A fracture seepage tester under the action of high water head and high stress

Abstract

The invention discloses a crack seepage tester under effects of high water head and high stress. The tester comprises a test groove, a front water collection tank, a rear water collection tank, and avertical pressure device. The front water collection tank and the rear water collection tank are connected to two opposite lateral walls of the test groove respectively and apply horizontal pressure on the test groove. The vertical pressure device is arranged above the test groove and applies vertical pressure on the test groove. Through the provided tester, the water-force coupled seepage characteristics of cracks in a diaphragm wall in a deep overburden layer and soil-stone of foundation can be well studied. The research results can more accord with the actual situation. Scientific references and technical support are provided for the reinforcement of diaphragm wall and seepage-proofing design of deep overburden layer.

Description

technical field [0001] The invention belongs to the technical field of hydraulic engineering, and in particular relates to a crack seepage tester under the action of high water head and high stress. Background technique [0002] Deep overburden is a complex geological condition often encountered in the development of hydropower projects in southwest mountainous areas in my country in recent years, with a thickness of tens to hundreds of meters. At present, the seepage control of this type of foundation mostly adopts the vertical anti-seepage method, and the concrete anti-seepage wall is the first choice and the most reliable engineering measure. [0003] However, the thinner wall thickness of the concrete cutoff wall is very easy to cause different cracks during the construction and operation period due to various reasons: during the construction of the cutoff wall, due to the complex foundation conditions and poor quality of clay mud Problems such as construction technolog...

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Problems solved by technology

[0007] ① Deficiencies in crack simulation. Parallel glass plates can be used to simulate smooth cracks, but cracks of different types and roughness cannot be simulated, while cracks in actual cut-off walls are rough and have various crack forms;

[0008] ②It can only reflect the influence of groundwater on the seepage characteristics of fractures alone, but cannot reflect the actual seepage of fractures under the condition of stress coupling, let alone the coupling effect under high water head-high stress, which is far from the actual engineering, and the test results cannot be very accurate. It can well reflect the actual hydraulic-mechanical environment of the cut-off wall in the deep overburden layer, and has little significance for engineering guidance;

[0009] ③ The conditions and process of crack filling under different graded soils cannot be reflected from the mesoscopic point of view, and only the filling effect of fine aggregates on flat plate cracks can be considered alone. Therefore, the actual crack filling of concrete cutoff walls is related to load, water pressure and crack opening The relationship between density and particle diameter is still far from clear, and it is not enough to provide scientific basis and technical support for the reinforcement treatment of cut-off walls and the seepage-proof design of deep covering layers.

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