珠江三角洲软土固化后力学特性研究

Study on Mechanical Properties of Solidified Soft Soil in Pearl River Delta

基于沿海深厚软土地基含水量高、高压缩性、低渗透性、地基承载力低的特征。通过室内固化剂配比试验,得到了一系列不同掺量条件下无侧限抗压强度、抗剪强度、压缩性指标随水灰比及龄期变化曲线,并通过统计与回归相结合的方法建立软土固化后力学性能指标与无侧限抗压强度间的回归关系。研究结果表明:固化剂可显著提高软土的力学指标,相同条件下,加入5%的石灰能够提高水泥土的无侧限抗压强度、抗剪强度、压缩性指标。相同水灰比条件下,低水灰比(W/C=0.5,1.0)时,水泥土无侧限抗压强度、抗剪强度、压缩性指标随固化剂掺量的增加而增加得较为明显,高水灰比(W/C=1.5,2.0)时,这种增加趋势相对较弱。

It is based on the characteristics of high water content,high compressibility,low permeability and low bearing capacity of deep soft soil foundation along the coast.A series of curves of unconfined compressive strength,shear strength and compressibility indexes with water-cement ratio and age were obtained by laboratory experiments of curing agent ratio.The regression relationship between mechanical properties and unconfined compressive strength of soft soil after curing was established by combining statistics and regression methods.The results show that the curing agent can significantly improve the mechanical properties of soft soil,and the addition of 5%lime can improve the unconfined compressive strength,shear strength and compressibility of soil-based soil under the same conditions.Under the same water-cement ratio,the unconfined compressive strength,shear strength and compressibility of soil-cement increase obviously with the increase of the content of curing agent at low water-cement ratio(W/C=0.5 and 1.0),while the increase trend is relatively weak at high watercement ratio(W/C=1.5 and 2.0).