Study on the Optimization of Support Parameters of Metro Station Constructed by Arch Cover Method

Geotechnical and Geological Engineering - The arch is the main stress structure of metro station in the construction of arch cover method. The preliminary geological survey has some limitations,...     

断层输导下储集层排驱压力对油气成藏影响作用

利用油气成藏物理模拟方法,从排驱压力角度研究了断层输导下的油气藏形成过程。研究表明,储集层排驱压力控制与断层侧向配置不同储盖组合的成藏次序,即排驱压力小的储盖组合优先成藏,排驱压力较大的储盖组合次之,这种控制作用与储盖组合的空间相对位置无关;排驱压力影响不同储盖组合的含油或含气饱和度,排驱压力越小,含油或含气饱和度越高,这种影响作用会因储集层空间相对位置的不同而有所差异;断层与储集层的对接与否是储盖组合成藏的先决条件,与断层对接具备成藏的可能性,而未与断层对接则难以成藏。研究结论可用于勘探实践中对断层输导下多套储盖组合试油层位进行评价优选。     

丰都名山崩滑体失稳的离散元模拟

以丰都名山崩滑体为研究对象,拟通过对该崩滑体失稳破坏过程的离散元模拟分析,达到对该崩滑体的稳定性进行有效分析评价的目的。研究结果发现,崩滑体的滑移崩塌过程及散落情况与其坡脚是否风化剥蚀相关,且不论坡脚是否风化剥蚀,其上部块体的运动轨迹与中下部块体的运动轨迹存在着明显差异。分析结果同时还表明,丰都名山崩滑体的确存在滑移崩塌危险,应积极采取适当防范措施。     

Tsunami-induced scour at coastal roadways: a laboratory study

Coastal roads are lifelines for bringing emergency personnel and equipment into affected areas after tsunamis, thus careful thought should be given to how to make roadways safer from tsunamis. Scouring at roadways is the primary damage caused by tsunamis; however, tsunami-induced scouring and beach erosion are less understood compared to tsunami runup and tsunami inundation. A set of laboratory experiments are reported in this study on tsunami-induced scour at a road model situated on a sandy beach. Our experiments showed that the distance between the shoreline and a roadway, which varies with tides, was a key factor affecting the scour depth at the road. Having the coastal road at about half of the inundation distance is not the most ideal location. The depth of road embedment did not affect the scour depth in our experiments. It was also found that for typical tsunamis, the scour depth is unlikely to reach its equilibrium stage. The information reported in this study is useful for local authorities to assess potential tsunami damage of roads and to have a better plan for tsunami disaster relief.     

Study on the Development Laws of Bed-Separation Under the Hard-Thick Magmatic Rock and its Fracture Disaster-Causing Mechanism

Based on the analysis of dynamic phenomena under the condition of high-located hard-thick (HLHT) stratum of one coal mine, along with the similar material simulation and theoretical analysis, the characteristics of bed separation development and cracks distribution under the HLHT stratum are studied. This paper proposes a discriminating method for overlying strata Three Zones considering the influence of HLHT stratum. The development laws of cracks and disaster-causing mechanism of hard-thick magmatic rock in different strata are respectively analyzed. The studies show that in line with the working face advancing direction, the height of bed separation under the magmatic rock increases in the trend of “Increase–Stability–Decrease”, and the width of bed separation increases linearly. The width of bed separation reaches the maximum before the first breaking of magmatic rock, the bed separation completely closes after the breaking. There are no obvious bed separations during the period migration of magmatic rock. Along the direction of the height of roof, the development of bed separation is characterized by bottom-up jump based on the key strata. The analyzed results of “Three zone” height obtained by the discriminate method of overlying strata Three Zones which is based on the key strata theory and the S–R instability theory are in line with the actual facts. When the hard-thick magmatic rock is in the fractured zone, large amounts of gas and water are easy to accumulate in the bed separation space and “O” ring space around the gob. The first breaking of magmatic rock may induce bed separation gas outburst and water inrush. When the hard-thick magmatic rock is in the sagging zone, the long-term stability of magmatic rock will not cause serious disasters. But with the adjacent working face mining, bed separation gas and water often become a safety hazard.     

长江中下游及邻区基底和花岗岩成矿元素丰度背景的研究

本文系统地研究了长江中下游及邻区的结晶基底,褶皱基底及花岗岩岩基成矿元素丰度背景,从而为区域Ｃｕ、Ａｕ,Ｗ、Ｓｎ等成矿作用提供了一套完整的基础地球化学数据,用此来作为窥视地壳组成及成矿作用时空演变的窗口。     

矿物X射线粉末衍射定性分析检索程序简介

介绍用APPLE-II微型机编制X射线粉末衍射定性分析的检索程序特点和应用效果.     

吉林省延边开山屯地区大蒜沟组生物化石的发现及其意义

在延边开山屯地区大蒜沟组地层中,发现的植物化石大部分在吉南—辽东地区太原组中所常见,具有明显的晚石炭世华夏植物群的色彩;动物化石也大多属石炭—二叠纪常见分子。将具有这种生物组合的大蒜沟组置于晚石炭世—早二叠世早期是合适的。