Experimental and laboratory assessment of clogging potential based on adhesion

Basmenj, Amir Khabbazi; Ghafoori, Mohammad; Azali, Sadegh Tarigh; Cheshomi, Akbar

doi:10.1007/s10064-017-1044-1

Cited by 19 publications

(8 citation statements)

References 18 publications

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“…In severe cases, the increase of rotation torque of the cutter head can result in a significant fluctuation of shield parameters, blocking of mud pipes, and so on, affecting the safety and efficiency of construction [8][9][10][11]. Therefore, the soil adhesion on the cutter surface is one of the important reasons for the occurrence of the mud cake [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Adhesion Characteristics of Clay to Structures with Different Materials

Qiu

Zhang

2021

Geofluids

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When the shield machine passes through the clay layer, the clay debris cut by the cutter head usually adheres to the surface of the cutter head and is easy to form mud cakes after extrusion, which affects the safety and efficiency of construction. For the structure made of different materials, due to the different surface properties, the adhesion characteristics of clay are also different. So, selecting proper materials for the soil contacting parts in the shield machine can effectively reduce the adhesion between the structure and soil, decrease the clay adhering to the surface of the shield cutter, and reduce the possibility of further productions of mud cake. Therefore, studying the adhesion properties of clay to different materials and understanding the adhesion rule of clay to soil contacting structures are of guiding significance when selecting the materials of soil contacting parts. In this paper, the adhesion properties of cohesive soil to commonly used construction materials were studied by a self-made adhesion test device, including steel, iron, copper, aluminum, and engineering plastics (polyamide). According to the findings, the separation process of adhesion between soil and the structure by an external force can be divided into four stages, which are the adhesive elastic development stage, adhesive plastic development stage, failure stage, and detachment stage. The adhesion forces and the amount of soil adhered to the structures made of the selected materials are found to vary from each other. The adhesion forces ranked from high to low are, respectively, found on the iron, plastic, aluminum, steel, and copper surfaces. The material with the most amount of adherent soil is aluminum, followed by iron, steel, copper, and plastic.

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Section: Introductionmentioning

confidence: 99%

Experimental Research on the Adhesion Characteristics of Clay to Structures with Different Materials

Qiu

Zhang

2021

Geofluids

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“…Previous studies on shield tunnel construction in sandy gravel strata have mainly focused on cutter head wear and TBM selection (Bai and Su, 2012;Thewes and Hollmann, 2016;Zumsteg et al, 2016;Bai and Shi, 2017;Bai et al, 2020). The deformation of sandy gravel stratum induced by shield tunnel construction and the stability are less studied (Bai et al, 2014;Khabbazi et al, 2019;Yang and Bai, 2019). In addition, many discussions in recent years have indicated that the temperatures of shield cutter heads are generally 40-50 °C under normal working conditions.…”

Section: Introductionmentioning

confidence: 99%

Disturbance Process of Sandy Gravel Stratum Caused by Shield Tunneling and Ground Settlement Analysis

et al. 2021

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This paper analyzed the earth pressure, pore pressure, and surface settlement of the Luoyang urban rail transit tunnel in a sandy gravel stratum (Henan Province, China) under different burial depths by using field measurement methods. The results showed that the earth pressure as well as pore pressure of the soil layer above the working surface increased sharply and reached their maximum values when the cutter head of the shield gradually crossed the working surface. During the completion of synchronous grouting, the earth pressure and pore pressure increased slightly; when shield tunneling passed through the working surface, the earth pressure is smaller than the original earth pressure due to the unloading effect. The surface settlement curve above the tunnel took on a “V” shape after the completion of the left-side tunnel excavation, conforming to the normal distribution pattern. The surface settlement curve above the two tunnels took on a “W” shape after the completion of the right-side tunnel excavation, which is in good agreement with the proposed theoretical calculations. The findings of this study can help for better understanding the control of safety risk during shield construction.

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“…The clay debris cutoff will adhere to the surface of the cutter head when the shield cutter head passes through the clay layer and forms solid or semisolid masses by the compaction of cutter head, then sticks to the cutter head and blocks it decreasing the penetration so that the efficiency of shield excavation reduces [1][2][3][4]. The adhesion of soil is one of the important reasons for the formation of mud cake on the surface of the cutter head [5][6][7][8][9][10]. The existence of mud cake will not only lead to the increase of the torque of the shield cutter, but also block the suction opening of the slurry discharge pipe, which will seriously affect the shield construction technology and construction safety.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Impact of Temperature on the Adhesion Characteristics of Soil-Structure Interface

et al. 2020

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Under the working condition of mud cake, the continuous action between the shield cutter head and the soil on the excavation surface can generate high temperature in the process of shield tunneling and excavation, which changes the characteristic of the adhesion between the soil and the cutter head to intensify the phenomenon of making a mud cake on cutter, finally leading to a vicious circle. To study the effect of temperature on the characteristics of the adhesion of the soil on the surface of the structure, the soil adhesive situation and adhesion force at different interface temperatures were tested through a self-made experiment device. According to the result, it was indicated that the moisture content has a significant effect on the adhesion force of the soil, and the adhesion force firstly increased and then decreased with the increased of the moisture content and reached the maximum value near the plastic limit moisture content. The adhesion force changes very gently when the interface temperature is low. When the temperature reached 50°C, the adhesion force continues to increase as the interface temperature continuously increases except for the soils with high moisture content; moreover, the interface temperature has a great influence on the content of soil adhered on the structure surface. As for the soil with moderate moisture content ( ω = 21.21 ~ 31 %), this content of the adhered soil increased exponentially with the increase of interface temperature; this content firstly decreased and then increased when the moisture content was high. When the soil was dry, there was almost no adhered soil on the surface and the interface temperature had no effect on the adhesive situation. By comparing and analyzing the adhesion state of the soil on the surface of the structure, the influence of temperature on the adhesion characteristics is mainly reflected on the variation of the soil moisture content within the influence range of the interface, the variation of the energy required for the destruction of the adhesion interface, and the change of the location of the weakest antistripping plane induced by both before. This research can better understand the law of formation and development of mud cakes and provided a new idea of solving the problem of mud cakes on the cutter head.

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Experimental and laboratory assessment of clogging potential based on adhesion

Cited by 19 publications

References 18 publications

Experimental Research on the Adhesion Characteristics of Clay to Structures with Different Materials

Experimental Research on the Adhesion Characteristics of Clay to Structures with Different Materials

Disturbance Process of Sandy Gravel Stratum Caused by Shield Tunneling and Ground Settlement Analysis

Experimental Research on the Impact of Temperature on the Adhesion Characteristics of Soil-Structure Interface

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