Application of improved soil backfill behind gravity dock walls
LIU Bingbing
SONG Zhijian
WANG Risheng
ZHAO Yuehang
Abstract：To detect the bearing capacity of cement-modified soil with a cement-to-dry-soil mass ratio of 8％as backfill material for gravity-type dock walls,indoor tests such as unconfined compressive strength tests,shear strength tests,point load tests,and California bearing ratio tests are conducted.Using a non-destructive testing method,the mechanical properties and electric field response characteristics of cement modified soil specimens with water content of 7.7％,9.7％,11.7％,13.7％,15.7％,17.7％and 19.7％are studied under the action of single stress field.The test results indicate:1)Under different moisture contents,the resistivity of the specimens decreases rapidly with the increase of load and displacement,and then tended to stabilize.The initial resistivity of specimens with high moisture content is lower than that of specimens with lower moisture content;as moisture content increases,the final displacement of the specimens also increases.The unconfined compressive strength is highly linearly correlated with the initial resistivity and the failure resistivity,indicating that the resistivity method can be used to evaluate the mechanical strength characteristics of cement-modified soil.2)In shear tests,the maximum resistivity of cement-modified soil specimens under different moisture contents decreases with increasing normal stress,while the resistivity of the specimens increases with increasing shear displacement.The shear strength decreases with increasing failure resistivity,and failure resistivity decreases with increasing moisture content.The maximum shear strength first increases and then decreases with increasing moisture content.3)In point load tests under dry-wet cycles,the uniaxial compressive strength of specimens increases and then decreases with increasing moisture content,following a Gaussian function relationship.The resistivity of the specimens decreases with increasing moisture content,following an exponential function relationship.In unconfined compressive strength tests,the uniaxial compressive strength of the specimens increases and then decreases with increasing resistivity,following a quadratic parabolic relationship.4)In bearing ratio tests,the bearing ratio increases and then decreases with increasing moisture content of the specimens,following a Gaussian function relationship;the resistivity of the specimens generally decreases with increasing moisture content.The bearing ratio increases and then decreases with increasing resistivity of the specimens,following a quadratic parabolic function relationship.
Keywords：improved soilstress fieldresistivityCalifornia bearing ratio
Publication Date：2025-03-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：9( 93-101 )