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Comparative study on pullout behaviour of pressure grouted soil nails from field and laboratory tests

Journal of Central South University 2013年第8期20卷 2285-2292页

作者： HONG Cheng-yu yin jian-hua PEI hua-fu Department of Civil Engineering Shantou University Shantou 515063 China Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong China

Pullout resistance of a soil nail is a critical parameter in design and analysis for geotechnical engineers. Due to the complexity of field conditions, the pullout behaviour of cement grouted soil nail in field is not well investigated. In this work, a number of field pullout tests of pressure grouted soil nails were conducted to estimate the pullout resistance of soil nails. The effective bond lengths of field soil nails were accurately controlled by a new grouting packer system. Typical field test results and the related comparison with typical laboratory test results reveal that the apparent coefficient of friction （ACF） decreases with the increase of overburden soil pressure when grouting pressure is constant, but increases almost linearly with the increase of grouting pressure when overburden pressure （soil depth） is unchanged. Water contents of soil samples at soil nail surfaces show obvious reductions compared with the results of soil samples from drillholes. After soil nails were completely pulled out of the ground, surface conditions of the soil nails and surrounding soil were examined. It is found that the water content values of the soil at the soil/nail interfaces decrease substantially compared with those of soil samples extracted from drillholes. In addition, all soil nails expand significantly in the diametrical direction after being pulled out of ground, indicating that the pressurized cement grout compacts the soil and penetrates into soil voids, leading to a corresponding shift of failure surface into surrounding soil mass significantly.

关键词： soil nail apparent coefficient of friction overburden soil pressure grouting pressure

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Analysis of Network Performance for Computer Communication Systems with Benchmark

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Wuhan University Journal of Natural Sciences 2000年第2期5卷 164-168页

作者： Cao Yang yin jian-hua Lu Yong Wuhan University College of Electronic Information Wuhan China (GRID:grid.49470.3e) (ISNI:***)

This paper introduced a performance evaluating approach of computer communication system based on the simulation and measurement technology, and discussed its evaluating models. The result of our experiment showed that the outcome of practical measurement on Ether-LAN fitted in well with the theoretical analysis. The approach we presented can be used to define various kinds of artificially simulated load models conveiently, build all kinds of network application environments in a flexible way, and exert sufficiently the widely-used and high-precision features of the traditional simulation technology and the reality, reliability, adaptability features of measurement technology.

关键词： performance evaluation evaluating model artificially simulated load benchmark

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Experimental and numerical modeling on vacuum consolidation behavior of staged-filled soil slurry with prefabricated horizontal drain and fl occulant

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JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 2024年第12期16卷 5231-5248页

作者： Song, Ding-Bao Pan, Yu Chen, Wen-Bo yin, Zhen-Yu Feng, Wei-Qiang yin, jian-hua Shenzhen Univ Coll Civil & Transportat Engn Shenzhen Peoples R China Hong Kong Polytech Univ Dept Civil & Environm Engn Hung Hom Kowloon Hong Kong Peoples R China Southern Univ Sci & Technol Dept Ocean Sci & Engn Shenzhen Peoples R China

The vacuum-assisted prefabricated horizontal drain offers a promising method for strengthening soil slurry, allowing simultaneous filling and vacuum-dewatering via staged construction. However, there is limited research on the unique characteristics of staged filling. This study aims to investigate the vacuum consolidation process of staged-filled soil slurry through laboratory model tests and numerical simulations, also assessing the impact of anionic polyacrylamide. Comparative analyses are conducted between vacuum consolidation with and without anionic polyacrylamide, as well as self-weight consolidation without anionic polyacrylamide. Results reveal contour lines of excess pore pressure, water content, and soil strength forming an ellipse around the prefabricated horizontal drain board. During the consolidation process, a higher degree of consolidation, lower water content, and higher soil strength were observed closer to the prefabricated horizontal drain board. After treatment, the uppermost filling layer exhibits an average water content that was approximately 40% higher than the lower filling layer, and its average strength was about 60% lower. This discrepancy is primarily due to the absence of sealing on the top surface and the relatively short vacuum consolidation time caused by staged filling. The introduction of anionic polyacrylamide-induced flocculation significantly improves the initial consolidation rate but minimally affects the dewatering capacity of vacuum preloading. Using flocculant can enhance both the staged filling rate and soil strength (by 1-2 times). Additionally, employing a staggered arrangement between different prefabricated horizontal drain layers is advisable to prevent top-down penetration in areas with low soil strength. (c) 2024 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/ 4.

关键词： Flocculation Model test Numerical modeling Prefabricated horizontal drains Staged-filled slurry Vacuum consolidation

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Design of Intelligent Network Performance Analysis & Forecast Support System

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Wuhan University Journal of Natural Sciences 2001年第3期6卷 675-679页

作者： Wang Zhi Xu Ning yin jian-hua Cao Yang Su Yu-bei College of Electronic Information Wuhan University Wuhan 430072 China

A system designed for supporting the network performance analysis and forecast effort is presented, based on the combination of offline network analysis and online real-time performance forecast. The off-line analysis will perform analysis of specific network node performance, correlation analysis of relative network nodes performance and evolutionary mathematical modeling of long-term network performance measurements. The online real-time network performance forecast will be based on one so-called hybrid prediction modeling approach for short-term network, performance prediction and trend analysis. Based on the module design, the system proposed has good intelligence, scalability and self-adaptability, which will offer highly effective network performance analysis and forecast tools for network managers, and is one ideal support platform for network performance analysis and forecast effort.

关键词： network performance analysis real-time forecast evolutionary modeling hybrid prediction modeling

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Betavoltaic Battery Conversion Efficiency Improvement Based on Interlayer Structures

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Chinese Physics Letters 2012年第7期29卷 268-271页

作者： LI Da-Rang jianG Lan yin jian-hua TAN Yuan-Yuan LIN Nai Laser Micro/Nano Fabrication Laboratory School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081 National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083

Significant differences among the doping densities of PN junctions in semiconductors cause lattice mismatch and lattice defects that increase the recombination current of betavoltaic *** extensively decreases the open circuit voltage and the short current,which results in low conversion *** study proposes P+PINN+-structure based betavoltaic batteries by adding an interlayer to typical PIN structures to improve conversion *** simulations are conducted for the energy deposition of beta particles along the thickness direction in *** on this,63 Ni-radiation GaAs batteries with PIN and P+PINN+ structures are designed and fabricated to experimentally verify the proposed *** turns out that the conversion efficiency of the betavoltaic battery with the proposed P+ PINN+ structure is about 1.45 times higher than that with the traditional PIN structure.

关键词： Battery battery semiconductors

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Uniqueness of rate-dependency, creep and stress relaxation behaviors for soft clays

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Journal of Central South University 2015年第1期22卷 296-302页

作者：朱启银尹振宇徐长节殷建华夏小和 Department of Civil Engineering Shanghai Jiao Tong University State Key Laboratory for Geomechanics and Deep Underground Engineering(China University of Mining and Technology) Lunan University Ecole Centrale de NantesUMR CNRS Ge M Nantes France School of Civil Engineering and Architecture Departments East China Jiaotong University Department of Civil and Environmental Engineering Hong Kong Polytechnic University

This work focuses on the uniqueness of rate-dependency, creep and stress relaxation behaviors for soft clays under one-dimensional condition. An elasto-viscoplastic model is briefly introduced based on the rate-dependency of preconsolidation pressure. By comparing the rate-dependency formulation with the creep based formulation, the relationship between rate-dependency and creep behaviors is firstly described. The rate-dependency based formulation is then extended to derive an analytical solution for the stress relaxation behavior with defining a stress relaxation coefficient. Based on this, the relationship between the rate-dependency coefficient and the stress relaxation coefficient is derived. Therefore, the uniqueness between behaviors of rate-dependency, creep and stress relaxation with their key parameters is obtained. The uniqueness is finally validated by comparing the simulated rate-dependency of preconsolidation pressure, the estimated values of secondary compression coefficient and simulations of stress relaxation tests with test results on both reconstituted Illite and Berthierville clay.

关键词： soft clays creep rate-dependency stress relaxation oedometer test

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HBV genotype C is independently associated with cirrhosis in community-based population

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World Journal of Gastroenterology 2010年第3期16卷 379-383页

作者： yin, jian-hua Zhao, Jun Zhang, Hong-Wei Xie, Jia-Xin Li, Wei-Ping Xu, Guo-Zhang Shen, Jie Dong, Hong-Jun Zhang, Jun Wang, Lin Han, jian-Kang Wang, Hong-Yang Cao, Guang-Wen Second Mil Med Univ Dept Epidemiol Shanghai 200433 Peoples R China Second Mil Med Univ Affiliated Hosp 3 Dept Hepatobiliary Surg Shanghai 200438 Peoples R China Second Mil Med Univ Dept Ultrasonog Affiliated Hosp 1 Shanghai 200433 Peoples R China Municipal Ctr Dis Control & Prevent Ningbo Ningbo 315010 Zhejiang Peoples R China Municipal Ctr Dis Control & Prevent Soochow Suzhou 215007 Jiangsu Peoples R China Dist Ctr Dis Control & Prevent Yangpu Shanghai 200090 Peoples R China Municipal Ctr Dis Control & Prevent Huzhou Huzhou 313000 Zhejiang Peoples R China Second Mil Med Univ Lab Signal Transduct Affiliated Hosp 3 Shanghai 200438 Peoples R China

AIM:To determine the association of hepatitis B virus (HBV) genotypes with probable cirrhosis and fatty liver in community-based ***: A multi-stage cluster probability sampling method was applied to recruit 10 167 subjects aged between 6 and 72 years from our epidemiological bases in Eastern China. After excluding the subjects co-infected with hepatitis C or hepatitis D viruses, the hepatitis B surface antigen (HBsAg)-positive subjects were examined for HBV genotype, serum viral load, alanine aminotransferase (ALT), hepatitis B e antigen (HBeAg) status, and ultrasonographic changes. Logistic regression models were used to determine the factors associated with probable cirrhosis and fatty ***: Of 634 HBsAg-positive subjects with HBV genotype determined, 82 had probable cirrhosis (ultrasonographic score ≥5), 42 had ultrasonographic fatty liver. Probable cirrhosis was only found in the HBeAg-negative subjects, and more frequently found in the subjects with genotype C than in those with genotype B (14.8% vs 8.0%, P=0.018). In HBeAg-negative subjects, high viral load was frequently asso-ciated with abnormal ALT level, while ALT abnormality was more frequent in those with probable cirrhosis than those without (19.5% vs 7.8%, P=0.001). Univariate analysis showed that age, sex, HBV genotypes, and viral load were not significantly associated with ultrasonographic fatty liver, whereas ALT abnormality was significantly related to ultrasonographic fatty liver (OR=4.54,95% CI:2.11-9.75, P<0.001). Multivariate analysis demonstrated that HBV genotype C, age (≥45 years), male sex, and ALT abnormality were independently associated with probable cirrhosis (AOR=2.30,95% CI:1.26-4.19; AOR =1.81,95% CI:1.10-2.99;AOR=1.74,95% CI:1.03-2.95; AOR=2.98,95% CI:1.48-5.99, respectively).CONCLUSION: A crude prevalence of probable cirrhosis is 12.9% in the community-based HBV-infected subjects. HBV genotype C is independently associated with probable cirrhosis in the HBe

关键词： Hepatitis B virus Genotype Viral load Alanine aminotransferase Probable cirrhosis Ultrasonography

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两对边固支另两对边自由弹性矩形薄板理论解

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重庆建筑大学学报 2005年第6期27卷 29-32页

作者：钟阳殷建华大连理工大学土木学院大连116024 香港理工大学土木学院

利用辛几何的方法推导出了两对边固支另两对边自由支承条件情况下,弹性矩形薄板问题的理论解。在推导过程中并不需要事先人为的假定挠度函数,而是直接从弹性矩形薄板问题的控制方程出发,利用纯数学的手段推导出问题的解析解,使得求解过... 详细信息

利用辛几何的方法推导出了两对边固支另两对边自由支承条件情况下,弹性矩形薄板问题的理论解。在推导过程中并不需要事先人为的假定挠度函数,而是直接从弹性矩形薄板问题的控制方程出发,利用纯数学的手段推导出问题的解析解,使得求解过程更加理论化,从而为进一步解决了这类问题(例如动力问题)奠定了理论基础。文中还给出了算例来验证方法的正确性。

关键词：两对边固支另两对边自由支承弹性矩形薄板辛几何法理论解

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土的三模量增量非线性模型及其推广

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岩土力学 2000年第1期21卷 16-19,53页

作者：殷建华香港理工大学土木及结构工程系

介绍了三轴条件下的两个三模量增量非线性应力应变关系式。其中一个用 K , G , J表述的关系式便于常规有限元计算使用。在次弹性理论基础上将三轴条件下的用 K , G , J表达的三模量关系式推广到一般的三维应力条件下。给出了三维本... 详细信息

介绍了三轴条件下的两个三模量增量非线性应力应变关系式。其中一个用 K , G , J表述的关系式便于常规有限元计算使用。在次弹性理论基础上将三轴条件下的用 K , G , J表达的三模量关系式推广到一般的三维应力条件下。给出了三维本构关系的张量形式和矩阵形式 ,并对矩阵形式中典型项目的物理意义作了解释。

关键词：本构应力应变模量土力学非线性模型

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基于DEA的我国省际工业部门全要素能源效率分析

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兵工学报 2009年第S1期30卷 191-196页

作者：尹建华赵慎泽对外经济贸易大学国际商学院北京100029 北京理工大学管理与经济学院北京100081

运用数据包络分析(DEA)方法,构建了以各省市规模以上工业企业的总产值为产出,各省市规模以上工业企业能耗、固定资本年均余额和流动资本年均余额、从业人员的年平均数为投入的能源效率评价模型,并对2005—2007年间我国30个省市工业部门... 详细信息

运用数据包络分析(DEA)方法,构建了以各省市规模以上工业企业的总产值为产出,各省市规模以上工业企业能耗、固定资本年均余额和流动资本年均余额、从业人员的年平均数为投入的能源效率评价模型,并对2005—2007年间我国30个省市工业部门的全要素能源效率进行了实证分析。结果显示:我国工业部门能源效率较高的省市主要集中于东部沿海地区,而中部和西部大部分省市的工业部门能效相对较低,而且还存在较大程度的能源投入冗余。

关键词：全要素能源效率能源投入冗余数据包络分析

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