| 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,0,():-. |
| liming,gaojinhua,zhanghao,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,0,():-. |
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| 摘要: |
| 【目的】研究新型材料固化盐渍土的工程特性，据此混合料设计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产生的溶陷冲蚀破坏、水资源浪费等问题。【方法】利用自主研发的抗冻裂型固化剂改良盐渍土，固化剂掺量设置成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，确定该参数范围下最优材料配比，在此基础上，应用Abaqus模拟分析2 m U形渠道构件在三种工况（吊点位置及吊点方式、外侧填土压力及渠内满水运行、温度变化引起冻胀）下的应力、位移状态。【结果】最优材料配比为固化剂掺量40%，初始含水率16%；28 d龄期最优配比下试件强度为14.91 MPa，经受200次以上室内冻融循环试验试件质量损失低于5%，渗透系数达到10-7 cm/s水平；2 m长度U形渠道构件采用底面受力两点吊装的方式最大主应力为87.4 KPa，最大位移0.08 mm；满水工况运行条件下最大主应力为94.32 KPa，最大位移为2.85 mm；考虑温度作用下冻胀影响最大主应力为312 KPa，最大位移为17 mm。【结论】本试验条件下，最优材料配比为固化剂掺量40%、此材料配比的U型槽结构针对不同工况在数值模拟分析中的受力及位移变形较小，稳定性好，研究结果可为吉林西部及类似地区固化盐渍土U形渠道、施工提供参考。 |
| 关键词: U形渠道；材料优化；数值模拟；固化盐渍土 |
| DOI： |
| 分类号:TV41；TV91 |
| 基金项目:吉林省科技发展计划项目(20210202010NC) |
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| Study on Material Optimization and Numerical Simulation of U-shaped Channel with Solidified Soda-Saline Soil |
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liming1, gaojinhua1, zhanghao1, sunfangcheng2, gaoyinzhe3
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1.Changchun Institute of Technology;2.Jilin Songyuan irrigation area Engineering Construction Co., Ltd;3.Jilin Baishan powerplant of Song Huajiang hydropower Co.,Ltd
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| Abstract: |
| 【Objective】Study the engineering characteristics of new material curing saline soil, design U-shaped channel components based on this mixture and optimise its structure to solve the problems of dissolution and erosion damage and water wastage arising from unlined channels in the saline soil areas of western Jilin.【Method】Improvement of saline soils using self-developed frost-crack resistant curing agents, curing agents were set at 20%, 25%, 30%, 35%, 40%, 45%,the specimens were prepared by combining 14%, 16%, 18% and 20% moisture content of saline soil material for each dose,indoor unconfined compressive strength tests, freeze-thaw tests and permeability tests were conducted to determine the optimum material ratio for this parameter range, on this basis, Abaqus simulations were applied to analyse the stress and displacement states of the 2 m U-shaped channel elements under three operating conditions (lifting point location and lifting point method, external fill pressure and full water operation in the channel, and freezing and swelling due to temperature changes).【Result】Optimum material ratio of 40% curing agent and 16% initial moisture content, the strength of the specimen was 14.91 MPa at the optimum age of 28 d. the loss of quality of specimens subjected to more than 200 indoor freeze-thaw cycles was less than 5%. permeability coefficients to the level of 10-7cm/s. Maximum principal stress of 87.4KPa and maximum displacement of 0.08 mm for a 2m length U-shaped channel member using a two-point lifting of the bottom force. A maximum principal stress of 94.32 KPa and a maximum displacement of 2.85 mm under full water operating conditions. The maximum principal stress considering the effect of frost heave under temperature was 310 KPa and the maximum displacement was 17 mm.【Conclusion】Under the present test conditions, optimum material ratio of 40% curing agent. The U-channel structure with this material ratio has low force and displacement deformation and good stability for different working conditions in the numerical simulation analysis. The results of the study can be used as a reference for curing saline soil U-shaped channels and construction in western Jilin and similar areas. |
| Key words: U-shaped channel;material optimization;numerical simulation;saline soil solidification |
