shuqiang LU +3 more
core +1 more source
Three dimensional efficient regularized meshfree simulations of slope failure induced by rainfall and freeze-thaw processes [PDF]
, 2015 边坡失稳破坏是一类常见的自然灾害形式。边坡破坏诱发的因素很多，其中尤以降雨引发的滑坡灾害最为突出。同时，随着西部大开发的深入，寒冷地区冻融作用导致的边坡破坏也日益受到重视。然而，边坡失稳涉及到土体骨架、水（冰）、空气等多相耦合即相互作用，是一个复杂的非饱和土体大变形损伤破坏过程，需要借助精确高效的数值方法进行分析、预测和预防。本文利用无网格法仅采用节点离散、适于大变形分析的优点，着重研究了降雨及冻融影响下边坡破坏的三维高效无网格数值模拟方法。 本文首先针对降雨诱发边坡破坏问题 ...
孙明
core
Analysis of the landslide movement characteristics in Biyi Village, Ganluo County, Sichuan Province, through SPH numerical simulation [PDF]
Due to continuous heavy rainfall, landslides were triggered in Biyi Village, Ganluo County, Sichuan Province, resulting in significant property losses.
Jiyang PAN +3 more
core +1 more source
Gaoya dianqi, 2005 季节因素引起的土壤结构的改变必然影响地网的安全性能。对于均匀土壤和双层土壤模型,采用数值分析技术讨论了考虑季节影响后接地系统的设计方法。接地系统的优化设计应在充分调查当地冻土层厚度的基础上,分析比较不考虑冻土层时在存在冻土层季节时的安全性,和考虑冻土层时在无冻土层季节的安全性能,从而综合得到优化设计的方法。
于刚, 孙为民, 何金良
doaj
Dianci bileiqi, 2019 季节性冻土的融冻循环过程会导致土壤电阻率和冻土层分界面随季节变化,冬季输电线路杆塔地网接地电阻可能上升,甚至超过标准限定值,影响线路的安全稳定运行。为了研究季节性冻土因素对杆塔地网接地电阻的影响,仿真研究了冻土层结构及冻土层厚度对其接地电阻的影响,并采用柔性石墨和圆钢接地材料同沟敷设的方案对实际输电线路杆塔地网进行了改造,对比分析了接地电阻的差异。研究结果表明:在不同冻土层结构和冻土层厚度情况下,柔性石墨地网相比于圆钢地网,其接地电阻最大降阻率分别达到了18. 76%和23.
刘洪涛, 张雷, 熊佳, 杨琪
doaj
Mechanism analysis on anisotropic degradation of sandstone in freeze thaw environment based acoustic emission [PDF]
In the freeze-thaw environments, the fracturing of bedding rock poses a significant threat to the stability of the projects in cold regions, leading to potential engineering accidents.
Bing LIU +4 more
core +1 more source
Gaoya dianqi, 2019 季节性冻土地区,冬季土壤冻结后,其电阻率急剧增加,不仅导致接地电阻上升数倍,同时会引起变电站内部短路时流入地网的故障电流发生变化。文中研究了季节性冻土地区土壤冻结深度对地网分流系数的影响规律。首先建立了季节性冻土地区的土壤结构模型,根据土壤的冻结规律,改变土壤的结构与电阻率,仿真得到了不同情况下变电站地网入地短路电流的分配规律。研究发现:由于杆塔的接地体埋深要小于地网的埋深,杆塔接地装置受冻土影响更大,导致变电站分流系数急剧增加,甚至超过50%,使得原有地网设计无法满足安全标准 ...
马力 +4 more
doaj