新近吹填淤泥地基真空固结失效原因分析及对策

鲍树峰; 娄炎; 董志良; 莫海鸿; 陈平山; 周睿博

doi:10.11779/CJGE201407020

新近吹填淤泥地基真空固结失效原因分析及对策 English Version

鲍树峰^{1, 2, 3},
娄炎^{2, 3, 4},
董志良^{2, 3},
莫海鸿¹,
陈平山^{2, 3},
周睿博^{2, 3}

1. 华南理工大学土木与交通学院,广东广州 510641; 2.中交四航工程研究院有限公司,广东广州 510230; 3. 中交集团交通基础工程环保与安全重点实验室,广东广州 510230; 4. 南京水利科学研究院,江苏南京 210029

详细信息

作者简介:
鲍树峰(1982- ),男,江西婺源人,博士研究生,工程师,主要从事软基处理、桩基工程、以及基坑工程等方面的研究工作。E-mail: bshufeng@gzpcc.com。

计量
- 文章访问数: 464
- HTML全文浏览量: 8
- PDF下载量: 610
出版历程
- 收稿日期: 2013-11-11
- 发布日期: 2014-07-24

Causes and countermeasures for vacuum consolidation failure of newly-dredged mud foundation

BAO Shu-feng^{1, 2, 3},
LOU Yan^{2, 3, 4},
DONG Zhi-liang^{2, 3},
MO Hai-hong¹,
CHEN Ping-shan^{2, 3},
ZHOU Rui-bo^{2, 3}

1. School of Civil Engineering &Transportation, South China University of Technology, Guangzhou 510641, China; 2. CCCC Fourth Harbor Engineering Institute Co., Ltd., Guangzhou 510230, China; 3. CCCC Key Lab of Environmental Protection & Safety in Foundation Engineering of Transportation, Guangzhou 510230, China; 4. Nanjing Hydraulic Research Institute, Nanjing 210029, China

摘要

摘要: 新近吹填淤泥地基经无砂垫层真空预压技术加固后,土体强度增长有限,地基有效加固深度小,地基承载力仍然较低。为了深入分析新近吹填淤泥地基真空固结失效原因,首先对不同地区新近吹填淤泥的工程特性进行了系统地研究,然后采用3种典型的竖向排水体进行了室内真空固结单井模型对比试验研究,研究结果表明：①新近吹填淤泥中黏粒含量（d0.005 mm）过高、竖向排水体反滤层的等效孔径过小、真空加载速度过快是竖向排水体出现较严重淤堵现象的主要原因;②排水系统内的真空度局部损失较大,竖向排水体弯曲程度大和水平排水垫层中真空度传递阻力大均致使较大的真空度沿程损失;③土体中强亲水矿物含量较高、排水体中出现严重的淤堵现象和过大的真空度损失等共同降低了排水系统的排水效率,削弱了土体中的真空压力作用,最终致使土体的加固效果不理想。最后,有针对性地提出了相应的解决对策。
- 新近吹填淤泥地基 /
- 单井模型试验 /
- 室内真空固结 /
- 淤堵现象 /
- 排水系统 /
- 效率 /
- 解决对策
Abstract: For the newly-dredged mud foundation improved by the no-sand-cushion vacuum preloading technology (NSVPT), the soil strength increases only a little, the effective improved depth is small and the ground bearing capacity is still low. To analyze the causes, more comprehensive researches are made on the engineering properties of newly-dredged mud from different areas, and the comparative single-well model experiments with 3 kinds of representative vertical drains are conducted in laboratory using NSVPT. It is concluded: (1) the severe clogging problem in vertical drains is induced by high content fine-grained soils (d0.005 mm), too small characteristic opening size of filter (O₉₅) and too fast loading rate of vacuum preloading; (2) the partial loss of vacuum degree is great, and the friction loss of vacuum degree is also greatly caused by serious curvature of vertical drains and large transfer resistance of vacuum degree in horizontal drains; (3) the drainage efficiency of drainage system is reduced and the vacuum pressure in soils is weakened so as to mitigate the improvement effect of soils owing to high content of strongly hydrophilic minerals, severe clogging in vertical drains and large loss of vacuum degree. Accordingly, some countermeasures are put forward.
- newly-dredged mud foundation /
- single-well model tests /
- no-sand-cushion vacuum preloading technology /
- clogging problem /
- drainage system /
- efficiency /
- countermeasure

HTML全文

参考文献(24)

[1]	董志良, 郑新亮, 戚国庆. 软土地基无砂垫层预压排水固结法: 中国, 200610033937.4[P]. 2006-09-27. (DONG Zhi-liang, ZHENG Xin-liang, QI Guo-qing. The drainage consolidation method of soft ground without sand-cushion: China, 200610033937.4[P]. 2006-09-27. (in Chinese))
[2]	董志良, 张功新, 莫海鸿, 等. 超软弱土浅表层快速加固方法及成套技术: 中国, 200810026168.4[P]. 2008-07-23. (DONG Zhi-liang, ZHANG Gong-xin, MO Hai-hong, et al. The improvement method and technology of ultra-soft soil: China, 200810026168[P]. 2008-07-23. (in Chinese))
[3]	董志良, 张功新, 郑新亮, 等. 一种超软弱土浅表层快速加固系统: 中国, 200720050339.8[P]. 2008-02-20. (DONG Zhi-liang, ZHANG Gong-xin, ZHENG Xin-liang, et al. An improvement system of shallow ultra-soft soil: China, 200720050339.8[P]. 2008-02-20. (in Chinese))
[4]	张功新, 陈平山. 浅表层超软弱土快速加固技术研究[R]. 广州: 中交四航工程研究院有限公司, 2009. (ZHANG Gong-xin, CHEN Ping-shan. Research of improvement technology of shallow ultra-soft soil)[R]. Guangzhou: CCCC Fourth Harbor Engineering Institute Co., Ltd, 2009. (in Chinese))
[5]	董志良, 张功新, 周琦, 等. 天津滨海新区吹填造陆超软土浅层加固技术研发及应用[J]. 岩石力学与工程学报, 2011, 30(5): 1306-1312. (DONG Zhi-liang, ZHANG Gong-xin, ZHOU Qi. Research and application of improvement technology of shallow ultra-soft soil formed by dredged in tianjin binhai new area[J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(5): 1073-1080)
[6]	关云飞, 唐彤芝, 陈海军, 等. 超软土地基真空预压浅层加固现场试验研究[J]. 岩土工程学报, 2011, 33(增刊1): 97-101. (GUAN Yun-fei, TANG Tong-zhi, CHEN Hai-jun, et al. Field tests on shallow treatment of super-soft ground by vacuum preloading method[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(S1): 97-101. (in Chinese))
[7]	董志良, 周琦, 张功新, 等. 天津滨海新区浅层超软土加固技术现场对比试验[J]. 岩土力学, 2012, 33(5): 1073-1080. (DONG Zhi-liang, ZHOU Qi, ZHANG Gong-xin. Field comparison test of reinforcement technology of shallow ultra-soft soil in Tianjin Binhai New Area[J]. Rock and Soil Mechanics, 2012, 33(5): 1073-1080. (in Chinese))
[8]	董志良, 张功新, 陈平山, 等. 深厚超软土地基处理关键技术研究[R]. 广州: 中交第四航务工程局有限公司, 2013. (DONG Zhi-liang, ZHANG Gong-xin, CHEN Ping-shan, et al. Key technology research on improvement of deep ultra-soft soil foudation[R]. Guangzhou: CCCC Fourth Harbor Engineering Co, Ltd., 2013. (in Chinese))
[9]	杨静. 高黏粒含量吹填土加固过程中结构强度的模拟实[9] 验研究[D]. 长春: 吉林大学, 2009. (YANG Jin. Simulation study on structural strength of dredger fill with high clay content during consolidation progress[D]. Changchun: Jilin University, 2009. (in Chinese))
[10]	关云飞. 吹填淤泥固结特性与地基处理试验研究[D]. 南京: 南京水利科学研究院, 2009. (GUAN Yun-fei. Study on consolidation characteristic and ground treatment approach of hydraulic filling mud[D]. Nanjing: Nanjing Hydraulic Research Institute, 2009. (in Chinese))
[11]	丁明武, 陈平山, 林涌潮. 浅表层加固技术在新近吹填淤泥地基处理中的应用[J]. 水运工程, 2011(10): 120-124. (DING Ming-wu, CHEN Ping-shan, LIN Yong-chao. Application of surface-layer improvement technology for newly-dredged sludge foundation treatment [J]. Waterway Engineering, 2011(10): 120-124. (in Chinese))
[12]	应舒, 高长胜, 黄家青. 新近吹填淤泥地基浅层处理试验研究[J]. 岩土工程学报, 2010, 32(12): 1956-1960. (YING Shu, GAO Chango-sheng, HUANG Jia-qing. Experimental study on surface-layer improvement of soft foundation filled by newly dreged mud[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(12): 1956-1960. (in Chinese))
[13]	张明, 赵有明, 龚镭, 等. 深圳湾新吹填超软土固结系数的试验研究[J]. 岩石力学与工程学报, 2010, 29(增刊1): 3157-3161. (ZHANG Ming, ZHAO You-ming, GONG Lei, et al. Test study of coefficient of consolidation of newly hydraulic fill ultra-soft soil in Shenzhen Bay[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(S1): 3157-3161. (in Chinese))
[14]	宋晶, 王清, 夏玉斌, 等. 真空预压处理高黏粒吹填土的物理化学指标[J]. 吉林大学学报(地球科学版), 2011, 41(5): 1476-1480. (SONG Jing, WANG Qing, XIA Yu-bin, et al. Physical and chemical indicators of dredger fill with high clay by vacuum preloading[J]. Journal of Jilin University (Earth Science Edition)), 2012, 41(5): 1476-1480. (in Chinese))
[15]	周源, 刘传俊. 透气真空快速泥水分离技术室内模型试验研究[J]. 真空科学与技术学报, 2010, 30(2): 215-220. (ZHOU Yuan, LIU Chuan-jun. Lab simulation of rapid vacuum consolidated draining of aerated sludge[J]. Chinese Journal of Vacuum Science and Technology, 2010, 30(2): 215-220. (in Chinese))
[16]	宋晶, 王清. 真空预压处理高黏粒吹填土的物理化学指标[J]. 吉林大学学报(地球科学版), 2011, 41(5): 1476-1480. (SONG Jing, WANG Qing. Physical and chemical indicators of dredger fill with high clay by vacuum preloading[J]. Journal of Jilin University (Earth Science Editon), 2011, 41(5): 1476-1480. (in Chinese))
[17]	杨顺安, 张瑛玲, 刘虎中. 深圳地区吹填淤泥的工程特征[J]. 地质科技情报, 1997, 16(1): 87-91. (YANG Shun-an, ZHANG Ying-ling, LIU Hu-zhong. Engineering Characteristics of Blow Filled Soft Clay in Shenzhen Area[J]. Geological Science and Technology Information, 1997, 16(1): 87-91. (in Chinese))
[18]	叶国良, 郭述军, 朱耀庭. 超软土的工程性质分析[J]. 中国港湾建设, 2010(5): 1-9. (YE Guo-liang, GUO Shu-jun, ZHU Yao-ting. Analysis on engineering property of ultra soft soil[J]. China Harbour Engineering, 2010(5): 1-9. (in Chinese))
[19]	李云华, 马哲, 张季超. 动力排水固结法加固某吹填淤泥地基试验研究[J]. 工程力学, 2010, 27(增刊1): 77-80. (LI Yun-hua, MA Zhe, ZHANG Ji-chao. Experimental study on a hydraulic fill mud foundation treated by dynamic drainage consolidation[J]. Engineering Mechanics, 2010, 27(S1): 77-80. (in Chinese))
[20]	JGJ 79—2012建筑地基处理技术规范[S]. 2012. (JGJ 79—2012 Technical code for ground treatment of buildings[S]. 2012. (in Chinese))
[21]	JTS 206—1—2009水运工程塑料排水板应用技术规程[S]. 2009. (JTS 206—1—2009 Technical specification for application of plastic drainboard for port and waterway engineering[S]. 2009. (in Chinese))
[22]	JTJ/T 019—98公路土工合成材料应用技术规范[S]. 1999. (JTJ/T 019—98 Technical specifications for application of geosynthetics in highway[S]. 1999. (in Chinese))
[23]	SL/T 225—98水利水电工程土工合成材料应用技术规范[S]. 1998. (SL/T 225—98 Standard for applications of geosynthetics in hydraulic and hydro-power engineering[S]. 1998. (in Chinese))
[24]	TB 10118—2006铁路路基土工合成材料应用设计规范[S]. 2006. (TB 10118—2006 Code for design for applications of geosynthetics on subgrade of railway[S]. 2006. (in Chinese))