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Experimental study on shear properties and resistivity change of soil-rock mixture

Journal of Mountain Science 2024年第11期21卷 3930-3944页

作者： LIU Gang WANG Kui XIA Zhengting Engineering Research Centre of Diagnosis Technology of Hydro-Construction Chongqing Jiaotong UniversityChongqing 400074China Institute of Engineering Design&Research Chongqing Jiaotong University Chongqing 400074China

The deterioration of shear resistance in rock and soil masses has resulted in numerous severe natural disasters,highlighting the significance of long-term monitoring for disaster prevention and *** study explores the use of a non-destructive method to quickly and accurately evaluate the shear properties of soil-rock *** shear stress,shear strain,and resistivity of the soil-rock mixture were tested simultaneously using a combination of direct shear and resistivity *** test results show that the resistivity of the soil-rock mixture gradually decreases with increasing shear *** resistivity of all specimens ranged approximately from 60 to 130Ω.m throughout the shear *** the end of the shear test,the vertical failure resistivity showed an irregular“W”shape with increasing rock *** exhibited a significant negative linear functional relationship with the shear *** reference to the determination of cohesion and internal friction angle on the shear strength envelope,the horizontal angle of the vertical failure resistivity-normal stress curve is defined as the resistivity angle,and the intercept of the curve is the resistivity at the initial moment of *** has been observed that the resistivity angle is negatively and linearly correlated with the internal friction *** the same time,there is a linear growth relationship between resistivity at the initial moment of shear and *** has been demonstrated that an increase in rock content contributes to a general escalation in both the average structure factor and average shape ***,a decrease in the anisotropy coefficient has also been *** alterations are indicative of the extent of microstructural transformations occurring during the deformation process of the soil-rock *** research results verify the feasibility of real-time deformation monitoring and characterization of shear strength parameters using resistivity.

关键词： Soil-rock mixture shear properties Resistivity change Structural characteristic parameters Deformation monitoring

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Biochar-Induced Changes in Soil Resilience:Effects of Soil Texture and Biochar Dosage

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Pedosphere 2017年第2期27卷 236-247页

作者： Ayodele Ebenezer AJAYI Rainer HORN Department of Agricultural and Environmental Engineering Federal University of Technology 340252 Akure Ondo State (Nigeria) Institute for Plant Nutrition and Soil Science CAU Kiel 24118 Kiel (Germany)

Biochars are, amongst other available amendment materials, considered as an attractive tool in agriculture for carbon sequestration and improvement of soil functions. The latter is widely discussed as a consequence of improved physical quality of the amended ***, the mechanisms for this improvement are still poorly understood. This study investigated the effect of woodchip biochar amendment on micro-structural development, micro-and macro-structural stability, and resilience of two differently textured soils,fine sand(FS) and sandy loam(SL). Test substrates were prepared by adding 50 or 100 g kg^(-1) biochar to FS or SL. Total porosity and plant available water were significantly increased in both soils. Moreover, compressive strength of the aggregates was significantly decreased when biochar amount was doubled. Mechanical resilience of the aggregates at both micro-and macro-scale was improved in the biochar-amended soils, impacting the cohesion and compressive behavior. A combination of these effects will result in an improved pore structure and aeration. Consequently, the physicochemical environment for plants and microbes is improved. Furthermore, the improved stability properties will result in better capacity of the biochar-amended soil to recover from the myriad of mechanical stresses imposed under arable systems, including vehicle traffic, to the weight of overburden soil. However, it was noted that doubling the amendment rate did not in any case offer any remarkable additional improvement in these properties, suggesting a further need to investigate the optimal amendment rate.

关键词： aggregate stability amendment material compressive strength rheometry shear properties total porosity

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