Analysis of the influence of solidified slurry buttress support on the deformation of soil outside the pit
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摘要: 为推动废弃泥浆的资源化利用，提出将工程废弃泥浆改良并用于扶壁式基坑支护结构中的扶壁墙。利用PLAXIS 3D有限元软件建立三维模型，验证模型可靠性并对比分析有无泥浆扶壁作用下坑外土体变形的差异。计算结果表明：模型较好地反映了坑外土体变形情况，相较无泥浆扶壁，支护中预先设置的泥浆扶壁墙体可减小坑外地表土体变形，在各种参数的不利工况下，地表沉降量降幅仍可达73.3%，地表水平位移降幅可达66.4%；预置扶壁墙对坑外深层土体变形趋势影响较小，可有效控制坑外深层土体变形，并缩小不利变形影响区域；预置泥浆扶壁墙不仅能够对坑外土体变形所产生的角应变和拉应变进行约束，也能降低角应变和拉应变影响范围，进而一定程度上减少角应变和拉应变对坑边既有建构筑物及管线的损害。Abstract: To effectively solve the two major problems of controlling engineering waste generation and foundation pit deformation, this research proposes to improve the engineering waste mud and use it in the buttress wall of the buttress foundation pit support structure. The three-dimensional model was established by using PLAXIS 3D finite element software. The reliability of the model was verified and the difference of soil deformation outside the pit under the action of slurry buttress was compared and analyzed. The calculation results show that the constitutive model can better reflect the deformation of the soil outside the pit. Compared with no slurry buttress, the pre-buried slurry buttress wall can pre-suppress the adverse deformation of the surface soil outside the pit. Under the most dangerous working conditions, the surface settlement can be reduced by 73.3%, and the horizontal displacement of the surface can be reduced by 66.4%. The embedded buttress wall has little effect on the deformation trend of deep soil outside the pit, but it can effectively control the deformation of deep soil outside the pit and reduce the area affected by adverse deformation. The embedded slurry buttress wall can not only constrain the maximum angular strain and tensile strain generated by the deformation of the soil outside the pit, but also reduce the influence range of angular strain and tensile strain, thus reducing the damage of angular strain and tensile strain to the existing buildings near the pit to a certain extent.
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图 3 原基坑支护结构实测测点图
Figure 3. Measured measuring point diagram of the original foundation pit supporting structure
图 4 固化泥浆扶壁式基坑支护体系
Figure 4. Solidified slurry buttressed foundation pit supporting system
图 6 无扶壁围护结构及坑外地表土体变形趋势对比
Figure 6. Comparison of the deformation trend of the retaining structure without buttress and the surface soil outside the pit
图 7 不同工况下坑外地表沉降曲线
Figure 7. Ground surface settlement curve outside the pit under different working conditions
图 9 不同工况下坑外地表水平变形曲线
Figure 9. Horizontal deformation curve of ground surface outside the pit under different working conditions
图 10 坑外土体深层水平位移曲线
Figure 10. Deep horizontal displacement curve of soil outside the pit
表 1 模型土体参数表
Table 1. Model soil parameters table
土层性质 γ /(kN·m−3) c′ /kPa φ′ /(°) E50 /MPa Eoed /MPa Eur /MPa G0 /MPa γ0.7/×10−4 e ④ 1黏土 18.6 6.0 22.1 3.96 3.96 23.76 47.5 1.5 1.015 ⑥ 2淤泥质土 17.9 1.0 17.0 2.73 2.73 19.11 38.2 1.5 1.173 ⑥ 4粉质黏土 20.1 9.5 28.6 6.81 6.81 44.27 88.5 1.7 0.875 ⑧ 1粉质黏土 20.2 14.0 25.7 6.91 6.91 48.37 130.6 4.2 0.672 ⑨ 2粉砂 19.8 5.4 32.2 15.24 15.24 60.96 152.4 4.5 0.602 ⑩ 1粉质黏土 20.6 15.8 19.4 4.00 4.00 44.00 118.8 4.2 0.738 ⑪ 2粉砂 20.1 5.5 32.6 13.75 13.75 55.00 148.5 4.5 0.614 
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表 2 基坑开挖工况流程
Table 2. Foundation pit excavation process
工况 开挖深度/m 工作内容 架设支撑深度/m 材质 Ⅰ −1.8 拆除预埋泥浆扶壁 −1.3 钢混支撑 Ⅱ −6 −5.5 钢支撑 Ⅲ −10.2 −9.7 钢支撑 Ⅳ −14 −13.5 钢支撑 Ⅴ −17.07
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[1] 李丙坤. 深基坑桩墩扶壁式复合土钉墙支护结构数值模拟分析与研究[D]. 苏州: 苏州科技学院, 2011. (LI B K. Study on numerical simulation analysis of pile-anchored and soil nailed-wall in deep excavation[D]. Suzhou: Suzhou University of Science and Technology, 2012. (in Chinese)LI B K. Study on numerical simulation analysis of pile-anchored and soil nailed-wall in deep excavation[D]. Suzhou: Suzhou University of Science and Technology, 2012. (in Chinese) [2] HSIEH P G, OU C Y, HSIEH W H. Efficiency of excavations with buttress walls in reducing the deflection of the diaphragm wall[J]. Acta Geotechnica, 2016, 11(5): 1087-1102. doi: 10.1007/s11440-015-0416-6 [3] LIM A, HSIEH P G, OU C Y. Evaluation of buttress wall shapes to limit movements induced by deep excavation[J]. Computers and Geotechnics, 2016, 78: 155-170. doi: 10.1016/j.compgeo.2016.05.012 [4] HSIEH P G, OU C Y. Mechanism of buttress walls in restraining the wall deflection caused by deep excavation[J]. Tunnelling and Underground Space Technology, 2018, 82: 542-553. doi: 10.1016/j.tust.2018.09.004 [5] 李淼坤. 横隔墙布置方式对开挖前降水引发基坑变形影响规律研究[D]. 湘潭: 湖南科技大学, 2019. (LI M K. Effect of cross wall layout on foundation deformation caused by dewatering before soil excavation[D]. Xiangtan: Hunan University of Science and Technology, 2019. (in Chinese)LI M K. Effect of cross wall layout on foundation deformation caused by dewatering before soil excavation[D]. Xiangtan: Hunan University of Science and Technology, 2019. (in Chinese) [6] 曾超峰, 廖 欢, 李淼坤, 等. 内隔墙长度对抽水引发基坑围挡侧移的影响[J]. 浙江大学学报(工学版), 2021, 55(12): 2252-2259. (ZENG C F, LIAO H, LI M K, et al. Effect of buttress wall length on retaining wall deflection induced by dewatering[J]. Journal of Zhejiang University (Engineering Science), 2021, 55(12): 2252-2259. (in Chinese)ZENG C F, LIAO H, LI M K, et al. Effect of buttress wall length on retaining wall deflection induced by dewatering[J]. Journal of Zhejiang University (Engineering Science), 2021, 55（12）: 2252-2259. (in Chinese) [7] OU C Y, HSIEH P G, LIN Y L. Performance of excavations with cross walls[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2011, 137(1): 94-104. doi: 10.1061/(ASCE)GT.1943-5606.0000402 [8] TAN Y, LI X, KANG Z J, et al. Zoned excavation of an oversized pit close to an existing metro line in stiff clay: case study[J]. Journal of Performance of Constructed Facilities, 2015, 29(6): 1-19. [9] LI M G, ZHANG Z J, CHEN J J, et al. Zoned and staged construction of an underground complex in Shanghai soft clay[J]. Tunnelling and Underground Space Technology, 2017, 67: 187-200. doi: 10.1016/j.tust.2017.04.016 [10] 吴 忠, 王海鹏, 何 勇, 等. 扶壁间距对T型地下连续墙开挖稳定性影响研究[J]. 建筑结构, 2019, 49(S2): 850-853. (WU Z, WANG H P, HE Y, et al. Study on the effect of buttress spacing for T-type diaphragm wall on the stability of excavation[J]. Building Structure, 2019, 49(S2): 850-853. (in Chinese)WU Z, WANG H P, HE Y, et al. Study on the effect of buttress spacing for T-type diaphragm wall on the stability of excavation[J]. Building Structure, 2019, 49（S2）: 850-853. (in Chinese) [11] 葛 梁, 冯龙飞. T型地连墙基坑支护结构的有限元分析[J]. 广东土木与建筑, 2013, 20(11): 17-20. (GE L, FENG L F. Numerical simulation analysis of T-type diaphragm wall supporting system in a foundation pit[J]. Guangdong Architecture Civil Engineering, 2013, 20(11): 17-20. (in Chinese)GE L, FENG L F. Numerical simulation analysis of T-type diaphragm wall supporting system in a foundation pit[J]. Guangdong Architecture Civil Engineering, 2013, 20（11）: 17-20. (in Chinese) [12] 殷俊鹏, 张 啸, 阮怀宁, 等. 基坑开挖对T型地下连续墙水平位移的影响[J]. 科学技术与工程, 2017, 17(7): 232-236. (YIN J P, ZHANG X, RUAN H N, et al. Effect of excavation on horizontal displacement of t-type diaphragm wall[J]. Science and Technology and Engineering, 2017, 17(7): 232-236. (in Chinese)YIN J P, ZHANG X, RUAN H N, et al. Effect of excavation on horizontal displacement of t-type diaphragm wall[J]. Science and Technology and Engineering, 2017, 17（7）: 232-236. (in Chinese) [13] HSU C F, KUAN C F, CHEN S L. Three-dimensional numerical analysis on the Influence of buttress wall removal timing on the lateral deformation of diaphragm walls during deep excavation[J]. Buildings, 2023, 13(11): 2678. doi: 10.3390/buildings13112678 [14] 武 峰, 刘永超, 王洪磊, 等. 废弃泥浆配置膏状浆液的研究及应用//中国建筑学会地基基础学术大会论文集(2022). 北京: 中国建筑学会地基基础分会, 中国建筑科学研究院有限公司地基基础研究所, 北京金山基础工程咨询有限公司, 2023: 561-567. (WU F, LIU Y C, WANG H L, et al. Research and application of paste grout in waste mud[C]//Proceedings of the Collection of Papers of Foundation Academic Conference of China Academy of Architecture (2022). Beijing: Institute of Soil and Foundation Engineering-ASC, Institute of Foundation Engineering of China Academy of Building Research, Beijing Jinshan Foundation Engineering Consulting Co. , Ltd. , 2023: 561-567. (in Chinese)WU F, LIU Y C, WANG H L, et al. Research and application of paste grout in waste mud[C]//Proceedings of the Collection of Papers of Foundation Academic Conference of China Academy of Architecture (2022). Beijing: Institute of Soil and Foundation Engineering-ASC, Institute of Foundation Engineering of China Academy of Building Research, Beijing Jinshan Foundation Engineering Consulting Co. , Ltd. , 2023: 561-567. (in Chinese) [15] 曹宝飞. 水泥土变形模量及弹性模量试验研究[J]. 中国西部科技, 2006(34): 18-19. (CAO B F. Experimental study on deformation modulus and elastic modulus of cemented soil[J]. Science and Technology of West China, 2006(34): 18-19. (in Chinese)CAO B F. Experimental study on deformation modulus and elastic modulus of cemented soil[J]. Science and Technology of West China, 2006(34): 18-19. (in Chinese) [16] 徐中华. 上海地区支护结构与主体地下结构相结合的深基坑变形性状研究[D]. 上海: 上海交通大学, 2007. (XU Z H. Deformation behavior of deep excavations supported by permanent structure in Shanghai soft deposit[D]. Shanghai: Shanghai Jiao Tong University, 2007. (in Chinese)XU Z H. Deformation behavior of deep excavations supported by permanent structure in Shanghai soft deposit[D]. Shanghai: Shanghai Jiao Tong University, 2007. (in Chinese) [17] HSIEH P G, OU C Y. Shape of ground surface settlement profiles caused by excavation[J]. Canadian Geotechnical Journal, 1998, 35(6): 1004-1017. doi: 10.1139/t98-056 [18] SCHUSTER M, KUNG G T C, JUANG C H, et al. Simplified model for evaluating damage potential of buildings adjacent to a braced excavation[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2009, 135(12): 1823-1835. doi: 10.1061/(ASCE)GT.1943-5606.0000161 [19] 天津市住房和城乡建设委员会. 天津市建筑基坑工程技术规程: DB/T 29—202—2022[S]. 天津: 天津建委, 2022. (Tianjin Housing and Urban-Rural Construction Commission. Tianjin technical specification for retaining and protection of building foundation excavation: DB/T 29—202—2022[S]. Tianjin: Tianjin Construction Commission, 2022. (in Chinese)Tianjin Housing and Urban-Rural Construction Commission. Tianjin technical specification for retaining and protection of building foundation excavation: DB/T 29—202—2022[S]. Tianjin: Tianjin Construction Commission, 2022. (in Chinese) [20] 罗阳洋. 软土地区深基坑的过大变形分析[D]. 天津: 天津大学, 2012. (LUO Y Y. Analysis on excessive deformation during deep foundation excavation in soft soil area[D]. Tianjin: Tianjin University, 2012. (in Chinese)LUO Y Y. Analysis on excessive deformation during deep foundation excavation in soft soil area[D]. Tianjin: Tianjin University, 2012. (in Chinese) -
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