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沙漠风积沙地基结构松散、稳定性差、承载力低,利用水泥作为固化剂固化稳定风积沙,形成水泥固化风积沙地基是改善其不良工程特性的有效手段。本文将取自内蒙古库布齐沙漠的现场风积沙重塑为3%含水率的试验用风积沙,向其中掺入6%普通硅酸盐水泥经充分拌和形成水泥固化风积沙填料,完成了水泥固化风积沙地基中9个扩展基础模型抗拔试验。结果表明,风积沙水泥固化方法可显著提高风积沙抗拔承载性能。上拔荷载作用下,当水泥固化风积沙扩展基础抗拔深度与底板边长比值小于3.5时,其荷载~位移曲线呈2阶段变化:初始弹性段至峰值荷载、峰值荷载后破坏段,极限抗拔承载力对应的位移与底板边长比值变化范围为0.04%~1.05%,平均0.54%。按“土重法”确定的水泥固化风积沙“上拔角”远大于天然风积沙。
The sandy aeolian sand foundation has loose structure, poor stability and low bearing capacity. It is an effective way to improve the bad engineering characteristics by using cement as curing agent to stabilize aeolian sand. In this paper, the wind-blown sand from the Kubuqi desert in Inner Mongolia was remodeled into 3% moisture content of experimental aeolian sand, and 6% of ordinary portland cement was blended into it to form cement- Completion of the cement-cured wind-blown sand foundation 9 extended base model pull-up test. The results show that the aeolian sand cement curing method can significantly improve the anti-pull bearing capacity of aeolian sand. Under the action of uplift load, the load-displacement curve of the cement-cured aeolian sand expanded base pull-out depth and the length of the bottom side is less than 3.5, the change of the load-displacement curve is in two stages: initial elastic section to peak load, peak section after failure, The ratio of the displacement corresponding to the pull-out bearing capacity to the length of the floor edge varies from 0.04% to 1.05% with an average of 0.54%. According to “soil heavy method” to determine the cement-cured aeolian sand “pull-angle” is much larger than the natural aeolian sand.