Model tests for observing the deformation characteristics of micropile boreholes during drilling in a soil-limestone mixture

Ying, Chunye; Hu, Xinli; Siddiqua, Sumi; Makeen, Gehad Mohamed Hossam; Xia, Peng; Xu, Chu; Wang, Qiang

doi:10.1007/s10064-021-02319-x

Cited by 6 publications

(5 citation statements)

References 69 publications

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“…When water was used to form the boreholes, noticeable negative displacement areas were found to appear in the lower part of the borehole ( Figure 9 a). As previously analyzed by Ying et al [ 22 ], the negative displacement area indicated movement towards the borehole. In contrast, only positive displacement induced by drilling was observed as polymer fluid was used ( Figure 9 b).…”

Section: Discussionmentioning

confidence: 57%

“…A model test platform, developed by Ying et al [ 22 ], configured with multiple sensors ( Figure 7 ), i.e., vertical displacement sensors, flexible inclinometers, pore water gauges, and soil pressure cells, was used to verify the polymer fluid formula to drill into a soil–limestone mixture. A detailed description of the platform can be seen in their work [ 22 ]. The above-mentioned human-made soil–limestone mixture was used to construct the model.…”

Section: Discussionmentioning

confidence: 99%

“…A human-made soil–limestone mixture developed by Ying et al [ 22 ] was utilized. The physical properties of the mixture are summarized in Table 1 .…”

Section: Methodsmentioning

confidence: 99%

“…The fine particles were silty clay, and the gravelly component of the mixture was fresh (nonweathered) limestone fragments. A detailed description and the mineral composition of the mixture can be seen in their work [ 22 ].…”

Section: Methodsmentioning

confidence: 99%

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Design and Evaluation of a Polymer Support Fluid in a Soil–Rock Mixture

Ying

Xia

et al. 2022

Polymers

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Soil–rock mixtures are commonly encountered in the construction of bored piles. Conventional bentonite support fluids have disadvantages, such as more significant environmental impacts, more complex mixing, bigger site footprint, weaker foundation performance, and overall low economies. The present study conducted a comprehensive investigation of partially hydrolyzed polyacrylamide (PHPA) polymer fluids, an alternative to bentonite ones, to drill into a soil-limestone mixture. The fluid flow pattern, aging behavior, and the influence of finer silty clay on polymer fluid were explored. The test results showed that polymer fluids were reasonably well fitted to the power-law model and were a good alternative to the conventional bentonite ones. In terms of their aging behavior, the remaining active viscosity of the polymer was at least 70% after a prolonged aging time of up to 30 days, showing the effective on-site use of polymer fluids. The mixing of silty clay significantly reduced the apparent viscosity of polymer fluids, with 10% silty clay causing a viscosity reduction of 76%, indicating the importance of fluid control in drilling these materials. A polymer formula, water + 0.08%PHPA + 0.1~0.5%Na2CO3, was proposed and was verified by drilling into a soil–limestone mixture. The polymer fluids led to small radial displacements around the boreholes with a high drilling quality. This work would be helpful for consultants and contractors designing and constructing bored piles in soil and rock mixtures utilizing polymer fluids.

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Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 99%

“…A human-made soil–limestone mixture developed by Ying et al [ 22 ] was utilized. The physical properties of the mixture are summarized in Table 1 .…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Design and Evaluation of a Polymer Support Fluid in a Soil–Rock Mixture

Ying

Xia

et al. 2022

Polymers

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“…Kyung and Lee [31,32] investigated the uplift bearing characteristics of inclined micro-single piles and group piles by indoor sand model test, and found that the uplift force decreases with the uplift displacement and increases with the pile embedment angle, and proposed the distribution ratio of axial and lateral loads. Ying et al [33] investigated the correlation between borehole diameter and vertical displacement, radial displacement, and earth pressure on the surface of mixed limestone and soil foundations, and found that borehole diameter was positively correlated with displacement and earth pressure. Gupta and Chawla [34] investigated the effect of micro-pile diameter, length, spacing and inclination angle on the reinforcement of railway subgrade by numerical simulation and concluded that micro-pile is an effective method for reinforcing the existing railway track.…”

Section: Introductionmentioning

confidence: 99%

Study on Anti-Uplift Effect of Micro-Steel-Pipe Pile on Red-Bedded Soft Rock Subgrade

et al. 2022

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To investigate the treatment effect of micro-piles on uplift deformation of red-bedded soft rock subgrade, an in-situ static load test of slurry injected steel pipe micro-piles with different length was carried out, the uplift bearing capacity and deformation characteristics of micro-piles were analyzed, and the load transfer function of pile lateral friction resistance was modified with the consideration of pile length. A numerical simulation method considering the variable shear stiffness at the pile-soil interface was established, and the inversion of the relevant material parameters was carried out based on the in-situ test results. Through numerical simulation, the effect of single piles with different pile lengths and group piles with different pile spacing on the treatment of the uplift deformation of the subgrade was investigated. Finally, the anti-uplift design method of micro-piles in red-bedded soft rock was proposed. The results show that the uplift bearing capacity increased nonlinearly with the increase in pile length, and the variation curve of pile lateral friction resistance with pile-soil relative displacement showed a hardened type. The predicted pile lateral friction resistance shows a good correlation with the measured result; all the correlation coefficients were greater than 0.81. The uplift deformation of subgrade without piles was radially distributed with the maximum value of 5.12 mm as the center. A single micro-pile with a length of 7 m or a rectangular array of group piles with a length of 7 m and a spacing of 3D could effectively decrease the maximum uplift deformation to less than 4.0 mm, which can meet the requirement of specification. Thus, the micro-piles could be used for controlling the uplift deformation of red-bedded soft rock subgrade, and this study can provide a reference for anti-uplift design in the distributed area of red-bedded soft rock.

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Landslide Research and Technology in Patent Documents

Mikoš

2023

Progress in Landslide Research and Technology, Volume 1 Issue 2, 2022

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Science, Technology, and Innovation play a crucial role in the Sendai Framework for Disaster Risk Reduction 2015–2030 (SF DRR). The International Consortium on Landslides (ICL) initiated the Sendai Landslide Partnerships 2015–2025 as a voluntary commitment to SF DRR. In 2020, the ICL launched the Kyoto 2020 Commitment for Global Promotion of Understanding and Reducing Landslide Disaster Risk (KLC 2020) as a follow-up of the Sendai Landslide Partnerships 2015–2025. Closely related to the above-mentioned Innovation are patents as a form of intellectual property rights and are often used as an innovation assessment parameter. This article reports on a study conducted to look at the patent documents that are available in open-access databases in order to evaluate how well they relate to the field of landslide research and technology. Landslide-related patent documents were extracted using different search terms in the patent document titles, abstracts, claims and/or their general text from the Google Patents, using the Espacenet tools from the European Patent Office, and the Derwent Patent Index inside the Web of Science offered by Clarivate Analytics, respectively. The extracted patent documents were analyzed with regard to the applicant respectively inventor affiliation (academic, non-academic, country of affiliation) and to the technical field of a patent using well-known patent classifications. The most active countries claiming landslide-related patents were recognized. Furthermore, review and research articles in SpringerLink and SCOPUS databases were searched to study how often scientific articles are citing landslide-related patents. The results of the study can be summarized as follow: (i) in the Google Patents database there are 15,000 + landslide-related patent documents, and in the Espacenet and the Derwent Innovation index database 5000+, respectively. In the patents titles, abstracts, and claims, processes are more often used to describe the patent than the technology; (ii) the number of technological (non-science) based patents is higher than that of academic (science-based) patents, with some specific field of applications, where the situation is the opposite; (iii) with regard to the different areas of technology to which landslide-related patent documents pertain, the categories “G-Physics” and “E-Fixed constructions” are clearly prevailing: “G” for debris flows and landslides, and “E” for fallings rocks and mudflows; (iv) the majority of landslide-related patents are filled and/or granted in China, followed by Japan and South Korea, USA and EU member countries—five major emerging economies (called BRICS) are outperforming developed countries, with a very prevailing Chinese contribution; (v) only a fraction of the order of a few one-in-thousands of landslide-related patents documents are cited in journal review and research articles.

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Model tests for observing the deformation characteristics of micropile boreholes during drilling in a soil-limestone mixture

Cited by 6 publications

References 69 publications

Design and Evaluation of a Polymer Support Fluid in a Soil–Rock Mixture

Design and Evaluation of a Polymer Support Fluid in a Soil–Rock Mixture

Study on Anti-Uplift Effect of Micro-Steel-Pipe Pile on Red-Bedded Soft Rock Subgrade

Landslide Research and Technology in Patent Documents

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