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Development of Knowledge-based Study on Optimized NATM Lining Design System 基于知识的优化NATM衬砌设计系统研究进展
IF 0.5 Q4 ENGINEERING, GEOLOGICAL Pub Date : 2018-12-01 DOI: 10.12814/JKGSS.2018.17.4.251
Ju-Sang Song, C. Yoo
This paper concerns the development of an optimized NATM secondary lining design system for a subsea tunnel. The subsea tunnel is normally laid down under the sea water and submarine ground which consists of soil or rock. The design system is the series of process which can predict lining member forces by ANN (artificial neural network system), analyze suitable section for the designated ground, construction and tunnel conditions. Finally, this lining design system aims to be connected for designing the subsea tunnel automatically. The lining member forces are predicted based on the ANN which was calculated by a FEM (finite element analysis) and it helps designers determine its lining dimension easily without any further FEM calculations.
本文研究了海底隧道NATM二次衬砌优化设计系统的开发。海底隧道通常铺设在海水和由土壤或岩石组成的海底地面之下。该设计系统是通过人工神经网络系统预测衬砌构件受力,分析指定地基、施工和隧道条件下的合适断面的一系列过程。最后,本衬砌设计系统旨在连接海底隧道的自动设计。利用人工神经网络对衬砌构件的受力进行预测,并通过有限元分析进行计算,使设计人员无需进一步的有限元计算即可方便地确定衬砌尺寸。
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引用次数: 1
The Study on The Numerical Analysis Method for Ground Improved by Cement Mixing Method 水泥搅拌法加固地基的数值分析方法研究
IF 0.5 Q4 ENGINEERING, GEOLOGICAL Pub Date : 2018-12-01 DOI: 10.12814/JKGSS.2018.17.4.041
Byungill Kim, Kang-Han Hong, Young-Seon Kim, Sang-jae Han
Since the composite ground design method is easy to apply for calculation or numerical analysis, it is applied to the design of cement mixing methods. However, the comparison studies between analysis and actual results such as a trial test and construction for the cement mixing method are few because the composite ground design method was developed for the compaction pile (SCP, GCP) methods. In this study, the results of various analysis methods, such as the composite ground analysis method (1 case) and the individual pile method (3 cases), were compared with actual measurements through a two-dimensional finite element numerical analysis. In case of the surface settlements, the results of study show that the individual plate method was larger than the actual measurements, while other methods are similar. The settlements at the under ground of the improved area is overestimated in all analysis methods. When comparing numerical analysis results for the horizontal displacement, and ground reaction forces, the individual pile method in equivalent wall concept was found to be the most similar to the measurements. The composite ground method was not able to predict the behavior of stress transfer (Arching effect) and it turned out that the prediction of horizontal displacement was too large.
由于复合地基设计方法易于应用于计算或数值分析,故将其应用于水泥搅拌方法的设计。然而,由于密实桩(SCP、GCP)方法的复合地基设计方法的发展,对水泥搅拌法的分析与实际结果的对比研究(如试验和施工)很少。本研究通过二维有限元数值分析,将复合地基分析法(1例)和单桩法(3例)等多种分析方法的结果与实际测量结果进行对比。对于地表沉降,研究结果表明,单板法比实际测量值大,而其他方法相似。所有分析方法均高估了改进区地下沉降。通过对水平位移和地面反力的数值分析结果进行比较,发现等效墙概念下的单桩法与实测结果最接近。复合地基法不能预测应力传递行为(拱效应),且预测水平位移过大。
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引用次数: 0
Controlled Low Strength Material for Emergency Restoration Using Bottom Ash and Gypsum 底灰石膏应急修复控制低强度材料
IF 0.5 Q4 ENGINEERING, GEOLOGICAL Pub Date : 2018-06-01 DOI: 10.12814/JKGSS.2018.17.2.019
So-Yeon Lee, H. Yoon, Min Son, J. Kong, Hyuk-sang Jung
Recently the ground subsidence which seriously weakens the safety of cities tends to increase. The purpose of this paper is to develop the materials by using industrial by-products for the application to emergency restoration process in case of ground subsidence. In this paper the laboratory tests including pH test, initial setting test, unconfined compressive strength test, and flow test were performed in order to evaluate the design properties of Controlled Low Strength Material (CLSM). The field test was carried out for evaluating the performance for the early strength of CLSM and the workability for emergency restoration. Test results showed that the strength will be too high to re-excavate the ground when the cement ratio is more than 4%. The optimum mixing ratio appears to be most effective when the mixing ratio of the bottom ash and the gypsum is approximately 50:50 and the cement content is 2%.
近年来,严重削弱城市安全的地面沉降有加剧的趋势。本文的目的是利用工业副产物开发用于地面沉降应急恢复过程的材料。通过pH试验、初凝试验、无侧限抗压强度试验、流动试验等室内试验,对可控低强度材料(CLSM)的设计性能进行了评价。为评价CLSM的早期强度性能和应急修复的可操作性,进行了现场试验。试验结果表明,当水泥比大于4%时,地基强度过高,无法再开挖。当底灰与石膏的掺量约为50:50,水泥掺量为2%时,最佳掺量最有效。
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引用次数: 2
Evaluation of Performance of Expansive Material for Restoration of Underground Cavity and Stress Release Zone 地下空腔及应力释放区修复膨胀材料性能评价
IF 0.5 Q4 ENGINEERING, GEOLOGICAL Pub Date : 2018-01-01 DOI: 10.12814/JKGSS.2018.17.4.141
Kicheol Lee, Byeong-Hyun Choi, J. Bak, Dongwook Kim
Recently, the number of ground subsidence resulting from underground cavity has been increased. Accordingly, the importance of restoration of stress release zone around the underground cavity has been emphasized. The stress release zone is composed of low density soils having extremely low stiffness and degree of compaction, which can lead to additional cavity expansion and collapse of overlying ground. Therefore, in this study, the suitability of restoration method of underground cavity using expansive material for reinforcement of stress release zone around the cavity is verified. The basic physical properties and expansion characteristics of the expansive material were examined. The experiment equipment capable simulating of stress release zone was developed and is used to investigate the effect of expanding material on stress release zone. The stress release zone was simulated using the spring in numerical analysis. The factors of the volume ratio of the underground cavity to the expansion material, the degree of stress relaxation, and the shape of the cavity were varied in numerical simulations, and the behavior of stress release zone was analyzed based on the numerical analysis results. Analysis variables are factors that affect each other. Also, filling of underground cavity and capacity of restoration of stress release zone were confirmed when the expansive material was inserted into underground cavity.
近年来,由于地下空腔引起的地面沉降越来越多。因此,强调了恢复地下空腔周围应力释放区的重要性。应力释放区由刚度和压实度极低的低密度土构成,可能导致上覆地面额外的空腔扩张和塌陷。因此,本研究验证了膨胀材料加固地下洞室周围应力释放区修复方法的适用性。研究了膨胀材料的基本物理性能和膨胀特性。研制了模拟应力释放区的实验装置,用于研究膨胀材料对应力释放区的影响。数值分析中采用弹簧模拟应力释放区。在数值模拟中,改变了地下空腔与膨胀物体积比、应力松弛程度和空腔形状等因素,并根据数值分析结果对应力释放区行为进行了分析。分析变量是相互影响的因素。确定了膨胀材料注入地下空腔后,地下空腔的充填情况和应力释放区的恢复能力。
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引用次数: 0
Analysis of Helical Pile Behavior in Sands Varying Helix Pitch Based on Numerical Analysis Results 基于数值分析结果的变螺旋节距沙地螺旋桩性能分析
IF 0.5 Q4 ENGINEERING, GEOLOGICAL Pub Date : 2018-01-01 DOI: 10.12814/JKGSS.2018.17.4.029
J. Bak, Kicheol Lee, Byeong-Hyun Choi, Dongwook Kim
캐나다 및 베네수엘라에 주로 분포하는 오일샌드는 원유들이 모래질 흙의 간극에 존재한다. 이러한 오일샌드로부터 원유를 따로 추출하기 위해서는 규모가 큰 플랜트를 건설해야 한다. 일반적으로 오일샌드 플랜트의 기초는 주로 항타말뚝 혹은 현장타설말뚝이 사용되고 있다. 하지만 주로 극지에 위치한 오일샌드는 얼어있...
主要分布在加拿大和委内瑞拉的油砂,原油存在于沙土的间隙中。为了从这样的油砂中单独提取原油,需要建设规模较大的成套设备。一般来说,油砂成套设备的基础主要是抗打桩或现场打桩。但是主要在极地的油砂是结冰的…
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引用次数: 1
Analysis of Behavior on GCP Composite Ground Considering Loading and Foundation Conditions 考虑荷载和地基条件的GCP复合地基性能分析
IF 0.5 Q4 ENGINEERING, GEOLOGICAL Pub Date : 2018-01-01 DOI: 10.12814/jkgss.2018.17.1.127
김경업, 박경호, 김대현
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引用次数: 1
Artificial Intelligence (AI)-based Deep Excavation Designed Program 基于人工智能(AI)的深基坑设计方案
IF 0.5 Q4 ENGINEERING, GEOLOGICAL Pub Date : 2018-01-01 DOI: 10.12814/jkgss.2018.17.4.277
C. Yoo, Haider Aizaz, Q. Abbas, Jaewon Yang
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引用次数: 2
Investigation of Behaviours of Wall and Adjacent Ground Considering Shape of Geosynthetic Retaining Wall 考虑土工合成挡土墙形状的墙体与相邻地基性能研究
IF 0.5 Q4 ENGINEERING, GEOLOGICAL Pub Date : 2018-01-01 DOI: 10.12814/jkgss.2018.17.1.095
Jonghyun Lee, 오동현, S. Kong, J. H. Sang, Yong-Joo Lee
Recently, GRS (Geosynthetic Retaining Segmental) wall has been widely used as a method to replace concrete retaining wall because of its excellent structural stability and economic efficiency. It has been variously applied for foundation, slope, road as well as retaining wall. The GRS wall system, however, has a weak point that is serious crack of wall due to stress concentration at curved part of it. In this study, therefore, behaviour of GRS wall according to shape of it, shich has convex and concave, are analysed and compared using Finite Element analysis as the fundamental study for design optimization. Results including lateral deflection, settlements of ground surface and wall obtained from 2D FE analysis are compared between straight and curved parts from 3D FE analysis.
近年来,土工合成挡土墙(GRS)以其优异的结构稳定性和经济效益被广泛应用于替代混凝土挡土墙。已广泛应用于地基、边坡、道路及挡土墙。但GRS墙体体系存在一个弱点,即墙体弯曲部分应力集中导致墙体裂缝严重。因此,在本研究中,采用有限元分析作为设计优化的基础研究,对具有凸形和凹形的GRS墙体的性能进行了分析和比较。将二维有限元分析结果与三维有限元分析结果进行了比较,包括直线和弯曲零件的横向挠度、地面和墙壁的沉降。
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引用次数: 7
Prediction of Slope Failure Using Control Chart Method 用控制图法预测边坡失稳
IF 0.5 Q4 ENGINEERING, GEOLOGICAL Pub Date : 2018-01-01 DOI: 10.12814/jkgss.2018.17.2.009
박성용, 장동수, 정재훈, Kim Young Ju, Kim Yongseong
In this study, a field model experiment was performed to analyze the bahavior of slope during failure. It was analyzed through x-MR control chart method with inverse displacement and K-value. As a result, the portent was confirmed at 4 minutes before slope failure in Case 1. The change of the control limit line according to moving range was analyzed and it was effective to apply K = 3. Use of the inverse displacement and x-MR control chart method will be useful for the prediction of abnormal behavior through quick and objective judgment. Prediction of slope failure using control chart method can be used as basic data of slope measurement management standard, and it can contribute in reduction of life and property damage caused by slope disaster.
本文通过现场模型试验,分析了边坡在破坏过程中的行为。采用逆位移和k值的x-MR控制图法进行分析。结果,在案例1边坡失稳前4分钟,该前兆得到确认。分析了控制极限线随移动范围的变化规律,表明K = 3是有效的。利用逆位移法和x-MR控制图法,通过快速客观的判断,有助于异常行为的预测。利用控制图法预测边坡失稳,可以作为边坡计量管理标准的基础数据,有助于减少边坡灾害造成的生命财产损失。
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引用次数: 3
Evaluation on Behavior Characteristics of a Pocketable Expansion Material for Ground Cavity Based on Wheel T racking Test Results 基于车轮履带试验结果的地面空腔可伸缩材料性能评价
IF 0.5 Q4 ENGINEERING, GEOLOGICAL Pub Date : 2018-01-01 DOI: 10.12814/JKGSS.2018.17.1.075
Jeongjun Park, 김주호, 김기성, Dongwook Kim, G. Hong
This paper described a results of dynamic stability by using wheel tracking test and unconfined compression test, in order to evaluate behavior characteristics on the developed pocketable expansion material for emergency restoration of ground cavity. The wheel tracking test result showed that the settlement increment ratio of the recovered ground by the expansion material was decreased compared to the sandy ground in high load condition. That is, it was confirmed that the expansion material was able to restrain the settlement due to the material stiffness, and the same results were obtained for the dynamic stability evaluation results. From the results of unconfined compression test, the pocketable expansion material was found to be able to fully support load on the restored cavity.
为评价所研制的用于地面空腔应急修复的可折叠膨胀材料的性能特性,采用车轮跟踪试验和无侧限压缩试验对其动稳定性进行了研究。车轮跟踪试验结果表明,在高荷载条件下,与砂土地基相比,膨胀材料恢复地基的沉降增量比减小。即证实了膨胀材料由于材料的刚度能够抑制沉降,动力稳定性评价结果也得到了相同的结果。无侧限压缩试验结果表明,可折叠膨胀材料能够完全支撑修复空腔的载荷。
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引用次数: 1
期刊
Journal of the Korean Geosynthetic Society
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