堆载和固结对高饱和度废弃黏土抗剪强度影响

徐辉; 王锦楠; 李升智; 王璐楠; 詹良通

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中国环境科学 ›› 2024, Vol. 44 ›› Issue (8) : 4446-4454.

固体废物

堆载和固结对高饱和度废弃黏土抗剪强度影响

徐辉¹, 王锦楠^1,2, 李升智¹, 王璐楠¹, 詹良通³

作者信息 +

Effect of dumping protocol and consolidation on shear strength of highly saturated abandoned-clay

XU Hui¹, WANG Jin-nan^1,2, LI Sheng-zhi¹, WANG Lu-nan¹, ZHAN Liang-tong³

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文章历史 +

摘要

以杭州某基坑开挖渣土为研究对象,开展了24组大尺寸固结-直剪试验,研究了瞬时、阶梯型和斜坡型3种加载方式下高饱和度黏土固结过程抗剪强度的变化规律.结果表明,在上覆荷载作用下,土体产生瞬时压缩,压缩量随荷载的增大而增加;在3种加载方式下,当最终荷载相同时,最终沉降量较为接近;剪切曲线为应变硬化型,初始切线模量和最终剪应力均随固结度或上覆荷载的增大而提高;加载方式对初始切线模量有一定影响,对最终剪应力影响较小;抗剪强度随固结度的增长呈线性增大趋势,增大幅度随荷载的增大而显著;在3种加载方式下,当上覆荷载和固结度相同时,抗剪强度基本接近.基于试验结果,建立了高饱和度黏土固结过程抗剪强度预测模型,并利用本文试验数据和文献数据验证了其可靠性.模型分析结果表明:随着固结度的增长,抗剪强度包络线截距呈线性增大,而弯曲程度呈线性减小.在高饱和度废弃黏土堆填工程中,可采用本文建立的模型来预测不同堆填方式下土体固结过程的抗剪强度.

Abstract

In this paper, 24 sets of large-scale combined tests of consolidation and direct shear were conducted on the representative abandoned-soil samples that obtained from a foundation engineering site in Hangzhou. They were performed to investigate the shear strength behavior of highly saturated clay during consolidation under three loading protocols of instantaneous, stepped and linear stress. The results show that: the highly saturated clay had immediate compression after the application of overburden stress and the compression increased with an increase in the stress; when the final stresses of three loading protocols were the same, the final settlement was relatively close; the shear curves were strain hardening, and the initial tangent modulus and final shear stress both increased with the increase of consolidation degree or overburden stress; the loading protocol had a certain effect on the initial tangent modulus, but had a smaller effect on the final shear stress; the shear strength increased linearly with the growth of consolidation degree, and the magnitude of increase was significant with increasing stress; when the overburden stress and consolidation degree were consistent, the shear strength was essentially similar under three loading protocols. Based on the above findings, a shear strength prediction model of highly saturated clay considering consolidation was established and its reliability was verified using the data from this study and relevant literature. The model analysis results show that: with the growth of consolidation degree, the shear strength envelope intercept increased linearly, while the bending degree decreased linearly. In the highly saturated abandoned-clay dumping projects, the model established in this paper can be used to predict the shear strength of the soil under consolidation process of different dumping protocols.

导出引用

徐辉, 王锦楠, 李升智, 王璐楠, 詹良通. 堆载和固结对高饱和度废弃黏土抗剪强度影响[J]. 中国环境科学. 2024, 44(8): 4446-4454

XU Hui, WANG Jin-nan, LI Sheng-zhi, WANG Lu-nan, ZHAN Liang-tong. Effect of dumping protocol and consolidation on shear strength of highly saturated abandoned-clay[J]. China Environmental Science. 2024, 44(8): 4446-4454

中图分类号： X705 TU453

参考文献

[1] Shang C, Zhu Y, Zhang Z. A Glance at the World [J]. Waste Management, 2013,33:489-492.
[2] Kataguiri K, Boscov M E G, Teixeira C E, et al. Characterization flowchart for assessing the potential reuse of excavation soils in Sao Paulo city [J]. Journal of Cleaner Production, 2019,240:118-215.
[3] Zhan L T, Zhang Z, Chen Y M, et al. The 2015 Shenzhen catastrophic landslide in a construction waste dump: Reconstitution of dump structure and failure mechanisms via geotechnical investigations [J]. Engineering Geology, 2018,238:15-26.
[4] 袁剑,曾现来,陈明.基于灰色系统理论的济南市建筑废物产量预测[J]. 中国环境科学, 2020,40(9):3894-3902. Yuan J, Zeng X L, Chen M. Estimating the construction waste generation in Jinan using the grey system theory [J]. China Environmental Science, 2020,40(9):3894-3902..
[5] 刘婷婷,张劼,胡鸣明.建筑废弃物资源化环境效益分析:以重庆为例[J]. 中国环境科学, 2018,38(10):3853-3867. Liu T T, Zhang J, Hu M M. Analysis on environmental benefits of construction and demolition waste recycling: A case study in Chongqing [J]. China Environmental Science, 2018,38(10):3853-3867.
[6] 倪涛.消纳场在渣土填埋处置中的建设与技术研究[J]. 科学技术创新, 2023,9:154-157. Ni T. Research status and development trend of waste residue disposal site [J]. Scientific and Technological Innovation, 2023,9:154-157.
[7] 魏晓倩,姜建芳,冯肖嘉文,等.不同城市建筑垃圾填埋区域地下水水质对比和溯源[J/OL]. 中国环境科学:1-16[2024-06-05]. Wei X Q, Jiang J F, Feng X J W, et al. Comparison and source apportionment of groundwater quality in different urban construction waste landfill areas [J/OL]. China Environmental Science:1-16[2024- 06-05].
[8] Yin Y, Li B, Wang W, et al. Mechanism of the December 2015 Catastrophic Landslide at the Shenzhen Landfill and Controlling Geotechnical Risks of Urbanization [J]. Engineering, 2016,2(2):230-249.
[9] 祁志.无锡市某堆山工程山体滑坡原因分析及整治方案[J]. 江苏科技大学学报(自然科学版), 2011,25:142-143. Qi Z. Analysis of the causes of landslides and remediation plan for a piled mountain project in Wuxi City [J]. Journal of Jiangsu University of Science and Technology (Natural Science Edition), 2011,25:142-143.
[10] 顾凤祥,阎长虹,王彬,等.江苏某市人工堆山坍塌机理分析[J]. 工程地质学报, 2011,19(5):697-702. Gu F X, Yan C H, Wang B, et al. Mechanism analysis of heap hill collapse in urban area of southern Jiangsu [J]. Journal of Engineering Geology, 2011,19(5):697-702.
[11] 张志峰,李明东,田安国,等.连云港渣土淤泥的性质和烧结建材可行性[J]. 江苏建筑, 2015,3:104-107. Zhang Z F, Li M D, Tian A G, et al. The properties and feasibility for sintering materials of construction waste residue in Lianyungang [J]. Jiangsu Construction, 2015,3:104-107.
[12] 杨龙,姚文敏,曾江波,等.堆填分层与降雨入渗条件下渣土边坡稳定性研究[J]. 人民长江, 2019,50(10):175-181. Yang L, Yao W M, Zeng J B, et al. Stability of construction solid waste slope considering filling stratification and rainfall infiltration [J]. Yangtze River, 2019,50(10):175-181.
[13] 王婧,曾庆军,陈平山,等.废弃渣土造陆的分层填埋方式对比[J]. 中国港湾建设, 2019,39(8):6-9. Wang J, Zeng Q J, Chen P S, et al. Comparison of stratified landfills for waste residue land making [J]. China Harbour Engineering, 2019, 39(8):6-9.
[14] Wheeler S J. A conceptual model for soils containing large gas bubbles [J]. Géotechnique, 1988,38(3):389-397.
[15] Grozic J L, Robertson P K, Morgrnstern N R. The behavior of loose gassy sand [J]. Canadian Geotechnical Journal, 1999,36(3):482-492.
[16] 李佐良,杨爱武,许再良,等.不同固结度对软土强度及变形的影响[J]. 中国港湾建设, 2012,179(2):47-50. Li Z L, Yang A W, Xu Z l, et al. Impact of different consolidation degrees on strength and deformation of soft soil [J]. China Harbour Engineering, 2012,179(2):47-50.
[17] 刘红军,靳晨杰.软土的固结状态对抗剪强度影响的研究[J]. 公路, 2015,60(10):51-55. Liu H J, Jin C J. Study on the influence of consolidation state of soft soil on shear strength [J]. Highway, 2015,60(10):51-55.
[18] 胡德金,高正中,陈治伙.不同固结度下软基土的力学特性[J]. 四川联合大学学报(工程科学版), 1999,5:106-110. Hu D J, Gao Z Z, Chen Z H. The strength properties of soft clay under different consolidation degree [J]. Journal of Sichuan Union University (Engineering Science Edition), 1999,5:106-110.
[19] 包伟力,周小文.地基强度随固结度增长规律的试验研究[J]. 长江科学院院报, 2001,4:29-31,39. Bao W L, Zhou X W. Experimental study on growth regularity of soil strength with consolidation [J]. Journal of Yangtze River Scientific Research Institute, 2001,4:29-31,39.
[20] 戚玉红,田伟,杨鸿钧,等.海口市东海岸软土抗剪强度随固结度变化规律研究[J]. 港工技术, 2016,53(3):98-100. Qi Y H, Tian W, Yang H J, et al. Soft soil shear strength at east coast of Haikou city changes with degree of consolidation [J]. Port Engineering Technology, 2016,53(3):98-100.
[21] Park Y M, Um I J, Miura N, et al. A change of undrain shear strength of soft ground during consolidation process [J]. Applied Mechanics and Materials, 2014,513:269-272.
[22] Schlue B F, Morz T, Kreiter S. Undrained shear strength properties of organic harbor mud at low consolidation stress levels [J]. Canadian Geotechnical Journal, 2011,48(3):388-398.
[23] Lou C, Ni J, Chai J, et al. Consolidation effect of prefabricated vertical drains with different lengths for soft subsoil under vacuum preloading [J]. Advances in Civil Engineering, 2019,7428595.
[24] 唐炫,魏丽敏,胡海军.不同固结度下软土的力学特性[J]. 铁道勘察, 2009,4:25-26. Tang X, Wei L M, Hu H J. Mechanical properties of soft soil with different consolidation degrees [J]. Railway Investigation and Surveying, 2009,4:25-26.
[25] Liu H J, Shan W, Yang Y Q, et al. The engineering properties comparative study of Wetlands soft soil and soft soil of other genesis [J]. Advanced Materials Research, 2011,150:484-492.
[26] 邱青长,邱超.软粘土的抗剪强度指标试验分析[J]. 湖南轻工业高等专科学校学报, 2003,4:10-13. Qiu Q C, Qiu C. The experiment analysis on soft clay about the shear strength indexes [J]. Journal of Changsha University of Science and Technology (Natural Science), 2003,4:10-13.
[27] 邱青长,黄生文.软粘土抗剪强度参数试验研究[J]. 土工基础, 2004,1:37-40. Qiu Q C, Huang S W. The experiment study on soft clay about the shear strength parameters [J]. Soil Engineering and Foundation, 2004, 1:37-40.
[28] 刘银生.软粘土强度参数与固结时间及荷载关系的研究[J]. 中南公路工程, 2005,2:11-14. Liu Y S. Relationships between of shear strength parameters, consolidation time, and load of soft clay [J]. Central South Highway Engineering, 2005,2:11-14.
[29] 岳鹏坡,张宏明.软土的不同固结度三轴固结不排水剪切试验浅析[J]. 四川水泥, 2016,9:281-282. Yue P P, Zhang H M. Elementary analysis of consolidation-undrained triaxial shear test of soft soil with different degree of consolidation [J]. Sichuan Cement, 2016,9:281-282.
[30] 何群,冷伍明,魏丽敏.软土抗剪强度与固结度关系的试验研究[J]. 铁道科学与工程学报, 2005,2:51-55. He Q, Leng W M, Wei L M. Experimental study on relationship between soft soil' s shear strength and degree of consolidation [J]. Journal of Railway Science and Engineering, 2005,2:51-55.
[31] 何群,冷伍明,魏丽敏,等.固结度与加载方式对软土抗剪强度的影响[J]. 公路交通科技, 2005,1:29-32. He Q, Leng W M, Wei L M, et al. Effects pf consolidation degree and loading method on soft soil' s shear strength [J]. Journal of Highway and Transportation Research and Development, 2005,1:29-32.
[32] 魏丽敏,胡海军,王宏贵,等.饱和黏土任意固结度强度指标计算公式及工程应用[J]. 武汉理工大学学报(交通科学与工程版), 2009, 33(1):68-71. Wei L M, Hu H J, Wang H G, et al. Formula and application of undrained shear strength index of saturated clay under arbitrary degree of consolidation [J]. Journal of Wuhan University of Technology (Transportation Science and Engineering), 2009,33(1):68-71.
[33] 汪洪星,杨春和,陈锋,等.软土抗剪强度指标随固结度变化规律分析[J]. 岩土力学, 2014,35(S1):106-112. Wang H X, Yang C H, Chen F, et al. Analysis of changing rule of shear strength indexes of soft soil with consolidation degree [J]. Rock and Soil Mechanics, 2014,35(S1):106-112.
[34] Liu Y, Sun C, Li S. Analysis of structural soil’s shear strength under arbitrary degree of consolidation [J]. Applied Mechanics and Materials, 2014,580:774-777.
[35] Zeng L L, Gao Y F, Hong Z S. Quantitative shear strength- consolidation stress-void ratio interrelations for reconstituted clays [J]. Géotechnique, 2021,71(10):843-852.
[36] Chang C S, Duncan J M. Consolidation Analysis for Partly Saturated Clay by Using an Elastic-Plastic Effective Stress-Strain Model [J]. International Journal for Numerical and Analytical Methods in Geomechanics, 1983,7:39-55.
[37] 殷宗泽,凌华.非饱和土一维固结简化计算[J]. 岩土工程学报, 2007,5:633-637. Yin Z Z, Ling H. Simplified computation of 1D consolidation for partially saturated soil [J]. Chinese Journal of Geotechnical Engineering, 2007,5:633-637.
[38] Sills G C, Wheeler S J, Thomas S D, et al. Behaviour of offshore soils containing gas bubbles [J]. Géotechnique, 1991,41(2):227-241.
[39] 中华人民共和国住房和城乡建设部.GB 50007-2011建筑地基基础设计规范[S]. 北京:中国建筑工业出版社, 2012. Ministry of Housing and Urban-Rural Development of the People's Republic of China. GB 50007-2011Code for design of building foundation [S]. Beijing: China Architecture & Building Press, 2012.
[40] 淦树成.堆填速率对软弱基底排土场稳定性影响研究[D]. 重庆:重庆大学, 2022. Gan S C. Study on the influence of landfill rate on the stability of soft foundation dump [D]. Chongqing: Chongqing University, 2022.
[41] 徐肖峰,魏厚振,孟庆山,等.直剪剪切速率对粗粒土强度与变形特性的影响[J]. 岩土工程学报, 2013,35(4):728-733. Xu X F, Wei H Z, Meng Q S, et al. Effects of shear rate on shear strength and deformation characteristics of coarse-grained soils in large-scale direct shear tests [J]. Chinese Journal of Geotechnical Engineering, 2013,35(4):728-733.
[42] 詹良通,孙倩倩,郭晓刚,等.花岗岩风化料弃土快速堆填过程中不排水抗剪强度评估[J]. 岩土力学, 2021,42(1):50-58. Zhan L T, Sun Q Q, Guo X G, et al. Estimation of undrained shear strength of completely decomposed granite waste during rapid landfilling [J]. Rock and Soil Mechanics, 2021,42(1):50-58.
[43] 徐可,高翔,郑泽宇.不排水强度随固结度增长特性试验研究[J]. 河北工程大学学报(自然科学版), 2017,34(4):19-22,36. Xu K, Gao X, Zheng Z Y. Experimental research of undrained strength with the increasing of consolidation degree [J]. Journal of Hebei University of Engineering (Natural Science Edition), 2017,34(4):19- 22,36.
[44] 马旭.荷载作用下软粘土地基土性指标变化规律及承载力研究[D]. 天津:天津大学, 2014. Ma X. Study on the variation laws of soil indexes and bearing capacity of the soft clay foundation under load action [D]. Tianjin: Tianjin University, 2014.
[45] 陈伟志,蒋关鲁,王智猛,等.分级连续加载条件下原状膨胀土固结变形研究[J]. 岩土力学, 2014,35(3):710-716. Chen W Z, Jiang G L, Wang Z M, et al. Study of consolidation deformation of intact expansive soil under stage continuous loading conditions [J]. Rock and Soil Mechanics, 2014,35(3):710-716.
[46] 王元战,马旭,马楠.荷载作用下软粘土土性指标变化规律试验研究[J]. 水道港口, 2015,36(4):339-344. Wang Y Z, Ma X, Ma N. Experimental study on variation law of soil indexes of soft clay under load action [J]. Journal of Waterway and Harbor, 2015,36(4):339-344.
[47] 贺登芳.干湿循环红土的CD剪切特性及邓肯-张模型参数研究[D]. 昆明:昆明理工大学, 2021. He D F. The study on CD shear characteristics of laterite and Duncan- Chang model parameters under the action of drying-wetting cycle [D]. Kunming: Kunming University of Science and Technology, 2021.
[48] 曹雪山,殷宗泽.土石坝心墙水力劈裂的非饱和土固结方法研究[J]. 岩土工程学报, 2009,31(12):1851-1857. Cao X S, Yin Z Z. Consolidation method of unsaturated soils for hydraulic fracturing of core walls of rock-fill dams [J]. Chinese Journal of Geotechnical Engineering, 2009,31(12):1851-1857.
[49] 曹雪山,殷宗泽.一维非饱和土固结简化计算的改进方法[J]. 公路交通科技, 2009,26(10):1-5. Cao X S, Yin Z Z. An improved method of simplified computation of 1D consolidation for unsaturated soil [J]. Journal of Highway and Transportation Research and Development, 2009,26(10):1-5.
[50] 缪林昌,崔颖.非饱和土的固结与水力特性研究[J]. 西北地震学报, 2011,33(S1):38-42. Miao L C, Cui Y. Study on consolidation and hydro-mechanics behaviors of unsaturated soils [J]. China Earthquake Engineering Journal, 2011,33(S1):38-42.
[51] 李广信,张丙印,于玉贞.土力学(第2版) [M]. 北京:清华大学出版社, 2013. Li G X, Zhang B Y, Yu Y Z. Soil mechanics (2nd edition) [M]. Beijing: Tsinghua University Press, 2013.
[52] 王晓英.关于平面曲线曲率计算公式的探讨[J]. 赤峰学院学报(自然科学版), 2016,32(23):4. Wang X Y. On calculation formula of plane curve curvature [J]. Journal of Chifeng University (Natural Science Edition), 2016,32(23):4.
[53] 熊承仁,刘宝琛,张家生,等.重塑非饱和粘性土的抗剪强度参数与物理状态变量的关系研究[J]. 中国铁道科学, 2003,3:18-21. Xiong C R, Liu B C, Zhang J S, et al. Relation between shear strength parameters and physical state variables of remolded unsaturated cohesive soil [J]. China Railway Science, 2003,3:18-21.
[54] 王娟娟,张秀丽,王铁行.考虑含水量和密度影响的压实黄土抗剪强度特性研究[J]. 西安建筑科技大学学报(自然科学版), 2014, 46(5):687-691. Wang J J, Zhang X L, Wang T X. The study on characteristics of shear strength of compacted loess considering the effects of water content and density [J]. Journal of Xi'an University of Architecture and Technology (Natural Science Edition), 2014,46(5):687-691.