Japanese Geotechnical Society Special Publication最新文献_第4页

Visualization of microstructure and measurement of mass transport parameters for granulated bentonite mixtures 颗粒状膨润土混合物微观结构可视化及传质参数测量

Japanese Geotechnical Society Special Publication Pub Date : 2021-10-12 DOI: 10.3208/jgssp.v09.cpeg121

M. Nazir, A. Matsuno, Takeshi Saito, K. Kawamoto, T. Sakaki

{"title":"Visualization of microstructure and measurement of mass transport parameters for granulated bentonite mixtures","authors":"M. Nazir, A. Matsuno, Takeshi Saito, K. Kawamoto, T. Sakaki","doi":"10.3208/jgssp.v09.cpeg121","DOIUrl":"https://doi.org/10.3208/jgssp.v09.cpeg121","url":null,"abstract":"Bentonite is often considered as one of the key components of the Engineered Barrier System (EBS) for the radioactive waste disposal; mechanical, thermal, and hydraulic behaviors of bentonite should be thoroughly studied to ensure the emplaced the quality and to control the performance of EBS. This study examined the effects of dry density and relative humidity (RH) on microstructure and mass transport characteristics of Granulated Bentonite Mixtures (GBM). The tested GBM samples were prepared by sieving and grading Japanese bentonite (trade name: OK Bentonite, Kunimine Industries, Japan). For dry density-controlled conditions, air-dried GBM samples (RH 60%, water content of 6.38% by weight) were packed at six different dry densities ranging from 1.25 to 1.75 g/cm. The samples for humidity-controlled conditions were prepared at the dry density of 1.45 g/cm and stored at RH 90% (0 to 12 weeks). A microfocus X-ray computerized tomography (MFXCT) scanning apparatus was used to visualize the microstructures of packed tested samples. For each tested sample, the mass transport parameters of gas diffusivity (Dp/Do), air permeability (ka), thermal conductivity (λ), and volumetric heat capacity (C) were measured. The results indicated that dry density greatly affected the CT brightness values of GBM; the histogram of CT brightness well captured the internal distribution of density and the CT brightness homogenized more with increasing in dry density. The measured Dp/Do and ka. were mainly controlled by the dry density. On the other hand, the thermal properties such as λ and C were governed both dry density and RH.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131565546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Lysimeter tests for change in leachate quality from the modified removed soil: interaction between soil and polymer modification agent 从改性去除的土壤中渗滤液质量变化的渗滤液试验:土壤和聚合物改性剂之间的相互作用

Japanese Geotechnical Society Special Publication Pub Date : 2021-10-12 DOI: 10.3208/jgssp.v09.cpeg089

Jialin Mo, Kazuto Endo, Hiroyuki Arai, Takuya Miura, Kosuke Nakamura

{"title":"Lysimeter tests for change in leachate quality from the modified removed soil: interaction between soil and polymer modification agent","authors":"Jialin Mo, Kazuto Endo, Hiroyuki Arai, Takuya Miura, Kosuke Nakamura","doi":"10.3208/jgssp.v09.cpeg089","DOIUrl":"https://doi.org/10.3208/jgssp.v09.cpeg089","url":null,"abstract":"The removed soil generated from decontamination projects in Fukushima Prefecture is being transported to the interim storage facility (ISF) at present. In the ISF, modification agent such as water-absorbing polymer is used to improve handling of the removed soil during the separation process before storage. The expansion characteristic of the water-absorbing polymer agent might change the hydraulic property of the soil which will affect the leaching behavior. In addition, degradation of organic matter contained in the removed soil might influence the leachate quality as well. Thus, it is necessary to evaluate the environmental safety of the modified removed soil for safe storage in the ISF and its potential reuse in the future. In this study, two lysimeter tests on modified and unmodified removed soil was conducted to investigate its leachate quality. These tests lasted more than 400 days (liquid/solid ratios greater than 3.5). The highest 137 Cs concentration in leachate from the unmodified soil was 6.6 Bq/L at 250 days, and the accumulated leaching ratio was 0.09%. In leachate from the modified soil (addition of 3% water-absorbing polymer agent powder), the highest 137 Cs concentration was 3.3 Bq/L and the leaching ratio was 0.046%, a reduction by half. Leaching of 134 Cs from both soils was extremely low. The soil modification resulted in accumulated leaching of total organic carbon that was 60 % higher and leaching of K + and ammonia nitrogen (NH4-N) that was 35 % lower, respectively. No expansion of soil volume was observed after modification.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120926728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Feasibility of total system for ground protection – power generation - construction waste material reusing 接地保护-发电-建筑垃圾再利用总系统的可行性

Japanese Geotechnical Society Special Publication Pub Date : 2021-10-12 DOI: 10.3208/jgssp.v09.cpeg014

Shoji Yokohama

{"title":"Feasibility of total system for ground protection – power generation - construction waste material reusing","authors":"Shoji Yokohama","doi":"10.3208/jgssp.v09.cpeg014","DOIUrl":"https://doi.org/10.3208/jgssp.v09.cpeg014","url":null,"abstract":"In order to maintain the current standard of living without deteriorating the global environment, it is necessary to develop and spread the effective power generation methods using clean energy. Rational ground reinforcement is necessary to minimize the ground damage caused by frequent natural disasters such as earthquakes. It is important to actively reuse the construction waste material for reducing the economic cost of civil works. In this study, one of the useful tools for constructing and maintaining a recycling-oriented society is considered. First, a concept of the total system to perform both ground reinforcement and electric power generation using the recycled asphalt pavement material and newly prepared T-shaped unit is proposed. The T-shaped unit that is referred as a PG unit in this study mounts the electric circuit with Peltier device. A series of the field monitoring for electric power generation and the laboratory test for the mechanical properties of protected ground are conducted for discussing the feasibility of the proposed total system. The results of the field monitoring show that the newly prepared PG unit can generate the electric power by using the temperature on the ground surface. In the laboratory test, it is also confirmed that the bearing capacity of the ground can be improved by using recycled asphalt pavement material and PG unit waste. The both results of field monitoring and laboratory test imply that the proposed total system can be realized.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"50 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134426373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study of the effect of salinity and surfactant on mass transfer characteristics of oxygen micro-nano bubbles 盐度和表面活性剂对氧微纳气泡传质特性影响的实验研究

Japanese Geotechnical Society Special Publication Pub Date : 2021-10-12 DOI: 10.3208/jgssp.v09.cpeg078

Mei Bai, Zhi-bin Liu, Jinpeng Zhang, Yanjun Du, Liangliang Lu, Z. Zhu

引用次数: 1

Alkaline Degradation of GMZ Bentonite as HLW Barrier in China GMZ膨润土作为高阻水剂的碱性降解研究

Japanese Geotechnical Society Special Publication Pub Date : 2021-10-12 DOI: 10.3208/jgssp.v09.cpeg031

Yanmei Tong, Huyuan Zhang

{"title":"Alkaline Degradation of GMZ Bentonite as HLW Barrier in China","authors":"Yanmei Tong, Huyuan Zhang","doi":"10.3208/jgssp.v09.cpeg031","DOIUrl":"https://doi.org/10.3208/jgssp.v09.cpeg031","url":null,"abstract":"Gaomiaozi (GMZ) bentonite is a suitable buffer material for underground repository barrier of high-level waste (HLW) in China. Strong alkaline cementitious material formed from the corroded lining concrete by groundwater will penetrate into bentonite buffer, meanwhile, the temperature of the barrier will rise under the radiant heat from the decay of the radionuclide. The laboratory tests were conducted to simulate the diffusion of KOH solution into bentonite under elevated temperature conditions and investigate the changes in mineral composition and microstructure of GMZ bentonite by X-ray diffraction (XRD), nitrogen adsorption and scanning electron microscopy (SEM). The results confirmed that alkaline dissolution of montmorillonite minerals in GMZ bentonite is increased with both pH value of the alkaline solution and the temperature. For example, montmorillonite content decreased from initial 44.4% to 25.9% in severe situation. The degree of alkaline corrosion of bentonite is inversely proportional to the distance between the contact interface of bentonite and alkaline solution and visible macro fissures were observed by naked eyes at the interface. Within 2mm of the surface, the wing-like gels produced by montmorillonite hydration were dissolved apparently; and beyond 4mm, the bentonite retained its original microstructure. The results reveal the adverse effects of alkaline corrosion of GMZ bentonite on the long-term performance of buffer barriers should be paid great attention.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133577873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Relative contribution of chemico-osmosis and electro-osmosis to the experimental determination of the reflection coefficient in semipermeable clay soils 化学渗透和电渗透对半透性粘土反射系数实验测定的相对贡献

Japanese Geotechnical Society Special Publication Pub Date : 2021-10-12 DOI: 10.3208/jgssp.v09.cpeg012

N. Guarena, A. Dominijanni, M. Manassero

{"title":"Relative contribution of chemico-osmosis and electro-osmosis to the experimental determination of the reflection coefficient in semipermeable clay soils","authors":"N. Guarena, A. Dominijanni, M. Manassero","doi":"10.3208/jgssp.v09.cpeg012","DOIUrl":"https://doi.org/10.3208/jgssp.v09.cpeg012","url":null,"abstract":"The containment performance of bentonite-based barriers is known to be influenced by the semipermeable membrane behaviour of the bentonite, which arises from the electrical interactions between the clay particles and the ionic species dissolved in the pore solution. Most of the experimental research conducted to date has provided evidence of the clay membrane behaviour, the extent of which is typically quantified through the reflection coefficient,  , when the permeant (electrolyte) solution contains a monovalent or divalent salt. Under such conditions, the osmotic counter-flow of solution is controlled to a great extent by the solute exclusion, which is also referred to as the chemico-osmotic effect. However, theoretical simulations of coupled solute transport and solvent flow suggest that, when two or more cations with different diffusivities are contained in the permeant solution, the electro-osmotic effect, which stems from the condition of null electric current density, can be comparable to or even greater than the chemico-osmotic effect. The relative importance of the aforementioned contributions to multi-electrolyte systems is examined herein through the interpretation of laboratory test results from the literature pertaining to a bentonite-amended clay soil permeated with aqueous mixtures of potassium chloride (KCl) and hydrochloric acid","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130284601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Assessment of heavy metal contaminated agricultural soils affected by mining in Ganzhou China 赣州市采矿对农业土壤重金属污染的影响评价

Japanese Geotechnical Society Special Publication Pub Date : 2021-10-12 DOI: 10.3208/jgssp.v09.cpeg073

Liang Wang, Jiawei Wu, Jing Hua, Hao Ding, H. Xie, Zhilin Sun, Zhan-hong Qiu

{"title":"Assessment of heavy metal contaminated agricultural soils affected by mining in Ganzhou China","authors":"Liang Wang, Jiawei Wu, Jing Hua, Hao Ding, H. Xie, Zhilin Sun, Zhan-hong Qiu","doi":"10.3208/jgssp.v09.cpeg073","DOIUrl":"https://doi.org/10.3208/jgssp.v09.cpeg073","url":null,"abstract":"Soil heavy metal contamination caused by mining is a significant issue in China. The site of this study is located in Ganzhou of Jiangxi province in China. 102 soil samples were collected along the Yangmeijiang River. ICP-MS was used to obtain heavy metal concentrations in the soils. Significant contamination was found in the agriculture soils adjacent to the river and near mining industries. The heavy metal concentrations were high at depths of 20 cm and 40 cm. According to geo-accumulation index I geo , the soils were extremely polluted with Cd ( I geo = 4–7), heavily polluted with As ( I geo = 2–4), moderately to heavily polluted with Pb, Zn and Cu ( I geo = 0–4) and virtually unpolluted with Ni, Cr and Hg ( I geo = -3–1). These results may be a result of large amounts of As, Cd, Pb, Cu and Zn being produced by nearby copper heap leach facilities. Based on USEPA method for health risk assessment, with ingestion being the major pathway for health risks, heavy metals pose a non-carcinogenic risk to adults ( HQ max = 2.87, CR max = 4.25 × 10 - 4 ), but pose both non-carcinogenic and carcinogenic risk to children ( HQ max = 20, CR max = 1.15×10 -3 ). Overall, As, Pb and Cr pose the primary health risks for the soils in the study area.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129632331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anaerobic batch leaching tests of shale rock grains 页岩颗粒厌氧间歇浸出试验

Japanese Geotechnical Society Special Publication Pub Date : 2021-10-12 DOI: 10.3208/jgssp.v09.cpeg153

Tomohiro Kato, Yusuke Masaki, Lincoln W. Gathuka, A. Takai, T. Katsumi

引用次数: 0

Geotechnical and environmental aspects of landfill reclamation: a case study of an old municipal solid waste landfill in Poland 填埋场回收的岩土工程和环境方面:波兰一个旧城市固体废物填埋场的案例研究

Japanese Geotechnical Society Special Publication Pub Date : 2021-10-12 DOI: 10.3208/jgssp.v09.cpeg027

E. Koda, A. Podlasek, P. Osiński, A. Markiewicz, M. Vaverková

{"title":"Geotechnical and environmental aspects of landfill reclamation: a case study of an old municipal solid waste landfill in Poland","authors":"E. Koda, A. Podlasek, P. Osiński, A. Markiewicz, M. Vaverková","doi":"10.3208/jgssp.v09.cpeg027","DOIUrl":"https://doi.org/10.3208/jgssp.v09.cpeg027","url":null,"abstract":"Reclamation of landfills requires solutions to many unusual issues in the field of geotechnics and environmental engineering. The aim of the paper was to present some examples of reclamation works aimed at reducing the impact of an old municipal solid waste landfill on the soil-water environment and ensuring geotechnical safety. The article discusses several technical solutions applied in shaping the landfill body and strengthening the stability of the slopes. Moreover, some methods of reducing the spread of pollutants within the landfill site were presented. The article presents an example of a landfill located in difficult hydrogeological conditions, which for many years of operation did not have any systems applied for the purpose of protection from contamination. Based on the results of monitoring and numerical modeling, a beneficial effects of reclamation works on the improvement of groundwater quality and conditions of landfill slope stability were demonstrated. It was also shown that the application of a vertical barrier and a leachate drainage system have a positive effect on the improvement of the condition of plant communities in the landfill surroundings. It was concluded that reclamation works do not essentially change the function of the landfill but reduce its negative impact on the environment, in particular by limiting the spread of pollutants into the soil-water environment, protecting the slopes from erosion, reducing dust, increasing evapotranspiration and improving landscape value.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"05 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127243120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Formation of pyromorphite by hydroxyapatite in soil during lead migration through water-unsaturated soils 铅在水不饱和土壤中迁移过程中羟基磷灰石在土壤中形成焦闪石

Japanese Geotechnical Society Special Publication Pub Date : 2021-10-12 DOI: 10.3208/jgssp.v09.cpeg052

M. Katoh, Kazuki Hamada

引用次数: 2