Penetration grouting reinforcement of sandy gravel

To study the relationship between grouting effect and grouting factors, three factors （seven parameters） directionless pressure and small cycle grouting model experiment on sandy gravel was done, which was designed according to uniform design method. And regressing was applied to analysis of the test data. The two models test results indicate that when the diffusing radius of grout changes from 26 to 51 cm, the grouted sandy gravel compressing strength changes from 2.13 to 12.30 MPa; the relationship between diffusing radius（R） and water cement ratio（m）, permeability coefficient（k）, grouting pressure（p）, grouting time（t） is R=19.953m^0.121k^0.429p^0.412t^0.437; the relationship between compressing strength（P） and porosity（n）, water cement ratio, grouting pressure, grouting time is P =0.984n^0.517m6-1.488p^0.118t^0.031. So the porosity of sandy gravel, the permeability coefficient of sandy gravel, grouting pressure, grouting time, water cement ratio are main factors to influence the grouting effect. The grouting pressure is the main factor to influence grouting diffusing radius, and the water cement ratio is the main factor to influence grouted sandy gravel compressing strength.

To study the relationship between grouting effect and grouting factors,three factors(seven parameters) directionless pressure and small cycle grouting model experiment on sandy gravel was done,which was designed according to uniform design method.And regressing was applied to analysis of the test data.The two models test results indicate that when the diffusing radius of grout changes from 26 to 51 cm,the grouted sandy gravel compressing strength changes from 2.13 to 12.30 MPa;the relationship between diffusing radius(R) and water cement ratio(m),permeability coefficient(k),grouting pressure(p),grouting time(t) is R=19.953m0.121k0.429p0.412t0.437;the relationship between compressing strength(P) and porosity(n),water cement ratio,grouting pressure,grouting time is P=0.984n0.517m-1.488p0.118t0.031.So the porosity of sandy gravel,the permeability coefficient of sandy gravel,grouting pressure,grouting time,water cement ratio are main factors to influence the grouting effect.The grouting pressure is the main factor to influence grouting diffusing radius,and the water cement ratio is the main factor to influence grouted sandy gravel compressing strength.