海水侵蚀条件下水玻璃对软土的固化试验研究

Experimental study on solidification of soft soil with sodium silicate under water erosion conditions

随着社会经济快速发展的需求不断增长,尤其在沿海地区,越来越多建筑物常常处于海水侵蚀浸泡环境下。因此,探究海水侵蚀条件下建构物基础性能的变化规律对经济的发展有着重要的反推动作用。实际工程中常常在水泥土中加入水玻璃以提高其性能,现以水泥为主剂,同时加入一定掺量的水玻璃,试验结果表明水玻璃在一定范围内能提升固化土的强度,但不是呈正相关走势,存在着优掺范围。选其优掺组别及纯水泥土模拟不同工况(标准养护、蒸馏水养护、海水养护)条件下固化土无侧限抗压强度及渗透性能的变化规律,以标准养护为参照,试验结果表明蒸馏水养护对固化土力学性能的影响较小,海水对其影响较大,且随着水玻璃掺量的增加其受影响的程度越大,因此在实际工程当中应结合施工环境合理选择水玻璃的掺量。

With the increasing demand of rapid socio-economic development, especially in coastal areas, more and more buildings are often immersed in seawater erosion environment. Therefore, exploring the changing laws of construction foundation performance under seawater erosion is of great counter thrust reaction to economic develop- ment. Sodium silicate is often added to the cement soil to improve its performance in practical engineering, with ce- ment as the main agent and with addition of a certain amount of sodium silicate at the same time, the test results show that the strength of solidified soil can be increased within a certain range, but it is not a positive correlation trend, and there is an optimal addition range. With the standard curingas reference, the changing laws of unconfined com- pressive strength and permeability of solidified soil for admixture group and pure cement soil group under different conditions （standard curing, distilled water curing and seawater curing） were simulated. The test results show that the distilled water curing has little effect on the mechanical properties of solidified soil, while the seawater has great influence on the sodium silicate, and with the increase of theodium silicateadmixture, the degree of influence is grea- ter, therefore the dosage of sodium silicate should be reasonably selected in combination with the construction envi- ronment in actual engineering.