水泥改性昔格达膨胀黏土岩试验研究

杨小奇; 徐佩依; 杨颋; 王昌明

doi:10.20265/j.cnki.issn.1007-2993.2024-0106

水泥改性昔格达膨胀黏土岩试验研究

doi: 10.20265/j.cnki.issn.1007-2993.2024-0106

四川水发勘测设计研究有限公司，四川成都　610072

基金项目: 水利部172项节水供水重大水利工程；四川省凉山州盐源县龙塘水库及灌区工程项目（SCD41059-SG）

详细信息

作者简介:
杨小奇，男，1990年生，硕士，高级工程师，注册土木工程师（岩土），主要从事岩土试验特性研究工作。E-mail：swhiyxq@163.com

通讯作者:
徐佩依，女，1997年生，硕士，助理工程师，主要从事岩土试验特性研究工作。E-mail：15680905190@163.com

中图分类号: TU45
计量
- 文章访问数: 19
- HTML全文浏览量: 5
- PDF下载量: 5
- 被引次数: 0
出版历程
- 收稿日期: 2024-03-07
- 修回日期: 2024-05-09
- 录用日期: 2024-08-29
- 刊出日期: 2025-06-09

Experimental study of Xigeda expanded claystone improved by cement

Sichuan Water Development Investigation, Design & Research Co., Ltd., Chengdu 610072, Sichuan, China

摘要

摘要: 以龙塘水库及灌区工程沿线分布的昔格达膨胀黏土岩为研究对象，对不同水泥占比的改性昔格达膨胀黏土岩进行了基本物理性试验、EDTA滴定试验、击实试验、电镜扫描、压缩试验及直剪试验等。试验研究结果表明：掺入水泥能够有效改善昔格达膨胀黏土岩的工程特性，降低膨胀黏土岩的膨胀性，随着水泥含量的增加，改性黏土岩的塑性性能、击实性能、压缩性能和抗剪强度都有了较大提升；通过对水泥改性昔格达膨胀黏土岩的微观结构分析可知，掺入水泥使改性黏土岩颗粒间分布着大量的杆状或絮状胶凝物质，与膨胀黏土岩颗粒相互嵌入，形成一个整体，从而提高颗粒间的连接强度；不同含水状态的水泥改性膨胀黏土岩进行收缩和侧限抗压强度试验，结果显示未饱和状态下的改性土无侧限抗压强度明显高于饱和状态，最后得到水泥的合理掺量为8%。
- 昔格达膨胀黏土岩 /
- 水泥改性 /
- 物理力学试验 /
- 合理掺量
Abstract: Based on the study of Xigeda expanded claystone distributed along the Longtang Reservoir and Irrigation District Project, the basic physical properties test, EDTA titration method, percussion test, scanning electron microscopy, compression test, and straight shear test on modified Xigeda expanded claystone with different cement contents were carried out. The results show that the admixture of cement can effectively improve the engineering properties of Xigeda expanded claystone, and reduce the expansion of expanded claystone, and with the increase of cement content, the mechanical properties of modified claystone have been greatly improved. Microstructural analysis of modified Xigeda expanded claystone revealed that cement makes a large number of rods or flocculent gelling substances distributed between the claystone particles, which are embedded in each other and the expanded claystone particles to form a single whole, thus improving the strength of the connection between the soil particles. Unsaturated and saturated state of cement-modified expanded claystone for shrinkage test and unconfined compressive strength test, it can be seen that the unconfined compressive strength of unsaturated modified soil is significantly higher than the saturated state, and the reasonable admixture content of cement is 8%.
- Xigeda expanded claystone /
- cement modification /
- physical and mechanical experiment /
- reasonable admixture

HTML全文

图 1 不同埋深下的昔格达膨胀黏土岩裂隙发育照片

下载: 全尺寸图片幻灯片

图 2 昔格达膨胀黏土岩物理性质与水泥掺量的关系

下载: 全尺寸图片幻灯片

图 3 EDTA二钠溶液消耗量随时间衰减曲线图

下载: 全尺寸图片幻灯片

图 4 水泥掺入含量变化对最优含水率和最大干密度的影响

下载: 全尺寸图片幻灯片

图 5 昔格达膨胀黏土岩掺入水泥改性前后的电镜扫描照片

下载: 全尺寸图片幻灯片

图 6 不同直剪试验方法下的水泥掺入含量变化对抗剪强度参数的影响

下载: 全尺寸图片幻灯片

图 7 不同饱和状态下的水泥掺入含量与收缩指标的关系曲线

下载: 全尺寸图片幻灯片

表 1 昔格达膨胀黏土岩改性前后的基本物理性质试验结果

水泥掺入含量/%	比重	界限含水率试验					自由膨胀率/%	黏粒含量/%
水泥掺入含量/%	比重	w_L /%	w_P/%	I_P	w₁₀ /%	I₁₀	自由膨胀率/%	黏粒含量/%
0	2.79	49.1	21.8	27.3	40.1	18.3	50	53.4
4	2.86	62.4	34.5	27.9	53.9	19.4	49	30.4
6	2.85	52.4	33.2	19.2	46.8	13.6	32	30.1
8	2.86	45.9	28.8	17.1	40.9	12.1	28	29.7
10	2.85	40.4	26.0	14.4	36.3	10.3	24	16.2

下载: 导出CSV

表 2 昔格达膨胀黏土岩改性前后的击实试验结果

水泥掺入含量/%	最优含水率/%	最大干密度/(g·cm⁻³)
0	21.4	1.59
4	21.3	1.60
6	21.0	1.62
8	19.9	1.66
10	20.5	1.65

下载: 导出CSV

表 3 昔格达膨胀黏土岩改性前后的固结压缩和直接剪切试验结果

水泥掺量 /%	压缩系数 /(MPa⁻¹）	压缩模量 /MPa	抗剪强度参数
			天然快剪		饱和快剪		饱和固结快剪		饱和慢剪
			c/kPa	φ/(°)	c/kPa	φ/(°)	c/kPa	φ/(°)	c/kPa	φ/(°)
0	0.406	4.3	17.0	17.3	18.0	11.7	27.5	17.6	32.0	20.3
6	0.102	17.6	92.5	30.4	98.5	24.4	110.0	29.1	109.5	31.5
8	0.058	31.0	142.5	33.5	72.0	30.5	122.5	36.8	120.5	38.3

下载: 导出CSV

表 4 改性前后的收缩和无侧限抗压强度试验结果

水泥掺入含量/%	状态	体缩率/%	缩限	收缩系数	无侧限抗压强度 /kPa
0	未饱和	5.28	16.5	0.28	36.0
0	饱和	4.96	14.8	0.24	20.0
6	未饱和	2.42	10.4	0.04	198.0
6	饱和	2.90	14.0	0.15	42.5
8	未饱和	1.93	12.8	0.13	202.0
8	饱和	1.77	11.7	0.13	57.2

下载: 导出CSV

参考文献(16)

[1]	周罕, 曹平, 张科. 昔格达组黏土岩和粉砂岩现场直剪试验研究[J]. 中南大学学报(自然科学版),2014,45(10):3544-3550. (ZHOU H, CAO P, ZHANG K. In-situ direct shear test on Xigeda Formation clay stone and siltstone[J]. Journal of Central South University (Science and Technology),2014,45(10):3544-3550. (in Chinese) ZHOU H, CAO P, ZHANG K. In-situ direct shear test on Xigeda Formation clay stone and siltstone[J]. Journal of Central South University (Science and Technology), 2014, 45（10）: 3544-3550.
[2]	王维早, 许强. 昔格达土路基填料压实度影响因素的试验研究[J]. 重庆交通大学学报(自然科学版),2010,29(6):934-937,991. (WANG W Z, XU Q. Experimental study of influence factors of the compaction degree of Xigeda roadbed filling[J]. Journal of Chongqing Jiaotong University (Natural Sciences),2010,29(6):934-937,991. (in Chinese) WANG W Z, XU Q. Experimental study of influence factors of the compaction degree of Xigeda roadbed filling[J]. Journal of Chongqing Jiaotong University (Natural Sciences), 2010, 29（6）: 934-937,991.
[3]	卢志鹏, 孔玉侠, 王慧娟, 等. 昔格达土的压缩特性和微观结构[J]. 南京工业大学学报(自然科学版), 2022, 44(1): 114-122. (LU Z P, KONG Y X, WANG H J, et al. Compressive characteristics and microstructure of Xigeda soil[J]. Journal of Nanjing Tech University (Natural Science Edition), 2022, 44(1): 114-122. (in Chinese) LU Z P, KONG Y X, WANG H J, et al. Compressive characteristics and microstructure of Xigeda soil[J]. Journal of Nanjing Tech University (Natural Science Edition), 2022, 44(1): 114-122. (in Chinese)
[4]	左永振, 张伟, 张晓川, 等. 昔格达组粉砂岩作为筑坝土料的工程特性研究[J]. 长江科学院院报,2016,33(3):84-88. (ZUO Y Z, ZHANG W, ZHANG X C, et al. Engineering properties of Xigeda strata siltstone as the filling material of earth-rock dam[J]. Journal of Yangtze River Scientific Research Institute,2016,33(3):84-88. (in Chinese) ZUO Y Z, ZHANG W, ZHANG X C, et al. Engineering properties of Xigeda strata siltstone as the filling material of earth-rock dam[J]. Journal of Yangtze River Scientific Research Institute, 2016, 33（3）: 84-88.
[5]	向贵府, 任光明, 聂德新, 等. 昔格达土混合填料最优含水量研究[J]. 中国地质灾害与防治学报,2004,15(2):48-52. (XIANG G F, REN G M, NIE D X, et al. Study on optimal moisture content in mixed filling of Xi-ge-da strata[J]. The Chinese Journal of Geological Hazard and Control,2004,15(2):48-52. (in Chinese) XIANG G F, REN G M, NIE D X, et al. Study on optimal moisture content in mixed filling of Xi-ge-da strata[J]. The Chinese Journal of Geological Hazard and Control, 2004, 15（2）: 48-52.
[6]	周洪福, 聂德新, 钟华介. 昔格达土用作高速公路路基填料的工艺试验[J]. 成都理工大学学报(自然科学版),2013,40(1):59-65. (ZHOU H F, NIE D X, ZHONG H J. Technique experiment using Xigeda stratum as expressway subgrade materials[J]. Journal of Chengdu University of Technology (Science & Technology Edition),2013,40(1):59-65. (in Chinese) ZHOU H F, NIE D X, ZHONG H J. Technique experiment using Xigeda stratum as expressway subgrade materials[J]. Journal of Chengdu University of Technology (Science & Technology Edition), 2013, 40（1）: 59-65.
[7]	徐社辉. 改良膨胀土在合蚌高铁路基填料中的应用[J]. 岩土工程技术,2015,29(4):197-200. (XU S H. Application of improved expansive soil in the Hebeng high-speed rail roadbed filling[J]. Geotechnical Engineering Technique,2015,29(4):197-200. (in Chinese) XU S H. Application of improved expansive soil in the Hebeng high-speed rail roadbed filling[J]. Geotechnical Engineering Technique, 2015, 29（4）: 197-200.
[8]	马英洁, 张凌凯, 张浩. 干湿循环条件下膨胀土膨胀特性试验研究[J]. 岩土工程技术,2023,37(6):708-712. (MA Y J, ZHANG L K, ZHANG H. Study on expansion characteristics of expansive soil under dry-wet cycle conditions[J]. Geotechnical Engineering Technique,2023,37(6):708-712. (in Chinese) MA Y J, ZHANG L K, ZHANG H. Study on expansion characteristics of expansive soil under dry-wet cycle conditions[J]. Geotechnical Engineering Technique, 2023, 37（6）: 708-712.
[9]	陈伟, 罗强, 孙金坤, 等. 攀西地区昔格达土农房墙体材料改性技术研究[J]. 四川建筑科学研究,2010,36(3):201-204. (CHEN W, LUO Q, SUN J K, et al. Study on the improvement technology of peasant house wall material of Xi-Geda soil in Panzhihua west area[J]. Sichuan Building Science,2010,36(3):201-204. (in Chinese) CHEN W, LUO Q, SUN J K, et al. Study on the improvement technology of peasant house wall material of Xi-Geda soil in Panzhihua west area[J]. Sichuan Building Science, 2010, 36（3）: 201-204.
[10]	阮小龙. 高填方边坡昔格达土改性及加筋机理研究[D]. 成都: 西华大学, 2013. (RUAN X L. Research on modification and reinforcement mechanism of Xigeda-soil in high fill slope[J]. Chengdu: Xihua University, 2013. (in Chinese) RUAN X L. Research on modification and reinforcement mechanism of Xigeda-soil in high fill slope[J]. Chengdu: Xihua University, 2013. (in Chinese)
[11]	唐紫琼, 陈加富, 侯爵, 等. 粉土改良膨胀土工程特性试验研究[J]. 地基处理,2023,5(2):113-120. (TANG Z Q, CHEN J F, HOU J, et al. Experimental study on engineering characteristics of modified expansive soil with silt[J]. Journal of Ground Improvement,2023,5(2):113-120. (in Chinese) TANG Z Q, CHEN J F, HOU J, et al. Experimental study on engineering characteristics of modified expansive soil with silt[J]. Journal of Ground Improvement, 2023, 5（2）: 113-120.
[12]	李东森, 夏熙临, 陈丛丛, 等. 石灰、水泥及砂改性膨胀土工程特性的试验研究[J]. 南水北调与水利科技,2011,9(4):25-27,46. (LI D S, XIA X L, CHEN C C, et al. Experimental study on engineering characteristics of expansive soils modified with lime, cement and sand[J]. South-to-North Water Transfers and Water Science & Technology,2011,9(4):25-27,46. (in Chinese) LI D S, XIA X L, CHEN C C, et al. Experimental study on engineering characteristics of expansive soils modified with lime, cement and sand[J]. South-to-North Water Transfers and Water Science & Technology, 2011, 9（4）: 25-27,46.
[13]	阮小龙, 黄双华, 罗强. 不同石灰配合比对昔格达土性能的影响试验研究[J]. 西华大学学报(自然科学版),2014,33(1):99-103. (RUAN X L, HUANG S H, LUO Q. Study on the performance of Xigeda soil with different lime mixture ratios[J]. Journal of Xihua University (Natural Science),2014,33(1):99-103. (in Chinese) RUAN X L, HUANG S H, LUO Q. Study on the performance of Xigeda soil with different lime mixture ratios[J]. Journal of Xihua University (Natural Science), 2014, 33（1）: 99-103.
[14]	王东星, 张子伟, 王协群, 等. 干湿–冻融循环作用下水泥改性膨胀土的路用性能与微观机制[J]. 中南大学学报(自然科学版),2022,53(1):306-316. (WANG D X, ZHANG Z W, WANG X Q, et al. Performance and micromechanism of cement-modified expansive soils under the influence of freeze−thaw and dry−wet cycles[J]. Journal of Central South University (Science and Technology),2022,53(1):306-316. (in Chinese) WANG D X, ZHANG Z W, WANG X Q, et al. Performance and micromechanism of cement-modified expansive soils under the influence of freeze−thaw and dry−wet cycles[J]. Journal of Central South University (Science and Technology), 2022, 53（1）: 306-316.
[15]	段钢, 白明洲, 胡晓明. 石灰改良膨胀土力学性质的研究[J]. 岩土工程技术,2005,19(3):130-133. (DUAN G, BAI M Z, HU X M. The research on mechanical character of expansive soil improved by lime[J]. Geotechnical Engineering Technique,2005,19(3):130-133. (in Chinese) DUAN G, BAI M Z, HU X M. The research on mechanical character of expansive soil improved by lime[J]. Geotechnical Engineering Technique, 2005, 19（3）: 130-133.
[16]	孙志亮, 郭爱国, 太俊. 膨胀土与红黏土石灰改性对比试验研究[J]. 岩土力学,2013,34(S2):150-155. (SUN Z L, GUO A G, TAI J. Comparative laboratory study of lime-treated expansive soil and red clay[J]. Rock and Soil Mechanics,2013,34(S2):150-155. (in Chinese) SUN Z L, GUO A G, TAI J. Comparative laboratory study of lime-treated expansive soil and red clay[J]. Rock and Soil Mechanics, 2013, 34（S2）: 150-155.