This article, through indoor experiment and theoretical analysis, studied the pressure-fissurc grouting mechanism, held that the pressure-fissure grouting process are the processes of the ence, deveiopment and linking up by fissures insids the rocks under the stress and grout joint action, it generalized the four principles for pressure-fissure grouting to follow.

The mechanism research on two times high-pressure splits grouting;

This paper analyze the construction effect by static pressure and fracture grouting process on soft ground at a section of railway foundation of Bin Sui railway, and presents some problems which need to be noticed in the design of ground process in analogous formations.

Experiment of fracturing grouting in soft flowing mucky clay in Nanjing tunneling construction;

Steel floral tube fracturing grouting technology is adopted in slop reinforcement of Shenzhen Buji eastern and western main-road.

The design method and construction process of fracturing grouting method applied in soft foundation treatment in operating Harbin—Suifenhe railway are introduced in details.

Penetration radius and grouting pressure in fracture grouting;

Following fracture grouting and reinforcement of soft clay,the grout concretion in the clay will form a veined supporting frame,leading to significant increase in compression module of the resulting composite mass.

In this paper,factors exerting influences on beating capacity and working mechanism of split- ring grouting have been analyzed for the soil layer anchor pole,and deducing of calculation parameter is completed for splitting grouting.