| 引用本文: | 李 明,高金花,张 浩,等.盐渍土固化U形渠道材料优化和数值模拟研究[J].灌溉排水学报,2023,42(8):121-126. |
| LI Ming,GAO Jinhua,ZHANG Hao,et al.盐渍土固化U形渠道材料优化和数值模拟研究[J].灌溉排水学报,2023,42(8):121-126. |
|
| 摘要: |
| 【目的】研究新型材料固化盐渍土的工程特性，设计U形槽构件并对其进行结构优化，解决吉林西部盐渍土地区无衬砌渠道的溶陷冲蚀破坏问题。【方法】利用自主研发的抗冻裂型固化剂对盐渍土进行改良，固化剂掺量设置为20%、25%、30%、35%、40%、45%，每一掺量结合含水率分别为14%、16%、18%、20%的盐渍土料制备试样，通过室内无侧限抗压强度试验、冻融试验、渗透试验确定最优材料配比。在此基础上，应用ABAQUS模拟分析2 m的U形渠道构件在3种工况下的应力和位移状态。【结果】最优材料配比为固化剂掺量40%、盐渍土初始含水率16%；28 d龄期最优配比下的试件强度为14.91 MPa，经受200次以上室内冻融循环后，试件质量损失低于5%，渗透系数达到1×10-7 cm/s；2 m长度U形渠道构件在底面受力2点吊装方式下的最大主应力为87.4 kPa，最大位移为0.08 mm；满水工况运行条件下的最大主应力为94.32 kPa，最大位移为2.85 mm；考虑温度作用下冻胀影响的最大主应力为312 kPa，最大位移为17 mm。【结论】固化剂掺量为40%、盐渍土初始含水率为16%的材料配比的U型槽结构在不同工况条件下的数值模拟分析中受力及位移变形较小，稳定性较好。 |
| 关键词: 盐渍土固化；U形渠道；材料优化；数值模拟 |
| DOI：10.13522/j.cnki.ggps.2022400 |
| 分类号: |
| 基金项目: |
|
| Optimizing the Materials for U-shaped Channel in Solidified Soda-saline Soils |
|
LI Ming, GAO Jinhua, ZHANG Hao, SUN Fangcheng, GAO Yinzhe
|
|
1. Changchun Institute of Technology College of Water Conservancy and Environmental Engineering, Changchun 130012, China;
2. Jilin Province Water Engineering Safety and Disaster Prevention Engineering Laboratory, Changchun 130012, China;
3. Jilin Songyuan irrigation area Engineering Construction Co., Ltd., Songyuan 138000, China;
4. Jilin Baishan powerplant of Song Huajiang hydropower Co., Ltd., Huadian 132403, China
|
| Abstract: |
| 【Objective】Saline soil needs reinforcement in constructing channels. The objective of this paper is to investigate the engineering characteristics of a new material used to reinforce saline soil to resolve issues such as dissolution, erosion and water wastage in west Jilin province. 【Method】A house-made frost-crack resistant agent was used in the study. It was mixed with the soil at ratios ranging from 20% to 45%, with soil water content varying from 14% to 20%. The hydraulic and mechanical properties of each sample were measured using unconfined compressive strength test, freeze-thaw test, and permeability test, from which we determined the optimal mixing ratio. The ABAQUS software was then used to analyze the stress and displacement of a 2 m U-shaped channel under different operating conditions. 【Result】The optimal material ratio was 40% with the soil moisture being 16%. Its strength was 14.91 MPa at the optimal age of 28 days. The specimens lost less than 5% of its quality after undergoing more than 200 indoor freeze-thaw cycles; its hydraulic conductivity was 1×10-7 cm/s. The numerical simulations revealed that the 2 m U-shaped channel experienced a maximum principal stress of 87.4 kPa and maximum displacement of 0.08 mm under a two-point lifting of the bottom force. Under full water operating conditions, the maximum principal stress was 94.32 kPa, and the maximum displacement was 2.85 mm. Considering the effect of frost heave, the maximum principal stress was 312 kPa, and the maximum displacement was 17 mm. 【Conclusion】Under the test conditions, the optimal agent ratio was 40%. This ratio reduced the displacement deformation of the U-shaped channel and improved its stability. These findings provide guidance for constructing U-shaped channels in saline soils in western Jilin province and regions with similar environments. |
| Key words: saline soil solidification; U-shaped channel; material optimization; numerical simulation |
