PS对潮湿环境土遗址加固潜力探讨

PS在我国西北干旱地区土遗址加固工程中得到运用,其加固效果也取得了广泛的认可。但PS能否用于潮湿环境土遗址的加固保护及其潜力如何,目前尚没有比较成熟的成果。本文旨在回答上述两个重要问题。在室内将遗址土重塑成样并控制其含水量为13%、17%、19%、21%和25%。随后用3%PS渗透加固各含水量试样,通过固结和直剪试验结果的对比,得到以下结论：（1）不同含水量试样,渗透速度差别较大,PS吸收量差别也较大,但呈现一定的规律性：含水量越大,初始出渗时间和PS的吸收量越小;（2）加固后,土样的压缩系数和抗剪强度均有所提高,证明PS对潮湿地区的土遗址具有加固效果;（3）含水量不同加固效果也不同,其中加固效果最好的含水量在19%～21%。上述结论和成果为PS在潮湿地区土遗址的保护提供了一定的数据支持。

Potassium Silicate Potential for Earthen Relics Protection in Moist Areas

Potassium silicate（PS） is applied in the earthen relics reinforcement project of northwest arid areas,with wide acceptance.But no significant evidences prove whether PS can protect the earthen relics in moist areas and its potential.In laboratory,specimens are made by compaction and the water contents controlled at 13%,17%,19%,21% and 25%.Then,3%PS is infiltrated into specimens with different water content to reinforce them.After direct shear and consolidation test,conclusions are found：（1）Pervious infiltration velocity and quality of PS infiltration are different from different water content,some regularity：pervious infiltration velocity and quality of PS infiltration decrease as water content increases;（2） PS has some certain reinforcement effect on earthen relics in moist,proved by the increased resistance ability against compression and shear strength after reinforcement;（3） Although protection effect of PS varies with gravimetric water content,the optimum locates between 19% and 21%.These test results and conclusions provide some data support for the protection practice on earthen relics with PS in moist areas.