软岩改良土无侧限抗压强度试验研究

Indoor Experimental Research on the Unconfined Compressive Strength of Modified Soft Soil

研究目的:无侧限抗压强度是评价改良土性能的一个关键性指标,本文对水泥改良和石灰改良的风化泥质板岩的无侧限抗压强度进行试验研究。通过试验揭示石灰改良土存在最佳掺合量的基本规律;并对水泥改良土不同的养生条件、龄期、压实度等因素对无侧限抗压强度的影响进行一系列对比分析,验证在相同压实度条件下,水泥改良土的无侧限抗压强度优于石灰改良土的无侧限抗压强度。研究结论:通过试验研究得出:水泥改良土的无侧限抗压强度随着水泥掺合量增大而增大,因水泥改良土不存在最佳水泥掺合量;用水泥来稳定软岩这种加固方法具有非常好的水稳定性,相同压实度条件下的水泥改良土无侧限抗压强度并非在最优含水率时达到最大;因此在改良土地填筑过程中要进行养护。

Research purposes： Unconfined compressive strength is the key index for evaluating the performance of modified soil. In this paper, the comparison of unconfined compressive strengths of cement modified rock and lime modified rock are studied, the basic law of blend ratio for lime modified soil is revealed by doing experiment, and the influences of maintenance condition, age and compactness on the unconfined compressive strength are analyzed. The results show that under the condition of equal compactness, the unconfined compressive strength of cement modified soft rock is better than lime modified soft rock. Research conclusions：It is concluded from the experiment that as there is no optimal blending ratio, the unconfined compressive strength of cement modified soft soil increases with the increase of blending amount of cement, the cement modified soft rock has good property of water stability and the unconfined compressive strength can not reach at the max value at the optimal water content under the condition of equal compactness, and the maintenance is needed in the process of filling modified soil.