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 accor...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.展开更多
The rheological behavior of phosphoric acid-water glass grout in different mixing ratios was studied. Grout made of water glass with Baume degree of 20° and 13.4% phosphoric acid by 1:1 volume ratio is found to b...The rheological behavior of phosphoric acid-water glass grout in different mixing ratios was studied. Grout made of water glass with Baume degree of 20° and 13.4% phosphoric acid by 1:1 volume ratio is found to be more effective in stopping water. Laboratory model test of water shutoff by grouting was conducted. Test results show that the diffusion length and water cutoff effect of the grout are significantly improved as the grout head is raised, due to the dilution of underground water, and it takes the grout longer than its gel time to cut off water.展开更多
基金Foundation item: Project(40372124) supported by the National Natural Science of China project(05R214145) supported by Postdoctor Research Foundation of Chinaproject(B308) supported by Shanghai Leading Academic Discipline
文摘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.
基金Projects(41472278,41202220)supported by the National Natural Science Foundation of ChinaProject(20120022120003)supported by the Research Fund for the Doctoral Program of Higher Education,China+1 种基金Project(2652012065)supported by the Fundamental Research Funds for the Central Universities,ChinaProject supported by Beijing Higher Education Young Elite Teacher Program,China
文摘The rheological behavior of phosphoric acid-water glass grout in different mixing ratios was studied. Grout made of water glass with Baume degree of 20° and 13.4% phosphoric acid by 1:1 volume ratio is found to be more effective in stopping water. Laboratory model test of water shutoff by grouting was conducted. Test results show that the diffusion length and water cutoff effect of the grout are significantly improved as the grout head is raised, due to the dilution of underground water, and it takes the grout longer than its gel time to cut off water.