The Mechanics of Frost Heave with Stratigraphic Microstructure Evolution: A New Fractal Model for Investigating the Micro-Macro Behaviors of Geotechnical Engineering in Cold Regions

Ye, Dayu; Liu, Guannan; Ma, Tianran; Cheng, Gaojie; Fan, Shudi; Yang, Tingting

doi:10.2139/ssrn.4269894

Cited by 3 publications

(3 citation statements)

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“…Pore fissure in the coal body is an essential factor that causes the change in longitudinal wave velocity. As a porous material, the closing and generation of fissure in coal and rock is closely related to the stress-strain stage under load (Wang et al, 2023;Xu et al, 2023;Ye et al, 2023). The stress-strain curve of the general coal body loading process can be divided into five sections, and the stress-strain characteristics and wave velocity change characteristics at each stage are shown in Fig.…”

Section: Analysis Of Technical Application Methodsmentioning

confidence: 99%

Response law and indicator selection of seismic wave velocity for coal seam outburst risk

Qiu,

Zhu,

Liu

et al. 2023

Adv. Geo-Energy Res.

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The accurate detection of coal seam stress field effectively prevents coal and gas outbursts. This study uses wave velocity, wave velocity anomaly coefficient, and wave velocity gradient as indicators to identify stress anomalies in coal seam. The results show that these three indicators of wave velocity are all positively correlated with load, while changes in the wave velocity anomaly coefficient and wave velocity gradient are more gentle than those of wave velocity. The degree of damage of coal can be judged by the wave velocity anomaly coefficient, while the transition between high and low stress zones can be identified by the wave velocity gradient. In areas affected by geological structures such as valleys and mountain tops, the coal seam wave velocity and wave velocity anomaly coefficient may exhibit anomalies. The comparative analysis of wave velocity and its derived indicators can reveal the stress state and coal structure of coal seamwith higher accuracy, identify the areas affected by geological structures such as valleys and mountain tops, and determine the boundary of the stress relief zone after hydraulic fracturing. Combined with the actual geological structure characteristics of coal seam, it can accurately identify the stress disturbance region of coal seam and achieve the purpose of predicting coal and gas outbursts.

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Section: Analysis Of Technical Application Methodsmentioning

confidence: 99%

Response law and indicator selection of seismic wave velocity for coal seam outburst risk

Qiu,

Zhu,

Liu

et al. 2023

Adv. Geo-Energy Res.

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“…Deep coal seams are characterized by high gas pressure, high geothermal temperature, high ground stress, strong disturbance, strong time-effect, and low permeability [1,2] , which cause inconveniences in drilling operations and gas extraction processes. Among these, borehole collapse is a common issue, leading to the blockage of gas extraction channels, thereby affecting the utilization rate of boreholes, the service cycle of extraction, and the total amount of gas extracted [3,4] . Currently, a commonly used method is to employ screen pipes for immediate protection of boreholes to prevent collapse [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Development and application of high-performance drilling hole protection materials

Zhang,

Wang,

Gao

et al. 2024

Preprint

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The instability and collapse of the extraction borehole seriously affects the gas extraction effect, and it is of great significance to study the efficient borehole protection technology to improve the stability of the borehole and ensure the gas extraction effect. The purpose of this paper is to develop an environmentally friendly borehole protection material with high strength, high permeability and controllable setting time, and then propose a borehole synergistic protection technology for in-hole screen protection and grouting reinforcement. The foaming agent mother liquor was obtained by hydrolysis of human slag, the composite protein foaming agent was prepared by improving the compounding of the mother liquor, pulverized coal was used instead of fly ash as mineral admixture, the water-cement ratio, material ratio and foaming agent addition amount of the optimal grouting material were determined by orthogonal tests, and the foam concrete with high strength and high permeability was prepared, and its on-site construction feasibility was verified by the dynamic curing characteristics experiment of coagulation time and fluidity. Finally, the borehole synergistic protection technology of in-hole screen protection and grouting reinforcement was proposed, and industrial tests were carried out in the field. The results showed that: 1) Sodium hydroxide hydrolyzed human hair residue was used as a composite protein foaming agent mother liquor material, and the optimal foam performance was determined to be 2g/L sodium laureth sulfate (SLS) + 0.3% calcium stearate through the compound improvement experiment. 2) Pulverized coal replaces the commonly used material fly ash as concrete admixture, which can effectively use waste resources, improve the strength and durability of concrete, and reduce carbon emissions and environmental pollution. 3) The prepared hole protection material has high permeability and compressive strength, when the water-cement ratio is 0.7:1, the foam content is 25ml, the pulverized coal is 30g, the silica fume is 5g, and the polypropylene is 0.2g, the compressive strength of the material is 13.665MPa, the permeability is 2.12MD, the porosity is 22.019%, and the coagulation time is 401 minutes to 418 minutes, which meets the requirements of initial solidification within 1–3 days. The fluidity is 320mm, which is in line with the field experiment. 4) The proposed screen pipe and grouting borehole collaborative protection technology can realize the internal and external coordinated protection of the borehole, the grouting outer layer protection can be poured and solidified according to the shape of the borehole and the falling coal and rock, the inner layer protection of the screen pipe can enhance the stability of the borehole and the grouting material after solidification, effectively prevent the instability and collapse of the borehole wall, ensure the smooth borehole extraction channel, and effectively improve the gas extraction efficiency.

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“…Deep coal seams typically exhibit the "three high, two strong, and one low" characteristics, namely high gas pressure, high geothermal temperature, high geostress, strong disturbance, strong time-effect, and low permeability. During drilling and extraction, the collapse of the borehole wall is a common occurrence [1][2], leading to the blockage of gas extraction channels and affecting the drilling utilization rate, service cycle of extraction, and total gas extraction volume [3][4][5][6] . Current common casing techniques for soft coal seams often encounter problems such as coal dust clogging the casing [7] and high stress attening the casing [8] .…”

Section: Introductionmentioning

confidence: 99%

Development and performance study of a composite protein foaming agent based on human hair residue

Zhang,

Han,

Feng

et al. 2023

Preprint

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The instability and collapse of drilling holes in gas extraction seriously affect the effectiveness of gas extraction. Developing high-performance drilling protection materials is of great significance to ensure the effectiveness of gas extraction. In response to the need for high strength and permeability of drilling protective materials, this article selects human hair residue as the mother liquor material for composite protein foaming agents based on the high protein content of animal hoof horns and hair materials. Reasonable hydrolysis solution and its ratio have been determined, as well as the optimal active agent, foam stabilizer and their dosage .A new type of Foam concrete material with high strength, high permeability and environmental protection was developed by mixing and improving the foaming agent, and the optimal amount of foam was determined based on its compressive strength and permeability experiments. The results show that: 1) The foaming volume of foaming agent mother liquor prepared by NaOH after stirring for 1 min is 1.58 times of the foaming volume of foaming agent mother liquor prepared by Ca (OH) 2, while the 1-hour subsidence distance of NaOH hydrolytic foaming agent mother liquor is only 0.59 of that of Ca (OH) 2 hydrolytic foaming agent mother liquor, and the hydrolysis rate of NaOH is significantly higher than that of Ca (OH) 2. When sodium hydroxide is selected to hydrolyze protein, the optimal ratio of foaming agent mother liquor to water is 1:4. 2) K12, AOS, and SLS have very significant foaming effects on protein mother liquor, while LAS has extremely poor foaming effect.The foaming volume SLS>AOS>K12 indicates that SLS has the best foaming performance; The 1-hour settlement distance AOS>K12>SLS indicates the optimal foam stability performance of AOS; The variation curves of foam volume and 1-hour settling distance with the dosage of the four composite systems of active agents all roughly show an inverted "V" shape, and the optimal dosage of active agents is 2.0g/L. 3) Compared with the foam stabilizer Gum arabic and Calcium stearate, Calcium stearate has a better effect as the mother liquor mixed with anionic foam stabilizer and anionic surfactant. It is determined that the best combination scheme for foam performance is 2.0g/L lauryl polyoxyethylene ether sodium sulfate (SLS)+0.3% Calcium stearate. 4) The Foam concrete developed based on the compound foaming agent of human hair and slag has high strength (the strength exceeds 11MPa) and high permeability (the average permeability reaches 2.13MD); With the increase of foam content, the porosity of Foam concrete gradually increases, the permeability first increases and then decreases, and the compressive strength gradually decreases. When the amount of foaming agent is 25ml, its performance is the best.

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The Mechanics of Frost Heave with Stratigraphic Microstructure Evolution: A New Fractal Model for Investigating the Micro-Macro Behaviors of Geotechnical Engineering in Cold Regions

Cited by 3 publications

References 0 publications

Response law and indicator selection of seismic wave velocity for coal seam outburst risk

Response law and indicator selection of seismic wave velocity for coal seam outburst risk

Development and application of high-performance drilling hole protection materials

Development and performance study of a composite protein foaming agent based on human hair residue

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