期刊：
Bulletin of Engineering Geology and the Environment,2019年78(6):4611-4622 ISSN：1435-9529
通讯作者：
Lu, Haijun
作者机构：
[Lu, Haijun; Xu, Shicheng; Li, Jixiang] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Hubei, Peoples R China.;[Lu, Haijun] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China.;[Liu, Junzhu] Beijing Geo & Inv Engn Inst, Beijing 100083, Peoples R China.
通讯机构：
[Lu, Haijun] W;[Lu, Haijun] C;Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Hubei, Peoples R China.;Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China.
关键词：
Structured clay;Landfill leachate;Triaxial shear test;Microstructure;Particle distribution
摘要：
City solid waste stock has exceeded 8 billion tons in China, and the output and coverage area of solid waste are increasing daily. Landfill leachate can be generated during biodegradation of disposed and stored solid waste. Leachate contains high concentrations of organic mixtures and heavy metal ions. Natural undisturbed soil has high anti-seepage capacity and its permeability coefficient is less than 1 x 10(-7) cm/s in underlying stratum, which can delay leachate contamination of the environment surrounding a landfill site. However, undisturbed soil exhibits certain structural characteristics. After long-term leachate corrosion, leachate leakage will inevitably influence the stability of stratum underlying a landfill. In this study, the mechanical characteristics of undisturbed clay under the actions of landfill leachate and stress were analyzed via a consolidated-undrained triaxial shear test. Comprehensive microstructure laboratory tests, including X-ray diffraction, scanning electron microscopy, and laser particle size tests, were performed to determine at different times the microstructure of undisturbed clay due to corrosion by landfill leachate. Experimental results indicate the strength and microstructural evolution of structured clay under the actions of landfill leachate and stress. The research results are helpful for evaluating the safety and predicting the stability of a landfill's underlying stratum.
摘要：
In the present paper, the addition of silane to improve the properties of mortar was experimentally investigated. The morphology and microstructure of mortar were investigated by using both scanning electron microscopy (SEM) and polarizing microscopy (PM). The results show that silane significantly alters the microstructure of mortar, reduces the crystallization, restricts the degree of hydration of cement-based materials, and decreases micro-voids. As a result, silane effectively improves the chemical and carbonation resistance, as well as the chloride and water penetration resistance of mortar. Results also indicate that the consistency of mortar was improved but the compressive strength of the mortar was decreased. Specifically, silane would also be beneficial to the bridging cracking function to resist crack propagation.
摘要：
In order to research the corrosive state of landfill liner system, which affected by landfill leachate, and explore its strength and microstructure properties, contacting reaction between landfill leachate and compacted clay landfill liner system was simulated. Then, clay samples of different layers were investigated by unconfined compressive testing, shear testing and static nitrogen adsorption testing. The results showed that corrosion degree of clay samples caused by landfill leachate increased with the decrease of deepness of clay. And the maximum unconfined compressive strength (UCS) decreased obviously along with the shear strength. The UCS at 10cm was 53.1% that of layer at 50cm and the shear strength was 40.4∼62.4% at 10cm that of 50cm. The static nitrogen adsorption testing showed that the shape of clay particle was bottleneck like, and with the decrease of the depth of clay, there was a decrease in the number of micropores whose size was no smaller than 6nm. And the number of pores which was between 2nm and 5nm increased. In addition, there also appeared micropore which was smaller than 2nm. And the average pore size was decreased from 5.083nm at 50cm to 3.768nm at 10cm.<br/>
期刊：
Journal of Chemistry,2015年2015:1-7 ISSN：2090-9063
通讯作者：
Lu, Haijun
作者机构：
[Lu, Haijun] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China.;[Wang, Changhong; Lu, Haijun; Dong, Yiqie; Li, Jixiang] Wuhan Polytech Univ, Inst Poromech, Wuhan 430023, Peoples R China.
通讯机构：
[Lu, Haijun] C;Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China.
摘要：
The potential of clay containing 0 similar to 5% sewage sludge ash (SSA) is assessed for use as a landfill liner-soil material. Low temperature N-2 adsorption, batch adsorption, permeability, and unconfined compressive strength tests are performed to evaluate pore structure, adsorption capacity, hydraulic conductivity, and unconfined compressive strength of the clays. The pore size distribution of the modified clay containing SSA ismainly composed of micropores (< 2 nm) andmesopores (2 similar to 7 nm). With the increasing of SSA from 0% to 5%, the adsorption capacity of Zn(II) and Cu(II) to the clay increases 37% and 273%, respectively. The hydraulic conductivity of modified clay is from 3.62 x 10(-8) to 2.17 x 10(-8) cm/s. At SSA = 3%, the unconfined compressive strength of the clay reaches the maximum value of 601.1 kPa. After the clay containing SSA is contaminated by acid and alkali chemical solutions, the amount of mesopores and hydraulic conductivity increase. The adsorption capacity and unconfined compressive strength of contaminated clay decrease about 2 similar to 44% and 25.7 similar to 38.2%, respectively. The modified clay containing SSA can meet the adsorption and geotechnical requirement of landfill liners.
期刊：
Lecture Notes in Electrical Engineering,2014年163:735-740 ISSN：1876-1100
通讯作者：
Li, J.(1714064990@qq.com)
作者机构：
[Jin Li] School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, China
会议名称：
2012年控制与信息国际会议
会议时间：
2012-09-21
会议地点：
中国重庆
摘要：
This article has analyzed the customer relations management, the data mining technology, as well as based on the customer life cycle; the data mining performs in the customer relations management’s ap
作者机构：
School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan, China;Department of Civil Engineering, Wuhan Polytechnic University, Wuhan, China;Department of Scientific Research, Wuhan Traffic Management, Bureau Wuhan, China;School of Environment and City, Wuhan Institute of Technology, Wuhan, China
通讯机构：
School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, China
