小剂量石灰稳定土强度特性的试验研究

Experimental Study on Strength Behaviors of Lime-Stabilized Soils with Small Lime Content

为了研究小剂量石灰稳定土的强度特性,制备了石灰剂量4%~8%、压实度90%~95%的石灰稳定土试样,经标准养护后,分别进行了7~180 d龄期的无侧限抗压强度试验和劈裂强度试验.试验结果表明：石灰稳定土的强度指标都随压实度增大而增大,且随时间增长而增大,但剂量4%的石灰稳定土的无侧限抗压强度在超过28 d后基本趋于稳定,而其他剂量石灰稳定土的强度指标至少在超过90 d后才逐渐趋于稳定.另外,对于同一压实度,当龄期较短时,小剂量石灰稳定土的强度指标有可能大于较大剂量时的对应指标值.

In order to investigate the strength behaviors of lime-stabilized soils with small lime content,the samples with 4 %～8 % lime content and 90 %～95 % degree of compaction are prepared,and then in use for the unconfined compression and split tests after they have cured in standard curing room for 7 to 180 days respectively.These test results show that the strengths of these lime-stabilized soils increase with the increase of degree of compaction and time,and the unconfined compression strength of the lime-stabilized soil with 4 % lime content increases little after 28 curing days while the strengths of the soils with other lime contents increase rapidly until 90 curing days.In addition,for a given degree of compaction,the strengths of the soil with the less lime content are potentially greater than those of the soil with the greater lime content if they curing time are shorter than 28 days.