Proceedings of the Institution of Civil Engineers-Ground Improvement最新文献

Investigation of bottom ash as a partial replacement to conventional subbase soils 底灰部分替代常规底基土的研究

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2023-09-01 DOI: 10.1680/jgrim.21.00038

Thet Htet Ye Htun, Parnthep Julnipitawong, Weeraya Chimoye, Somnuk Tangtermsirikul

引用次数: 1

Assessment of alkali-induced heave in soil and its stabilisation using slag 土中碱致隆起评价及矿渣稳定

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2023-09-01 DOI: 10.1680/jgrim.21.00019

Manish Kumar Mandal, Bala Ramudu Paramkusam

{"title":"Assessment of alkali-induced heave in soil and its stabilisation using slag","authors":"Manish Kumar Mandal, Bala Ramudu Paramkusam","doi":"10.1680/jgrim.21.00019","DOIUrl":"https://doi.org/10.1680/jgrim.21.00019","url":null,"abstract":"Soil–alkali-interaction results in unexpected heaving and other negative effects of soil properties, which can lead to complete failure of structures. An investigation was carried out on the impact of highly concentrated sodium hydroxide alkali on the heaving behaviour of low-plasticity clay. The effect of ground-granulated blast-furnace slag as a stabiliser for alkali-interacted soil was also investigated. The interaction of alkali with the soil showed heaving up to 5.25% after 30 days, while a slag content of 20% showed maximum suppression of heave. The alkali-interacted soil stabilised with slag was also compared with un-interacted soil mixed with slag. There was a marginal increase in friction angle with an increase in curing period, and a significant increase in cohesion for both. A substantial improvement in unconfined compressive strength was also evident with increased slag content and curing period. The results were supported by microstructural examinations. The application of slag as a liquid-based stabiliser for alkali-interacted soil was also conducted using electrokinetics. Statistical analysis indicated that the curing period was a dominant parameter in affecting the compressive strength of un-interacted soil while, for alkali-interacted soil, slag content was more dominant.","PeriodicalId":51705,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Ground Improvement","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135685700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of surcharge loads during curing of lime stabilised Cochin marine clay 石灰稳定科钦海相粘土固化过程中附加荷载的影响

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2023-08-23 DOI: 10.1680/jgrim.22.00051

Rija Johny, B. M. Abraham, A. Sridharan

引用次数: 0

Effect of smear zone on the consolidation and strength characteristics of soil under radial drainage 涂抹带对径向排水条件下土体固结及强度特性的影响

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2023-08-18 DOI: 10.1680/jgrim.21.00040

R. Aparna, R. Robinson, S. R. Gandhi

{"title":"Effect of smear zone on the consolidation and strength characteristics of soil under radial drainage","authors":"R. Aparna, R. Robinson, S. R. Gandhi","doi":"10.1680/jgrim.21.00040","DOIUrl":"https://doi.org/10.1680/jgrim.21.00040","url":null,"abstract":"Vertical drains installed in soft clay deposits enhance the rate of consolidation in preloading projects. Using a mandrel to install the prefabricated vertical drains (PVD), its insertion and withdrawal will result in the remoulding of the soil zone surrounding it, called the smear zone. The extent of the smear zone is an important parameter that characterizes the smearing effect. This paper describes this effect in terms of smear ratio (i.e., the ratio of the diameter of smear zone ds to the diameter of drain, dw) on the consolidation characteristics of soil with radial drainage. A series of radial consolidation tests with a predetermined smear zone in a model unit cell was conducted by varying the diameter of the smear zone. The experimental results show that beyond a smear ratio of 4, the soil behaves as if it is in a fully remoulded condition. The results were compared with some of the theoretical approaches reported in the literature. The analytical solution that predicts the time-settlement curve in a better way is identified. Also, it is observed that the gain in undrained shear strength due to the consolidation of soft clay decreases with the increase in the diameter of the smear.","PeriodicalId":51705,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Ground Improvement","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83407261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of tyre crumbs on the stability of sand under constant shear drained stress 恒定剪切排水应力下轮胎碎屑对砂土稳定性的影响

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2023-05-10 DOI: 10.1680/jgrim.22.00085

Shabir Ahmed, J. Vinod, M. Sheikh

引用次数: 0

Influence of type of drainage boundary on coefficient of horizontal consolidation 排水边界类型对水平固结系数的影响

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2023-04-20 DOI: 10.1680/jgrim.22.00055

G. Sridhar, R. Robinson, K. Rajagopal

{"title":"Influence of type of drainage boundary on coefficient of horizontal consolidation","authors":"G. Sridhar, R. Robinson, K. Rajagopal","doi":"10.1680/jgrim.22.00055","DOIUrl":"https://doi.org/10.1680/jgrim.22.00055","url":null,"abstract":"Vertical drains are used widely to accelerate the consolidation of soft clay deposits when preloading is used as a ground improvement technique. One of the essential input parameters required in Barron's theory is the coefficient of horizontal consolidation, ch. The values of ch can be determined by the radial consolidation test, using either a central sand drain or a porous plastic peripheral drain. This paper presents the laboratory tests carried out to understand the reason for the difference in values of ch determined from inward and outward radial flow consolidations tests. A 150 mm diameter instrumented consolidation cell was used to perform the inward or outward radial consolidation tests. The total stress measurements during consolidation showed non-uniform stress distribution in clay with higher effective stress values close to the drainage boundary. This stiffening of the clay close to the drain retards the consolidation rate resulting in reduced values of ch. As a result, the ch values determined by radially outward consolidation tests with larger drainage boundary area are lower to those obtained by the inward radial flow test. The pore water pressure measurements showed significantly higher undissipated pore water pressure away from the drainage boundary for the outward flow test.","PeriodicalId":51705,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Ground Improvement","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88923020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Permeation grouting in soils: numerical discussion of the reliability of a simplifying analytical approach 土中渗透注浆:一种简化解析方法可靠性的数值讨论

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2023-04-03 DOI: 10.1680/jgrim.22.00019

K. Boschi, D. Grassi, R. Castellanza, C. G. di Prisco

{"title":"Permeation grouting in soils: numerical discussion of the reliability of a simplifying analytical approach","authors":"K. Boschi, D. Grassi, R. Castellanza, C. G. di Prisco","doi":"10.1680/jgrim.22.00019","DOIUrl":"https://doi.org/10.1680/jgrim.22.00019","url":null,"abstract":"Permeation grouting, i.e. injections at low pressure values of either microfine cements or chemical products, is frequently adopted to increase the mechanical/hydraulic properties of soils and standard design approaches are currently either empirical or based on simplified analytical solutions. In this paper, some fundamental hypotheses of these analytical solutions are discussed by performing a campaign of finite element numerical analyses, in which the injection phase in a water saturated soil is analysed, a Newtonian rheology for the grout is implemented and the hypothesis of immiscibility for the two liquids is assumed. The injection source geometry effect is discussed, as well as the role of gravity and capillarity. The authors analyse the conditions, in terms of injection flow rate, grout viscosity, soil intrinsic permeability and retention curve, under which the analytical solutions provide reliable results. The numerical results have been compared with the simplified analytical solution herein derived for a 1D spherical geometry, in terms of the “characteristic curves” for the system: the relationship between injection pressure/grout front advancement and injection time.","PeriodicalId":51705,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Ground Improvement","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76841528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Evaluating improved moduli of geogrid-stabilised sandy soil with a deflectometer 用偏转计评价土工格栅稳定砂土的改进模量

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2023-03-30 DOI: 10.1680/jgrim.22.00075

Sidhu Ramulu Duddu, Vamsi Kommanamanchi, Hariprasad Chennarapu, U. Balunaini

{"title":"Evaluating improved moduli of geogrid-stabilised sandy soil with a deflectometer","authors":"Sidhu Ramulu Duddu, Vamsi Kommanamanchi, Hariprasad Chennarapu, U. Balunaini","doi":"10.1680/jgrim.22.00075","DOIUrl":"https://doi.org/10.1680/jgrim.22.00075","url":null,"abstract":"Geogrid-stabilised soil has been widely adopted to enhance performance in transportation and infrastructure sectors. In a study, the performance of unstabilised and triaxial-geogrid-stabilised sandy soils in terms of dynamic deformation modulus and elastic modulus was measured using lightweight deflectometer test and plate load tests respectively. The objective of the study was to evaluate: (a) determination of dynamic deformation modulus of sandy soils with different relative compactions from deflectometer testing and compare with the elastic modulus of sandy soils from plate load tests for a given relative compaction of 97%; (b) determination of modulus improvement factors of triaxial-geogrid-stabilised sandy soils through extensive laboratory testing; and (c) demonstration of compaction quality control of well-graded gravel using deflectometer testing through a field study. The triaxial-geogrid-stabilised sandy soil layer showed modulus improvement factors of 1.51 and 1.37 obtained from deflectometer and plate tests corresponding to an embedded depth of 50 mm respectively. The percentage differences in these values are in the range of 4% to 9% for all the embedded depths. Hence a lightweight deflectometer can be used instead of a plate load test as a quick and low-cost alternative for determining the modulus improvement factor of geogrid-stabilised sand soil, both in the laboratory and in the field.","PeriodicalId":51705,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Ground Improvement","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75014736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical behavior of grouted sands with acrylates and polyurethane resins 丙烯酸酯和聚氨酯树脂灌浆砂的力学性能

IF 1.2

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2023-03-30 DOI: 10.1680/jgrim.23.00005

G. Spagnoli, S. Collico, Götz Tintelnot

引用次数: 1

Award-winning paper in 2021 2021年获奖论文

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2023-03-01 DOI: 10.1680/jgrim.2023.176.1.66

引用次数: 0