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采用室内颗粒分析试验、界限含水量(质量分数)试验、击实试验、强度特性试验、变形特性试验和溶胀试验分析了板块状盐渍土工程特性。分析结果表明:板块状盐渍土主要由砾类土构成,其级配因取土样位置而差异较大;塑性指数范围、最大干密度范围与最佳含水量范围分别为0.57~3.20、2.22~2.25 g.cm-3与5.7%~6.2%;天然状态下的无侧限抗压强度最大值为28.6 MPa,具有岩石的特性,属于盐岩;板块状盐渍土为低压缩性土,满足高速公路地基变形指标要求;在水、热环境的变化下,随着板块状盐渍土含盐量的增大,溶陷系数与盐胀力(量)增大,盐胀起胀温度随着硫酸钠含量的增加有较大幅度的提前;盐渍土地区公路交通荷载可抑制其盐胀,从而可以降低盐胀对工程产生的病害。
The engineering characteristics of plate-like saline soils were analyzed by the indoor particle analysis test, the limit water content (mass fraction) test, the compaction test, the strength characteristic test, the deformation characteristic test and the swelling test. The results show that the plate-shaped saline soil is mainly composed of gravelly soil, and its gradation is quite different due to the location of soil samples. The plastic index range, the maximum dry density range and the optimal water content range from 0.57 to 3.20 and 2.22 ~ 2.25 g · cm-3 and 5.7% ~ 6.2% respectively. The maximum unconfined compressive strength under natural conditions is 28.6 MPa, which is rock-like and belongs to salt rock. The plate-like saline soil is low compressive soil, Under the change of water and thermal environment, with the increase of salinity of plate-shaped saline soils, the coefficient of dissolution and the amount of salt stress (amount) increase, and the temperature of salt expansion and expansion The content of sodium sulfate increased significantly ahead of schedule; saline soil area road traffic load can inhibit the salt bulge, which can reduce the disease caused by salt bulge on the project.