非稳沉采煤沉陷区生态修复探讨

以淮南市为例分析非稳沉采煤沉陷区的地表沉陷及其对生态环境影响,充分、科学、合理的利用沉陷区受损废弃的水土资源,将生态重构与环境治理修复及农业发展紧密结合,在调查分析淮南市土地沉陷与治理现状的基础上,提出非稳沉采煤沉陷区生态重构应遵循的基本原则,探索非稳沉采煤沉陷区生态修复、生态农业及生态景观的构建模式,力求实现生态环境修复与农业发展和生态景观的优化耦合,促进生态功能提升,为安徽省乃至全国同类地区的生态修复提供示范。     

Contrast Analysis of the Reinforcement Effect of Pile-Net Composite Foundation

To investigate the effect of consolidation soft soil, three groups of model tests were designed. The first group was PVC pile-net composite foundation, the second was pile-cap-net composite foundation, and the third was PVC and sand pile composite foundation. Butter was coated and plastic membrane was covered on inner side wall of model cast to reduce border effect. The gauges were glued with epoxy on the surface of the model with PVC piles and geogrids to measure the stress of PVC piles and geogrids. Soil pressure cells were installed in the middle of piles and the top of the sand piles, and dial indicators were installed in the middle of road and road shoulder to measure deformations. It is that shown: 1) as for the distribution of the road settlement and the differential settlement, the settlements of the third group are the largest and those of the second group are the least; 2) in terms of the stress ratio of PVC pile and soil, the values of the first group and the third group are similar, while the value of the second group is much larger; 3) the change of geogrid strain is disorderly. There are periodic peaks in the strain of geogrid of pile top and periodic troughs in the soil between the piles. The geogrid strain of the second group measured in the corresponding spot is much larger than those of the other two groups. The results of three groups of tests illustrate that if the condition is permitted, it would be the best to adopt the scheme of pile-cap-net composite foundation, which has better reinforcement effect for soft soil.     

Effect of Reinforcement Beam Sticking Different Layers Steel

This paper constituted the FEM(finite element method) model of sticky steel reinforcement beam and the model was used to analyze the reinforcement effect of the beam sticking different layers'' steel plate. The result shows two layers of steel is better than others, which agrees with theoretic analysis. It illuminate that the FEM model is in point for sticky steel reinforcement beam without crack.     

Laboratory Experimental Analysis of Foundation Treatment Using Vortex Squeeze Expansion Mechanism

The advantages and disadvantages of existing methods of foundation treatment were analyzed. The “vortex squeeze expansion mechanism” was proposed and tested in the laboratory. The self-designed vortex squeeze expanding environment box and steel casing were used to implement the vortex squeeze expanding experiment. The vortex pressure blade in the steel casing can squeeze the flowing concrete into the surrounding soil medium smoothly. The expanded diameter ratio was defined. The expanded diameter ratio conditions of sandy soil and clay under different torque and the ultimate torque were presented. The concrete flow analysis model and dynamics model of concrete in the vortex pressure chamber was established based on the analysis of flow patterns that occurred during the vortex compressed concrete. The results indicate that it's feasible to use the method of vortex squeeze expansion to handle foundation, it have strong applicability. Vortex squeeze expansion mechanism will bring new vitality for the foundation treatment methods.     

Study on Effect of Longitudinal Reinforcement Ratio on Shear Behavior of Restrained Beams with Web Reinforcement

In this paper, five restrained beams with web and different longitudinal reinforcement ratio as well as above longitudinal reinforcement truncated were tested under static point loads. On this basis, the overall process of cracking development under shear and the effect of longitudinal reinforcement ratio on shear strength was investigated     

Mechanism Analysis of Wall Crack and Method of Reinforcement on Isolated Foundation House

The machanism analysis for production of wall crack about a masonry construction building, based on the wall's stress alternation is given and is verified by the numerical method.Then,a method of reinforcing foundation and wall is introduced.     

A Numerical Simulation of Two-Dimension PoissonProcess and its Application in Simulation of an Uneven Road

An attempt is made to develop a numerical simulation rnodel of two-dimensionpoisson prcoess. Simulated and checked on computer,the road surface and spectrum of the roadwhich close to the ISO,The methed developed in this pa per is proved to be feasible and practicable.     

Effect of Varying Longitudinal Reinforcement Ratios on Shear Behavior of Reinforced Concrete Beams Without Web Reinforcement

Effect of varying longitudinal reinforcement ratios on shear behavior of reinforced concrete simply supported beams without web reinforcement was analyzed in this paper, with emphasis on both shear ultimate capacity and failure mode, on the basis of available testing data. Generic laws were thus obtained and codified methods, including ACI Code and China Design Code of Reinforced Concrete Structures, were evaluated as a result.     

红旗煤矿开采沉陷土地生态服务价值影响

为研究因煤矿地下开采造成的地面沉陷程度及其土地生态服务功能价值影响,首先利用FLAC模型对地面沉陷进行定量预测,根据地面沉陷预测结果基于GIS技术对因地面沉陷造成的土地生态服务价值进行定量分析、估算。研究结果表明：全井田最大下沉值为3 590 mm,最大倾斜值为71.8 mm,最大曲率值为2.18×10-3/m,最大水平变形值为27.3 mm/m,最大水平移动为898 mm,地表沉陷面积为8.09 km2;将导致土地生态服务价值损失537.11万元。     

基于土地整治的采煤区生态服务价值评价

以采煤沉陷区为研究对象,分析采煤沉陷区土地利用和损毁情况,并通过生态系统服务价值(ESV)指标对土地整治效果进行评价。结果显示,通过土地整治工程,耕地面积由220.24 hm2增至311.08 hm2;采煤沉陷区总生态服务价值属于正向变化,由整治前的348.03×104元/年,增加至到整治后的356.67×104元/年;采煤沉陷区各单项生态服务价值有正向的,也有负向的。其中,属于正向影响的有气候调节、水源涵养、废物处理、食物生产和原材料;属于负向影响的有气温调节、土壤形成与保护、生物多样性保护和娱乐文化。土地整治改善农业基础设施条件和修复并重构生态环境,进而增加社会经济效益和生态效益。     

Analysis on Foundation Pit Deformation of a Commercial Building in Hangzhou

The foundation pit deformation of a commercial building in Hangzhou is calculated by using calculation method related to foundation pit deformation. The calculation results by m method show that the maximum deformation is 29.2mm and the real maximum deformation is 174.6mm. The deformation character obtained by foundation coefficient method is different from the real deformation. There are lots of factors influencing foundation deformation. According to practical engineering condition, in this study, the influencing factors for soil parameters, bracing condition, condition for insertion of retaining wall into soil and construction speed are determined. The calculation method used is analyzed and modified. Finally, a useful and valid method for calculating foundation deformation is presented, by which the foundation pit deformation in practical project can be forecasted and analyzed.     

Investigation on Shear Strength of Reinforced Concrete Beams without Web Reinforcement

On the basis of available testing data of simply supported reinforced concrete beams without web reinforcement under two-point concentrated loads,the dominant factors contributing to shear performance are identified,and the basic laws are correspondingly quantitatively described.The shear design equations of China Design Code of Reinforced Concrete Structures,ACI Code,together with two other expressions of shear of RC beams without web reinforcement,are thus calibrated to identify their accuracy in describing the shear mechanism of such members.     

微生物菌剂处理猪场沼液效果研究

利用人工模拟活性污泥的方法,比较研究不同微生物菌剂对猪场沼液的净化效果,旨在研制适合处理猪场沼液的复合菌剂,为养殖废水无害化处理和资源化利用提供科学依据。试验结果表明：3种微生物菌剂对猪场沼液均具有一定的净化效果,能够较好地去除沼液生物需氧量、总磷、粪大肠菌群,最高去除率分别达到61.5%、83.0%、99.0%,发芽试验也证实植物毒性的良好去除效果,最高发芽率提高38.3个百分点,发芽指数提高45.2个百分点;对化学需氧量、氨氮、全盐量等指标均具有一定的去除效果,最高去除率发分别达到54.9%、48.4%、31.8%。综合评估,光合菌剂（PMP）处理效果优于复合菌剂（CMP）和发酵菌剂（FMP）。     

植物根系固土力学机制模型

由于在边坡加固、生态环境保护等方面具有很多优越性,植物固土护坡技术近年来广泛应用于固土护坡工程中。植物固土护坡的力学效应主要体现在植物的根系上,包括植物浅根将岩土体变成加筋复合材料的加筋作用,以及深根将浅层岩土体风化带锚固到深层稳定岩土上的锚固作用。为了揭示并评价植物固土护坡的力学效应,需要具有实际应用价值的根系固土力学机制模型。本研究在分析植物根系固土力学机理的基础上,探讨了3个植物根系固土力学机制模型：Wu氏模型、能量法模型和纤维束模型的应用条件、模型的优缺点、适用范围及其环境适应性等,并展望了植物根系固土力学模型发展的趋势和方向,从模型角度深化植物根系固土力学机制理论研究,为全面揭示植物护坡的力学机理提供理论基础,为水土保持工程植物措施提供科学依据和理论指导。     

Consideration of External Prestressing Technique Applied to Bridge Reinforcement

The external prestresing technique has become an important method since it was used in the reinforcement of the upper structure of existing bridge. In this paper, the advantages and disadvantages of this method in brief are introduced and emphasis is put on the consideration and progress of its application.     

The Calculation on the Size of Foundation Basein Reinforced Concrete Single-Foundation under Column

This paper discusses the size of foundation base in reinforced concrete single-foundation under column.The two kinds of direct-calculating formulas have been derived. They are simple and helpful.They can be easily used in foundation design.     

热水处理对木纳格葡萄保鲜效果的影响

研究了热水处理对轻度加工木纳格葡萄贮藏保鲜效果的影响。试验结果表明,45℃条件下8min热处理能够明显地降低果实腐烂率,抑制葡萄相对电导率的上升与果肉硬度、CAT活性下降,提高果实的POD活性,从而提高葡萄果实贮藏品质与延长货架期。