Analysis on Effect of Traffic Loads on Landslide Stability

In the design of landslide control engineering,the effect of traffic loads has not been taken into account.The authors simplified the traffic loads as mobile dead loads and traffic dynamic load.The mobile dead load ranges from 2.34 to 6.41 kPa.The impact coefficient was chosen to denote the traffic dynamic load and ranges from 0.1 to 0.4.Using several stability analysis methods widely accepted by engineers,combining two analysis samples,by the contrast of stability tests with and without consideration of the mobile dead load or the traffic dynamic load,the authors found that when the traffic load is not taken into account,the stability coefficient of shallow layer landslide(<8m) is overrated by 4.3-11 percent or 5.8-12.1 percent in comparison with the case when the mobile dead load or traffic dynamic is taken into account respectively,that is,the influence of mobile dead loads and traffic dynamic load is cannot be neglected.In case of medium deep layer landslide or the road is passing through the anti sliding section,the influence of the traffic load is a little and can be neglected.     

Monitoring and deformation analysis of pushed landslide changing water level in the Three Gorges reservoir

The typical pushed landslide deform becomes stronger when water fills in the Three Gorges reservoir. In order to better recognize the landslides deformation characteristics and prevent the disaster by the water change regulation, the paper takes an example of the features of geological conditions and deformation of Liangshuijing landslide in Yunyang which is the typical pushed landslide in the Three Gorges reservoir, and designs monitoring project. Through monitoring data including the surface displacement, ground fissure, deep displacement, ground water level, rainfall and macroscopic patrol, the variety law and relationship among monitoring data are obtained. The regularity of landslide deformation and its deformation velocity are concluded when the variation of the rainfall and water level change. Combined the variation of bands-stabilization coefficient, deformation laws of the pushed landslide by the rainfall or the reservoir water are obtained. The deformation caused by rainfall is large in the back landslide, while the deformation caused by hydrodynamic pressure is large in the front landslide. The higher the water level, the severelier of the influence. The deformation is largely influenced by hydrodynamic pressure when reservoir water declines sharply in the front landslide, and the deformation is the largest when rainfall and reservoir sharpe water decline happened simultaneously in the whole landslide. The law provides scientific basis for reduction and prevention disaster of the pushed landslide.     

Characteristics Analysis and Control Studying About Panluo Iron Ore Mine Landslide

An analysis about development characteristics of Panluo iron ore mine landslide has been made, and main factors for landslide stability have been gained. According to these factors and development laws of the landslide, some reasonable control measures are put forward, the landslide has been controlled readically after these measures implemented.     

Experiment Study on Soil Properties of Shennv Stream Landslide in Wu Gorge

Accurate obtainting soil parameters of landslide is the key links for landslide stability evaluation and project management . This article takes Shennv Stream landslide in Chongqing Wushan County as an example, implementing unconsolidated and undrained shear test and mineral composition analysis by X ray diffraction for soil in different elevations of landslide ,conducting sensitivity test for various soil parameters of reservoir landslide change with different water level.Study shows that : Mineral composition of soil mainly contains Calcite, Quartz and clay mineral. Hydrophilic minerals in clay mineral have great effect on stability of landslide. Shear strength decreases by influence of water content on cohesion. Cohesion decreases sharply in a quadratic function relation with water content increasing .When water content comes to 18.21% ,change of cohesion tends to be stable.But the internal friction angle of landslide soil decreases linearly in small amplitude with an increase of water content. Research results may provide some important references for rationally choosing strength parameters of soil in similar landslide.     

Solution for One-Dimensional Contaminant Diffusion in Layered Clayey Soils Using Laplace Transforms

Contaminant diffusion in layered soil is very complex. The diffusion process is simplified as a one-dimensional diffusion mode. The Laplace transformation and Laplace numerical inverse transformation are adopted. The proposed solution can be degraded to a single layer case. The obtained results are well consistent with those obtained by the classic theory. The correctness of the presented solution is verified by comparing the calculation results with the results generated by existing numerical software. One case study is conducted and the calculation results have a good agreement with measured data, which prove the reliability of the proposed method. The presented method can be used to solve more complex boundary conditions of contaminant migration.     

低功耗粮情测控物联网模型研究

以储粮粮情测控为研究背景,以降低粮情测控系统功耗为目标,提出了一种低成本、低功耗、可扩展的弹性粮情测控物联网模型。粮情测控物联网模型包括三层结构:感知层、传输层和汇聚层。感知层支持多参数粮情数据感知;传输层多跳传输粮情数据;汇聚层兼容GPRS、WIFI、WLAN、3G、Enthernet等通信方式,系统结构灵活,扩展性强。实验验证,该模型相较于传统的WSN至少可以延长粮情测控系统的寿命,粮情感知节点在不更换电源情况下可以工作3~5年。     

中国农业战略环境评价研究进展

农业战略环境评价是指对农业法规、政策、规划和计划等战略实施后可能造成的环境影响进行分析、预测和评估,并提出相应的预防或者减轻不良环境影响的对策和措施,进行跟踪监测的方法和制度。它是从源头上控制农业污染、协调环境与农业可持续发展的决策手段之一。对我国农业战略环境评价研究进展进行总结,有利于了解环评法实施前后我国农业战略环境评价的发展情况,为更进一步做好农业战略环境评价工作奠定基础。本文从研究总体概况、评价的必要性、评价的基本程序、评价指标体系的构建、评价方法等方面对中国农业战略环境评价研究的进展进行了综述,并对现有研究实例进行系统总结。     

饱和渗透系数空间变异性对边坡稳定性的影响

研究了降雨雨型、雨强和持时对边坡孔隙水压力分布的影响以及降雨入渗条件下饱和渗透系数的空间变异性对孔隙水压力、含水率、抗剪强度参数、局部安全系数等参数空间分布的影响。研究结果表明,降雨特性对边坡孔隙水压力的影响较大;受渗流主方向影响,降雨条件下饱和渗透系数的水平波动尺度对孔隙水压力及含水率的变异性影响小于竖向波动尺度,降雨致滑坡的临界滑面基本与坡面平行且深度较浅;随着饱和渗透系数水平波动尺度的增加,滑坡深度随之增大,从总体上坡体上部局部安全系数随饱和渗透系数竖向波动尺度的增加而减小。     

Recent Research on Supervision Running State of the Tuyere and Raceway in Blast Furnace

The manipulators pay fully attention to the running state of raceway looked into tuyere peehole in blast furnace in its production process. And it is important for judgement and control the blast furnace. The pulverized coal feeding and burning cases can be supervised by peehole in tuyere. Temperature distribution can be studied by brightness and numerical simulation of pulverized coal combustion. The recent research of temperature examined and supervision technique of the tuyere and raceway in blast furnace are set forth at home and abroad. A method settling supervision and control the state of tuyere and raceway in blast furnace is put forward by coalescent numeric image process technique to numeric simulate two dimensional imaging technique.     

CFRP加固冷弯薄壁C型钢长构件的轴压承载力

为了研究CFRP加固冷弯薄壁C型钢长构件的承载能力,对腹板和翼缘均粘贴CFRP的试件进行了轴心受压加载试验。7根长度均为1 400 mm的试件,其中1根为未加固的控制试件,其余6根封闭缠绕外贴50 mm宽CFRP间距为50、100、150 mm 3种情况,层数为1层和2层。试验结果表明,在轴心荷载作用下的破坏模式为整体弯扭失稳,与控制试件相比,加固后试件的稳定极限承载力均有不同程度的提高;当CFRP间距与腹板高度的比值小于1时,加固效果较理想,且2层CFRP的加固效果好于1层。最后,采用有限元对模型进行数值模拟,对比试验数据和数值模拟结果,二者吻合较好。     

基于web的农产品安全生产组态软件

提出了以SVG作为监控图片格式,Ajax作为客户端与服务器通信机制构建基于Web的农产品安全生产图形组态软件的方法。详细介绍了系统的整体结构,系统的主要功能模块的设计及具体实现,并介绍了系统实现过程中的关键技术。农产品安全生产组态软件不仅可以实现农产品生产过程的实时监控,而且还为生产预警提供依据。     

Stability assessment method for small and medium potential landslides and results analysis

Small and medium landslides are widely distributed, the prediction mainly relies on the monitoring and controlling systems executed by the masses. The advantages and disadvantages of various stability assessment methods are compared. The engineering analogy method accords with the requirements for small and medium landslide assessment. A method is illustrated based on Fisher discrimiant function to cope with the small and medium potential landslide stability assessment. The impact factors of landslides is explored with the historical data. The stability is taken as a multi-dimensional statistical variable and project into one-dimensional straight line. Distance discriminant method is used to construct a classification criterion. The applicability of this method is explored, and assessed the landslides in Chongqing Wulong by this method. The results show that accuracy of this method is about eighty percent. This method is suitable for the city of Chongqing or other areas with the similar geological environment.     

分期播种对陇东地区玉米产量的影响及适宜播期分析

为了应对气候变化,探讨气候变化对玉米播种期和产量的影响,达到趋利避害,提高气候资源利用率的目的,采用分期播种方法,对陇东地区玉米最适播种期进行研究。结果表明,玉米不同播期各发育期生长速度变化主要表现在苗期,播种较早的发育期生长速度慢,发育期间隔天数长;播种较迟的发育期生长速度快,发育期间隔天数短;不同播期各发育期干物质增长量的差异主要表现在生殖生长期,干物质增长量以第三和第二（对照）播期最高,而营养生长期各发育期干物质增长量差异较小;不同播期不同层次的土壤贮水量对产量的影响不同,无论是浅层（0~50 cm）还是深层（0~100 cm）土壤贮水量在出苗-拔节期对产量的贡献呈正效应,在抽雄-成熟期和播种期对产量的贡献呈负效应,且以浅层（0~50 cm）土壤贮水量对产量的影响较大;同时分析表明,以第三播期（4月22日）为最适宜播期,该生长期内光、温、水匹配好,干物质增长量最高,产量也最高。说明近年来气候变化使陇东地区玉米适宜播种期推迟,由之前的4月中旬推迟至4月下旬。     

An improved localization algorithm based on RSSI for landslide monitoring

In order to overcome the existing problems of low automation, high cost and difficult to implement in the area of landslide monitoring, this paper presents a new method of RSSI (Received Signal Strength Indicator)based positioning technology without any one-off instruments to monitor landslide surface displacement. By adding weighted factors, the improved positioning algorithm can estimate the parameters of the path loss model dynamically and calculates the communication distance of network nodes in real-time, which can improve positioning precision and reduce the impact of environmental changes on it. The MATLAB experiments show that, compared with the traditional RSSI based localization algorithm using fixed pass loss model, the improved algorithm could significantly reduce the average error.     

天安门融雪剂次生盐害土壤的防治与监测

为了减轻氯盐类融雪剂对生态环境造成的污染,节约由此产生的土壤治理修复费用,针对天安门广场油松土壤的融雪剂次生盐害问题,采用铺设吸附层的方式进行了土壤防治工作。吸附层由海泡石绒、沸石、腐殖质3种吸附性材料组成,具有吸附融雪剂中Na+、Cl-等无机离子的作用,分别对铺设吸附层前后的土壤采样分析。结果表明：吸附层对土壤的pH、EC值有明显缓冲作用,可有效吸附融雪剂中Na+、Cl-,但对Cl-可能存在吸附量上限。后续的土壤监测表明,天安门广场地形及车辆行人等因素对土壤EC值有一定影响。吸附层能够吸收氯盐类融雪剂中的无机盐离子成分,在一定范围内可有效防止氯盐类融雪剂对油松种植土壤造成的次生盐害问题,改变污染状况。     

肉干生产的霉菌污染及其防治

肉干是一种深受消费者喜爱的肉制品。这类食品含有丰富的营养成分,是微生物生长繁殖的良好环境。近年来,肉干微生物污染事件时有发生,且由于肉干变质而退货,对食品加工企业造成巨大的经济损失。分析了肉干生产中易引起霉菌污染的环节并提出预防和解决措施。     

贵州省马铃薯晚疫病数字化监测预警系统建设与应用

2010-2014年,贵州省实施马铃薯晚疫病预警与控制技术研究示范项目,通过从比利时引进马铃薯晚疫病数字化预测模型,购置马铃薯晚疫病监测仪,建立晚疫病监测点,建成了贵州省马铃薯晚疫病数字化监测预警系统,范围覆盖30个马铃薯主产县（市、区）.系统可对监测点气象数据自动采集分析,实时提供侵染曲线,并在地图上直接显示预警.通过应用表明,系统预测发病时间和田间实际相吻合,可有效指导防治工作,并按照推荐药剂和防治方法,示范区防治效果达80.7％.     

5种药剂防治玉米茎基腐病、丝黑穗病药效试验

5种种衣剂防治玉米茎基腐病、丝黑穗病田间药效试验。结果表明：Lamardor400FS、Baytan Plus200FS、立克秀60FS对玉米茎基腐病和丝黑穗病均有很好的防治效果,防效在72.3%~94.0%;卫福400FS和满适金35FS种子对玉米茎基腐病有较好的防治效果,防效在76.2%~80.0%,而对玉米丝黑穗病防治效果较差。各药剂均能显著提高玉米产量。     

Factors Influencing Deformation of Underground Diaphragm Wall in Deep Excavation Based on Centrifugal Model Test

To know well the impact on the deformation of underground diaphragm wall caused by soil excavation, centrifugal model tests reflecting Shanghai soft soil creep effects were designed, and finite element was used to calculate the deformation of underground diaphragm wall caused by different excavation timeline, sequence and width based on the top down construction method in the deep and large foundation pit of Shanghai Expo axis underground complex project. Centrifuge model tests and monitoring data indicate that the results of numerical calculation are approximately close to the horizontal displacement of the underground diaphragm wall measured in site, which reflects the deformation behavior of excavation. The results show that remained berm and middle plate have good control over the deformation of underground diaphragm wall. Most part of underground diaphragm wall deformation caused by soil creep occurs after the remained berm is excavated. So in order to decrease the deformation of underground diaphragm wall, it would be useful to conduct plate structures as soon as the remained berm is excavated. The excavation width of remained berm in the north part is less than that in the south part. It will be advisable to finally excavate the remained berm where there are protected objects nearby.     

农产品安全生产和监控关键技术研究进展

基于“需求、亟待解决的问题、关键技术筛选”的思路,分析了中国农产品安全需求,提出了中国农产品安全生产和监控中存在的若干关键问题;归纳了作物新品种选育技术、农业投入品安全技术、现代设施农业技术、农产品安全监控信息化和智能化技术、农产品绿色贮藏技术、快速检测技术和农产品安全溯源技术在农产品安全生产和监控中的应用;并探讨了安全生产和监控关键技术在中国农产品领域的应用前景。