Low-dip-angle weak structural surface after-grouting seepage deformation field test method and sample device

Abstract

The invention provides a low-dip-angle weak structural surface after-grouting seepage deformation field test method and a sample device. According to the method, a rock sample block which is collectedfrom an engineering field and provided with a weak structural surface is subjected to grouting treatment, and a piezometer tube is arranged inside the rock sample block; the two sides of the rock sample block serve as a water-in surface and a water-out surface respectively, and the weak structural surface is exposed on the water-in surface and the water-out surface; and a water-in bin and a water-out bin are arranged at the water-in surface side and the water-out surface side respectively, the water-in bin and the water-out bin are filled up with cobblestones, and reinforced concrete is poured outside the rock sample block, the water-in bin and the water-out bin for sealing. The sample device is provided with a water-in pipe and an exhaust pipe for the water-in bin and is provided with awater-out pipe for the water-out bin, the height of an opening of the water-in pipe of the water-in bin is consistent with that of the bottom of the rock sample block, and the height of an opening ofthe water-out pipe of the water-out bin is consistent with that of the top of the rock sample block. Through the method, a seepage determination test can be performed on an original sample subjected to simulated grouting treatment to determine after-grouting seepage deformation parameters of the weak structural surface for dam design and calculation.

Description

technical field [0001] The invention relates to a field test method and a sample device thereof for seepage deformation after grouting on a weak structural surface with a gentle inclination angle. Background technique [0002] With the technological development of water conservancy and hydropower industries, the height of modern dams is getting higher and higher, and the storage capacity of reservoirs is getting bigger and bigger, and the requirements for dam foundations are getting higher and higher. The water pressure is mainly transmitted from the dam body to the abutment and the bearing of the foundation. The dam foundation must be selected on a complete and stable bedrock, and various geological structures are often developed in the bedrock. The rock mass in these structural belts is broken and filled with mud, cuttings, horns Gravel, etc., if exposed on the foundation of the dam, will have a great impact on the stability of the dam and the leakage of the dam. [0003]...

AI Technical Summary

Problems solved by technology

The indoor undisturbed test is to take the weak material in the structural surface and carry out the penetration deformation test of the small-sized sample indoors. It is simple and easy, but the test results are usually quite different from the field test; Hole pressure water test method and ark in-situ test method. The borehole pressure water test method can only observe part of the water flow, and the reliability of the test results cannot be fully recognized. high cost

The above test methods have solved the problem of the value of the seepage deformation parameters of the structural surface to a certain extent, but none of them can solve the problem of parameter selection of the structural surface after grouting, which is more concerned about the dam foundation.

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