海砂–海泥混合料作为海堤填料的可行性试验研究

提出海砂–海泥混合料作为海堤填筑材料。通过室内试验对不同掺合比的海砂海泥混合料的土体强度参数、压缩性能以及渗透性能进行对比分析,结果表示海砂–海泥按质量比1.5∶1掺合时,混合料的物理力学性质指标最接近工程要求。为改善混合料工程性质,采用水泥作为固化剂,通过一系列室内试验对掺合比1.5∶1的固化混合物的强度特性、压缩特性、渗透特性进行研究。结果表明:随着水泥掺量和龄期的增加,固化混合料的无侧限抗压强度、抗剪强度均有很大提高;存在7 d的早期强度;应力应变曲线在水泥掺量为8%与10%时具有有明显的峰值,且脆性破坏特征明显;渗透系数大幅度降低;水泥掺量为6%时,28 d龄期固化混合料便属于低压缩性土范畴。

Experimental study on feasibility of sea sand-mud mixture used as seawall filler

The sea sand-mud mixture used as filling material is proposed. The strength parameters and compression performance and permeability of soils are compared and analyzed through laboratory tests with different blending ratios of the mixed soils. The results indicate that when the sea sand-mud is blended with mass ratio of 1.5: 1, its physical and mechanical properties are the closest to the engineering requirements. In order to improve the engineering properties of the mixture, cement is considered. A series of laboratory tests are performed to study the unconfined compressive strength, shear strength of solidified mixture. It is indcicated that with the increase of cement content, the unconfined compressive strength and shear strength of of solidified mixture are significantly improved, and there exists 7 d early strength. There is a peak value in the stress-strain curves of soils stabilized by cement with the cement content of 8% and 10%, and there is significant brittle fracture. The permeability coefficient has a significant reduction. Under the cement content of 6%, 28 d age solidified mixture belongs to the low-compression soils.