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Experimental Study and Numerical Simulation on Hydraulic of Fracturing of Rock Mass

Author: ZuoJian
Tutor: ZhanMeiLi
School: Hohai University
Course: Hydraulics and River Dynamics
Keywords: Rock mass Hydraulic fracturing Experimental study Numerical Simulation Virtual contact element Finite Element Method
CLC: TV223.4
Type: Master's thesis
Year: 2006
Downloads: 351
Quote: 1
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Abstract


Hydraulic fracturing of rock mass seepage - stress coupled, it mainly reflects the role of seepage water pressure, the mechanical response of the rock mass and structural changes. With the growing number of social development, water conservancy construction, oil and gas mining, underground nuclear waste storage, geothermal mining geotechnical engineering are in high head, large depth of complex hydrogeological conditions, making the rock hydraulic fracturing by more and more attention. Due to the complexity of the rock mass hydraulic fracturing, today, people on the mechanism of hydraulic fracturing, the occurrence of the conditions of the development process as well as issues such as discrimination method still no good solution. The experimental study and numerical simulation as a means, using the indoor experimental and numerical simulation combining research methods, rock hydraulic fracturing research and research applied to the analysis of practical engineering problems. This article is mainly engaged in the research and the results obtained are as follows: (1) research at home and abroad on the hydraulic fracturing of rock mass with the main direction of development, based on the paper focuses on the problem. Draw on previous research ideas and research methods, the paper finally established research ideas based on experimental studies, combined with theoretical analysis. (2) to carry out the design of the hydraulic fracturing experiment sample, and the material mechanical properties of the cement mortar parameter determination tests focus on testing the design with the ratio of cement mortar compressive strength, tensile strength, elastic modulus, mooring description provides the basis for of cement mortar hydraulic fracturing test the mechanical properties of the sample material loose than the stress to strain curve. (3) rocks of similar materials as cement mortar, design hydraulic fracturing experimental methods. 9 groups of 30 samples of hydraulic fracturing test study for thick-walled cylindrical specimens. Through the analysis of the test results, look for the destruction in the form of hydraulic fracturing, hydraulic fracturing relationship between the critical state of stress in the pore water pressure and specimen damage, and focuses on the splitting mechanism of the permeability pore water pressure, and summarizes semi-empirical relations. Preliminary analysis of the experimental ambient pressure, the inner diameter of the specimen, the load path of the impact of hydraulic fracturing. (4) the introduction of virtual contact surface unit reserved for splitting the unit may occur, the corresponding the invariant grid hydraulic fracturing cracking process simulation algorithm based on the brittle mechanical theory, developed, and developed a three-dimensional rock mass hydraulic fracturing finite element analysis program. By comparison of experimental results with numerical simulation results, verify the correctness of the calculation model and algorithm. (5) above research diversion tunnel lining the hydraulic fracturing calculated analysis applied to the of Oolong Mountain Pumped Storage Power Station. HIGH WATER security and stability of the diversion tunnel works by computational analysis and propose appropriate recommendations to provide a reference for the design and construction of the project. (6) Summary of the unresolved issues in this article suggested.

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CLC: > Industrial Technology > Hydraulic Engineering > Hydraulic investigation of hydraulic design > Foundation and its reinforcement > Seepage of hydraulic structures and impervious
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