High-pressure Water Pressure Test In The Pushihe Pumped Storage Power Station

Pore water pressure test is conducted in a borehole in situ permeability test,its purpose was to determine rock mass permeability,for the evaluation of rock permeability and seepage control measures to provide basic information;can qualitatively understand the different depths underground hard or semi-hard rock relative permeability and the relative development level of fracture,the assessment of the integrity and permeable rock the degree of proof and the reservoir rock foundation of hydraulic structures of the penetration,the stability of underground caverns and the development of anti-seepage for the foundation treatment for necessary basic information。Conventional water pressure test does not reflect the effect of rock mass in the high permeability of head because under high-pressure water,cracks in the rock mass (weak structure plane) are likely to open and expand,thus changing the mass of the original drainage conditions。Of high head power plants under the action of rock in the high-pressure water permeability and water infiltration under high-pressure rock open,critical hydraulic fracturing pressure and permeability, the high-pressure tunnel,high bifurcation structure type and seepage control grouting pressure choices are of great significance。Reflecting the high water pressure test in fractured rock permeability at the same time,various types of structural surface can be evaluated against the critical failure of hydraulic fracturing pressure size,for the design parameters。China has carried out dozens of hydraulic high-pressure water pressure test drilling work,while the current survey and design of Water in clear requirements for pumped storage power station to be high water pressure test。But the high water pressure test is currently no specific national or industry developed test procedures,reference holes are generally normal water pressure test procedures。Experience in the domestic high-pressure water pressure test is not very mature,different theory。Pushihe Pumped Storage Power Station Bifurcation of water pressure test site aims to provide a good example and accumulated experience,similar projects in future issues for research and reference value with a reference guide。Pushihe Northeast's first pumped storage power station is a large power station,installed capacity of 1200MW,4 unit 2 hole,high pressure inside the branch pipe to withstand the maximum head of about 480m,with"Bu"flat-shaped bifurcation type,PD is large,is a large reinforced concrete manifold。Bifurcation site by the reinforced concrete lining,so the value of hydraulic fracturing of rock in situ,and high-pressure water permeability are crucial data。Research paper :"Pushihe Pumped Storage Power Station for high-pressure branch pipe parts selection is representative rocks,the water pressure inside the tubes of 1.2 times the specialized water pressure test,permeability test and the critical hydraulic rock splitting pressure split value"。Of rock under high pressure water permeability of rock in the open under high pressure infiltration,the critical tensile stress and deformation of rock mass;evaluation of various types of structural failure of hydraulic fracturing surface resistance value of the size of the critical pressure。Thesis Pushihe power station high pressure branch pipe part of the theme of water pressure test for Power Plant High Pressure Bifurcation Pushihe high water pressure area to study and analyze test data,obtained during the test to correctly understand the flow -pressure curves reflect the physical and mechanical rock nature more clearly understand the high permeability of rock,so it may make appropriate permeability parameters。Using high pressure water pressure test data and the high pressure branch pipe excavation revealed parts of underground geological data and regional information,scientific and rational analysis,correctly pointed out that the nature of the bifurcation of different parts of the permeability of rock types and the critical cleavage stress value。Water pressure test before the television through the hole and drilling core catalog data to conduct a reasonable segment,and there is no fixed segment length,but the geological conditions under the test section of drilling into intact rock,fractured rock。The experimental stage and reasonable custom,cycle times,duration , determine the maximum test pressure of 6.0 Mpa。Experiments were divided into 6 segments, each test during the high water pressure before the conventional water pressure test。Fractured rock mass in which double-loop pressure (vacuum) mode,complete with round robin rock pressure way。Papers under High Pressure Bifurcation Pushihe site power station high water pressure test data obtained fracture intact rock and rock permeability and high water pressure were drawn,the conventional water pressure P-Q curve and P-T curves of the critical hydraulic fracturing pressure。Compared conventional pressurized water and high water pressure data,obtained under high-pressure water permeability of different rock。Failure mechanism through the analysis of infiltration,permeability,hydraulic fracturing pressure,and infiltrate the hydraulic gradient,seepage deformation study the following conclusions:1)Obtained in this experiment were fractured intact rock and rock permeability, and characteristic curves were plotted。2)Since the original rock permeability rate is very small,roughly splitting the water permeability after 1Lu so。3)This experiment showed that the intact rock in the high-pressure water (up to 6.0 MPa) under,no inflection point occurs,that does not produce hydraulic fracturing,permeability and no significant change;fractured rock or more have developed hydraulic fracturing,there Inflection point,that is,the phenomenon of the sudden increase in the amount of rock permeability。4)Determine the critical pressure of hydraulic fracturing using P-Q curve inflection point to determine whether there is reasonable and feasible。Can also occur through the infiltration and sabotage to determine whether the rock mass。5) According to the results of this experiment,the proposed design review of high-pressure branch pipe lining parts of the form。The test for determining the branch pipe lining in the form and filling pressure provides the key data issues for future studies of similar projects,with reference and reference value。However,this test pilot hole, and absence of pressure head in the permeability of rock mass under the action of impact on adjacent buildings,in future trials should be further studied。...