Hydraulic fracturing testing machine for concrete members under reciprocating load and high water pressure

Abstract

The invention provides a hydraulic fracturing testing machine for concrete members under reciprocating load and high water pressure. The testing machine comprises an MTS testing machine actuating head, an axial force sensor, an actuating connecting rod, a wedge-shaped loading frame, bearings, force transmitting steel shafts, small axial force sensors, small actuating connecting rods, linear guide rails, a high-pressure seal cylinder, seal cylinder connecting rods, a non-contact optical measurement window, an exhaust hole and a water injection tube, wherein the transmission part consisting of the small actuating connecting rods, the small axial force sensors, the bearings and the force transmitting steel shafts is perpendicular to the linear guide rails throughout; the outer edge surface of the wedge-shaped loading frame and the linear guide rails are used for providing the reciprocating load during opening and closing of fractures; the real-time condition of the fractures in nearby areas can be recorded through the non-contact optical measurement window, and water pressure distribution among the fractures is measured through water pressure measuring holes. The testing machine has multiple test functions, is convenient and controllable to operate and simple in structural design and can be used for research on hydraulic fracturing of the concrete members under reciprocating load and high water pressure.

Description

technical field [0001] The invention belongs to the technical field of hydraulic splitting simulation experiments of hydraulic concrete buildings, and in particular relates to a hydraulic splitting testing machine for concrete components under the action of reciprocating load and high water pressure. It is not only suitable for exploring the mechanism and law of hydraulic splitting of cracks in hydraulic concrete structures under the action of dynamic load and high water pressure, but also can be used to study methods to reduce the hazards of hydraulic splitting and ensure structural safety. Background technique [0002] Hydraulic fracturing was first used in petroleum engineering, and it is often used to speed up the extraction of oil and promote the growth of production. The existing cracks or voids in the rock mass or concrete structure under the action of high-pressure water, such as expansion, expansion, and interpenetration, are collectively referred to as hydraulic sp...

AI Technical Summary

Problems solved by technology

The former can only measure the hydrostatic pressure and the final expansion path of the crack when the concrete member splits, and cannot observe the crack expansion in real time, let alone the relationship between crack expansion, reciprocating load and water pressure; the latter can be measured by adjusting different loads. The change of water pressure in the crack is obtained, and the influence of the joint action of static load and water pressure on the crack expansion of concrete members is obtained. Most of these can only be used for the study of static load, and it is difficult to apply reciprocating loads such as earthquakes. Although some scholars By adding springs or magnets to the loading frame, the static load is converted into dynamic load, and the opening and closing process of the crack is simulated, but the strength of the spring or magnet is limited, and the closing process of the crack is not sufficient, and there is a big gap with the actual project.

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