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Evaluation of excavation damaged zones(EDZs)in Horonobe Underground Research Laboratory(URL)

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 365-378页

作者： Koji Hata Sumio Niunoya Kazuhei Aoyagi Nobukatsu Miyara obayashi corporation Technology Research InstituteTechnology DivisionKiyoseTokyo204-8558Japan obayashi corporation Nuclear Facilities DivisionSinagawaTokyo108-8502Japan Japan Atomic Energy Agency Horonobe Underground Research CenterHoronobeHokkaido098-3224Japan

Excavation of underground caverns,such as mountain tunnels and energy-storage caverns,may cause the damages to the surrounding rock as a result of the stress *** this influenced zone,new cracks and discontinuities are created or propagate in the rock ***,it is effective to measure and evaluate the acoustic emission(AE)events generated by the rocks,which is a small elastic vibration,and permeability *** authors have developed a long-term measurement device that incorporates an optical AE(O-AE)sensor,an optical pore pressure sensor,and an optical temperature sensor in a single multi-optical measurement probe(MOP).Japan Atomic Energy Agency has been conducting R&D activities to enhance the reliability of high-level radioactive waste(HLW)deep geological disposal *** a high-level radioactive disposal project,one of the challenges is the development of methods for long-term monitoring of rock mass ***,in January 2014,the long-term measurements of the hydro-mechanical behavior of the rock mass were launched using the developed MOP in the vicinity of 350 m below the surface at the Horonobe Underground Research *** measurement results show that AEs occur frequently up to 1.5 m from the wall during *** addition,hydraulic conductivity increased by 2e4 orders of *** analysis revealed that the hydraulic behavior of the rock mass affected the pore pressure fluctuations and caused *** on this,a conceptual model is developed to represent the excavation damaged zone(EDZ),which contributes to the safe geological disposal of radioactive waste.

关键词： Excavation damaged zone(EDZ) Optical sensor Long-term monitoring Acoustic emission(AE) Shaft sinking

Development of a validation technique for road surface profile applicable to point cloud data

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Journal of road Engineering 2022年第2期2卷 114-123页

作者： Kazuya Tomiyama Yuki Yamaguchi Kazushi Moriishi Yuki Kotani Division of Civil and Environmental Engineering Kitami Institute of TechnologyKitami 090-8507Japan obayashi road corporation Tokyo 101-8228Japan Graduate School of Engineering Kitami Institute of TechnologyKitami 090-8507Japan

In recent years,various information and communication technology(ICT)devices measuring three-dimensional(3D)point cloud data have been developed and widely used for the application of pavement surface ***,ICT devices have generally been developed not only for measuring road surface profiles but for various geo-reference point *** this background,the validation of surface profiles acquired with ICT devices fulfils an important role in proving the reliability of measurement result composed by point *** study proposes a wavelet transform agreement(WTA)which involves a normalization factor of profile amplitude for further improvement in the wavelet-based coherence *** WTA analysis allows evaluating similarity/dissimilarity of two profiles considering both the location and wavelength *** this purpose,a terrestrial laser scanner(TLS),a mobile mapping system(MMS),and an unmanned aerial vehicle(UAV)are employed to prove the advantage of WTA in practical *** a result,the advantages of WTA analysis are clearly recognized in the optimization for the measurement interval of TLS,the multi-line measurement of MMS for ride quality improvement of a pavement,and the efficient operation of UAV in terms of the flight *** paper also shows the identification of aging development for surface roughness over time in terms of locations and *** findings help not only to guarantee the accuracy of profile measurements but to realize the sophisticated way of using 3D point clouds acquired with ICT *** outcomes of this study contribute to the increase of productivity for pavement works with improving the quality of surface profile measurement.

关键词： Surface profile Profile validation Point cloud Wavelet agreement Wavelet coherence

Evaluation of seismic behavior of box culvert buried in the ground through centrifuge model tests and numerical analysis

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Underground Space 2019年第2期4卷 147-167页

作者： Hitoshi Yatsumoto Yasuo Mitsuyoshi Yasuo Sawamura Makoto Kimura Maintenance Division Hanshin Expressway Company LimitedJapan obayashi corporation Construction DivisionJapan Department of Civil and Earth Resources Engineering Kyoto UniversityJapan

Japan has yet to establish a seismic design for road box culverts(RBCs)because past major earthquakes did not damage *** recent years,structures with enlarged sectional dimensions(the purpose of which is to optimize the internal space in RBCs)have become ***,the unknown seismic strength of such large RBCs makes RBC seismic designs increasingly *** seismic design methods have been developed for and applied to rectangular underground structures,e.g.,cut-and-cover tunnels,which are structurally similar to *** these methods are applicable to RBCs,it is uncertain whether they can be applied directly because there are currently no evaluation results from model tests on RBCs,which have unique structural features,e.g.,no haunch at the bottom of the ***,we verify a seismic behavior of an RBC and develop a method for evaluating it in order to establish a seismic design for *** conducted centrifuge model tests subjected to seismic force and a numerical analysis using an elastoplastic finite analysis method,in addition,we validated this analysis by comparing the test and analytical *** test results show RBCs will most likely develop rocking rotation when the ground strain exceeds approximately 0.08%.A comparison of the numerical and experimental results shows that this analysis can estimate the shear deformation behavior with approximately 90%accuracy in square cross-section ***,this analysis has tendency to underestimate the axial forces in each case and to overestimate the bending moments of some members in the case of wide cross-sections.

关键词： Box culvert Centrifuge model test Numerical analysis Shear deformation Rocking rotation

Decreasing inhaled contaminant dose of a factory worker through a hybrid Emergency Ventilation System:Performance evaluation in worst-case scenario

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Energy and Built Environment 2020年第3期1卷 319-326页

作者： Alicia Murga Zhengwei Long Sung-Jun Yoo Eisaku Sumiyoshi Kazuhide Ito Faculty of Engineering Sciences Kyushu UniversityJapan School of Environmental Science and Engineering Tianjin UniversityChina Technical Research Institute Obayashi CorporationJapan

Air pollution is detrimental to human health,causing several human *** industrial microenvironment generates high levels of indoor airborne pollutants,becoming a pervasive issue for *** is essential to im-prove the indoor air quality in this workplace by applying enhanced ventilation systems to minimize inhalation *** ventilation is used in industrial buildings because of its stratified air distribution and low ***,in case of accidental pollutant release,an enhancement is needed to minimize inhalation *** study proposes a hybrid emergency ventilation system using localized push-pull ventilation to improve the installed displacement ventilation system of a representative *** fluid dynamics was ap-plied to calculate steady-state indoor air flow and volume-averaged pollutant *** performance was evaluated in terms of source position;a computer simulated person was integrated to the building to confirm effectiveness against personal *** showed marked improvement in performance when push-pull technique was used:room-averaged concentration diminished up to 91%while ventilation rate only increased 4%.Inhaled pollutant mitigation was achieved but performance dependence against leakage source and personal position was confirmed.

关键词： Computational fluid dynamics Hybrid ventilation Industrial environment Computer simulated person Inhalation exposure

EPB Shield Tunneling for Twin Tunnels with Shallow Overburden under Railway in Operation

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EPB Shield Tunneling for Twin Tunnels with Shallow Overburde...

Evaluation of seismic residual capacity ratio for reinforced concrete structures

地下交通工程与工程安全——第五届中国国际隧道工程研讨会

作者： Yuichiro Terada Tadahiko Tuji Facilities Engineering Department Railway Management DivisionKeio Corporation Civil Engineering Department Obayashi Corporation

＜正＞Keio Line is an important part of the main railway in Tokyo Metropolitan rail transportation *** mitigate traffic congestion as well as to avoid potential traffic accidents railway crossing with roads on the ground,a project for underground double-track railway and underground stations was planed and has been under construction near Chofu Station. Two parallel tunnels were constructed in the project,in which existing railways on ground level will be shifted into the underground parallel *** EPB TBM（6.85m outer diameter） was used for both first and second tunnel *** TBM was turned around in a vertical shaft after the first tunnel driving,and then launched from the shaft for the second *** TBM driving was executed under the following special conditions;1) TBM driving beneath existing railway with shallow earth cover（the minimum earth cover is 4.7m that is less than the outer diameter of tunnel lining）,2) the ground bored by TBM which is mainly composed of the Tachikawa gravel formation containing boulders which is over 300mm,3) small clearance between the parallel tunnels （the minimum clearance was 400mm）,and 4) rotation and lift-up of the TBM in the narrow shaft beneath existing railway after the first tunnel driving（a weight of TBM was approximately 300ton）. Fuda station is constructed by cut and cover tunnel *** ground soil up to the tunnels was excavated in the station area first,and then,the tunnel linings were partially cut and removed to construct platform at the track level of the station. This paper summarizes the overall project and reports regarding the countermeasures against above mentioned conditions and the method of the platform level construction with cut and removal of the tunnel linings in Fuda station.

关键词： TBM driving beneath existing railway in service shallow overburden small clearance between tunnels rotation and lift-up of TBM partial cut and removal of the tunnel linings

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Resilient Cities and Structures 2023年第1期2卷 28-45页

作者： Alex V.Shegay Kota Miura Kisho Fujita Yu Tabata Masaki Maeda Matsutaro Seki Tokyo Institute of Technology 4259 NagatsutaMidori-kuYokohamaJapan obayashi Technical Research Institute 4-640 ShimokiyotoKiyoseJapan obayashi corporation 2-15-2 KonanMinato-ku TokyoJapan Kume Sekkei Co.Ltd 2-1-2 ShiomiKoto-ku TokyoJapan Tohoku University 12206-6-11 Aramaki AobaAoba-kuSendaiJapan Building Research Institute Tsukuba-shiTachihara 1Japan

Use of indices that quantify the seismic residual capacity of buildings damaged in earthquakes is one way to draw judgements on the building’s safety and possibility of future *** Japanese damage assessment guidelines,several approximate calculation methods exist to evaluate the residual capacity of buildings based on visually observed damage and simplifying assumptions on the nature of the building’s response mechanism and member *** these methods provide a useful residual capacity ratio that enables a‘relative’comparison be-tween buildings,the exact relationship to a physically meaningful residual capacity is *** aim of this study is to benchmark the‘approximations’of residual *** do so,a shake-table test was conducted on a 14 scale 4-storey RC structure and a residual capacity evaluation was undertaken based on observed damage *** the help of a numerical model,a benchmark residual capacity at each of the damage states is determined and compared to the approximate residual capacity calculation results via *** was found that approx-imate methods are generally accurate prior to yield but can become overly conservative *** assumptions of equal member deformation capacity used in the residual capacity ratio calculation was found to be suitable given constraints of rapid field evaluations.

关键词： Seismic residual capacity ratio Reinforced concrete Earthquake engineering Shake-table test Damage evaluation Numerical modeling

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GRIMSEL现场的气体渗透试验(英文)

岩石力学与工程学报 2006年第4期25卷 781-787页

作者： Fujiwara A Okamoto S Tsuboya T Vomvoris S Marschall P Ando K Shimura T 放射性废弃物管理基金会与研究中心(RWMC) 放射性废弃物处置公司(Nagra) obayashi corporation

自 1976 年以来,日本核废料管理基金会与研究中心(RWMC)一直在进行核废料处置的研究。最近,RWMC非常关注核废料处置库的监测、遥控以及现场勘查技术等重要的社会公众与技术问题。其中,处置库溢出气体是一项重要的安全可靠性评估项目。... 详细信息

自 1976 年以来,日本核废料管理基金会与研究中心(RWMC)一直在进行核废料处置的研究。最近,RWMC非常关注核废料处置库的监测、遥控以及现场勘查技术等重要的社会公众与技术问题。其中,处置库溢出气体是一项重要的安全可靠性评估项目。这项名为“工程屏障的气体渗透试验”(GMT)的研究是在瑞士 Nagra 的 Grimsel现场实验室进行的。GMT 集中研究在粮仓形的处置库中由核废料产生的气体在工程屏障中的渗透问题。在 Grimsel现场,一个按比例缩小的工程屏障库由一个具有透气孔的混凝土仓和砂–膨润土缓冲材料组成,缓冲材料被放置在一个专门建造的洞室中。混凝土仓直径为 2.5 m,高为 2.5 m,放置在直径为 4 m 的从上到下开挖而成的竖井中。在工程屏障饱和及水渗透试验之后,气体分两个阶段被注入地窖中。气体第一次被注入之后,重复进行水渗透试验,以便观察工程屏障库的变化。第二次气体注入的时候,在工程屏障及岩石圈中采用一种可以多点取样的鸡尾酒气体跟踪器。在气体注入之后,小心挖掘出工程屏障库,然后用各种方法来进行鉴定,并采用实验室以及建模程序来进行现场的模拟研究。

关键词：放射性废物处置超铀废物原位试验工程屏障体系气体渗透两相流模拟

Dynamic behavior and seismic retrofitting method for half-through steel arch bridges subjected to fault displacement

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Dynamic behavior and seismic retrofitting method for half-th...

AN ESTIMATION METHOD FOR BASEMAT UPLIFT BEHAVIOR OF NPP BUILDINGS

ARCH’10-the 6th International Conference on Arch Bridges

作者： Toshitaka Yamao Yoshie Tsujino Dept.of Civil and Environmental Engineering Kumamoto University obayashi corporation Co.Ltd.Institution

This paper presents the seismic behavior of dynamic response analyses and seismic retrofitting of half-through steel arch bridges subjected to fault *** the 1999 Taiwan Ji-Ji Earthquake wave and the fault displacement wave obtained from the time integral of the acceleration response wave were applied and the response behavior was *** dynamic response analyses were carried out using earthquake waves including fault displacement in transverse and longitudinal （expanding and shrinking） directions in order to investigate seismic behavior of bridge *** to the analytical results,it was found that the plastic members were clustered near the intersections of arch ribs and stiffened girders and at the union of stiffened girders and end ***,the effect of the proposed seismic retrofitting methods on the seismic behavior of the bridge model was discussed.

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AN ESTIMATION METHOD FOR BASEMAT UPLIFT BEHAVIOR OF NPP BUIL...