Strongly weathered tuff density

Key parameters of volcanic tuffs used as building stone: a

2021年12月8日  Volcanic tuffs naturally show a strong heterogeneity in their petrography and petrophysical properties The arrangement of the components in tuffs can create a very wide spectrum of porosities and fabrics, which in turn can lead to a highly differential weathering Metrics2023年3月10日  Crystals are strongly weathered and the glassy matrix strongly altered to zeolites and clay minerals Approximately 7% of the crystals are matrix supported The strong Moisture expansion of tuff stones and sandstones2019年6月26日  Tuff rock has geotechnical properties such as 1825 kN/m 3 of unit weight, 15 24 gr/cm 3 of bulk density, 229 264 gr/cm 3 of particle density, highly varied compressive Tuff as rock and soil: Review of the literature on tuff

Pore property as an indicator of macrodeterioration in

2020年3月20日  Pore properties changes indicate macrodeterioration of tuff during weathering Tuff rock is highly heterogeneous due to volcanic activity, hydrothermal alteration, and 2024年3月15日  The entrances and exits of the left and right line tunnels are all situated on the slope of the hill, surrounded by 3–5 m thick, strongly weathered tuffExcavation method optimization and mechanical responses 2012年12月28日  To provide a deeper understanding of the processes, swelling and deterioration were performed on 14 volcanic tuffs used as important building stones of different ages, compositions and weathering stages from Mexico, Weathering of volcanic tuff rocks caused by 2019年11月28日  The results demonstrated that additional mesopore (10–50 nm) increases with pore throat expansion during weathering, and the change of pore structure influences the tuff Variability of technical properties and durability in volcanic

Estimation of engineering properties of selected tuffs by

2016年8月1日  In this study the authors aim to determine how the petrographic properties of tuffs that exhibit varying colours and textural properties change, and the effect of these 2020年1月1日  This paper covers reconstruction of standard specimen with measurements of tuff dry density, natural water content and particle grading curve; analysis of axial stress and strain Experimental Study on Mechanical Property of Highly Weathered Tuff 2021年11月1日  On the contrary, subjectively speaking, if the tunnel locates entirely in strongly weathered tuff, the constructors may emphasize these risks but in the cross zone these risks are generally ignored Moreover, groundwater is usually an unfavourable factor for geotechnical engineering Moderately weathered tuff Weak weathering tuff; Density Investigation of a large ground collapse, water inrush and 2020年6月27日  The Quaternary overburden is composed of miscellaneous fill and silty clay, with thickness ranging from several meters in the northwest to ~ 25 m in the southeast The bedrock is mainly composed of strongly–moderately weathered tuff and breccia a Geologic section AA' illustrates the active fault F1Active faults and bedrock detection with superhighdensity

(PDF) Moisture expansion of tuff stones and sandstones

2023年3月10日  Characteristic thin section fabrics and microstructures of the selected Mexican tuffs A Cryptocrystalline matrix in the Blanca Pachuca tuff with quartz phenocrysts, weathered feldspar crystals 2022年9月5日  Download Citation Structural design and mechanical responses of closely spaced superspan double tunnels in strongly weathered tuff strata This paper presents a study of closely spaced double Structural design and mechanical responses of closelytunnel and the existing tunnel are moderately weathered tuff and strongly weathered tuff, respectively Both the new tunnel and the existing tunnel are single bore tunnels with double tracks, and the tunnel section is 118 m high and 140 Dynamic response characteristics of crossing tunnels 2023年8月30日  The upper strongly weathered tuff has a thickness of 3–13 m and is characterized by developed cracks, while the lower part is weakly weathered with high integrity and strength Given that the study area has high population density and developed economies and is a disasterprone region struck by typhoons, deepseated landslides are likely Insights into initiation of typhooninduced deepseated

Moisture expansion of tuff stones and sandstones

2023年3月10日  A Cryptocrystalline matrix in the Blanca Pachuca tuff with quartz phenocrysts, weathered feldspar crystals and rounded Crystals are strongly weathered and the glassy matrix strongly altered to zeolites and clay minerals Such a ‘smectitic character’ is caused by an intermediate layer charge density of the 2:1 structural units 2019年6月26日  Tuff rock has geotechnical properties such as 1825 kN/m³ of unit weight, 15 24 gr/cm³ of bulk density, 229 264 gr/cm³ of particle density, highly varied compressive strength depending Tuff as rock and soil: Review of the literature on tuff 2023年11月1日  Strongly weathered tuff: Grayish yellow; most of the rock structure is destroyed, the mineral composition has been drastically altered, there is high residual strength, weathering fracture development, and ferromanganese is visible on the fracture surface; The core of the rock is typically fragmented and produces a dull pounding sound when Field experimental study on the pullout characteristics of a 2024年2月18日  Influenced by the F1 fault, the upper plate of the fault is composed of strongly weathered tuff characterized by extremely fractured rock quality, extensive fractures, highly weathered fracture surfaces, and localized mud deposition Density (kg/m 3) Young’s Modulus (MPa) Prestressing Force (kN) Anchor bolt: 80424 × 10 −4: 7850: 2 × Stability Analysis of a Rocky Slope with a Weak Interbedded

Probabilistic assessment of seismic stability of a rock slope

2019年10月3日  The original slope is composed mainly of silty clay, strongly weathered tuff, moderately weathered tuff, and relativelyintact bedrock Geological surveys have indicated that groundwater is buried deep under the surface, so the effects of groundwater were not considered in this case Then, the cumulative distribution and probability density 2020年7月6日  The Niushou landslide is a slowmoving landslide in the Niushou Mountain cultural tourism area, Nanjing City, Jiangsu Province of China In June 2015, a tension crack appeared on the south side of Niushou Mountain due to the continuous rainfall, which brought great potential safety risk to the scenic area and the construction of the Alila Hotel From July The Niushou landslide in Nanjing City, Jiangsu Province of 2021年2月9日  weathered tuff breccia has the lowest soil hardness Fig 7 Condition of Yabakei landslide (Photos taken on July 2018) nonplastic soil with a low density of soil particles, void ratio, and Characteristics of tuff brecciaandesite in diverse 2022年8月26日  Many cultural heritage sites in Mexico have been built with volcanic tuff rocks from the earliest Central American civilizations to the time of the Spanish conquest and up to the present Throughout this long period of time, the stones have been subjected to progressive weathering as evidenced by different types of damage phenomenon such as scaling, sanding, Overview and quality assessment of volcanic tuffs in the

Excavation method optimization and mechanical responses

2024年3月15日  He, J et al Investigating the mechanical responses and construction optimization for shallow superlarge span tunnels in weathered tuff stratum based on field monitoring and Flac3D modeling Int J2018年5月1日  In this study, a series of largescale directshear tests was conducted to investigate the mechanical behaviors of SRMs composed of weathered basalt with different rock block contents, including (PDF) Mechanical Properties of Strongly Weathered 2021年7月17日  The slope is entirely covered by silty clay and fully to strongly weathered tuff The annual rainfall in this area is 2000 mm and mainly occurs in summer The groundwater is bedrock fissure water supplied by atmospheric precipitation The shear strength and density of the rock and soil mass in the saturation zone decreases and increases Study of the slope deformation characteristics and landslide mechanisms 2020年11月12日  The major triggering factor of the collapses, landslides, and debris flow in the northwest region of Zhejiang Province in China is the shallow loose covering stratum with a thickness of dozens of Integrated system of geophysical methods for shallow loose

Investigating the Mechanical Responses and

2024年2月23日  inside is weathered tuff The tuff stratum at the entrance of the tunnel has been strongly weathered, and the rock joints are extremely developed The diameter of the rock blocks is about 2cm to 30cm, and clay layers with thicknesses of 1cm to 5cm are formed in local areas Along the tunnel entrance, the weathering degree of the surrounding rock2023年3月24日  The slope is mainly composed of four soil layers in natural state, ie, boulder with cohesive soil, silty clay, completely weathered tuff, and strongly weathered tuffEvolution process and failure mechanism of a large Therefore, pores are a firstorder factor controlling erosion and mass movement processes In the profile studied, the bulk density decreases from an average 237 g/cm 3 in the fresh wehrlite to 1 (a) Bulk density, (b) grain density, and (c) 2021年12月3日  impossible to define the distribution density and spacing of the joint surface according to the actual situation, and only equivalent treatment can be done Literature [11] proposed a method of "bricktype" weathered tuff lava, (4) strongly weathered tuff lava, (5) weakly weathered tuff lava In this paper, the upper slope of highway is Research on Dynamic Response of Anchored Jointed

Prediction of ultimate bearing capacity of rocksocketed

2024年3月1日  ②Strongly weathered tuff: 15: 2100: 60: 025: 30: 50: ③Mid Weathered tuff: Not debunked: 2400: 1500: 023: 42: 125: rock elastic modulus, pile elastic modulus, rock Poisson's ratio, soil density, soil thickness, rocksocketed depth, rock friction coefficient, and rock cohesion are found to have a significant impact on the vertical 2019年12月23日  Density of Highly Weathered Soils in Central Africa Soil Physics Bulk density (BD) is a key soil property for sustainable land management and c stock assessment However, data on BD are often missing in various soil (DCBAl) as predictors of the BD of strongly weathered soils For the Democratic Republic of the Congo (DR Congo)Hierarchical Pedotransfer Functions to Predict Bulk 2023年9月13日  Strongly weathered tuff Weakly weathered tuff Sliding surface 155° Shanzao Road Shanzao River 260 220 240 180 El 200 ev at ion(m) Fig 2 Longitudinal prole of the Yongjia landslide (A–A′ section in Fig 1, provided by the China Geological Survey)Insights into initiation of typhooninduced deepseated 2019年11月28日  The results demonstrated that additional mesopore (10–50 nm) increases with pore throat expansion during weathering, and the change of pore structure influences the tuff failure mode Specifically, for the slightly weathered tuff, crack initiates in the altered minerals or matrix and results in shear failureVariability of technical properties and durability in volcanic

Mechanical Properties and DryWet Cycle Effects of

2020年2月21日  Strongly weathered mudstone is a clastic sedimentary rock stratum with continental sedimentation as the main causewhich is generally formed by collision and folding of sandston, e density between the particles increasesand the macroscopic performance of 2024年8月15日  Strongly weathered tuff: 14 They change with the temperature, moisture content, and density of the frozen soil itself, and the position of the pilesoil interface is also not fixed Therefore, the heat transfer between the two sections is nonlinear, and it is not possible to obtain a specific analytical solution in mathematics Analysis on the cooperative variation law of pilesoil 2018年8月1日  density (Mg m − 3), w is the soil weight, a, b, and c are the fitting parameters, and ρ b * and S p are the normalized bulk density and water content, respectively bon (Lobsey and Viscarra (PDF) Soil Bulk Density Estimation Methods: A Review2020年3月20日  Metamorphism, tectonic processes, and hydrothermal alteration prior to weathering can strongly influence the mineralogy and fabric properties of tuff rocks, although chemical weathering processes dominate the development of their weathering profiles (Irfan, 1999; Pola et al, 2012)Intense hydrothermal alteration can lead to rock fabric decomposition Pore property as an indicator of macrodeterioration in

Investigation of a large ground collapse, water inrush and

2021年11月1日  On the contrary, subjectively speaking, if the tunnel locates entirely in strongly weathered tuff, the constructors may emphasize these risks but in the cross zone these risks are generally ignored Moreover, groundwater is usually an unfavourable factor for geotechnical engineering Moderately weathered tuff Weak weathering tuff; Density 2020年6月27日  The Quaternary overburden is composed of miscellaneous fill and silty clay, with thickness ranging from several meters in the northwest to ~ 25 m in the southeast The bedrock is mainly composed of strongly–moderately weathered tuff and breccia a Geologic section AA' illustrates the active fault F1Active faults and bedrock detection with superhighdensity 2023年3月10日  Characteristic thin section fabrics and microstructures of the selected Mexican tuffs A Cryptocrystalline matrix in the Blanca Pachuca tuff with quartz phenocrysts, weathered feldspar crystals (PDF) Moisture expansion of tuff stones and sandstones2022年9月5日  Download Citation Structural design and mechanical responses of closely spaced superspan double tunnels in strongly weathered tuff strata This paper presents a study of closely spaced double Structural design and mechanical responses of closely

Dynamic response characteristics of crossing tunnels

tunnel and the existing tunnel are moderately weathered tuff and strongly weathered tuff, respectively Both the new tunnel and the existing tunnel are single bore tunnels with double tracks, and the tunnel section is 118 m high and 140 2023年8月30日  The upper strongly weathered tuff has a thickness of 3–13 m and is characterized by developed cracks, while the lower part is weakly weathered with high integrity and strength Given that the study area has high population density and developed economies and is a disasterprone region struck by typhoons, deepseated landslides are likely Insights into initiation of typhooninduced deepseated 2023年3月10日  A Cryptocrystalline matrix in the Blanca Pachuca tuff with quartz phenocrysts, weathered feldspar crystals and rounded Crystals are strongly weathered and the glassy matrix strongly altered to zeolites and clay minerals Such a ‘smectitic character’ is caused by an intermediate layer charge density of the 2:1 structural units Moisture expansion of tuff stones and sandstones2019年6月26日  Tuff rock has geotechnical properties such as 1825 kN/m³ of unit weight, 15 24 gr/cm³ of bulk density, 229 264 gr/cm³ of particle density, highly varied compressive strength depending Tuff as rock and soil: Review of the literature on tuff

Field experimental study on the pullout characteristics of a

2023年11月1日  Strongly weathered tuff: Grayish yellow; most of the rock structure is destroyed, the mineral composition has been drastically altered, there is high residual strength, weathering fracture development, and ferromanganese is visible on the fracture surface; The core of the rock is typically fragmented and produces a dull pounding sound when 2024年2月18日  Influenced by the F1 fault, the upper plate of the fault is composed of strongly weathered tuff characterized by extremely fractured rock quality, extensive fractures, highly weathered fracture surfaces, and localized mud deposition Density (kg/m 3) Young’s Modulus (MPa) Prestressing Force (kN) Anchor bolt: 80424 × 10 −4: 7850: 2 × Stability Analysis of a Rocky Slope with a Weak Interbedded

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