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Direction and influencing factors of hydraulic fracture

Zhao Guoshi,Xu Jian,Qiu Jinping

Strategic Study of CAE 2012, Volume 14, Issue 4, Pages 100-104

Abstract: text-align: justify;">Stress orientations of regional stress field is the main influencing factors for the hydraulicfracture.Most of the hydraulic fracture extend along the greatest principal stress direction, which also affectedLots of hydraulic fracturing have been monitored in the Tamtsag Basin of Mongolia and Hailaer Basin inIt is proved that the rule of the greatest principal stress direction except some anomaly directions.

Keywords： direction of hydraulic fracture geological structure original faults faulting plane

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Hydromechanical model for hydraulic fractures using XFEM

Bo HE

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1, Pages 240-249 doi: 10.1007/s11709-018-0490-6

Abstract: The results suggest that the presence of the fracture in a deforming, porous media has great impact on

Keywords： multi-phase medium porous fracture multi-scale method

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Technology of Coal-Rock Mass Hydraulic Fracture Weakeningand Its Development

Huang Bingxiang,Deng Guangzhe,Liu Changyou

Strategic Study of CAE 2007, Volume 9, Issue 4, Pages 83-88

Abstract: Current research and development trend of hydraulic fracture weakening for hard top-coal or roof wasanalyzed, including the law of crack expanding induced by hydraulic fracture in rock mass, mescoscopiccracked rock mass by seepage pressure and its macroscopic mechanics response, controlling technology of hydraulic

Keywords： hard top-coal(roof) hydraulic fracture crack expanding mescoscopic structure

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Stress distribution in third subsidence belt

Yan Zhitao,Liu Jianzhong,Qiu Jinping,Jin Lihua

Strategic Study of CAE 2009, Volume 11, Issue 2, Pages 33-35

Abstract: justify;">Stress distribution in the third subsidence belt is presented , with great amounts of data on hydraulicfracture orientation obtained from monitoring hydraulic fracturing , and the direction of the maximumresults indicate that the third subsidence belt extends over 1 500 km from north to south , and the directionranges from 55° NE to 75° NE , concentrated on 65° NE , showing a stable distribution of the directionThe monitoring data implies that the tectonic stress direction in third subsidence belt is the combined

Keywords： hydraulic fracturing monitoring with micro- seismics third subsidence belt direction of maximumprinciplestress hydraulic fracturing treatment

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Research on Direction and Location for Danger Prediction of Coal or Rock Dynamic Disaster

Xiao Hohgfei,He Xueqiu,Feng Tao,Wang Enyuan

Strategic Study of CAE 2005, Volume 7, Issue 11, Pages 81-86

Abstract: of coal or rock dynamic disaster such as coal or gas outburst, rock or coal outburst and so on, the directionand location of dangerous areas, that is, how to ascertain the monitoring direction and position forand the direction with most stress or maximum dangers can be ascertained.The outburst danger can be monitored by altering the antenna monitoring direction.The EME measuring results on the spot show that it is feasible to study the direction and location of

Keywords： rock or coal dynamic disaster danger prediction direction and location deformation and fracture of coal

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Horizontal effects in fracturing operation of coal bed methane in Qinshui,Shanxi Province

Li Mengxi,Zhang Cong

Strategic Study of CAE 2012, Volume 14, Issue 4, Pages 16-19

Abstract:

This paper describes horizontal effects of CBM (coal bed methane)fracturing, obtained from microseismic monitoring in Qinshui Basin. It indicates that adjacent wells perpendicular to man-made fractures have adverse effects, including reduced production flow rate, depletion, and watering during fracturing operation simultaneously, while wells along manmade fractures response lag. This discovery shows that the horizontal compression of fracturing could have adverse impact on production of adjacent wells, and fracturing designer should be aware of it.

Keywords： coal bed methane fracture hydraulic fracturing

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Experimental study on slurry-induced fracturing during shield tunneling

Teng WANG, Dajun YUAN, Dalong JIN, Xinggao LI

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2, Pages 333-345 doi: 10.1007/s11709-021-0718-8

Abstract: Hydraulic fracturing may occur and cause a significant decrease in the support pressure if the slurryPreventing the occurrence of hydraulic fracturing in a slurry shield requires investigating the effectsof related influencing factors on the hydraulic fracturing pressure and fracture pattern.compressive strength, slurry viscosity, and axial and circumferential loads, on the fracturing pressure and fractureThe results indicate that the fracture dip is mainly affected by the deviator stress.

Keywords： slurry shield tunneling hydraulic fracturing test fracturing pressure fracture dip unconfined compressive

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A general framework for modeling long-term behavior of earth and concrete dams

Bernhard A. SCHREFLER, Francesco PESAVENTO, Lorenzo SANAVIA, Giuseppe SCIUME, Stefano SECCHI, Luciano SIMONI

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 1, Pages 41-52 doi: 10.1007/s11709-010-0070-x

Abstract: They range from hydraulic fracturing to alkali-silica reaction (ASR) and to repair work in concrete dams

Keywords： earth dams concrete dams multiphase porous materials coupled problems hydraulic fracture concrete hydration

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Tests on impact effect of partial fracture at steel frame connections

CHEN Yiyi, BIAN Ruoning

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 4, Pages 295-301 doi: 10.1007/s11709-008-0049-z

Abstract: Impact effect of sudden fracture at steel frame connections under severe earthquake or other extremeThe relation of impulse caused by structural fracture to the release of inner force at the cracked locationIt is also revealed that the instant fracture of structural connection is characterized by progressiveand partial fracture.Numerical evaluation of the impact effect of connection fracture is carried out.

Keywords： structural fracture natural fracture progressive high-frequency

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Effect of fly ash replacement level on the fracture behavior of concrete

Mahdi AREZOUMANDI, Jeffery S. VOLZ

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 4, Pages 411-418 doi: 10.1007/s11709-013-0228-4

Abstract: results of an experimental investigation that evaluates effect of fly ash replacement level on the fractureThis experimental program consisted of 32 fracture beams to study the fracture behavior of concrete.The experimental fracture energies were compared with the fracture energy provisions of different designevaluate whether or not there is any statistically significant difference between the experimental fracturethese statistical tests show that the mix with higher level of fly ash replacement level has higher fracture

Keywords： concrete fracture energy fly ash

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Computational modeling of fracture in concrete: A review

Luthﬁ Muhammad Mauludin, Chahmi Oucif

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3, Pages 586-598 doi: 10.1007/s11709-020-0573-z

Abstract: This paper presents a review of fracture modeling of concrete.Based on comprehensive literature review, there are two main approaches considered to-date of concrete fractureThe purpose of this review is to provide insight comparison from different techniques in modeling of fractureIn the first section, an overview of fracture modeling in general is highlighted.

Keywords： concrete fracture macroscopic micromechanical heterogeneity

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Computational modeling of fracture in capsule-based self-healing concrete: A 3D study

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6, Pages 1337-1346 doi: 10.1007/s11709-021-0781-1

Abstract: We present a three-dimensional (3D) numerical model to investigate complex fracture behavior using cohesivepre-inserted cohesive elements are also applied into the initial meshes of solid elements to account for fractureThe proposed model provides an effective tool for predicting the complex fracture response of capsule-based

Keywords： 3D fracture self-healing concrete spherical cohesive elements heterogeneous

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Evaluating the material strength from fracture angle under uniaxial loading

Jitang FAN

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2, Pages 288-293 doi: 10.1007/s11709-018-0480-8

Abstract: Generally, shearing fracture model occurs in both the tests.Shearing fracture angle is smaller than 45° under uniaxial compression and greater than 45° under uniaxialof material strength under uniaxial compression and tension is developed by correlating the shearing fracturerelation is quantitatively illustrated by a function for analyzing the material strength from shear fracture

Keywords： strength fracture mechanics

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A dimensional analysis on asphalt binder fracture and fatigue cracking

Qian ZHAO, Zhoujing YE

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 2, Pages 201-206 doi: 10.1007/s11709-017-0402-1

Abstract: Fracture and fatigue cracking in asphalt binder are two of most serious problems for pavement engineersconsists both of dimensional analysis using Buckingham Theorem and -integral analysis based on classic fracturemechanics, to evaluate the fracture and fatigue on asphalt binder.is discovered that the dimensional analysis could provide a new perspective to analyze the asphalt fracture

Keywords： Dimensional analysis asphalt fracture fatigue cracking

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Experimental research on ductile fracture criterion in metal forming

Song YU, Weiming FENG

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3, Pages 308-311 doi: 10.1007/s11465-011-0233-z

Abstract:

Ductile fracture criterion is key limitation parameter in material forming.shearing test on 45# steel are utilized for providing the experimental values of the critical values at fracture, and 11 widely used ductile fracture criterion are selected to simulate the physical experiments andtheir relative accuracy for predicting and quantifying fracture initiation sites are investigated.triaxiality can be estimated successively using both Normalized Cockcroft-latham and the Brozzo ductile fracture

Keywords： ductile fracture criteria metal forming process material experiment stress triaxiality