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通过劈裂抗拉试验,研究了3类固化剂固化粉土劈裂抗拉强度随龄期、固化剂种类和掺量的变化规律,分析了固化粉土劈裂破坏时的破坏形态及破坏机理。研究结果表明:3类固化剂固化粉土的劈裂抗拉强度随着龄期的增长而增加,劈裂抗拉强度与龄期具有幂函数关系;新型固化剂固化粉土的抗拉性能较另外2类固化剂固化粉土具有明显优势;随着掺量的增加,新型固化剂固化粉土的抗拉强度增加明显。在加载初期,固化粉土试样表面未有裂缝出现,随着荷载的增大,其表面开始出现裂缝;新型固化剂固化粉土劈裂裂缝最初引发时间长,开裂荷载和极限荷载的时间间隔也较长。固化粉土发生劈裂破坏时,3类固化剂固化粉土裂缝开展的宽度和深度不一,劈裂破坏形式不同。石灰-粉煤灰、石灰-粉煤灰-水泥固化粉土试样破坏为脆性破坏,新型固化剂固化粉土试样破坏时并非人们所认为的拉伸破坏。
The splitting tensile test was used to study the variation of splitting tensile strength of three types of hardeners cured silt with age, type and content of hardener. The failure mode and failure mechanism of hardened silt splitting failure were analyzed. . The results show that the splitting tensile strength of three types of hardener cured silt increases with age, and the splitting tensile strength has a power function relationship with age. The hardenability of the new hardener curing silty soil The other two kinds of curing agent cured silt has obvious advantages; with the increase of the content, the new curing agent cured silt increased significantly. At the initial stage of loading, no cracks appeared on the surface of the cured silt sample, cracks began to appear on the surface of the sample as the load increased. The fracturing cracks caused by the new curing agent silt initially started for a long time, and the time interval between cracking load and ultimate load It is also longer. Curing silt splitting failure, the three types of hardener curing silt cracks carried out the width and depth of different splitting failure in different forms. Lime - fly ash, lime - fly ash - cement-cured silt sample damage to brittle failure, the new curing agent curing silt sample damage is not what people think of the tensile damage.