摘要：协同过滤算法是解决信息超载的关键技术之一,但仍存在预测不准确的问题。因此,在分析了Spark技术及框架并阐述了slope One算法不足的基础上,针对项目与用户间的相似性提出了一种改进的slope One算法,并在Spark平台上实现了该算法。实验证明,改进后的slope One算法具有更高的预测准确性,且在Spark平台上实现了并行化操作,用Speedup和Sizeup方法证明了算法的并行性、扩展性良好,提高了算法的效率。

摘要：The research introduced the flowchart of organic-material and plant seeds spraying and a case of ＆quot;Dasi＆quot; Highway, the highway from Daxing to Sinan in Guizhou Province, a part of a National Highway from Hangzhou to Ruili, cal ed Hangrui Highway, slope protection. The flowchart included slope cleaning, net preparation, anchor fixation, adding vegetation-growth plate, spraying organic materi-als, coverage of non-woven fabrics, and maintenance. The technique is proved much efficient in protecting and greening road sideslopes consisting of weathered rocks or hard rocks, which provides a solution for abrupt slope greening technology.

摘要：Physical model test is an effective way to unveil the dynamic response of a slope under seismic *** similarity design is the key of physical model *** isolated similarity design method for shaking table tests was proposed and verified in this *** this method,the relevant physical quantities were divided into several subsystems and subcharacteristic equations for each subsystem were then established based on the Buckingham similarity ***-scale shaking table tests on a reinforced slope were adopted herein to illustrate the application of the proposed isolated similarity design *** similarity system for the studied slope was divided into four parts in the process of similarity *** geometrical dimension L,densityρand gravity g were selected as fundamental quantities for the similarity design,and four subcharacteristic equations were established for each *** dynamic responses of the recorded acceleration and axis force show that the seismic waves propagate well in the model *** proposed isolated similarity design method solves the conflict between the similarity requirement for all relevant physical quantities and the difficulty of test model fabrication to satisfy all similarity relations.

摘要：The Mongolian Plateau,a vital ecological barrier in northern China,is of great importance for studying vegetation dynamics in Mongolia against the background of climate *** studies can enhance our understanding of regional vegetation responses to global warming and contribute to the establishment of a stronger ecological barrier in northern ***,we analyzed the spatial and temporal characteristics of the NDVI(normalized difference vegetation index)in Mongolia using 8 km resolution GIMMS NDVI3g data from 1990 to 2022,along with temperature,precipitation,and elevation *** analysis and correlation methods were used to examine the relationships between the NDVI and temperature,as well as *** results showed four important aspects of these relationships.(1)The NDVI in Mongolia increased significantly from 1990 to 2022 at a rate of 0.0015 yr^(-1)(P<0.05).(2)Mongolia’s NDVI increased from 1990 to 2022 in 60.73%of the *** this total,the area with a significant increase accounted for 31.67%and was concentrated on the eastern and western *** area experiencing a significant decrease accounted for 15.67%and was mainly located on the southwestern edges.(3)The NDVI analysis revealed significant increasing trends in all regions except for those at elevations of 1500-2000 *** greatest rate of increase was observed between 500 and 1000 m,and the increasing trend weakened as elevation continued to increase before gradually becoming significant ***,the NDVI increased significantly across different slopes,and the rate of increase decreased as the slope increased.(4)From 1990 to 2022,Mongolia’s NDVI was mostly negatively correlated with *** occurred over 66.75%of the total land area,with 17.21%of the region exhibiting a significant negative correlation,mainly in the ***,the NDVI demonstrated a positive correlation with precipitation,encompassing 86.71%of the total land *** 4

摘要：针对路基边坡浅表层滑塌防治问题,优化设计出一种基于生态固土保湿的活木桩骨架植草护坡结构,采用数值方法,分析了该结构在不同桩参数、坡参数条件下边坡稳定性变化特征。计算表明,桩长和间距对固坡影响显著,桩径和植入角在合理区间内不敏感,护坡效果与坡率正相关、与坡高负相关。对活木桩相关技术参数优化得出,最优桩长为2.0-3.0m,最佳桩径为7.0-15.0cm,最优间距为2.0m左右,最优植入角与坡面近似垂直,最优坡率为1.0∶1.0-1.0∶1.5。

摘要：应用Visual slope 6.0对晋北地区临近铁路的一栋31层商住楼深基坑工程进行土钉支护内力和变形分析,对6种基坑土钉支护设计方案进行数值模拟,优化了土钉支护设计参数。数值分析结果表明:土钉间距、直径和长度对基坑安全系数影响较大,施工设备和经济条件允许时,应在保持一定的土钉密度的基础上,适当增加土钉直径和长度,以便有效提高土钉支护结构的安全性。实践证明土钉支护技术适用于晋北地区的工程地质条件。

摘要：台阶法作为加强贴坡路堤稳定性的方法被广泛应用,而台阶的适用条件和台阶型式是其设计中的重点,对此相关设计规范中对此并无详细描述.结合高速公路建设实践,采用数值计算软件FLAC对岩质贴坡路堤的台阶设置进行模拟,通过对不同工况的岩质贴坡路堤稳定性计算,归纳总结出台阶的适用条件和台阶型式,计算结果显示:岩质斜坡地基上台阶设置主要针对滑动破坏为整体滑动和折线型滑动,对于圆弧形滑动,即填方内部破坏则影响不明显;在不同斜坡坡度下,岩质斜坡地基上填方路堤极限承载力随台阶宽度的加大而增加,挖台阶与否对其极限承载力的影响较大;台阶的宽度大于1m时,台阶宽度对其极限承载力影响不明显.

摘要：长河坝水电站工程是大渡河梯级开发中的第10级电站,大坝右岸以1 485 m高程为界分为坝肩开挖和基坑开挖,坝肩边坡最大开挖高程为1 791 m,最大开挖高度306 m(计算至1 485 m高程),开挖厚度15～40 m。右岸高边坡开挖施工条件复杂,经分析,按照钻孔、爆破和开挖甩渣分两个工序循环施工。目前长河坝电站工程右岸坝肩已开挖至坝顶1 697 m高程,工程进度和安全均处于可控状态。这表明施工场内交通布置、开挖施工程序(包括浅层支护、深层支护滞后开挖面高度)、爆破设计参数等的选择是合理、有效的,可供其他类似工程借鉴。

摘要：南水北调中线干线京石段应急供水工程中4标及S34标石渠段衬砌属陡坡薄壁混凝土衬砌,采用常规方法衬砌存在弊端。经过不断比较和研究,最终创新出适合此类陡坡薄壁混凝土衬砌施工的自行滑模台车施工技术,将传统滑模与自行轨道台车相结合,通过滑模技术解决陡坡混凝土成型难的问题,利用自行轨道台车解决施工效率低的问题。实践证明,其施工质量优良,满足设计要求,技术经济效果良好。该技术方案填补了我国大型渠道机械化衬砌技术的欠缺,在大型渠道陡坡薄壁混凝土衬砌施工中具有很好的推广价值和前景。

摘要：膨胀土(岩)是一种多裂隙性、胀缩性地质体,其黏土矿物具有强亲水性,土体胀缩作用对渠道工程具有严重破坏性。因此,在对膨胀土渠坡监测过程中,除传统的渠坡变形等监测项目外,土壤含水量、吸力等是一个新的重要监测量,此外,膨胀土(岩)受含水量变化产生的反复胀缩变形以及开挖和降雨等因素引起的变形规律的研究,都是传统监测方法和手段无法完成的任务。研究提出了一种基于传感器、互联网、土木工程和计算机等技术的渠坡位移、水位、水分、水势、土温、气温、降雨量以及坡面梁结构钢筋计等多传感器的自动化综合监测系统。实现对膨胀土(岩)渠坡(或边坡)进行实时在线自动化监测、无线数传、数据的电脑和手机客户端管理与浏览以及预警等功能,为研究膨胀土(岩)渠坡变形破坏机理及处理设计有效性评价提供了基础资料和依据。