Construction and stability of an extra-large section chamber in solid backfill mining

In solid backfill mining without gangue removal, the gangue is separated directly underground and backfilled into goaf. This necessitates the underground construction of an extra-large section chamber for separation equipments. For the construction of an extra-large section chamber in the Tangshan mine, we proposed an active support through a combination of bolting, anchor cables, lining, and a reinforced chamber floor by inverted arch pouring. ABAQUS software was used to analyze the surrounding rock deformation and the plastic zone development of the chamber under different excavation schemes.The best excavation scheme was determined, and the effectiveness of the combined supports was verified. In practice, the engineering installation showed good overall control of the movement of the surrounding rock, with roof-to-floor and side-to-side convergences of 154.6 and 77.5 mm, respectively,which meets the requirements for underground coal gangue separation.

Study on Safeguard System of Eco-tourism Compensation of Hukou Section during Ecological Water-control Project of Poyang Lake

Through analysis on the background to develop eco-tourism and necessity for ecological compensation,based on specific condition of Hukou County,in line with the situation to develop eco-tourism during ecological water control project of Poyang Lake,residents' interest protection system and ecological benefit safeguard system for eco-tourism compensation were put forward.

Penalty model for delay of bidding section construction period in South-to-North Water Diversion Eastern Route Project from perspective of programs

According to the multi-project and program management theory, this paper analyzes the program generation principle and establishes a program based on progress goals. On the basis of the present situation of calculation of penalty for delay of the bidding section construction period with the critical path method, we studied the effects of contractor-induced delay of the bidding section construction period in detail, including the effects on the construction period of the bidding section itself, the earliest start times of the next bidding section and other subsequent bidding sections, and the construction period of the program, and then constructed a penalty model for delay of the bidding section construction period from the perspective of programs. Using the penalty model, we conducted a practical analysis of penalty for delay of the construction period of the Baoying station program in the South-to-North Water Diversion Project. The model can help determine the amount of penalty for delay of the construction period in bidding sections scientifically and reasonably,

Calculation and Illustration of Section-Projection Diagrams of Quasicrystals

On the basis of cut and projection description of quasicrystals, a method for calculating section projection diagrams of quasicrystals is developed and applied to decagonal quasicrystals. Firstly, a section projection diagram parallel to the quasiperiodic plane of perfect decagonal quasicrystal is calculated. By using the existing elastic displacement field formulae, section projection diagrams parallel to the quasiperiodic plane of a decagonal quasicrystal containing a straight dislocation along periodic direction have been calculated when only phason strain and both phason and phonon strains are introduced respectively.

Volume Inequalities for Sections and Projections of Asymmetric Convex Bodies

In this paper,we establish volume inequalities for k-dimensional sections and projections of convex bodies(not necessarily symmetric)and their polars in a more general position than John's position.

Reinforcement Technology for Soft Soil Roadbed in the Widened Section of Expressway Expansion

This article examines the soft soil roadbed reinforcement technology for widened sections of highways in a specific project.It provides an overview of the project,the principles of soft soil roadbed reinforcement technology for wide sections,and its practical application.The analysis aims to offer guidance on applying soft soil roadbed wide section reinforcement technology and enhancing the overall quality of similar projects.

基于实景三维高分辨率地质剖面测量关键技术研究

地质剖面是地质研究的基本手段之一,随着实景三维技术快速发展,实景三维建模技术已逐渐应用于地质技术领域。笔者以数字相机、智能手机、无人机、多源遥感影像等可广泛获取的资源为基础对典型地质剖面进行实景三维模型获取和三维剖面测量研究分析,并引入投影方法和制图综合技术进行剖面测量、制图工作。与传统剖面相比,本研究地质剖面测量技术、测量成果具有严格的数学基础,工作成果具有明显的高精度、高效率等特征。因此,基于本研究实景三维地质剖面测量技术具较好的应用前景。

南水北调东线江苏段工程供水成本核算研究

围绕南水北调东线江苏段工程,基于规划与实际调水量、淮水利用比例、泵站开机等基本情况,探讨工程最新成本构成与核算方法,核算南水北调东线江苏段工程供水成本。通过分析各项费用、各个区段在单方水总成本中的占比,明晰供水成本结构特征,并对最易影响固定成本与可变成本变化的费用进行了敏感性分析,为相关供水成本体系研究提供参考。

水利高填方渠段衬砌施工技术的应用

在西北温度较低地区开展水利高填方渠段衬砌施工作业的过程中,不仅要结合施工区域的实际情况制定科学的施工方案,还要同步做好水利高填方渠段后期养护工作。文章首先分析了常见的水利高填方渠段衬砌施工技术,然后结合具体工程案例分析了高填方水利工程施工环节应用到的具体衬砌施工技术,对提升水利工程建设质量起到一定的参考和借鉴意义。

一种基于Section的水文地质钻孔综合图表绘制方法

将原始编录数据在Excel软件中进行整理,将整理后的数据通过Section软件的全部数据投影(Excel)、属性转为参数等功能达到快速制作水文地质钻孔综合图表的目的;该方法能充分利用Excel和Section的系统资源,大大缩短绘图时间,原始数据的成图避免了手工编辑的工程中可能造成的偏差,而且整个制作过程方便简洁,无需进行软件的二次开发,具有成图准确可靠、效率高等特点,实用性较强,可显著提高工作效率。

Three-dimensional reconstruction of human spinal cord based on histological serial sections

BACKGROUND： It is not possible to reconstruct the inner structure of the spinal cord, such as gray matter and spinal tracts, from the Visual Human Project database or CT and MRI databases, due to low image resolution and contrast in macrosection images. OBJECTIVE： To explore a semi-automatic computerized three-dimensional （3D） reconstruction of human spinal cord based on histological serial sections, in order to solve issues such as low contrast. DESIGN, TIME AND SETTING： An experimental study combining serial section techniques and 3D reconstruction, performed in the laboratory of Human Anatomy and Histoembryology at the Medical School of Nantong University during January to April 2008. SETTING： Department of Anatomy, Institute of Neurobiology, Jiangsu Province Key Laboratory of Neural Regeneration, Laboratory of Image Engineering. MATERIALS： A human lumbar spinal cord segment from fresh autopsy material of an adult male. METHODS： After 4% paraformaldehyde fixation for three days, serial sections of the lumbar spinal cord were cut on a Leica cryostat and mounted on slides in sequence, with eight sections aligned separately on each slide. All sections were stained with Luxol Fast Blue to reveal myelin sheaths. After gradient dehydration and clearing, the stained slides were coverslipped. Sections were observed and images recorded under a light microscope using a digital camera. Six images were acquired at x25 magnification and automatically stitched into a complete section image. After all serial images were obtained, 96 complete serial images of the human lumbar cord segment were automatically processed with ＂Curves＂, ＂Autocontrast＂, ＂Gray scale 8 bit＂, ＂Invert＂, ＂Image resize to 50%＂ steps using Photoshop 7.0 software. All images were added in order into 3D-DOCTOR 4.0 software as a stack, where serial images were automatically realigned with neighboring images and semi-automatically segmented for white matter and gray matter. Finally, simple surface and volume reconstruction were completed on a personal computer. The reconstructed human lumbar spinal cord segment was interactively observed, cut, and measured. MAIN OUTCOME MEASURES： The reconstructed human lumbar spinal cord segment. RESULTS： Compared with serial images obtained from other image modalities, such as CT, MRI, and macrosections from The Visual Human Project database, the Luxol Fast Blue stained histological serial section images exhibited higher resolution and contrast between gray and white matter. Image processing and 3D reconstruction steps were semi-automatically performed with related software. The 3D reconstructed human lumbar cord segment were observed, cut, and measured on a PC. CONCLUSION： A semi-automatically computerized method, based on histological serial sections, is an effective way to 3D-reconstruct the human spinal cord.

Section软件在土地整治项目规划中的应用研究

土地整治规划是有效整合土地资源的重要措施。目前Section软件已被引入到土地整治项目规划中。介绍了Section软件的概念和功能模块,从制作表格、加密等高线、制作图签和图例等方面对Section软件在土地整治项目制图中的应用技巧进行了探讨。

Section在地球化学找矿制图上的应用

Section是在Map Gis强大的地球信息系统基础上二次开发的小软件,它丰富了Map Gis的功能,简化了操作步骤。大量的地球化学异常数据利用Section软件进行表格数据投影、高程数据网格化、绘制平面等值线图,制成地球化学图。

Neutron time-of-flight spectrometer based on HIRFL for studies of spallation reactions related to ADS project

A Neutron Time-of-Flight(NTOF) spectrometer, based at the Heavy Ion Research Facility in Lanzhou(HIRFL) was developed for studies of neutron production of proton induced spallation reactions related to the ADS project. After the presentation of comparisons between calculated spallation neutron production doubledifferential cross sections and the available experimental data, a detailed description of the NTOF spectrometer is given. Test beam results show that the spectrometer works well and data analysis procedures are established.The comparisons of the test beam neutron spectra with those of GEANT4 simulations are presented.

On Projective Maps of Volume-Decreasing

Given a projective map F: M→N of a complete Riemannian manifold to a Riemannianmanifold with the sectional curvature bounded above by a negative constant, we prove that f decreases volume up to a constant depending only on the curvatures of M and N. This generalizes theresult due to Har’el.

引江济淮工程(河南段)水资源调配系统设计与开发

为强化引江济淮工程(河南段)水资源统一调配,基于Spring Boot和Vue前后端分离开发的模式,利用天地图API、WebGL、Echarts等技术设计研发引江济淮工程(河南段)水资源调配系统。从设计思路、功能界面、关键技术3个角度论述系统设计思路和实现过程,从而实现地理信息服务、供需水预测、水资源优化配置、水资源优化调度等功能,实现水量分配可视化、运行调度智能化和跨流域调水管控一体化。系统测试结果表明:引江济淮工程(河南段)水资源调配系统的建立提高了受水区水资源精细化管理的水平,解决了引江济淮工程(河南段)跨流域调水的配置难题,为受水区水资源高效利用提供有效的技术支撑。

基于节段模型测力方法的塔式起重机风荷载特性研究

塔式起重机被广泛应用于铁道工程和土木工程施工过程,属于高耸结构体系,风荷载是塔式起重机结构设计的控制性荷载。为完善《塔式起重机设计规范》(GB/T 13752—2017)和《建筑结构荷载规范》(GB 50009—2012)中的塔式起重机斜风向设计风荷载计算方法,解决风向、吊臂、平衡臂位置等因素对塔式起重机遮挡和干扰引起的设计风荷载计算问题。选取平头塔式起重机为研究对象,对塔身、吊臂、平衡臂进行多工况的节段模型测力风洞试验,研究湍流强度、节段干扰和遮挡等因素对塔式起重机节段风荷载特性的影响规律,研究不同风向下节段阻力系数分布规律,对比标准化阻力系数与当前主要规范的异同,进而探讨节段斜风向标准化阻力系数计算方法。研究结果表明湍流强度对节段阻力系数影响较小,可忽略,而平衡臂和吊臂相邻节段的干扰会减小测试节段的阻力系数;在斜风向下,由于吊臂和平衡臂之间存在相邻节段干扰,国内外规范方法的计算值均会大于干扰工况的节段风洞试验值;当前主要国家规范规定的垂直风向塔身、吊臂、平衡臂阻力系数与风洞试验测得的阻力系数值较为接近,基于风洞试验结果给出典型风向的塔式起重机各节段的风荷载系数取值可用于结构设计;基于风洞试验测试结果推导的塔式起重机斜风向风荷载计算方法具有较好的拟合效果。研究成果可推荐相关工程应用,可为相关规范的修改或补充提供参考。

中吉乌铁路吉国境内段限制坡度方案研究

研究目的:中吉乌铁路吉尔吉斯斯坦境内段位于天山山系南天山的西部,穿越莫尔多套山、费尔干纳山,线路跨越吐尔尕特高山区、阿尔帕高原盆地区等10个地貌单元,线路附近最高点贾曼达万山高程4 205 m,最低点贾拉拉巴德高程722 m,相对高差3 483 m,地形高差巨大,工程地质条件复杂,吐尔尕特至马克马尔段采用1 435 mm标准轨距、马克马尔至贾拉拉巴德南段采用1 520 mm宽轨距,线路限制坡度的选择是项目研究的重点和难点。研究结论:(1)结合线路沿线地形地质条件、承担运输货物特点、列车牵引质量、机车选型、工程投资和综合经济性,对限制坡度分段进行研究;(2)标轨段重点对18‰、20‰、24‰、25‰四个方案,宽轨段重点对18‰、20‰、24‰、27‰四个方案进行了分析研究,为降低工程投资、提高项目经济性、匹配运输组织、优化运输条件、保障运营安全性,推荐中吉乌铁路吉国境内段限制坡度采用20‰方案;(3)本研究思路和方法可为境外铁路工程建设提供参考和借鉴。

引江补汉工程丹江口下游近坝段枯水期通航水位恢复试验研究

引江补汉工程补水口位于丹江口大坝下游安乐河出口约5 km处,且补水量与调水量基本一致,工程对航道的影响主要体现在减水段,为恢复枯水期通航水位需要开展航道综合治理。利用河工模型试验论证了综合治理方案的效果,并对方案进行了优化及进一步论证。结果表明,减水-补水212 m 3/s方案尾门水位分别为86.47、85.90 m条件下,引航道口—黄家港段水位下降,黄家港以下水位保持不变,其中引航道口水位下降幅度最大,分别下降0.08、0.19 m;综合治理方案1实施后引航道口水位下降均为0.02 m,减水段的水位仍未恢复至调水前的水平,主因是从安乐河口补水的水流并未能进入到左侧主航道内;基于试验研究结果,建议对综合治理方案进行优化,在沧浪洲出水口下沿布置2道护底带;通过试验论证了护底带的4个高程,建议护底带高程为85.5 m,并对护底带高程进一步细化论证;优化后的方案可使引航道口至黄家港段的水位略超过调水前的水平,其中引航道口处最大水位抬高0.06 m。

超长外露锚杆无损检测方法的研究与应用

锚杆无损检测技术是利用声波反射原理检测注浆锚杆的注浆饱满度及其埋设长度的一种方法,目前已在各类支护工程中广泛应用。但当锚杆外露长度过长时,其取得的检测结果误差较大,不能准确地反映锚杆的锚固质量。硬梁包水电站地下厂房岩壁吊车梁锚杆外露长度均超过1 m,其锚杆数量多,对钻孔注浆质量要求高,阐述了对如何准确快捷地实施检测,并进行了研究分析与探讨,所取得的经验可供类似工程借鉴。