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.