深部高应力巷道的非对称大变形

针对深部巷道尤其是倾斜岩层中的巷道围岩大变形问题,根据和分解有限变形力学理论,采用深部工程软岩大变形力学设计与分析系统(LDEAS)对旗山-1000 m 水平北翼轨道联络大巷的开挖过程进行了数值模拟.结果表明,倾斜岩层中巷道出现底板臌起、两帮缩进,顶板出现大面积的下沉;底板臌起、两帮缩进量的最大值和顶板的最大下沉量均随着巷道底板下岩层弹性模量的降低而呈增大的趋势.和分解增量法分析模型下巷道顶板的最大下沉量要小于两帮的最大收缩量,但是极分解增量法分析模型下巷道顶板的最大下沉量却大于两帮的最大收缩量.     

水电站深部洞室群应力场相关性研究

结合新疆某水电站的深部洞室群稳定性研究工作,利用三维弹塑性有限元方法,详细研究了水电站3个洞室的应力场在开挖过程中的变化规律,发现了"洞室群应力恶化效应",即后期的洞室施工对邻近洞室的应力场有恶化作用,加剧了前期开挖洞室的应力集中效应;以及"洞室群圆弧拱顶应力优化效应",即后期的洞室施工对邻近洞室拱顶的应力场有优化作用,减缓了前期开挖洞室拱顶的应力集中效应,这一规律的发现将对深部洞室群稳定性控制具有一定的意义.图5,表2,参10.     

纵向岭谷三江并流区河谷地貌特征分析

西南纵向岭谷地貌区北部的三江并流区是我国高山深谷发育的典型区域。金沙江、怒江、澜沧江、独龙江自北向南奔流，形成了较为典型的以峡谷为主的河谷地貌。其河谷地貌的主要特征有：突出的纵向岭谷地貌，构成了少有的三江并流奇观；地貌相对高差大，河谷深切；河谷地貌形成演化发育明显受地质构造控制；流域范围内地貌类型和地貌组合多样化特征突出；地质地貌环境具有较强烈的生态脆弱性；河谷支流水源多发源于高山湖泊，两岸支流河谷分布不均衡。形成了独具特色的“三江并流”河谷地貌。     

高韧性易燃特厚煤层巷道自燃监测预报技术

针对磁窑堡二矿自然发火期短且为高韧性特厚易自燃煤层,且综放面回风顺槽与多个旧巷贯通或相邻,使得巷道掘进及回采期间自燃危险性增大的特点,对巷道掘进期间实施了有效的防灭火措施方案,保障综放面安全顺利开采。     

煤矿软岩巷道顶底板剪切变形破坏机理

通过石嘴山一矿38区 600 m轨道巷表面收敛监测及变形破坏的研究,总结出了变形破坏特征。以矿山压力假说为前提,对巷道围岩典型破坏特征作出理论推断,建立巷道顶底板的力学模型,并应用关键层理论、块体理论、弹性力学对巷道变形破坏进行理论分析与求解,得出了巷道顶底板发生剪切破坏判定条件,并用FLAC3D数值模拟验证其正确性,为深部巷道支护提供了新的理论依据。     

煤矿软岩巷道顶底板剪切变形破坏机理

通过石嘴山一矿38区＋600m轨道巷表面收敛监测及变形破坏的研究，总结出了变形破坏特征。以矿山压力假说为前提，对巷道围岩典型破坏特征作出理论推断，建立巷道顶底板的力学模型，并应用关键层理论、块体理论、弹性力学对巷道变形破坏进行理论分析与求解，得出了巷道顶底板发生剪切破坏判定条件，并用FIAC加数值模拟验证其正确性，为深部巷道支护提供了新的理论依据。     

From deep basin gas to diagenetic trap—An example from the Yulin Gas Field in the Ordos Basin

In the updip portion of the Yulin Gas Field in the Ordos Basin, there are no any structural, stratigraphic and sedimentary lithologic seals. Using thin-section petrography, ultraviolet fluorescence microscopy, micro-thermometry and Raman microspectrometry, this paper finds out the diagenetic trap and studies the diagenetic history of this field. It was revealed that three phases of diagenesis and hydrocarbon charging happened in late Triassic, late Jurassic and the end of early Cretaceous respectively. In the first two phases, acid geofluid entered the reservoir and caused dissolution and cementation. Although the porosities had been increased, further compaction accompanying re-subsidence resulted in tight sandstone and conglomerates. Till the end of the early Cretaceous, bulk of gas migrated into the tight reservoir. Cementation, however, kept on in the updip portion of this field due to low gas saturation and formed the diagenetic trap. The mechanism for gas accumulation was changed from deep basin gas to diagenetic trap, which offers a sealing condition that can retain gas for much longer time.     

兰州地区深基坑支护技术探讨

分析兰州地区深基坑支护的设计和施工现状,探讨适合于兰州地区的深基坑支护技术.分别介绍土钉墙支护、土钉加预应力锚杆联合支护、框架预应力锚杆支护技术的作用机理,结合工程实例说明其在兰州地区的应用.实践证明,这3种支护技术适合于兰州地区.当基坑深度小于8.0 m时,采用土钉墙比较合适;当基坑深度在8.0~10.0 m之间时,可以考虑采用土钉加预应力锚杆的复合支护结构;当基坑深度大于10.0 m时,选择框架预应力锚杆支护结构更加合理.     

新汶华丰矿井巷松动圈探地雷达实测研究

以华丰煤矿典型巷道围岩松动圈的实测资料为基础，分析了配置２００ＭＨｚ 天线的探地雷达用于探测巷道围岩松动圈的科学性，探测深度小于１０ｍ 、探测精度达０．０５ｍ ，满足确定巷道围岩松动圈边界的基本要求．得出巷道围岩松动圈的发育具有结构特点，其中软弱结构起关键作用，开辟了探地雷达的应用领域     

Systematics and zoogeography of the deep‐sea hyperbenthic family Arietellidae (Copepoda: Calanoida) collected from the Sulu Sea

A faunistic survey of the deep‐sea hyperbenthic copepods in the Sulu Sea, which has a deep basin and is connected via shallow straits with the Pacific and the South China Sea, was carried out in November and December 2002, using beam trawls and a mid‐water trawl. Two new genera and four new species of the primitive calanoid family Arietellidae are described. A new genus Metacalanalis shows intermediate characteristics between those of Metacalanus Cleve, 1901 and Pilarella Alvarez, . Another new genus, Protoparamisophria, is closely related to Paramisophria Scott, 1897, but exhibits more plesiomorphic states in the female genital system and appendages. Two new species of the genera Paraugaptiloides Ohtsuka, Boxshall and Roe, and Sarsarietellus Campaner, 1984 are the second and the third species, respectively, for these genera. This discovery enhances the validity of these rare genera, and sheds light on the geological history of the Sulu Sea and the evolution of the Arietellidae within it.