石灰改良崩岗岩土体无侧限抗压强度研究

Study on the Unconfined Compressive Strength of Rock Soil in the Collapsing Areas Improved by the Lime

通过开展一系列室内无侧限抗压强度试验,研究崩岗不同层次岩土体在石灰改良作用下无侧限抗压强度的变化规律。结果表明:采用响应面设计优化得出掺灰率、龄期、含水率三者最佳配比组合,表土层:掺灰率8.99%、龄期28 d、含水率25%;红土层:掺灰率8.98%、龄期28 d、含水率25%;斑纹层:掺灰率5.84%、龄期18 d、含水率20%;碎屑层:掺灰率6.58%、龄期28 d、含水率23%。该结果对在崩岗区岩土体进行石灰改良,提高崩岗岩土体强度和稳定性具有一定的指导和实践意义。

Through the series of indoor unconfined compressive strength experiments, it was studied the change rules of unconfined compressive strength of the rock soils at different levels in the collapsing areas after the improvement of lime. The results show that, by adopting the response surface design optimization, the ash mixing rate, age and mois- ture content have reached the best ratio proportion. The percentages of the ash mixing rate, age and moisture content in the topsoil layer is 8.99%, 28d and 25% respectively, in the red soil layer is 8.98%, 28d and 25% respectively, in the variegated layer is 5.84%, 18d and 20% respectively, and in the elastic layer is 6.58%, 28d and 23% re- spectively. The result has the guiding and practicing meaning to the use of lime in the improvement of rock soil in the collausin- areas so as to increase the strenath and stabilitv of the rock soil.