The key technology of chemical grouting by breaking the wall to prevent leakage are the followings: choosing the chemical material, determining the grouting pressure, estimating the diffusion radius of grouting liquids, arranging grouting holes and calculating the grouting quantity.

The engineering techniques mending shaft lining ruptures in coal mine area covered by thick overburden soils in Eastern China are introduced, and two grouting techniques (grouting from the surface and grouting through the shaftlining) are chiefly discussed on their technics flows and their advantages disadvantages.

Analysis and application of chemical grouting reinforcement mechanism to broken coal and rock mass;

The adoption of the chemical grouting method is one of the important effective methods in underground water control and prevention or soft rock reinforcement in mining face.

However, through the new technology of chemical grouting of backfilling, the water yield falls to 2.

Given the deep overburden of shield access shaft section, high water table, the complicated geological conditions, it was intended to use heavy jet grouting and chemical injection technique to consolidate the ground in conjunction with requirements from shaft structure, and from later phases of construction, after a comparative verification of.

By using the combined support technology of concrete sprayed anchored net,anchorage cable and backwall grouting in the mechanical and electronic underground chamber of Shuangmiao extending area of Gedian Mine,Shenhuo Coal and Electricity Joint-stock Company,the tunnel condition is effectively improved,the deformation of the surrounding rock is inhibited.

This paper introduced backwall grouting process and grouting effect of-290 level downcast shaft in Jilongshan Gold Mine.