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Model Tests of Pile Defect Detection

Journal of China university of Geosciences 2001年第4期12卷 321-324页

作者： li guocheng wang jingtao school of civil engineering , huazhong university of science and technology , wuhan 430074 school of civil engineering Huazhong University of Science and Technology Wuhan 430074

The pile, as an important foundation style, is being used in engineering practice. Defects of different types and damages of different degrees easily occur during the process of pile construction. So, dietecting defects of the pile is very important. As so far, there are some difficult problems in pile defect detection. Based on stress wave theory, some of these typical difficult problems were studied through model tests. The analyses of the test results are carried out and some significant results of the low-strain method are obtained, when a pile has a gradually-decreasing crosssection part, the amplitude of the reflective signal originating from the defect is dependent on the decreasing value of the rate of crosssection β. No apparent signal reflected from the necking appeares on the velocity response curve when the value of β is less than about 3. 5 %.

关键词： model tests pile defect detection stress wave responses.

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Influence of aeration intensity on the performance of A/0-type sequencing batch MBR system treating azo dye wastewater

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Frontiers of Environmental science & engineering 2011年第4期5卷 615-622页

作者： Xinhua wang Jingmei li Xiufen li guocheng DU Laboratory of Environmental Biotechnology School of Environmental and Civil EngineeringJiangnan UniversityWuxi 214122China Key Laboratory of Industrial Biotechnology Ministry of EducationJiangnan UniversityWuxi 214122China

Among the numerous parameters affecting the membrane bioreactor(MBR)performance,the aeration intensity is one of the most important *** the present investigation,an anoxic/aerobic-type(A/O-type)sequencing batch MBR system,added anoxic process as a pretreatment to improve the biodegradability of azo dye wastewater,was investigated under different aeration intensities and the impact of the aeration intensity on effluent quantity,sludge properties,extracellular polymeric substances(EPS)amount generated as well as the change of permeation flux were *** lower nor higher aeration intensities could improve A/O-type sequencing batch MBR *** results showed 0.15 m^(3)·h^(-1)aeration intensity was promising for treatment of azo dye wastewater under the conditions *** this aeration intensity,chemical oxygen demand(COD),ammonium nitrogen and color removal as well as membrane flux amounted to 97.8%,96.5%,98.7%and 6.21 L·m^(-2)·h^(-1),*** effluent quality,with 25.0 mg·L^(-1)COD,0.84 mg·L^(-1)ammonium nitrogen and 8 chroma,could directly meet the reuse standard in *** the meantime,the sludge relative hydrophobicity,the bound EPS,soluble EPS and EPS amounts contained in the membrane fouling layer were 70.3%,52.0 mg·g^(-1)VSS,38.8 mg·g^(-1)VSS and 90.8 mg·g^(-1)VSS,respectively,which showed close relationships to both pollutant removals and membrane flux.

关键词： batch membrane bioreactor azo dye aeration intensity extracellular polymeric substances sludge properties

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Characteristic and correlation analysis of influent and energy consumption of wastewater treatment plants in Taihu Basin

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Frontiers of Environmental science & engineering 2019年第6期13卷 45-58页

作者： Luxi Zou Huaibo li Shuo wang Kaikai Zheng Yan wang guocheng Du Ji li Jiangsu Key Laboratory of Anaerobic Biotechnology School of Environment and Civil EngineeringJiangnan UniversityWuxi 214122China Jiangsu College of Water Treatment technology and Material Collaborative Innovation Center Suzhou 215009China Department of civil engineering Schulich School of EngineeringUniversity of CalgaryCalgary T2N 1N4Canada Ministry Key Laboratory of Industrial Biotechnology School of BiotechnologyJiangnan UniversityWuxi 214122China

The water quality and energy consumption of wastewater treatment plants(WWTPs)in Taihu Basin were evaluated on the basis of the operation data from 204 municipal WWTPs in the basin by using various statistical *** influent ammonia nitrogen(NH3-N)and total nitrogen(TN)of WWTPs in Taihu Basin showed normal distribution,whereas chemical oxygen demand(COD),biochemical oxygen demand(BOD5),suspended solid(SS),and total phosphorus(TP)showed positively skewed *** influent BOD5/COD was 0.4%-0.6%,only 39.2%SS/BOD5 exceeded the standard by 36.3%,the average BOD5/TN was 3.82,and the probability of influent BOD5/TP>20 was 82.8%.The average energy consumption of WWTPs in Taihu Basin in 2017 was 0.458 kWh/m^*** specific energy consumption of WWTPs with a daily treatment capacity of more than 5×10^4 m^3 in Taihu Basin was stable at 0.33 kWh/m^3.A power function relationship was observed between the reduction in COD and NH3-N and the specific energy consumption of pollutant reduction,and the higher the pollutant reduction is,the lower the specific energy consumption of pollutant reduction *** addition,a linear relationship existed between the energy consumption of WWTPs and the specific energy consumption of influent volume and pollutant ***,upgrading and operation with less energy consumption of WWTPs is imperative and the suggestions for Taihu WWTPs based on stringent discharge standard are proposed in detail.

关键词： Taihu Basin Wastewater treatment plant Influent characteristics Energy consumption evaluation Specific energy consumption SPSS correlation analysis

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黑云母花岗岩动力学特性与强度准则分析

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合肥工业大学学报（自然科学版） 2018年第10期41卷 1386-1391页

作者：钟靖涛王志亮李鸿儒合肥工业大学土木与水利工程学院安徽合肥230009

为了研究黑云母花岗岩动态特性与强度准则的应变率效应,文章采用高压动三轴仪对不同应变率、不同围压下的试样进行动三轴压缩试验。结果表明:相同应变率下,随着围压的增大,岩石破坏模式由轴向劈裂转变为剪切破坏;相同围压下,随着应变率... 详细信息

为了研究黑云母花岗岩动态特性与强度准则的应变率效应,文章采用高压动三轴仪对不同应变率、不同围压下的试样进行动三轴压缩试验。结果表明:相同应变率下,随着围压的增大,岩石破坏模式由轴向劈裂转变为剪切破坏;相同围压下,随着应变率的增大岩石破碎程度加剧;花岗岩的抗压强度随应变率和围压的增大均呈增大趋势,但增长幅度在应变率超过10-3/s和围压大于60 MPa后逐渐减小;弹性模量整体上随应变率的增加而减小,且与围压间变化规律不明确;泊松比与应变率、围压均未见明显关系,其值集中分布在0.33左右。此外,对比分析中等应变率下经典莫尔-库伦强度准则及其2种改进形式的适用性,发现考虑平均主应力修正的莫尔-库伦准则对试验数据的吻合度较高,而直线型莫尔-库伦准则和抛物线型莫尔-库伦准则拟合误差较大,且随应变率的增加,误差有增加趋势。

关键词：花岗岩动三轴试验应变率破坏模式强度准则

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基于非线性泊松比修正的邓肯-张E-ν模型及应用研究

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铁道科学与工程学报 2019年第1期16卷 71-78页

作者：毛国成陈晓斌王晅李扬波中南大学土木工程学院湖南长沙410075 重载铁路工程结构教育部重点实验室湖南长沙410075 高速铁路建造技术国家工程实验室湖南长沙410075

针对邓肯-张E-ν模型在低应力状态下粗颗粒土体变特性描述不足的问题,分析高速铁路B组粗颗粒土填料大型三轴试验得到轴向应变与横向应变的变化特征,提出基于二次函数的非线性泊松比公式。将非线性泊松比代替邓肯-张E-ν模型切线泊松比,... 详细信息

针对邓肯-张E-ν模型在低应力状态下粗颗粒土体变特性描述不足的问题,分析高速铁路B组粗颗粒土填料大型三轴试验得到轴向应变与横向应变的变化特征,提出基于二次函数的非线性泊松比公式。将非线性泊松比代替邓肯-张E-ν模型切线泊松比,建立基于非线性泊松比修正的邓肯-张E-ν模型。采用中点增量法和Abaqus二次开发平台,编写修正邓肯-张模型的用户子程序(UMAT)。通过粗粒土三轴试验的数值模拟,对修正邓肯-张模型程序的可行性进行应用研究。研究结果表明:基于非线性泊松比修正的邓肯-张模型的轴向应变-体积应变计算结果与实验实测结果一致,可真实反映粗粒土填料的轴向应变-体积应变趋势。

关键词：粗粒土高铁路基填料非线性泊松比邓肯-张模型

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