特厚煤层矿井“三量”合理可采期     

寇青安 《煤田地质与勘探》1993,21(4):40-45

以铜川矿务局陈家山煤矿为例,分析了特厚煤层分层开采时,尽管台账上矿井“三量”符合国家规定,但生产接续十分紧张的原因;提出了新的“三量”可采期的确定方法。  相似文献   

南海北部陆架第四纪古河道的沉积特征   总被引：5，自引：0，他引：5  

寇养琦  杜德莉 《地质学报》1994,68(3):268-277

南海北部大陆架浅部地层内，广泛发育有第四纪的埋藏古河道。以河流作用为主的沉积层序，构成了本区低水位沉积体系域和海进沉积体系域重要的组成部分。其中河流切割充填、三角洲角积楔状体，陆架边缘扇的块体滑坡等沉积特征的平面变化和空间组合，反映了南海北部区域海平面下降时期的古地理环境。笔者利用高分辨率地震反射资料，结合钻井地质资料，综合解释了区内浅层第四纪的古河道，研究了古河道的空间分布、地震相反射标志、岩性  相似文献   

吉林省大黑山条垒中部早二叠世地层的发现及其意义     

寇晓威 《吉林地质》1994,13(1):35-41

在吉林省梨树县孟家岭一带，于前人所划属的石炭纪磐石组砂岩、板岩、灰岩中发现丰富动植物化石。经鉴定有Ｈｕｓｌｅｄｉａｃｆｇｍｎｄｉｃｏｓｌａ，Ｓｔｅｎｏｓｃｉｓｍａｓｐ．，Ｃｏｍｐｓｏｐｔｅｒｉｓｓｐ．，其中植物与我国北部和西伯利亚等地区的安格拉植物群相当；从腕足、苔藓虫等化石组合上看均为早二叠世常见分子。大黑山条垒中部的这一首次发现，对吉林省的地层划分、分区及对比具有重要意义。  相似文献   

晋侯高速公路双层煤矿采空区治理工程中的注浆方法     

张昌生吕晋松  张海雷 《探矿工程》2006,33(12):34-36

按照双层采空区治理工程注浆施工的顺序，对晋侯高速公路双层煤矿采空区治理工程施工过程中比较好的方法、经验进行了系统地总结。  相似文献   

Numerical Modelling of the Heterogeneous Rock Fracture Process Using Various Test Techniques     

H. Y. Liu  S. Q. Kou  P.-A. Lindqvist  C. A. Tang 《Rock Mechanics and Rock Engineering》2007,40(2):107-144

Summary A series of numerical tests including both rock mechanics and fracture mechanics tests are conducted by the rock and tool (R–T^2D) interaction code coupled with a heterogeneous masterial model to obtain the physical–mechanical properties and fracture toughness, as well as to simulate the crack initiation and propagation, and the fracture progressive process. The simulated results not only predict relatively accurate physical–mechanical parameters and fracture toughness, but also visually reproduce the fracture progressive process compared with the experimental and theoretical results. The detailed stress distribution and redistribution, crack nucleation and initiation, stable and unstable crack propagation, interaction and coalescence, and corresponding load–displacement curves can be proposed as benchmarks for experimental study and theoretical research on crack propagation. It is concluded that the heterogeneous material model is reasonable and the R–T^2D code is stable, repeatable and a valuable numerical tool for research on the rock fracture process.  相似文献   

Assessment of the biospheric contribution to surface atmospheric CO2 concentrations over East Asia with a regional chemical transport model     

Xingxia Kou  Meigen Zhang  Zhen Peng  Yinghong Wang 《大气科学进展》2015,32(3):287-300

A regional chemical transport model, RAMS-CMAQ, was employed to assess the impacts of biosphere–atmosphere CO2 exchange on seasonal variations in atmospheric CO2 concentrations over East Asia. Simulated CO2 concentrations were compared with observations at 12 surface stations and the comparison showed they were generally in good agreement. Both observations and simulations suggested that surface CO2 over East Asia features a summertime trough due to biospheric absorption, while in some urban areas surface CO2 has a distinct summer peak, which could be attributed to the strong impact from anthropogenic emissions. Analysis of the model results indicated that biospheric fluxes and fossil-fuel emissions are comparably important in shaping spatial distributions of CO2 near the surface over East Asia. Biospheric flux plays an important role in the prevailing spatial pattern of CO2 enhancement and reduction on the synoptic scale due to the strong seasonality of biospheric CO2 flux. The elevation of CO2 levels by the biosphere during winter was found to be larger than 5ppm in North China and Southeast China, and during summertime a significant depletion( 7 ppm) occurred in most areas,except for the Indo-China Peninsula where positive bioflux values were found.  相似文献   

甘肃省阿克塞5.5级地震震害调查与启示     

马小平  朱瑞  寇恒  刘岸果  张晓  张卫东 《震灾防御技术》2022,17(2):340-347

2021年8月26日甘肃省酒泉市阿克塞哈萨克族自治县（38.88°N, 95.50°E）发生5.5级地震,震源深度15 km,震中烈度为Ⅶ度,震区总面积为1 352 km2,距震中30 km处存在烈度异常点。本次地震震害较轻,未造成人员伤亡,经济损失较轻。本文从地震应急响应、现场震害调查、建筑物破坏情况调研、烈度评定、灾害损失评估等方面对本次地震震害特点进行分析总结,对造成震害的致灾因素进行深入分析,得出震害经验和相应的防震减灾启示,以便本地区查找防震减灾不利因素,进而采取属地化措施,尽可能减轻未来地震灾害损失。  相似文献   

Model tests on performance of offshore wind turbine with suction caisson foundation in sand     

Hai-lei Kou  Dan-liang Yang  Wang-chun Zhang  Yi-fan Wu  Qiang Fu 《Marine Georesources & Geotechnology》2020,38(8):980-988

Abstract

The performance of steel caisson during and after installation with different penetration velocities in medium dense sand is presented. The applied jacking forces, the amount of formed soil heave and bearing capacity were measured in the model tests. The influence of penetration velocities on jacking forces, soil heave and bearing capacity were also discussed in detail. The results indicated that the jacking forces for caisson in medium dense sands were significantly affected by the penetration velocity. The larger the penetration velocity, the more soil flowed into the caisson cavity during installation. This will lead to larger inner shaft resistance and in turn more jacking forces required for the same penetration depth. The height of soil heave during installation increases with penetration velocity. The m value calculated by the ratio of the volumes of the soil heave to that of the penetrated caisson wall can be used to evaluate the soil heave. The larger the applied velocity, the larger the m value and larger bearing capacity of caisson after installation. The relationship between the m value and penetration velocity can be used to control the soil heave for a steel caisson with a wall thickness to external diameter ratio of 4.2% in medium dense sand by jacking method.  相似文献   

扬子克拉通埃迪卡拉系陡山沱组构造-岩相古地理恢复及油气意义^*     

周晓峰  杨风丽  杨瑞青  寇晓虎  庄圆 《古地理学报》2020,22(4):647-662

近年来,随着扬子克拉通埃迪卡拉系陡山沱组页岩气勘探获得重大突破,深入和细化陡山沱期构造-岩相古地理就显得迫在眉睫。基于大量野外露头和最新钻井资料,结合前人研究成果,作者对陡山沱期构造-岩相古地理进行了分析、研究和图件编制。研究认为: 扬子克拉通埃迪卡拉纪陡山沱期,受控处于罗迪尼亚超大陆西北边缘的古地理位置和超大陆大规模裂解之后的热沉降作用初期的成盆构造环境,其古地理特征总体呈现出西高东低、北高南低,四古陆剥蚀区(汉南、康滇、牛首山和江南古陆)、三台地区(上扬子、中下扬子和浙北台地)与四盆地区(扬子东南缘与北缘坳陷、万源—达州和湘鄂西内裂陷)相间的沉积面貌和格局。其中,台地区以局限—开阔台地,盆地区以台缘斜坡、陆棚和半深海等为主要优势相。4个古陆是扬子陡山沱组主要的碎屑物源区,下伏裂谷盆地构造和陡山沱期发育的同沉积断裂,共同控制了埃迪卡拉系陡山沱组构造-沉积特征。提出陕南、川东北、鄂西和湘黔渝临区是最有利的陡山沱组烃源岩分布区,其次是浙北—皖南地区。有利烃源岩分布区及其邻区是扬子深层—超深层常规天然气或页岩气勘探值得高度关注的区域。  相似文献   

河北昌黎地震台地电阻率异常分析   总被引：1，自引：1，他引：0  

乔子云  张国苓  茅远哲  贾立峰  寇海川  周剑青  佟鑫 《地震地磁观测与研究》2019,40(1):85-90

河北昌黎台地电阻率EW测道2017年6—8月出现快速下降变化,经检测,观测系统工作正常。通过环境调研和辅助资料对比分析,发现该变化与降雨和粉丝厂干扰有一定关系。采用褶积滤波法去掉降雨干扰,EW测道地电阻率仍为下降趋势,说明该下降变化不能完全用降雨来解释,不排除是地震前异常变化的可能。  相似文献