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连临高速路江苏段地基土层为滨海相软土,路基采用水泥土搅拌桩加固。现场取土进行室内水泥土改性试验发现,水泥土强度随水泥掺量和龄期的增加而增大。现场水泥土搅拌桩抽芯样试验发现,相同龄期条件下,水泥土室内试验强度一般要比抽芯样强度高0.2至0.8兆帕。两种实验中,该地基第一层土的水泥土强度均大于第二层土,表明土层性质对水泥土强度影响很大。受搅拌不均匀影响,芯样试验强度比较离散,随芯样夹土厚度增加,水泥土芯样波速和强度下降。
Even the temporary highway in Jiangsu section of the soil is coastal soft clay, cement-soil mixing subgrade reinforced. The site soil for indoor cement soil modification test found that cement soil strength increases with the increase of cement content and age. On-site cement-soil mixing pile core-pulling test found that under the same age conditions, the cement-soil indoor test strength is generally higher than the core-pulling strength of 0.2 to 0.8 MPa. In both experiments, the strength of cement soil in the first soil of the foundation is greater than the second soil, indicating that the soil properties have a great impact on the strength of cement soil. Affected by the uneven mixing, the strength of the core sample is relatively discrete. With the increase of the thickness of the core sample, the core-like wave velocity and strength decrease.