水泥固化土固化机理及抗冲刷特性  

Curing Mechanism and Erosion Resistance of Cement-solidified Soil

作　　者：王秋生[1] 修一兵 齐云鹏 邓启华 李广耀 WANG Qiu-sheng;XIU Yi-bing;QI Yun-peng;DENG Qi-hua;LI Guang-yao(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;China Railway 22nd Bureau Group Co.,Ltd.,Beijing 100043,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]中铁二十二局集团有限公司,北京100043

出　　处：《长江科学院院报》2024年第8期142-149,共8页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(51679003,52130905)。

摘　　要：为了完善水泥固化土抗冲刷性能方面的研究,使水泥固化土在水下结构防护中得到应用,在砂土和黏土中分别掺入水泥和与液体固化剂,采用土体冲刷函数测定仪(EFA)对水泥固化土开展了抗冲刷性能试验。在分析砂土和黏土的固化作用机理基础上,研究了固化剂和固化时间对水泥固化土抗冲刷性能的影响。研究结果表明:水泥固化土的强度随固化时间的增长而增大,黏土的强度快速增长阶段要早于砂土;固化剂可以有效提高土体的起动切应力,同时可以大幅减小土体的冲刷速率,明显提高了土体的抗冲刷强度;起动切应力的增长速率随固化时间增长逐渐减缓,存在临界最大值。根据起动切应力的变化特征提出了水泥固化土起动切应力预测模型,经试验数据对比,该模型可以较好地预测水泥固化土的起动切应力随固化时间的变化规律。To enhance the erosion resistance of cement-solidified soil and facilitate its application in underwater structural protection,an investigation was conducted into the erosion resistance of cement-solidified soil through the addition of cement and a liquid curing agent to sand and clay.Erosion resistance tests were performed using the erosion function apparatus(EFA).The curing mechanisms was analyzed and the impact of curing agent and curing duration on the erosion resistance of cement-solidified soil was examined.The findings indicated that the strength of cement-solidified soil increased with longer curing times,with clay reaching its rapid strength development stage earlier than sand.Curing agent notably augmented the critical shear stress of the soil and significantly reduced erosion rates,thereby enhancing erosion resistance.Moreover,the rate of increase in critical shear stress gradually diminished with longer curing times until reaching a critical maximum value.Based on the observed variations in critical shear stress,a predictive model for the critical shear stress of cement-solidified soil was proposed.Experimental data comparisons validated the efficacy of the model in predicting critical shear stress variations with curing time.

关 键 词：水泥固化土 固化时间 固化剂 固化机理 抗冲刷 起动切应力 

分 类 号：TU442[建筑科学—岩土工程]