Filling wall and construction method of flexible yield protection roadway without coal pillar filling mining

Abstract

The invention provides a filling wall body capable of protecting a laneway through soft yielding in non-chain-pillar filling mining and a construction method of the filling wall body capable of protecting the laneway through soft yielding in non-chain-pillar filling mining, and belongs to the coal mine tunnel supporting and protecting technology. The filling wall body is composed of an upper portion and a lower portion, wherein the upper portion is an expansible organic foaming filling main wall body with large shrinkage, the foaming multiple ranges from 10 to 75, the uniaxial compressive strength is not more than 1.2Mpa when the volume compression amount is 80%, the lower portion is a paste-like filling main wall body, the paste-like filling main wall body is composed of the mixture of water, cement, coal ash, river sand and gangue according to the mass ratio of 1:0.3:1.2:1.7:2.8, the 1d uniaxial compressive strength is larger than 1.2Mpa, and the 28d strength is larger than 10Mpa. The filling height and the configuration proportion of the two filling main wall bodies are adjusted through calculation, therefore, the contractibility of the filling wall body can be kept within a reasonable range, the filling wall body capable of protecting the laneway through soft yielding in non-chain-pillar filling mining can better adapt to the motion law of the roof strata, and the stability of gob-side entry retaining is guaranteed.

Description

1. Technical field [0001] The invention belongs to coal mine roadway support technology, in particular to a filling wall body and a construction method of a flexible pressure protection roadway without coal pillar filling mining. 2. Background technology [0002] Gobside retaining is a form of coal-pillar-free roadway protection. Among them, coal-pillar-free roadway protection is a major change in coal mining and mining roadway support technology. The amount of roadway excavation can alleviate the tense situation of mine excavation replacement, improve the maintenance of roadway, improve the efficiency of mine mining, reduce the probability of coal and gas outburst, and realize the intensive production of mines. [0003] At present, the roadside support methods that are widely used at home and abroad mainly include: wooden pile support, dense pillar support, gangue belt support, artificial blocks, and roadside pumped filling material support technology. According to the pri...

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the defects of the existing gob-side entry retaining filling wall with complex structure, difficult construction, high cost, and poor yielding effect, the present invention provides a filling wall for flexible yielding protection entry without coal pillar filling and its construction method. This is a combined filling structure of unequal strength, which has the function of yielding pressure, follows the law of roof sinking along the gob-side entry, and improves the longitudinal shrinkage and lateral stability of the filling wall.

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