The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition
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The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition
Master of Engineering dissertationTRAN TUAN ANH (16ME136)Graduate School of Science and EngineeringSaitama University, JapanFebruary, 2018THE BUILD-UP The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition P OF PORE-AIR PRESSURE ASSOCIATED WITH W ATER INFILTRATION INTO GEOMATERLALS UNDER HEAVY RAINFALL CONDITIONA dissertation submitted to the Graduate School of Science and Engineering in partial fulfillment of the requirement of the degree of Master of EngineeringbyTR AN TUAN ANTI16ME136Supervised byP The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition rofessor Dr. Masaliiko OsadaRock Mechanics Laboratory' Graduate School of Science and Engineering Department of Civil Engineering Saitama UniversityJaThe build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition
pan1ABSTRACTWater infiltration into unsaturated soils is an important geotechnical problem related to large deformation and failure of natural slopes Master of Engineering dissertationTRAN TUAN ANH (16ME136)Graduate School of Science and EngineeringSaitama University, JapanFebruary, 2018THE BUILD-UP The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition nt and a decrease in suction. It is suggested that the pressure parameters play a significant role in investigation waler infiltration phenomena. Pore-air generally docs not impede infiltration rales or wetting front movement when the waler table is al depth. However, poreair entrapment is not often The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition considered as a function of water infiltration process but affects. Therefore, the study of waler infiltration into unsaturated soils becomes an inteThe build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition
resting topic due to the necessity of understanding the complex nonlinear interaction among the hydrological conditions, the hydraulic and pressure paMaster of Engineering dissertationTRAN TUAN ANH (16ME136)Graduate School of Science and EngineeringSaitama University, JapanFebruary, 2018THE BUILD-UP The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition ociated with the water infiltration into geomaterials as a function to develop a complete influence rating procedure of heavy rainfall triggering landslide in further studies.To this end. a scries of numerical simulation method associated with laboratory experiments based on the theory of multiphase The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition -flow in porous media were carried out. rhe laboratory experiments were conducted that there were two different column of sandy soil cases developed tThe build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition
o evaluate the influence of pore-air entrapment on infiltration under different initial conditions. The bottom of the soil column is bounded to make tMaster of Engineering dissertationTRAN TUAN ANH (16ME136)Graduate School of Science and EngineeringSaitama University, JapanFebruary, 2018THE BUILD-UP The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition which fit with the laboratory experiments to investigate the behavior of pore air pressure during waler infiltration in general. Besides, a column of sandy soil was conducted that assumes water rising from the base as the effect of water table with soil in open system. The soil surface approaches th The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition e atmosphere and there is no air escape from the base. The incoming water from the base force the water elevation toward the surface of the soil columThe build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition
n as the effect of capillary pressure.The results showed that under closed conditions the wetting front migrates significantly slower following a rapiMaster of Engineering dissertationTRAN TUAN ANH (16ME136)Graduate School of Science and EngineeringSaitama University, JapanFebruary, 2018THE BUILD-UP The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition ne to the soil surface and leak out as bubbles, which allows water absorbing to available pores space2until the welting front reaching the bottom of the soil column.The pore pressure behavior corresponds with the velocity of the movement of wetting front. In the closed system, pore air pressure jump The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition s up as fast as water infiltrating when it contacts to the soil surface. During the interval, pore air pressure that is under the wetting front is simThe build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition
ilar at any points within the soil system. Pore aừ pressure at a specific position within soil will decrease only when it contacts to the wetting fronMaster of Engineering dissertationTRAN TUAN ANH (16ME136)Graduate School of Science and EngineeringSaitama University, JapanFebruary, 2018THE BUILD-UP The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition rtionally to the depth. Pore air pressure also slows down the infiltration rate by the reduction of capillary pressure, the time lag between the pore air pressure at considered points indicates the velocity’ of advance of the wetting front. Resides, the soil will not be fully saturated until pore ai The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition r pressure is equal lo zero.Tn open system, the air phase contacts to the atmosphere, and pore air pressure is approximates* zero in entire time, rheThe build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition
pore air pressure can still affect to the migration of wetting fluid, but negligible. So that, the effect of pore air pressure can be ignored in the oMaster of Engineering dissertationTRAN TUAN ANH (16ME136)Graduate School of Science and EngineeringSaitama University, JapanFebruary, 2018THE BUILD-UP The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition s to the Graduate School of Science and Engineering, Department of Civil Engineering. Saitama University for the partial fulfilment of the degree in Master of Engineering. This dissertation would not have being a real fulfillment without the backing and corporation from various individuals through v The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition arious means. Tt is a pleasure to convey my gratitude to all of them.Tn the first place Ĩ owe my everlasting gratefulness to my supervisor. Professor.The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition
Dr. Masahiko Osada for his keen supervision. 1 take this opportunity to convey my heartiest gratitude to Professor. Dr. Masahiko Osada, my academic sMaster of Engineering dissertationTRAN TUAN ANH (16ME136)Graduate School of Science and EngineeringSaitama University, JapanFebruary, 2018THE BUILD-UP The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition t oasis of ideas and passions in science, which exceptionally inspire and enrich my growth as a student, a researcher and a scientist. Your patient guidance and valuable comments and making me well experienced on academic writing and resource handling.It is my pleasure to convey my noble thanks to A The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition ssociate Professor Dr. Tadashi Yainabe. Professor. Dr. Kawamoto Ken for valuable advices, special gratitude goes for Associate Professor. Dr. Chiaki TThe build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition
. Oguchi who gave US great occasions to travel many locations in Japan. Thanks for your guidance and their willingness to share experience with US. ItMaster of Engineering dissertationTRAN TUAN ANH (16ME136)Graduate School of Science and EngineeringSaitama University, JapanFebruary, 2018THE BUILD-UP The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition . These field visits helped to learn new approaches in gcolcchuical field and also, we could explore many places around Japan.1 appreciate the help that 1 got from Rock mechanics lab members as well as the friends of Geosphere Research Institute. Il is a pleasure to pay a special tribute lo KESCO. L The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition td. company especially Mr. Kuo Ozawa. Mr. Yuto Takahashi, and Mr. Dahai Mi who guide me in various aspects of numerical simulation with COMSOL MultiphThe build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition
ysics in my research work. Further it is my duty to remember Mr. Kenjiro Okada who being my tutor and a kind person in all my academic and nonacademicMaster of Engineering dissertationTRAN TUAN ANH (16ME136)Graduate School of Science and EngineeringSaitama University, JapanFebruary, 2018THE BUILD-UP The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition share with me all the lime.4My special thanks go to Asian Development Bank to offer me a valuable scholarship to study in a world first class country like Japan without any financial difficulties. I am very grateful to the international students, staff members of GRIS including Nara san. Foreign Stu The build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition dent Office with Yuko Mori san and Sachiko Shimodaira san. Saitama University International House, International affairs office and graduate school stThe build up of pore air pressure associated with water in filtration into geomaterials under heavy rainfall condition
aff and Japanese language teacher. Jonishi sensei for guide me the life in Japan.Master of Engineering dissertationTRAN TUAN ANH (16ME136)Graduate School of Science and EngineeringSaitama University, JapanFebruary, 2018THE BUILD-UPMaster of Engineering dissertationTRAN TUAN ANH (16ME136)Graduate School of Science and EngineeringSaitama University, JapanFebruary, 2018THE BUILD-UPGọi ngay
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