SILICA SOL SLOW INFILTRATION REINFORCING METHOD FOR ARGILLACEOUS SOFT ROCK

摘要

Provided is a silica sol slow infiltration reinforcing method for argillaceous soft rock, comprising the following steps: a. lithological changes, pore development characteristics and hydrogeological conditions of roadway surrounding rock are evaluated, and grouting hole (1) parameters and silica sol ratio are determined; b. grouting holes (1) are constructed before argillization, grouting pipes (2) are mounted and the holes are sealed, and silica sol is injected, and in the same time period the silica sol quickly fills and reinforces macrofissures under the drive of a grouting pressure; and c. when the grouting pressure is reduced to a certain value, and the low pressure is maintained for a long time, and in the same time period the silica sol slowly diffuses and enters microfissures of the rock mass under the drive of a capillary force to form a highly-compact reinforced mass, such that the reinforcing of the surrounding rock is complete. The method not only has the macrofissures filled, but also enables microchannels of water molecules and air molecules in a mud rock matrix to be closed, substantially hinders microcosmic effects such as adsorption, dissolution and weathering, improves the compactness and integrity of microstructures of the mud rock, reduces the permeability, and improves the deformation resistance and durability of the rock mass.