DataExpo GAKG DeepReport Navigation

Copyright©2015-2024 Acemap, Inc. Shanghai Jiao Tong University. All rights reserved.

沪ICP备18028330号

HM

Hiroaki Miyatake

Public Works Research Institute

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Masuo Kondoh

Civil Engineering Research Institute for Cold Region

Yoshihisa MIYATA

National Defense Academy of Japan

Toshinori Sakai

Mie University

Richard J. Bathurst

Royal Military College of Canada

Tomohiro Fujita

Aomori Prefectural Central Hospital

Tetsuya KUBO

Public Works Research Institute

Toshikazu Sawamatsu

Public Works Research Institute

Takehiko Nitta

Public Works Research Institute

Atsushi Nakane

LTT Bio-Pharma (Japan)

Hitoshi Ohta

Public Works Research Institute

Cooperative Institutions

Public Works Research Institute

Japan Society of Civil Engineers

The University of Tokyo

Hokkaido University

Civil Engineering Research Institute for Cold Region

Tokyo University of Science

Osaka University

Japan Society

Tohoku University

Kyoto University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

FEM Comparative Analysis on the Facing Rigidity in Geotextile Reiforced Soil walls

Proceedings of geosynthetics symposium (1995)

Atsushi Nakane M. Taki Hiroaki Miyatake Kiwako Dobashi

It has already been shown that the stability of the geotextile reiforced earth walls was improved with the use of rigid facings that brought about the reduction of overall deformation and the amount of tensile force generated in geotextile. To evaluate the effects of facing rigidity, stress-deformation behavior must be analyzed based on the interaction of facings, geotextiles, and soils.A numerical analysis using a two-dimensional elasto-plastic FEM taken account of the construction process was conducted to clarify various aspects of the behavior of a reinforced earth walls measuring 10.0m high. Three types of facings were analyzed: the wrapped-around wall face method, the concrete panel face method, the concrete block face method. In addition, the slope of wall was varied from 1:0.0 to 1:0.8 (pitch of 0.2). The results showed that facings performed using the block and panel face method, which provided higher rigidity than the wrapped-around wall face method, could be increased the stability of the reinforced earth walls under the characteristic bound coditions be satisfied:

Geotextile

Rigidity (electromagnetism)

10.5030/jcigsjournal1995.10.73

Cite

Citations (0)

Influence of transient flooding on steel strip reinforced soil walls

SOILS AND FOUNDATIONS (2015)

Yoshihisa MIYATA Richard J. Bathurst Yoshinori Otani Hitoshi Ohta Hiroaki Miyatake

10.1016/j.sandf.2015.06.018

Cite

Citations (6)

EXAMINATION OF EFFICIENT CORRESPONDING METHOD TO LARGE SCALE EMBANKMENT DISASTER

Geosynthetics Engineering Journal (2013)

Satoshi Miyagawa Tatsuya Kubo Yasunori Mori Hiroaki Miyatake

近年，豪雨や大規模な地震等が盛土等の災害を大規模化させ，社会的影響を拡大させている．災害時には，施工の効率性，経済性から大型土のうを用いた復旧が応急復旧として多くの現場で採用されている．過去の復旧事例より，大型土のうを用いた復旧は，平地に比べ制約条件の厳しいと思われる河川沿いや山地で多く採用されていることが確認された．大型土のうを用いた復旧は，仮設構造物であるため，本復旧時に撤去することが分かっていても応急復旧として有効な方法である．本研究では，過去の災害復旧事例を分析し，大型土のうの復旧現場でのニーズを把握するとともに，大型土のうを存置させてそのまま本復旧へ適用できるよう，復旧方法を提案した．そして提案した復旧方法が本復旧への適用できる可能性を確認した．

10.5030/jcigsjournal.28.45

Cite

Citations (2)

The field performance of a geotextile reinforced soil wall with concrete facing blocks

Proceedings of geosynthetics symposium (1995)

Tomoki NAKAJIMA Yuji Ohki Kenji Oda Hiroaki Miyatake Kiyomasa Dobashi

It is known that high stability and deformation control can be assured in geotextile reinforced soil wall. if facingrigidity is improve. To verify this, a field performance test was conducted on a 8-meter high soil wall, with a face of large concrete blocks 50cm high, 100cm wide and 35cm thick. Information obtained through measurement during construction of the reinforcement materials, horizontal displacement of wall surface, settlement of wall foundation and earth fill, subgrade reaction, and lateral earth pressure is as follows.•Approximately 1% of maximum reinforcement strain, measured at the completion of construction, is acceptable for the stability of the reinforced soil wall.•Concrete block walls are easy to construct because of their self-supporting characteristics.•Sub-reinforcements contribute greatly to the stability of the reinforcement soil wall.•A 65-mm horizontal displacement in the forward direction is observed at the middle of the wall upon completion•The foundation subgrade reaction measured at the rear of the wall is equivalent to the dead weight of the concrete blocks.•The horizontal displacement of the wall is related to foundation settlement, it can be concluded that taking appropriate design measures is essential for soil wall foundation of this type.

Geotextile

Foundation (evidence)

Settlement (finance)

Lateral earth pressure

Geosynthetics

Mechanically stabilized earth

10.5030/jcigsjournal1995.10.47

Cite

Citations (2)

Seismic behaviour of a large-scale concrete-block retaining wall

E3S Web of Conferences (2019)

Noboru Satô Toshikazu Sawamatsu Takehiko Nitta Hiroaki Miyatake Kazuhito Kondo

In this study, an inclined model experiment and finite element analyses were conducted to evaluate the failure mode and seismic response of a dry-type large-scale concrete-block retaining wall (LCBW). In the experiment, the objective was to reproduce the sliding between concrete blocks that was observed in past cases LCBW damage in order to characterise the behaviour until failure. A numerical simulation corresponding to the experimental conditions was conducted by the finite element method (FEM). Dynamic analyses were also performed by FEM to investigate the seismic response of the concrete blocks under various ground conditions. The experimental results revealed that slip between the concrete blocks caused brittle failure of the LCBW. In the FEM simulation, the joint elements reproduced the experimentally observed sliding between the concrete blocks. A dynamic simulation of the full-scale model revealed that significant sliding and rocking of the concrete block occur in a dry-type LCBW. These findings indicate that stress concentration may occur at the heels of the concrete blocks during an earthquake.

Brittleness

Full scale

Seismic loading

10.1051/e3sconf/20199216007

Cite

Citations (0)

BENDING DEFLECTION OF A GROUND ANCHOR FOLLOWING A LANDSLIDE

Journal of Japan Society of Civil Engineers Ser C (Geosphere Engineering) (2022)

Yoshihiro Tsunekawa Toshinori Sakai Hiroaki Miyatake Masuo Kondoh

グラウンドアンカー(以下,アンカー)は,地すべり等による想定以上の外力に対して,アンカーの緊張力を増加させながら抑止効果を発揮する一方で,アンカーの引張り部は,抑止杭と同様にすべり面で変形し,曲げやせん断方向の外力を受ける可能性が考えられる.しかし,不可視な地中部のアンカーの変形状況の確認は困難であることから,地すべり変位によるアンカーの変形や変形による抑止機能への影響について,これまで十分な調査や評価は行われていなかった.本論では,アンカー破断が確認された地すべり地において,アンカーの残存緊張力観測やファイバースコープを用いた調査を行い,地すべり変位によるアンカーの破断状況や変形状況を明らかにするとともに,アンカーの変形によるアンカー性能への影響について検討を行った.

Ground movement

10.2208/jscejge.78.2_96

Cite

Citations (0)

1g tilt-table test on seismic stability of damaged geogrid reinforced soil wall

Toru Kubo Tomohiro Fujita Hiroaki Miyatake Atsushi Nakane Yasumitsu Miyata

Geogrid

Earthquake shaking table

Cite

Citations (0)

Applicability of Mobile Photogrammetry to Measure Facing Displacement of Reinforced Soil Walls

Geo-Congress 2019 (2019)

Takanori FUJITA Hiroaki Miyatake Yoshihisa MIYATA

Management of the earth structures is important to ensure proper functioning of roads. Given that Japan is home to many earth structures, the basic premise of earth structure management is to prevent traffic hazards by conducting regular inspections. New inspection methods are required to reduce the use of human resources involved in earth structure management. This article discusses the applicability of mobile photogrammetry to the inspection of reinforced soil walls. A photogrammetry tool was fixed to a vehicle to measure the surface geometry of the target. The test wall was an 8.0-m high geogrid reinforced soil wall. Mobile photogrammetry data were validated by comparing the measurements obtained using the proposed method and a classical total station. The results of the mobile photogrammetry field test showed that when the speed of the mobile photogrammetry vehicle was 0 or 30 km/h, measurement errors decreased with increase in the number of pictures used in the analysis. Mobile photogrammetry results using six pictures were less affected by vehicle speed. These results support the use of the proposed system in future inspections of earth structures.

10.1061/9780784482087.025

Cite

Citations (0)

新たな地質・地盤分野の研究開発大規模な土砂災害に対応した新しい災害復旧技術の実大実験

土木技術資料 (2017)

Hiroaki Miyatake Sawamatsu Toshikazu Inoue Genki

Cite

Citations (0)

Relationship between anchor tension load and ground surface and underground temperature in winter

Japan Society of Civil Engineers eBooks (2021)

Toshinori Sakai Hiroaki Miyatake Masuo Kondoh Hiroto Koide Masahiko Yamaki

Tension (geology)

Cite

Citations (0)