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学者姓名:张志红
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Abstract :
With the increase of soil consolidation degree, the pore water pressure induced by thermal loading drops dramatically. To conveniently and quickly calculate the thermal pore water pressure inside the soil under different overconsolidation states and quantify overconsolidation effect on thermal pore water pressure, a calculation method of thermal pore water pressure considering overconsolidation effect for saturated clay is proposed. The method is verified by the relevant experimental data, and good agreements were achieved. Through analyzing the influence mechanism of OCR on the thermal pore water pressure, three important findings were captured. (1) For overconsolidated clay, thermal pore water pressure decreases nonlinearly with the increase of OCR. (2) There is a critical threshold of OCR 4.3; when 1 < OCR <= 4.3 (slightly overconsolidated state), the ratio of compression line slope to recompression line slope (?) of overconsolidated clay is consistent with that of the normally consolidated clay, while when OCR > 4.3 (highly overconsolidated state), the value of ? is smaller than that of normally consolidated clay. (3) For highly overconsolidated clay (OCR > 4.3), considering the reducing of ? with OCR, the prediction accuracy of the thermal pore pressure calculation method has been greatly improved; especially when OCR equals 30, the prediction accuracy improves by 92.7% as temperature change achieves 35 degrees C.
Keyword :
thermal pore water pressure thermal pore water pressure calculation method calculation method overconsolidation effect overconsolidation effect saturated clay saturated clay
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GB/T 7714 | Tian, Gailei , Zhang, Zhihong . A Calculation Method of Thermal Pore Water Pressure Considering Overconsolidation Effect for Saturated Clay [J]. | APPLIED SCIENCES-BASEL , 2022 , 12 (13) . |
MLA | Tian, Gailei 等. "A Calculation Method of Thermal Pore Water Pressure Considering Overconsolidation Effect for Saturated Clay" . | APPLIED SCIENCES-BASEL 12 . 13 (2022) . |
APA | Tian, Gailei , Zhang, Zhihong . A Calculation Method of Thermal Pore Water Pressure Considering Overconsolidation Effect for Saturated Clay . | APPLIED SCIENCES-BASEL , 2022 , 12 (13) . |
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Abstract :
本实用新型提供一种锚尾锥及带锚尾锥的锚杆装置,属于岩土工程防护技术领域。该锚尾锥包括锥头和锥尾,锥头包括第一端面和第二端面,锥头在第一端面和第二端面之间,直径依次递增,锥尾包括第三端面和第四端面,锥尾在第三端面和第四端面之间,直径依次递减,锥头的第二端面与锥尾的第三端面对接,形成锚尾锥,锚尾锥的中心设有锚孔,锚孔为通孔。该带锚尾锥的锚杆装置包括筋体、承载垫板、止浆塞、限位螺母和该锚尾锥,筋体顶部设有第一外螺纹,承载垫板套设于第一外螺纹上,承载垫板被限位螺母和止浆塞夹持于中间;锚尾锥设置于筋体的底部,承载垫板、止浆塞、限位螺母的中心通孔与锚孔对中。该锚尾锥具有自锁功能,该锚杆装置能够增加锚固力。
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GB/T 7714 | 郑宏 , 李严严 , 张志红 et al. 锚尾锥及带锚尾锥的锚杆装置 : CN202222901048.2[P]. | 2022-11-01 . |
MLA | 郑宏 et al. "锚尾锥及带锚尾锥的锚杆装置" : CN202222901048.2. | 2022-11-01 . |
APA | 郑宏 , 李严严 , 张志红 , 林姗 . 锚尾锥及带锚尾锥的锚杆装置 : CN202222901048.2. | 2022-11-01 . |
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Abstract :
Pores of shale exhibit multiscale characteristics, and pore characterization is challenging due to the complexity of pore systems. Currently, research is focused on nano-submicron pores, but the structure of micrometer-scaled pores is not well understood. In this research, an investigation of the three-dimensional pore network of the Chang 7 shale in the Ordos Basin of China was conducted, in order to provide an insight into the full characteristics of pore systems. Nano-CT and micro-CT scanning technology was used to comprehensively delineate the pore structure at different scales, for further understanding the gas storage mechanism in shale rocks. Results show that the radius of micro-scale pores ranges from 1 to 15 mu m, with an average of 2.8 mu m, and pores with radii of 1-5 mu m occupy approximately 90% of all the pores. For the nano-scale pores, the size ranges from 86 to 2679 nm, with an average of 152 nm, yet it has a rather concentrated distribution within 300 nm. The nano-scale pores constitute most of the pore amount in the shale, whereas the micro-scale pores constitute most of the pore volumes. Moreover, the results show that more than 70% of nano-scale pores in the Chang 7 shale are isolated pores, indicating that pore bodies formed in the shale reservoir have poor connectivity. Positive linear relationships between pore sizes and the number of pore throats at the micro-scale and nano-scale were both obtained, suggesting that larger pores tend to have better connectivity than smaller pores.
Keyword :
nano-CT nano-CT shale gas shale gas pore structure pore structure micro-CT micro-CT
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GB/T 7714 | Li, Yanyan , Zhang, Zhihong , Wei, Siyu et al. Opportunities in Measuring Multiscale Pore Structure of the Continental Shale of the Yanchang Formation, Ordos Basin, China [J]. | ENERGIES , 2021 , 14 (17) . |
MLA | Li, Yanyan et al. "Opportunities in Measuring Multiscale Pore Structure of the Continental Shale of the Yanchang Formation, Ordos Basin, China" . | ENERGIES 14 . 17 (2021) . |
APA | Li, Yanyan , Zhang, Zhihong , Wei, Siyu , Yang, Peng , Shang, Yanjun . Opportunities in Measuring Multiscale Pore Structure of the Continental Shale of the Yanchang Formation, Ordos Basin, China . | ENERGIES , 2021 , 14 (17) . |
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Abstract :
Clays are widely used in geotechnical and geoenvironmental engineering applications and it is crucial to understand its behaviour for the dynamic field conditions. The presence of a temperature gradient across clayey soils that exhibit semi-permeable membrane (or osmotic) behaviour may promote a number of complex processes, including thermal expansion or consolidation, thermally induced osmosis, thermal diffusion, along with other flow and deformation processes. Chemical-osmosis and chemico-osmotic consolidation that are significant in isothermal conditions are also affected by temperature. Publications on chemical-osmosis, and to some extent thermo-osmosis behaviour of semi-permeable clays under coupled conditions are widely available. However, studies that include the influence of both thermo-osmosis and chemical-osmosis together are rare. In this paper, a fully coupled numerical model is presented to study the effects of both osmotic processes on thermo-hydromechanical-chemical behaviour of semi-permeable clays. Solute spread in a landfill clay liner is investigated under the combined influence of mechanical, thermal, and chemical loading. Model results show that the clay deformation is sensitive to thermo-osmosis; and the effects of thermo-osmotic consolidation, excess pore water dissipation, and the overall settlement increases with temperature. Variation of the source temperature from 40 degrees C to 80 degrees C yielded an increase of 11.3% of the peak soil settlement. Significant contribution of thermoosmosis on solute transport is noticed in this study and ignoring the process substantially deviate from the realism. Up to 80% overprediction of cadmium spread is observed in the clay liner when the thermo-osmotic processes are neglected.
Keyword :
Thermo-osmotic conductivity Thermo-osmotic conductivity Temperature Temperature Osmotic conductivity Osmotic conductivity Sorption Sorption Deformation Deformation Coupled transport Coupled transport
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GB/T 7714 | Zhang, Zhihong , Masum, Shakil A. , Tian, Gailei et al. Modelling non-isothermal volume change and solute transport behaviours of a semi-permeable clay soil under the combined influence of mechanical loading, chemical-osmosis, and thermo-osmosis [J]. | ENGINEERING GEOLOGY , 2021 , 293 . |
MLA | Zhang, Zhihong et al. "Modelling non-isothermal volume change and solute transport behaviours of a semi-permeable clay soil under the combined influence of mechanical loading, chemical-osmosis, and thermo-osmosis" . | ENGINEERING GEOLOGY 293 (2021) . |
APA | Zhang, Zhihong , Masum, Shakil A. , Tian, Gailei , Thomas, Hywel R. . Modelling non-isothermal volume change and solute transport behaviours of a semi-permeable clay soil under the combined influence of mechanical loading, chemical-osmosis, and thermo-osmosis . | ENGINEERING GEOLOGY , 2021 , 293 . |
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Abstract :
The calculation formulas for water inflow of a circular foundation pit with different insertion depths of waterproof curtain are proposed based on the principle of seepage continuity of groundwater and Darcy's law. The analytical solution of ground subsidence outside the foundation pit with different insertion depths of waterproof curtain is proposed according to the method of resistance coefficient widely used in ship engineering in China. Finally, an applicable procedure of dewatering of foundation pit with waterproof curtain partially penetrating aquifers was developed, in which water control cost is set as the target, and ground subsidence and groundwater inflow are set as the constraints conditions considering both safety and economy of foundation pit design. The proposed optimization method for water control was applied in a project site in Tongzhou district, Beijing. © 2021, Editorial Department of Journal of Northeastern University. All right reserved.
Keyword :
Waterproofing Waterproofing Flow of fluids Flow of fluids Hydrogeology Hydrogeology Aquifers Aquifers Subsidence Subsidence Groundwater resources Groundwater resources Foundations Foundations
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GB/T 7714 | Zhang, Zhi-Hong , Qin, Wen-Long , Zhang, Qin-Xi et al. Water Control Optimization Method of Foundation Pit with Suspended Waterproof Curtain [J]. | Journal of Northeastern University , 2021 , 42 (2) : 242-251 . |
MLA | Zhang, Zhi-Hong et al. "Water Control Optimization Method of Foundation Pit with Suspended Waterproof Curtain" . | Journal of Northeastern University 42 . 2 (2021) : 242-251 . |
APA | Zhang, Zhi-Hong , Qin, Wen-Long , Zhang, Qin-Xi , Guo, Yan-Chen . Water Control Optimization Method of Foundation Pit with Suspended Waterproof Curtain . | Journal of Northeastern University , 2021 , 42 (2) , 242-251 . |
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Abstract :
工程建设中地下水资源保护问题一直是社会各界关注的焦点.以国内首例城市地铁PBA暗挖车站边导洞内施工地下连续墙止水工程为依托,采用MIDAS/GTS NX软件重点模拟了导洞内地下连续墙施工前、施工中及施工后的地表沉降变化规律,并与现场监测数据进行对比分析.结果表明:1)地下连续墙施工前,地表沉降曲线以车站中线为中心,呈明显对称的沉降槽形式分布;2)地下连续墙施工中,单侧地下连续墙施工完成,其上方地表附近沉降影响最为明显,地表沉降量增量约占总沉降量的25%;3)左右两侧地下连续墙施工完成后,地表沉降量增量曲线类似W型;4)左右侧地连墙分别施工6幅以后,上方地表处沉降趋于稳定,沉降速率基本保持不变.
Keyword :
PBA PBA 地下连续墙 地下连续墙 边导洞 边导洞 地表沉降 地表沉降
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GB/T 7714 | 朱雅倩 , 薛洪松 , 刘希胜 et al. 暗挖车站地下连续墙施工地表沉降分析 [J]. | 岩土工程技术 , 2021 , 35 (2) : 77-83,98 . |
MLA | 朱雅倩 et al. "暗挖车站地下连续墙施工地表沉降分析" . | 岩土工程技术 35 . 2 (2021) : 77-83,98 . |
APA | 朱雅倩 , 薛洪松 , 刘希胜 , 杜昌隆 , 赵旭 , 张志红 . 暗挖车站地下连续墙施工地表沉降分析 . | 岩土工程技术 , 2021 , 35 (2) , 77-83,98 . |
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Abstract :
基于地下水渗流连续性原理并结合达西定律,推导出了止水帷幕在不同插入深度下的圆形基坑涌水量计算公式.在此基础上,借鉴我国船舶工程中广泛采用的阻力系数法,提出了考虑悬挂式止水帷幕的地表沉降量计算方法.最后综合涌水量和地面沉降计算方法,以控水成本为目标,以基坑涌水量和坑外地面沉降量为约束条件,建立了一套完整的兼顾基坑设计安全性和经济性的悬挂式止水帷幕基坑控水设计优化方法,并以北京市通州区某工程场地为例,对所建立的控水优化方法进行了具体应用.
Keyword :
基坑降水 基坑降水 优化设计 优化设计 地面沉降 地面沉降 控水 控水 悬挂式止水帷幕 悬挂式止水帷幕 涌水量 涌水量
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GB/T 7714 | 张志红 , 秦文龙 , 张钦喜 et al. 悬挂式止水帷幕基坑控水优化方法 [J]. | 东北大学学报(自然科学版) , 2021 , 42 (02) : 242-251 . |
MLA | 张志红 et al. "悬挂式止水帷幕基坑控水优化方法" . | 东北大学学报(自然科学版) 42 . 02 (2021) : 242-251 . |
APA | 张志红 , 秦文龙 , 张钦喜 , 郭晏辰 . 悬挂式止水帷幕基坑控水优化方法 . | 东北大学学报(自然科学版) , 2021 , 42 (02) , 242-251 . |
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Abstract :
抗剪强度指标的准确测定对尾渣堆场的设计和稳定性评价具有非常重要的意义。采用TSZ-2全自动三轴仪,开展了三种不同含水率条件下的红土镍矿尾渣试样固结不排水强度试验,确定了红土镍矿尾渣的应力-应变、孔隙水压力及抗剪强度指标的变化规律。试验结果表明:红土镍矿尾渣的应力-应变关系呈应变硬化型;尾渣含水率接近最优含水率时,孔压-应变关系表现出剪胀倾向,含水率为31%时,孔压-应变关系表现出剪缩倾向;随着含水率的增加,尾渣的有效黏聚力逐渐减小,有效内摩擦角逐渐增大;尾渣的黏聚力受含水率影响较大。
Keyword :
固结不排水 固结不排水 抗剪强度 抗剪强度 尾渣堆场 尾渣堆场 红土镍矿 红土镍矿
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GB/T 7714 | 王希萌 , 郭利杰 , 李文臣 et al. 红土镍矿尾渣三轴抗剪强度试验研究 [J]. | 水利与建筑工程学报 , 2021 , 19 (01) : 165-169 . |
MLA | 王希萌 et al. "红土镍矿尾渣三轴抗剪强度试验研究" . | 水利与建筑工程学报 19 . 01 (2021) : 165-169 . |
APA | 王希萌 , 郭利杰 , 李文臣 , 张志红 . 红土镍矿尾渣三轴抗剪强度试验研究 . | 水利与建筑工程学报 , 2021 , 19 (01) , 165-169 . |
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Abstract :
依托2022年冬奥会国家跳台滑雪场高切坡工程,为探究新型格宾网箱生态护坡的稳定性,采用有限元软件MIDAS/GTS NX,基于强度折减法开展地震、降雨及地震与降雨共同作用的复杂条件下格宾网箱生态护坡整体稳定性数值模拟分析.基于极限平衡原理推导了格宾网箱护坡结构的自身抗滑移稳定系数计算公式,并对其自身稳定性进行分析评价.结果表明:新型格宾网箱支护结构体系对边坡整体稳定性影响较小,且能够有效限制边坡位移,地震作用下的护坡效果尤其显著,其自身也具有良好的自稳定性,可较好地适用于国家跳台滑雪场高切坡的生态支护,可为类似高山滑雪赛道工程的生态护坡提供参考.
Keyword :
生态护坡 生态护坡 数值模拟 数值模拟 降雨 降雨 格宾网箱 格宾网箱 地震 地震 边坡稳定性 边坡稳定性
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GB/T 7714 | 王希萌 , 张志红 , 白顺果 . 复杂条件下格宾网箱生态护坡稳定性分析 [J]. | 水资源与水工程学报 , 2021 , 32 (4) : 221-228 . |
MLA | 王希萌 et al. "复杂条件下格宾网箱生态护坡稳定性分析" . | 水资源与水工程学报 32 . 4 (2021) : 221-228 . |
APA | 王希萌 , 张志红 , 白顺果 . 复杂条件下格宾网箱生态护坡稳定性分析 . | 水资源与水工程学报 , 2021 , 32 (4) , 221-228 . |
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Abstract :
随着城市地铁建设的迅猛发展,地铁工程建设中车站开挖大面积抽降水作业与国家保护地下水资源政策的矛盾日益突出,亟需寻求适用于地铁车站开挖的非降水止水方式。以北京地铁16号线在施暗挖车站——看丹站为依托,对其采用的洞内地下连续墙止水措施导致的环境效应开展了深入探讨。由于地下连续墙在暗挖车站局促空间内的施作尚属首例尝试,因此重点聚焦于揭示地下连续墙施工引起的导洞拱顶沉降、水平净空收敛和应力分布的变化规律。数值模拟结果表明:地下连续墙施工主要引起导洞拱顶沉降的变化,导洞水平净空收敛较为稳定;地下连续墙施工前,导洞初期支护拉应力主要在导洞拱顶处和侧壁底角处。地下连续墙施工完成后,拉应力分布范围扩大,左右边...
Keyword :
洞桩(PBA)工法 洞桩(PBA)工法 地下连续墙 地下连续墙 环境效应 环境效应 边导洞 边导洞
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GB/T 7714 | 薛洪松 , 朱雅倩 , 刘希胜 et al. 暗挖车站洞内地下连续墙施工导洞环境效应分析 [J]. | 科学技术与工程 , 2021 , 21 (24) : 10440-10451 . |
MLA | 薛洪松 et al. "暗挖车站洞内地下连续墙施工导洞环境效应分析" . | 科学技术与工程 21 . 24 (2021) : 10440-10451 . |
APA | 薛洪松 , 朱雅倩 , 刘希胜 , 杜昌隆 , 张志红 , 李立云 . 暗挖车站洞内地下连续墙施工导洞环境效应分析 . | 科学技术与工程 , 2021 , 21 (24) , 10440-10451 . |
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