Analysis of Factors Affecting Performance of Cement-Bentonite Mud Impervious Wall

Abstract

The triaxial unconsolidated undrained test, unconfined compressive strength test and variable head penetration test were used to study the water-cement ratio (Rwc between 3.85 and 5.88) and water-bentonite ratio (Rwb between 3.85 and 7.14) in different indoor mix ratios. Effect on mechanical properties and permeability of cement-bentonite mud impervious wall. The test results showed that: (1) The unconfined compressive strength of cement-bentonite anti-seepage wall has a double exponential function relationship with water-cement ratio and water-bentonite ratio. (2) When the water-bentonite ratio is constant, the deformation modulus increases with the decrease of water-cement ratio. When the water-cement ratio is constant, the influence of water-bentonite ratio on deformation modulus is not obvious, but too much bentonite will reduce deformation modulus. (3) As the strength of the cut-off wall increases, the modulus of deformation also increases, and there is a good linear relationship between the two. (4) The permeability coefficient of cement-bentonite anti-seepage wall has a double exponential function relationship with water-cement ratio and water-bentonite ratio.