Quarterly Journal of Engineering Geology and Hydrogeology最新文献_第2页

Quantifying CPT cone factors in clays derived from weathered mudstone 风化泥岩粘土中CPT锥因子的定量分析

4区工程技术

Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-11-10 DOI: 10.1144/qjegh2023-014

Kevin M. Briggs, Yuderka Trinidad González, William Powrie, Simon Butler, Nick Sartain

{"title":"Quantifying CPT cone factors in clays derived from weathered mudstone","authors":"Kevin M. Briggs, Yuderka Trinidad González, William Powrie, Simon Butler, Nick Sartain","doi":"10.1144/qjegh2023-014","DOIUrl":"https://doi.org/10.1144/qjegh2023-014","url":null,"abstract":"The empirical interpretation of cone penetration test (CPT) cone factors ( N k ) can be subject to considerable variability for clays derived from weathered mudstones, leading to significant deviations in the estimation of undrained shear strength ( S u ). This paper presents a comparison of triaxial and CPT data from a site investigation in clays derived from weathered mudstones in central England. Corrected cone factors ( N kt,UU ) were derived from a one-to-one comparison of 94 pairs of unconsolidated, undrained triaxial and CPT data from equivalent depths. The performance of the cone factors was evaluated using a training set (75 pairs) and a test set (19 pairs). A parametric study was used to explore the variability of N kt,UU , quantified using the coefficient of variation (COV Nkt,UU ), for varied separation distance thresholds ( D s ) between individual triaxial and CPT data. The absolute deviation between the laboratory shear strength ( S u(Lab) ) and that predicted from CPT profiles (S u(CPT) ) was not sensitive to N kt,UU values in the range 25 < N kt,UU < 31. The parametric study showed that D s could be increased from 50 to 250 m, to include more data pairs for estimates of N kt,UU , without substantially increasing COV Nkt,UU .","PeriodicalId":20937,"journal":{"name":"Quarterly Journal of Engineering Geology and Hydrogeology","volume":"76 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135088524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of energy dissipation characteristics and numerical simulation of surrounding rock control for backfill combinations with different ash-sand ratios 不同灰砂比回填组合围岩控制能量耗散特性分析及数值模拟

4区工程技术

Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-11-10 DOI: 10.1144/qjegh2023-057

Kang Zhao, Qizheng Huang, Jun Wu, Yajing Yan, Jian Yang, Fujin Ning, Xiangqing Tian, Lang Liu, Yongbo Ji

{"title":"Analysis of energy dissipation characteristics and numerical simulation of surrounding rock control for backfill combinations with different ash-sand ratios","authors":"Kang Zhao, Qizheng Huang, Jun Wu, Yajing Yan, Jian Yang, Fujin Ning, Xiangqing Tian, Lang Liu, Yongbo Ji","doi":"10.1144/qjegh2023-057","DOIUrl":"https://doi.org/10.1144/qjegh2023-057","url":null,"abstract":"To reduce the economic cost of backfilling a mine, layers of cemented materials with different ash sand ratios are often used to backfill the void. In this study, we explored the damage evolution mechanism from the energy consumption point of view for backfill and rock combination with different ash sand ratios, and introduced the strength dissipation rate, damage value parameter and elastic strain energy rate to achieve the definition of damage in the specimens, as well as the characterization of the energy accumulation effect. In addition, the layered backfilling of the assemblage was simulated using FLAC 3D software. The results show that: (1) the elastic strain energy rate can reflect the accumulation ability of the strain energy of the specimen; the larger the strain energy rate, the stronger the accumulation ability; (2) the damage evolution of the backfill–backfill combination is divided into stages: initial damage repair stage, damage stable development stage, damage accelerated development stage and residual damage stage; and (3) the top layer with an ash/sand ratio of 1:4, the middle layer with an ash/sand ratio of 1:8 and the bottom layer with an ash/sand ratio of 1:10 is the optimal backfilling scheme. This study can provide a theoretical reference for the backfilling of a hollow area.","PeriodicalId":20937,"journal":{"name":"Quarterly Journal of Engineering Geology and Hydrogeology","volume":"63 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135092444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cross-scale study of pore fractal characteristics and pore structure of weathered granite 风化花岗岩孔隙分形特征及孔隙结构的跨尺度研究

4区工程技术

Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-11-08 DOI: 10.1144/qjegh2023-075

Kang Zhao, Jiale Chen, Jun Wu, Yajing Yan, Qizheng Huang, Qiang Nie, Weiling Xiao

{"title":"Cross-scale study of pore fractal characteristics and pore structure of weathered granite","authors":"Kang Zhao, Jiale Chen, Jun Wu, Yajing Yan, Qizheng Huang, Qiang Nie, Weiling Xiao","doi":"10.1144/qjegh2023-075","DOIUrl":"https://doi.org/10.1144/qjegh2023-075","url":null,"abstract":"Weathering of granite leads to weakening of its crushing and mechanical properties, as well as changes in mineral composition. In order to investigate the correlation between the effects of weathering on granite and the characterization of the pore structure at the micro- and fine-scale, in this paper the pore structure of weathered granite is tested by the NMR technique. The pore distribution characteristics of weathered granite were explored in conjunction with T 2 spectral relaxation time and fractal theory. The microstructure of weathering-prone granite was monitored using scanning electron microscopy equipment. The results show that the pores can be classified into the three categories of small, medium and large pores based on their pore size distribution characteristics. Weathered granite has fractal features in the mesopores and macropores. Compared with unweathered granite, weathered granite has significantly more small pore throats and fewer medium and large pore throats, which expand into microfissures and micropores under conditions of weathering. The microstructure of weathered granite is mainly flaky and shell-like, with good connectivity, resulting in the poor overall structure of weathered granite.","PeriodicalId":20937,"journal":{"name":"Quarterly Journal of Engineering Geology and Hydrogeology","volume":" 24","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135293553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Geological and Geotechnical Information System (GEO-GIS) for urban planning and its application to the Acıpayam Basin (Denizli-Turkey), with some observations from Mw 5.5 earthquake on 20 March, 2019 用于城市规划的地质和岩土信息系统(GEO-GIS)及其在Acıpayam盆地(土耳其denizli)的应用，以及2019年3月20日5.5级地震的一些观测数据

4区工程技术

Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-11-08 DOI: 10.1144/qjegh2022-065

Halil Kumsar, Tuğba Sarayköylü

{"title":"A Geological and Geotechnical Information System (GEO-GIS) for urban planning and its application to the Acıpayam Basin (Denizli-Turkey), with some observations from Mw 5.5 earthquake on 20 March, 2019","authors":"Halil Kumsar, Tuğba Sarayköylü","doi":"10.1144/qjegh2022-065","DOIUrl":"https://doi.org/10.1144/qjegh2022-065","url":null,"abstract":"There are many site investigation projects used for the urban planning of a city. They are archived in hard copy or scanned in image files stored on computers. In this study, geological, geotechnical and geophysical data obtained from different site investigation projects in the Acıpayam district were evaluated in the same coordinate system using a geological and geotechnical information system (GEO-GIS) computer program. The Acıpayam GEO-GIS database includes field tests in 82 boreholes, 85 observation pits, laboratory test results of soil samples, 99 seismic refraction measurements and 70 microtremor measurements. Required information from the database can be displayed at its spatial coordinates on a base map and new maps can also be drawn using the GEO-GIS database system. Resultant maps drawn using the Acıpayam GEO-GIS database show that in the northern and eastern parts of the Acıpayam district, where the Oğuz, Kırca, Yassıhöyük, Apa, Ovayurt, Karahüyük, Ucarı and Gedikli villages are located, weak soil layers exist. This means that some damage may be caused to adobe and masonry buildings in the villages during shaking associated with strong earthquakes, as observed after the 5.5 (M w ) earthquake that occurred on 20 March 2019. The Acıpayam GEO-GIS database system is a useful tool for engineers and planners that can assist in drawing GIS-produced maps for geotechnical evaluations of the basin. These maps can be used in decision-making projects for urban planning. Thematic collection: This article is part of the Leading to Innovative Engineering Geology Practices collection available at: https://www.lyellcollection.org/topic/collections/leading-to-innovative-engineering-geology-practices","PeriodicalId":20937,"journal":{"name":"Quarterly Journal of Engineering Geology and Hydrogeology","volume":" 15","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135293671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Remediating the sky: the role of geoenvironmental engineers and applied geoscientists in geochemical carbon dioxide removal 修复天空:地球环境工程师和应用地球科学家在地球化学二氧化碳去除中的作用

4区工程技术

Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-11-06 DOI: 10.1144/qjegh2023-053

P. Renforth

{"title":"Remediating the sky: the role of geoenvironmental engineers and applied geoscientists in geochemical carbon dioxide removal","authors":"P. Renforth","doi":"10.1144/qjegh2023-053","DOIUrl":"https://doi.org/10.1144/qjegh2023-053","url":null,"abstract":"The largest environmental remediation project in human history has begun, that of removing hundreds of billions of tonnes of carbon dioxide (CO 2 ) from the atmosphere over the coming century. This removal, together with deep and rapid emissions reduction, will be essential in preventing dangerous climate change. This briefing introduces the field of geochemical CO 2 removal (gCDR), which proposes to accelerate the natural reaction of atmospheric CO 2 with rocks or anthropogenic materials. It also explores the critical role geoenvironmental engineers and geoscientists will have in researching and deploying these technologies. While currently at an early stage of development, it is possible that gCDR will operate at a global scale (billion tonnes of CO 2 per year) by mid/late-century, resulting in an industry that generates $100s billions to $1 trillion in annual revenue, equivalent in scale to the present day oil industry. The core technical competencies of this industry will be derived from geoscience disciplines requiring the contribution of thousands and possibly tens of thousands of workers globally. To realise these opportunities, our community needs to lead in the development of gCDR, help to pioneer its deployment, create standards for monitoring, and verification, and incorporate gCDR into existing education programmes and professional development. Thematic collection: This article is part of the Climate change and resilience in Engineering Geology and Hydrogeology collection available at: https://www.lyellcollection.org/topic/collections/Climate-change-and-resilience-in-engineering-geology-and-hydrogeology","PeriodicalId":20937,"journal":{"name":"Quarterly Journal of Engineering Geology and Hydrogeology","volume":"3 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135634289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gypsum and rice husk ash for sustainable stabilization of forest road subgrade 石膏和稻壳灰用于森林公路路基的可持续稳定

4区工程技术

Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-10-19 DOI: 10.1144/qjegh2023-008

Ebrahim Sharifi Teshnizi, Mehdi Mirzababaei, Jafar Karimiazar, Reza Arjmandzadeh, Kamran Mahmoudpardabad

{"title":"Gypsum and rice husk ash for sustainable stabilization of forest road subgrade","authors":"Ebrahim Sharifi Teshnizi, Mehdi Mirzababaei, Jafar Karimiazar, Reza Arjmandzadeh, Kamran Mahmoudpardabad","doi":"10.1144/qjegh2023-008","DOIUrl":"https://doi.org/10.1144/qjegh2023-008","url":null,"abstract":"Forest roads are crucial for economic development and resource accessibility, especially in regions with extensive wood demand driven by construction growth. These roads require consistent maintenance to prevent structural issues, even though they experience lower traffic. Traditionally, gypsum has been used for soil stabilization due to its cation exchange capability with clay minerals and flocculation properties. However, its water solubility in wet conditions necessitates innovative solutions. This study explores a novel approach by combining gypsum with rice husk ash (RHA), an abundant agricultural waste, to address the challenges posed by expansive and low-bearing clay soils in forest road construction. In this study, an expansive soil with high plasticity and swelling potential is treated with varying combinations of RHA (5%-20%) and gypsum (2%-6%), followed by curing for 7, 15, and 30 days. Mechanical property tests revealed reduced plasticity and swelling pressure, alongside increased unconfined compressive strength. Microscopic analysis illustrated the formation of a calcium silicate hydrate (CSH) gel and Calcium Alumino Silicate Hydrate (CAH) gel, which possibly contributes to improved stability. This research underscores the potential of sustainable soil stabilization using gypsum and RHA synergy to fortify forest roads against expansive clay soil challenges, promoting eco-friendly and resilient infrastructure solutions.","PeriodicalId":20937,"journal":{"name":"Quarterly Journal of Engineering Geology and Hydrogeology","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135778659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Initial Assessment of Soil Liquefaction Potential for Selected Sites in Hilla City, Babylon Governorate, Iraq 伊拉克巴比伦省希拉市选定地点土壤液化潜力初步评估

4区工程技术

Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-10-12 DOI: 10.1144/qjegh2023-076

Abdul-Kareem H. Al-Rubaiee, Mohanad R. A. Al-Owaidi

引用次数: 0

The effect of weathering on the variation of geotechnical properties of a granitic rock from Chile 风化作用对智利花岗岩岩土力学性质变化的影响

IF 1.4 4区工程技术

Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-09-08 DOI: 10.1144/qjegh2023-022

Nicol E. Flandes, Felipe A. Villalobos, Robert King

{"title":"The effect of weathering on the variation of geotechnical properties of a granitic rock from Chile","authors":"Nicol E. Flandes, Felipe A. Villalobos, Robert King","doi":"10.1144/qjegh2023-022","DOIUrl":"https://doi.org/10.1144/qjegh2023-022","url":null,"abstract":"The effect of rock weathering on geotechnical parameters can become substantial in geotechnical design. The weathering degree WD has been normally divided in five levels from fresh rock to completely weathered rock. In this study, the above five WDs are adopted to analyse the variation of several regularly used geotechnical properties. To that aim, a series of laboratory tests to a Chilean granitic rock in different stages of weathering was carried out. The results of the tests have been analysed by normalising each geotechnical parameter respect to the value obtained for slightly weathered samples instead of the fresh rock samples, which is usually adopted. In this way, it was found that the results of unconfined compressive strength UCS reduces steadily and considerably with each WD, which has been previously reported. Conversely, the modulus of deformation and P-wave velocity tend to stabilise the rate of reduction for highly and completely weathered rock samples, which does not agree with the trend and higher rate reductions found by other authors. This stabilisation reduction rate with WD was also found for compaction density, friction angle and Poisson's ratio.","PeriodicalId":20937,"journal":{"name":"Quarterly Journal of Engineering Geology and Hydrogeology","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43086261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Engineering properties of tropical transported soils: case study from the Republic of the Congo 热带运输土壤的工程特性：以刚果共和国为例

IF 1.4 4区工程技术

Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-08-23 DOI: 10.1144/qjegh2021-134

G. Brink, M. Brook

{"title":"Engineering properties of tropical transported soils: case study from the Republic of the Congo","authors":"G. Brink, M. Brook","doi":"10.1144/qjegh2021-134","DOIUrl":"https://doi.org/10.1144/qjegh2021-134","url":null,"abstract":"Tropical residual soils are often reported to exhibit highly variable geotechnical characteristics, due to formation by rock weathering under hot, humid conditions. Less is known about the engineering properties of tropical reworked (i.e. transported) soils. The latter soil type is also encountered in tropical regions, but can exhibit sorting and include weak structures formed during transport and deposition, causing instability when exposed in road/rail cuttings. We report a case study of geochemical and engineering properties of tropical reworked soils from the slopes of Mt Lekoumou (Republic of the Congo), a Banded Iron Formation (BIF) ridgeline overlain by loose, unconsolidated clayey gravel. Aside from the upper-most slopes, the area is overlain by colluvium of varying thickness, the target of testing, here. Goethite, kaolinite and hematite are dominant minerals, and the colluvium displays moderately high liquid limits, but comparatively low plasticity index values. Effective cohesion (c') values were 0 and 31 kPa and effective friction angles (ϕ') were 26°-39°. Considerable variation in matric suction pressures for the same sample sites, at the same moisture contents, occurs. Thus, as with tropical residual soils, determining test values that are ‘representative’ of site conditions in tropical transported soils can be problematic, but remains important.","PeriodicalId":20937,"journal":{"name":"Quarterly Journal of Engineering Geology and Hydrogeology","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43037672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Well performance in relation to design, construction and wellfield operation: a case study from the fossil Ram sandstone aquifer in Southern Jordan 油井性能与设计、施工和井场作业的关系：以约旦南部拉姆砂岩化石含水层为例

IF 1.4 4区工程技术

Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-08-21 DOI: 10.1144/qjegh2023-039

A. Charalambous, B.R. Burnet

{"title":"Well performance in relation to design, construction and wellfield operation: a case study from the fossil Ram sandstone aquifer in Southern Jordan","authors":"A. Charalambous, B.R. Burnet","doi":"10.1144/qjegh2023-039","DOIUrl":"https://doi.org/10.1144/qjegh2023-039","url":null,"abstract":"\u0000 The Dubaydib wellfield in Southern Jordan comprises 55 wells up to 600 m in depth, and exploits the fossil Ram sandstone aquifer. It has an average output of 100 MCM a\u0000 -1\u0000 and well yields of 51 - 80 l s\u0000 -1\u0000 . Drilling fluid has affected well performance with lowest specific capacities of 1.56 l s\u0000 -1\u0000 m\u0000 -1\u0000 in bentonite drilled wells, highest ( 5.46 l s\u0000 -1\u0000 m\u0000 -1\u0000 ) in water drilled open hole constructions and in the middle range ( 3.07 l s\u0000 -1\u0000 m\u0000 -1\u0000 ) in polymer drilled wells. Well loss coefficients and skin effect values confirm these results. The productivity of bentonite drilled wells has not improved during production indicating that the damage has been irreversible. Well efficiency evaluations have been found to be sensitive to the method of calculation and not to provide a reliable measure of productivity. During the course of wellfield operation (2013-2021) specific capacities declined from an all well average of 3.78 to 3.13 l s\u0000 -1\u0000 m\u0000 -1\u0000 or c.17 %. The decline reflects the deepening of groundwater levels as a result of aquifer response rather than well deterioration. As groundwater extraction is from storage, specific capacities will continue to fall, tentative estimates suggesting to 2.56 l s\u0000 -1\u0000 m\u0000 -1 \u0000 after 25 years and 2.16 l s\u0000 -1\u0000 m\u0000 -1\u0000 after 50 years.\u0000","PeriodicalId":20937,"journal":{"name":"Quarterly Journal of Engineering Geology and Hydrogeology","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45631160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0