盐渍土工程性质试验

Experiment of Engineering Property of Saline Soil

为研究盐渍土的工程性质,首先通过试验测定了土样的颗粒分析结果和基本物理力学性能指标,得到了石灰物质化学性质和水泥的各项性能指标。然后分别通过对不同含盐量、不同无机结合料掺量的盐渍土土样进行低温直剪试验、抗压强度试验、抗压回弹模量试验系统研究了盐渍土的力学性能。最后分别通过对不同含盐量、不同无机结合料掺量的盐渍土土样进行干湿循环试验和冻融循环试验系统研究了盐渍土的耐久性能。研究结果表明:易溶盐含量的增加可显著降低盐渍土的抗剪强度;水泥和石灰的加入使盐渍土的粘聚力、内摩擦角、抗压强度和抗压回弹模量均显著提高,同时也使得盐渍土的耐久性有所改善;水泥对提高改良盐渍土的抵抗变形能力有显著作用,同时对早期强度与水稳性提高效果更好。

In order to research the engineering property of saline soil, first, through test the particle analysis result and the indexes of physical and mechanical properties of the soil samples, the physicochemical poperty of lime and the indexes of cement were obtained. Then, the mechanical property of the saline soil was systematically studied through direct shear test at low temperature, compressive strength test and compression resilience modulus test for the saline soil with different salt contents and different mixing amounts of inorganic binder respectively. Finally, the durability of the saline soil was systematically studied, through alternation test of wetting and drying and freeze-thaw cycle test on the samples of the saline soil with different salt contents and different mixing amounts of inorganic binder respectively. The results show that （ 1 ） the shear strength of saline soil can be decreased significantly with increasing of dissolving salt content; （2） with addition of cement and lime, cohesion, internal friction angle, compressive strength and compression resilience modulus of saline soil can be increased significantly, and the durability of saline soil can be improved ; （3） cement has remarkable effect on improving the deformation resistance of modified saline soil, and has better effect on increasing its early strength and water stability.