Mine soft rock grouting test piece indoor simulation manufacturing method and manufacturing device

Abstract

The invention discloses an indoor simulation fabrication method and device of a soft rock grouting test piece for a mine and belongs to the geotechnical engineering field. The method comprises the following steps: firstly, machining a simulation fabrication device, wherein the simulation fabrication device comprises a test piece loading system, a slurry stirring system, a grouting system and a monitoring system; in a fabrication process, fixing fabricated soft rock test pieces in a loading oil cylinder, then simulating a field grouting environment, starting grouting, stopping grouting when reaching a preset grouting pressure trial value and preset grouting time, taking out the soft rock grouting test pieces after initial setting, maintaining the soft rock grouting test pieces, respectively carrying out a mechanical experiment on all the maintained soft rock grouting test pieces, and carrying out analysis according to the amount of seepage, the water-ash ratio of slurry and the moisture content of the soft rock test pieces so as to obtain a moisture transformation rule in the grouting process; and finally, analyzing experimental results, and preferably selecting grouting parameters suitable for grouting of field construction so as to provide basis to the grouting of field construction in the future, wherein the grouting parameters include a matching relation between the type of slurry and a grouted medium, grouting pressure and grouting time.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and in particular relates to an indoor simulation manufacturing method and a manufacturing device of a mine soft rock grouting test piece. Background technique [0002] In the fields of mines, tunnels, slopes and water conservancy and hydropower projects, soft rock has a significant impact on the engineering stability, mainly in the following aspects: (1) The mechanical strength of soft rock is low, and there is a possibility of large deformation, instability and damage. (2) The soft rock contains mostly karst water, which is highly erosive to the support and affects the service life of the project. Practice has shown that for weak rock mass, it is difficult to effectively control the deformation and failure of the general support means such as anchors, nets, sheds, and frames. The bolt-grouting (referred to as anchor injection) reinforcement method is often used on site to modify the soft...

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Problems solved by technology

[0005] Chinese Patent Publication No. (ZL200720310235.6) discloses a "high-pressure grouting test model device". When grouting with this device, only uniaxial compression and grouting pressure can be considered, and the influence of confining pressure cannot be considered, and it cannot be guaranteed The grout is evenly injected into the injected test piece, which makes it difficult for the rock test piece after grouting to simulate the actual grouting environment, and the on-site grouting parameters cannot be accurately determined

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