The Study of Fractured Rock Mass Instability of the Law Based on the Hydraulic Fracturing

2012 ◽  
Vol 496 ◽  
pp. 538-541
Author(s):  
Zhi Qiang Kang ◽  
Wein Jie Li ◽  
Yu Bo Jia
Keyword(s):  
Rock Mass ◽  
Hydraulic Fracturing ◽  
Hydraulic Fracture ◽  
Fractured Rock ◽  
Water Pressure ◽  
Overburden Rock ◽  
Fractured Rock Mass ◽  
Water Seepage ◽  
Vertical Loading ◽  
The Law

Fractured rock mass, Hydraulic fracture, RFPA2D-Flow, Instability of the law. Abstract. Based on the theory of fluid-solid coupling, Studying on the effect of permeability about damage and stress, Analysis of influence factors what hydraulic fracturing process, fracture propagation pattern, and influencing factors including shape and magnitude of inlet hole, stress conditions, and specimen strength were investigated. Application of rock failure process analysis software coupled seepage-stress F-RFPA2D, numerical simulated rock water pressure to cause crack rupture instability process, research the fracture law of the rock on water pressure and vertical loading. Combine similar physical experiment model, contrast analysis of two broken results and stress-strain curve, reveals instability mechanical behavior of rock hydraulic fracture process. Obtain deep mining in the process of mine water seepage and water extrude, overburden rock crack up, expand, water seepage, water extrude, instability rupture process rules.

Numerical Simulation and Analysis of Rock under Hydraulic Fracturing Based on Acoustic Emission Monitoring

2011 ◽  
Vol 382 ◽  
pp. 458-461
Author(s):  
Zhi Qiang Kang ◽  
Yun Fei Zhou ◽  
Run Sheng Wang
Keyword(s):  
Numerical Simulation ◽  
Hydraulic Fracturing ◽  
Mine Water ◽  
Water Pressure ◽  
Overburden Rock ◽  
Deep Mining ◽  
Water Seepage ◽  
Vertical Loading ◽  
Rock Structure ◽  
Fracturing Process

According to the problem of mine water bursting frequent accidents when Mine into the deep mining. Based on the theory of fluid-solid coupling, accounting for the effect on permeability by damage and stress. Analysis of influence factors what hydraulic fracturing process, fracture propagation pattern, and influencing factors including shape and magnitude of inlet hole, stress conditions, and specimen strength were investigated. Hydraulic fracturing is not only a natural action but also an artificial method to alter rock structure. Application of rock failure process analysis software coupled seepage-stress F-RFPA2D, numerical simulated rock water pressure to cause crack rupture instability process, research the fracture law of the rock on water pressure and vertical loading. Combine similar physical experiment model, contrast analysis of two broken results and stress-strain curve, reveals instability mechanical behavior of rock hydraulic fracture process. Obtain deep mining in the process of mine water seepage and water extrude, overburden rock crack up, expand, water seepage, water extrude, instability rupture process rules. numerical simulation results and experimental results has good uniformity, for disaster of the mine water extrude has immeasurable prediction practical.

scholarly journals Numerical Analysis of the Mud Inflow Model of Fractured Rock Mass Based on Particle Flow

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Yongjian Pan ◽  
Huajun Wang ◽  
Yanlin Zhao ◽  
Qiang Liu ◽  
Shilin Luo
Keyword(s):  
Rock Mass ◽  
Pressure Gradient ◽  
Flow Direction ◽  
Fractured Rock ◽  
Water Pressure ◽  
Water Inrush ◽  
Quadratic Function ◽  
Particle Flow ◽  
Fractured Rock Mass ◽  
Particle Flows

Water inrush and mud outburst are one of the crucial engineering disasters commonly encountered during the construction of many railways and tunnels in karst areas. In this paper, based on fluid dynamics theory and discrete element method, we established a fractured rock mass mud inflow model using particle flow PFC3D numerical software, simulated the whole process of fractured rock mass mud inflow, and discussed the effect of particle size and flow velocity on the change of pressure gradient. The numerical simulation results show that the movement of particles at the corner of the wall when the water pressure is first applied occurs similar to the vortex phenomenon, with the running time increases, the flow direction of particles changes, the vortex phenomenon disappears, and the flow direction of particles at the corner points to the fracture; in the initial stage, the slope of the particle flows rate curves increases in time, and the quadratic function is used for fitting. After the percolation velocity of particles reaches stability, the slope of the curve remains constant, and the primary function is used for fitting; the particle flow rate and pressure gradient are influenced by a variety of factors, and they approximately satisfy the exponential function of an “S” curve.

Research on Seepage Field in Fractured Rock Mass of Underground Oil Storage Cave Using Distinct Element Method

2013 ◽  
Vol 353-356 ◽  
pp. 619-623
Author(s):  
Song Yu ◽  
Yun Peng Zhang ◽  
Wei Shen Zhu
Keyword(s):  
Rock Mass ◽  
Fractured Rock ◽  
Distinct Element ◽  
Water Pressure ◽  
Hydraulic Pressure ◽  
Fractured Rock Mass ◽  
Water Curtain ◽  
Oil Storage ◽  
Underground Caverns ◽  
Element Method

The distribution of hydraulic pressure in fractured rock mass surrounding caverns after excavation and technique of stochastic generation of joint network are investigated based on discrete element method. In order to seal the oil in underground caverns with water in the actual engineering, a water curtain with water pressure is installed, and the changes of hydraulic pressure are simulated with a series of curtain pressures. It is shown that some joints that have been drained out during excavation can not be saturated if the water curtain pressure is less than a certain value. Water curtain pressure with a certain value gives a strong safe guarantee of saving oil in the underground petroleum storage caverns.

Study on Seepage Field of Artificial Water Curtains for Underground Petroleum Storage Caverns in Fractured Rock Mass

2013 ◽  
Vol 353-356 ◽  
pp. 1666-1670
Author(s):  
Yun Peng Zhang ◽  
Song Yu ◽  
Wei Shen Zhu
Keyword(s):  
Rock Mass ◽  
Fractured Rock ◽  
Distinct Element ◽  
Water Pressure ◽  
Underground Water ◽  
Calculation Model ◽  
Fractured Rock Mass ◽  
Water Curtain ◽  
Underground Caverns ◽  
Water Seal

Based on joint statistics from the in-situ survey, using numerical simulation technique of joint network (Monte-Carlo method), the calculation model of fractured rock mass is generated. Underground seepage discharge filed in fractured rock mass surrounding storage caverns is analyzed by using distinct element method. The result of simulation has shown good agreement with surveying data. Two cases have been simulated that is water curtains is installed and is not installed. Water pressure distributions in joints are investigated in these two cases. It is shown that in the case without water curtain the groundwater in joints which locate the upper of underground caverns is drained out and water sealed conditions is completely unrealized. When water curtain pressure is set at 0.3MPa, can underground water seal the storage caverns.

LABORATORY INSTALLATION SIMULATING A HYDRAULIC FRACTURING OF FRACTURED ROCK MASS

2020 ◽  
Vol 56 (6) ◽  
pp. 1053-1060
Author(s):  
S. V. Serdyukov ◽  
L. A. Rybalkin ◽  
A. N. Drobchik ◽  
A. V. Patutin ◽  
T. V. Shilova
Keyword(s):  
Rock Mass ◽  
Hydraulic Fracturing ◽  
Fractured Rock ◽  
Fractured Rock Mass ◽  
Laboratory Installation

scholarly journals Experimental Study of Joint Roughness Influence on Fractured Rock Mass Seepage

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Zhongxi Tian ◽  
Chunquan Dai ◽  
Qingshuang Zhao ◽  
Zhaobo Meng ◽  
Baoliang Zhang
Keyword(s):  
Rock Mass ◽  
Fractured Rock ◽  
Water Pressure ◽  
Rock Fracture ◽  
Single Fracture ◽  
Fractured Rock Mass ◽  
Joint Roughness ◽  
Joint Surfaces ◽  
The Mean ◽  
Mean Variance

Surrounding rock pressure, water pressure, and joint roughness are the important factors that affect the fractured rock mass seepage. It is of great significance to quantify the influence of these factors through experiments. In this study, rock fracture joint surfaces were measured. Next, 3D coordinates of joint surfaces were extracted with using the Geomagic software, and joint roughness was described using the mean variance of protrusion height and equidistant fluctuation angle, which were acquired through calculation. Stress-seepage coupling test was then conducted on the samples on a triaxial apparatus, and the effects of confining stress and water pressure on the permeability of single-fracture rock were investigated. On the basis of the relationship between the parameters in data fitting expression and the mean variance of protrusion height and equidistant fluctuation angle, the calculation formula of the permeability coefficient including joint roughness, confining pressure, and seepage pressure difference was derived.

Mechanism of Water Inflow of Subsea Tunnel Induced by Blasting Excavation

2013 ◽  
Vol 353-356 ◽  
pp. 1566-1571
Author(s):  
Yong Sheng Liu ◽  
Jian Guo Peng ◽  
Jing Hua Zhang ◽  
Li Xin Fu
Keyword(s):  
Rock Mass ◽  
Stress Field ◽  
Fractured Rock ◽  
Water Pressure ◽  
In Situ Stress ◽  
Static Stress ◽  
Water Inflow ◽  
Fractured Rock Mass ◽  
Blasting Excavation ◽  
Subsea Tunnel

Water inflow was the main damage during blasting excavation of subsea tunnel, disturbance due to blasting could also induce water inflow. Based on the blasting mechanism of water-bearing fractured rock-mass, stress state and breaking-down process of the fracture was analyzed, which was affected by dynamic stress field (blasting effect) and static stress field (water and in-situ stress). With the affect of overlapping dynamic and static stress field, the calculation formula of the critical inner water pressure in water inflow was presented. At last, using these formulas, critic water press and radial extent were calculated of water-bearing fractured rock-mass in Xiamen subsea tunnel.

Research on Seepage Field of Underground Petroleum Storage Caverns in Fractured Rock Mass

2012 ◽  
Vol 594-597 ◽  
pp. 2569-2573 ◽  
Author(s):  
Yun Peng Zhang ◽  
Song Yu ◽  
Wei Shen Zhu
Keyword(s):  
Rock Mass ◽  
Fractured Rock ◽  
Water Pressure ◽  
Fractured Rock Mass ◽  
Water Curtain ◽  
Pressure Distributions ◽  
Underground Caverns ◽  
Water Seal ◽  
Petroleum Storage ◽  
Discharge Field

Underground seepage discharge field in fractured rock mass surrounding storage caverns is analyzed by using discrete element method and stochastic joint-generation method. Meanwhile water pressure distributions in joints are investigated with a series of curtain pressures and compared with no water curtain. In the case without water curtain the groundwater in joints which locate the upper of underground caverns is drained out and water-seal conditions are completely unrealized. When the water curtain pressure is less than a certain value, the joints that have been drained out can not be saturated, and only the water curtain pressure exceeds this certain value, can groundwater seal the storage caverns.

Sign in / Sign up

Export Citation Format

Share Document