厦门地区含盐地层冻土力学性能试验研究

在海底地层中进行冻结法施工时，海水浸渍使地层中的含盐量增加，从而影响到形成冻土帷幕的物理力学性质。为了获得海底含盐地层的冻土物理力学参数，针对厦门地区地铁建设中涉及的含盐地层，从施工现场采集了原装土样，在试验室中完成了原状土及重塑土冻结后的物理力学参数测试，获得了不同地层的单轴抗压强度值。试验结果表明，重塑土样和原状土样的试验过程具有较好的一致性，获得的应力-应变曲线和强度值相差不大。同时，砂性土具有较高的强度和较大的弹性模量，而黏性土的单轴抗压强度相对较低，并呈现出明显的峰值现象。

Experimental Study on Mechanical Properties of Salt-bearing Frozen Soil in Xiamen,China

The effect of seawater soakage will increase the salt content of undersea strata and affect the mechanical properties of frozen soil curtain. To acquire the physical and mechanical parameters of frozen soil of salt bearing strata, some tests are made on the intact salt bearing soil samples collected from undersea tunnel of Haicangdadao Station Dongdulu Station section in Xiamen and remoulded soil samples, and the uniaxial compressive strength of frozen soils are gained. The test results show that: 1) The properties of remoulded soil samples and that of intact soil samples are almost the same. The stress strain curves and strength of remoulded soil samples and that of intact soil samples are almost the same. 2) The sandy soil has large strength and elastic modulus, and the cohesive soil has small uniaxial compressive strength and shows obvious peak value.