peng run soil large diameter penghancur

TECHNIQUES FOR SIMULATION OF LARGE-SCALE …

2011-11-25 · mild infinite slopes. Single piles of 0.10 to 0.32 m in diameter as well as 2x2 pile groups were tested in soil layers of up to 5.5 m depth with and without an upper non-liquefiable crust (He 2005). Figures 1 & 2 depict the large and medium size laminar soil boxes (Kagawa et al. 2004; He 2005), respectively, employed in these recent experiments.

Run LIU | Tianjin University, Tianjin | tju | School of ...

Large diameter d (2.134 m), deep penetration 1(96 m), small spacing s(a) (3.507 m), and only one row piles are the usual characteristics of the pile group foundation in offshore engineering.

Coexistence patterns of soil methanogens are closely tied ...

2021-1-22 · Soil methanogens participate in complex interactions, which determine the community structures and functions. Studies continue to seek the coexistence patterns of soil methanogens, influencing factors and the contribution to methane (CH4) production, which are regulated primarily by species interactions, and the functional significance of these interactions.

Polycyclic aromatic hydrocarbons in urban soils of China ...

2019-11-1 · Polycyclic aromatic hydrocarbons (PAHs) in urban soils are a risk to the health of residents. To predict those risks, the distribution and the factors influencing the concentration of PAHs were studied by collecting 1120 records of soil PAHs published during 2006–2017 from 26 cities.

HESS

2021-3-31 · Abstract. Pedotransfer functions are used to relate gridded databases of soil texture information to the soil hydraulic and thermal parameters of land surface models. The parameters within these pedotransfer functions are uncertain and calibrated through analyses of point soil samples. How these calibrations relate to the soil …

Quantifying Soil Phosphorus Dynamics: A Data Assimilation ...

2019-7-2 · In general, small soil P pools (e.g., primary mineral P in highly weathered soils and labile P) have larger measurement errors than large soil P pools (e.g., primary mineral P in lightly weathered soils and occluded P), due to their ease of loss and/or being contaminated by the previous extract during fractionation (Condron & Newman, 2011 ...

ESSD

Soil moisture plays a crucial role in a range of biogeophysical and biogeochemical land surface processes (Moene and van Dam, 2014; Seneviratne et al., 2010). These processes include the transport of energy and matter via evapotranspiration, drainage, run-off, infiltration and plant photosynthesis, and controlling aerobicity of soils.

-《》

2014-5-25 · LI Z B,ZHANG S B. Pipeline maintenance and repair methods in frozen soil[J]. Oil & Gas Storage and Transportation, 2013, 32 (10):1138-1140. [9],,. [J]., 2011, 30 (12):881-883.

Effects of microplastics and earthworm burrows on soil ...

2020-8-12 · 1 INTRODUCTION. Soil, a porous media, can be considered as a natural filter for many solutes and contaminants (Keesstra et al., 2012).Water and solutes infiltrating from the soil surface into the subsoil can be classified as equilibrium or nonequilibrium flow (Hendrickx & Flury, 2001).When water flows with a stable wetting front that is parallel to the soil surface, it is classified as ...

Research on the Slurry for Long-Distance Large-Diameter ...

2018-10-14 · In addition, large amount of slurry will be required for a long-distance large-diameter pipe jacking project; this will lead to high cost when using oil base slurry. In this paper, the key design points of pipe jacking slurry for pipe jacking in expansive soil were put forward by reference to the study on water-based drilling mud and the ...

Compost applications increase bacterial community ...

2021-3-24 · Trees were planted in 38 L (33 cm in diameter × 36 cm in height) pots containing Poplimento silt loam orchard soil, a fine, mixed, subactive, mesic Ultic Hapludalf (Soil Survey Staff, 2014), mixed with 10% (v/v) STALITE to improve drainage and aeration. Soil pH, CEC, OM, and Mehlich-I-extractible mineral nutrients were uniform across all pots ...

Axial pipe-soil interaction during pipeline-walking ...

A set of large-scale model tests are conducted on the axial soil resistances of pipelines placed on Bohai sand. Based on the test results and the influence mechanisms of the pipe-soil interactions on pipeline walking, a bi-linear pipe-soil interaction model for pipelines placed on sandy soils is proposed.

Rock and Soil Mechanics

2021-8-18 · Rock and Soil Mechanics(Monthly) is an academic journal about rock & soil mechanics and geotechnical engineering, started in 1979. It is sponsored by Wuhan Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Its ISSN is 1000-7598. Rock and Soil Mechanics is edited and published by Science Press.

Rapid and quantitative detection of Fusarium oxysporum f ...

2014-9-9 · Fifteen to twenty soil samples were randomly taken under the infected banana root by shovelling soil below the ground surface adjacent to the root system. All the soil subsamples were taken within 100 mm depth and 10 mm in diameter (Ophel-Keller et al. 2008). Samples were transported to a storage room and stored for a maximum of 2 weeks at room ...

An improved method for the segmentation of roots from X ...

2021-4-8 · X-ray computed tomography is acknowledged as a powerful tool for the study of root system architecture of plants growing in soil. In this paper, we improved the original root segmentation algorithm "Rootine" and present its succeeding version "Rootine v.2". In addition to gray value information, Rootine algorithms are based on shape detection of cylindrical roots.

,2018,14 (01):241-249. (Li Li, Deng Yahong, Wang Peng, Mu Huandong, Li Feixia. Study on the Relationship Between the Shear Strength and the Long-term Rheological Strength of the Q3 Loess in the Fissure Zone [J].

Plant-microbe-soil interactions in the rhizosphere: an ...

2009-6-20 · Soils are the product of the activities of plants, which supply organic matter and play a pivotal role in weathering rocks and minerals. Many plant species have a distinct ecological amplitude that shows restriction to specific soil types. In the numerous interactions between plants and soil, microorganisms also play a key role. Here we review the existing literature on interactions between ...

Effects of microplastics and earthworm burrows on soil ...

2020-8-12 · The macropore network parameters (i.e., number, length, volume, diameter, soil saturated conductivity, and tracer breakthrough curves of soil columns) have been determined. The relative arrival times of the tracer mass (i.e. T5%, T25%, and T50%) were determined in order to describe the shapes of the breakthrough curves.

Physical and chemical characterization of biochars derived ...

2020-7-25 · physicochemical properties of biochar as a soil amendment. Low-temperature pyrolysis produced high biochar yields; in contrast, high-temperature pyrolysis led to biochars with a high C content, large surface area, and high adsorption char-acteristics. Biochar …

Research on the Slurry for Long-Distance Large-Diameter ...

2014-8-8 · Considering the viscous damping of the soil and soil-pile vertical coupled vibration, a computational model of large-diameter pipe pile in layered soil was established. The analytical solution in frequency domain was derived by Laplace transformation method. The responses in time domain were obtained by inverse Fourier transformation. The results of the analytical solution proposed agree well ...

Physics-Based Deformable Tire–Soil Interaction Model for ...

A physics-based deformable tire–soil interaction simulation capability that can be fully integrated into the monolithic multibody dynamics computer algorithm is developed by extending a deformable tire model based on the flexible multibody dynamics approach to off-road mobility simulations with a moving soil patch technique and it is validated against test data.

Upper-Bound Analysis of Maximal Lateral Resistance for ...

The pipe-soil interaction plays a critical role in the thermal buckling of a pipeline. In this study, a pipe segment with a 16-cm outer diameter and 1-m length is considered the object. Pipe-soil interaction model tests of lateral movement under different pipe segment weights within the scope of 0.05 to 0.65 kN / m are implemented in sand. The ...

Research on the Slurry for Long-Distance Large-Diameter ...

2018-10-14 · Research on the Slurry for Long-Distance Large-Diameter Pipe Jacking in Expansive Soil. ... had run for 5 minutes, the ammeter reading was recorded to ... long-distance large-diameter …

SOIL

Abstract. Zinc (Zn) deficiency is a widespread nutritional problem in human populations, especially in sub-Saharan Africa (SSA). The Zn concentration of crops consumed depends in part on the Zn status of the soil. Improved understanding of factors controlling the phyto-availability of Zn in soils can contribute to potential agronomic interventions to tackle Zn deficiency, but many soil types ...

Changes in microstructural behaviour and hydraulic ...

2016-1-1 · Structural changes (meso-scale) in soils have been described as a consequence of mechanical and/or hydraulic stresses (Peng et al., 2007, Horn et al., 2012), whereas microstructural (micro-scale) development is well related to bio-chemical changes in the soil (Holthusen et al., 2010, Peng et al., 2011, Markgraf et al., 2012, Baumgarten et al ...

Soil organic carbon sequestration in upland soils of ...

2014-3-3 · 1 Introduction. Soil organic carbon (SOC) sequestration in agricultural soil is directly affected by anthropogenic activities and climate change; both can alter net primary production (NPP) and organic matter decomposition [Yan et al., 2010].Carbon inputs to soil …

Calculation of Silo Wall Pressure considering the ...

The reasonable determination of wall pressure is critical for the design of silo structures. In this study, the primary objective is to present four novel wall pressure coefficients based on four true triaxial strength criteria in the quasiplane strain state. These four strength criteria are the Drucker-Prager (D-P) criterion, the Matsuoka-Nakai (M-N) criterion, the Lade-Duncan (L-D) criterion ...

Soil bacterial populations are shaped by recombination and ...

2020-4-23 · Previously, 60 soil samples were collected at depths of 10–20, 20–30, and 30–40 cm near the respective centers of six 10 m diameter plots, spaced 5 m apart.

The internal erosion process and effects of undisturbed ...

2020-8-20 · Internal erosion is a complex phenomenon that is one of the main risk factors to soil destruction. Its occurrence is mainly due to water infiltration and can cause slope instability. "Karst soil" is a type of loess with special soil and water sensitivity that makes it prone to landsliding. The processes of internal erosion include transport erosion and chemical dissolution, which strongly ...

Large influence of dust on the Precambrian climate ...

2020-9-4 · The soil erodibility (k) represents the efficiency of soil in producing dust aerosols under a given wind stress 26,50. It is usually prescribed in an erodibility map 51, 52 .

Microplastics in the aquatic and terrestrial environment ...

2016-1-6 · Microplastics may remain in the soil, be mobilised and distributed by wind, or be transported with surface run-off to the aquatic environment [31, 77, 94, 95]. When sewage sludge is disposed into oceans, microplastics directly reach the aquatic environment. In most industrialised countries, ocean disposal of sewage sludge is prohibited.

China Journal of Highway and Transport

Design and Experimental Research on Novel Large Diameter GFRP Tendon Anchorage HOU Su-wei, ZHOU Tai-xiang, LONG Pei-heng DOI: 10.19721/j.cnki.1001-7372.2021.07.021

Effects of understory removal and tree girdling on soil ...

2011-3-7 · The changes in soil microbial community caused by understory removal were mainly attributed to the indirect effects such as increased soil temperature and soil NO 3 −-N availability. In addition, PRC analysis showed that the relative abundance of most PLFAs increased in response to understory …

(PDF) Pipe-Soil Interaction Behaviour during Lateral Buckling

2006-9-1 · This paper addresses lateral pipe/soil interaction behavior at the large displacements that occur with lateral buckling of a pipeline. Force-displacement-response models were developed by the ...