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soil fracturing
相关语句
  土体劈裂
     Analysis research on soil fracturing around deep mixing column
     深层搅拌桩周围土体劈裂的研究与分析
短句来源
  “soil fracturing”译为未确定词的双语例句
     (3) soil fracturing around column during mixing and expansion;
     (3)施工期间周围土体的劈裂;
短句来源
     An approach is proposed to analyse the soil fracturing due to tensile force.
     针对搅拌桩施工引起的周围土体的劈裂现象,提出了一种基于拉伸破坏原理的劈裂分析方法。
短句来源
  相似匹配句对
     Review on Computing Theories of Hydraulic Fracturing in Soil
     土体水力劈裂计算理论综述
     The Study of Hydraulic Fracturing on Compacted Cohesive Soil
     击实粘性土水力劈裂性能研究
短句来源
     M,soil nutrition.
     二等{NP,NPZnK,M};
短句来源
     ⑥soil.
     ⑥土壤因素。
短句来源
     Mechanism of repeated fracturing
     重复压裂机理研究
短句来源
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  soil fracturing
The intense abstraction from more than 50 wells located in Irapuato City, Mexico, is inducing soil fracturing.
      
Grout injection tests were performed to examine soil fracturing patterns and consolidation effects in relation to compensation grouting.
      
Bulk density; soil compaction; soil fracturing; air excavation; root growth.
      


Installation of displacement types of columns such as driven pile,sand compaction pile,lime compaction pile,and deep mixing column causes stress changes in the surrounding soil.The properties will change in surrounding soil.Strength of the surrounding soil will decrease,recover,and increase after column installation.The mechanisms of effects of deep mixing column installation on surrounding clay can be identified into seven categories:(1) disturbance or structure damage of soil surrounding the column due to...

Installation of displacement types of columns such as driven pile,sand compaction pile,lime compaction pile,and deep mixing column causes stress changes in the surrounding soil.The properties will change in surrounding soil.Strength of the surrounding soil will decrease,recover,and increase after column installation.The mechanisms of effects of deep mixing column installation on surrounding clay can be identified into seven categories:(1) disturbance or structure damage of soil surrounding the column due to blade mixing and expansion of admixture injection;(2) thixotropic behaviour of soft clay;(3) soil fracturing around column during mixing and expansion;(4) cement penetration and diffusion from column to surrounding soil through fractures and soil pores;(5) cementation due to increase of cation concentration in pore water;(6) consolidation effect due to increase of effective stress in surrounding soil after excess pore pressure dissipation;(7) heating caused by the chemical reaction of hydration and pozzolanic reaction.These influential factors were investigated through laboratory tests and theoretical analysis.Laboratory tests were performed to investigate the effects of soil thixotropy,soil fracturing,and cement penetration in soft Ariake clays.Theoretical analysis was employed to analyze the fracturing phenomenon.Fractures and cement penetration phenomenon were observed in laboratory test.For soft Ariake clay,test results show that strength due to thixotropic hardening regained completely within 70 days.Theoretical result shows that even in a very low admixture injection pressure,fracturing will occur in surrounding soil.

排土型桩如打入桩、砂桩、石灰桩以及深层搅拌桩等的施工都会引起桩周围土体的应力变化,因此周围土体的性质也将发生变化。施工完成后,周围土体的强度将经历下降、恢复和增长的过程。深层搅拌桩施工对周围土体的作用可以归纳为以下7个方面:(1)叶片的搅拌和固化剂的注入对周围土体的扰动作用;(2)软粘土的触变性;(3)施工期间周围土体的劈裂;(4)桩身水泥浆通过劈裂裂缝向周围土体中流入及由扩散作用渗入到土的孔隙中;(5)孔隙水中钙离子浓度增加引起的胶结作用;(6)超静孔隙水压力消散引起的固结作用;(7)水和作用和火山灰反应等化学作用产生的热作用。通过室内试验和理论分析来研究这些影响因素。室内试验主要研究土的触变性、土的劈裂和水泥浆扩散对软弱有明粘土的影响。理论分析则解释了土体的劈裂现象。室内试验可以直接观测到土体劈裂和水泥浆扩散现象。对于软弱有明粘土,试验结果显示周围土体的强度在70d内由触变性得到恢复。理论分析发现即使在很小的固化剂注入压力作用下,周围土体也会发生劈裂现象。

Field investigation has shown that the excess pore water pressure induced by deep mixing column installation may be higher than the hydraulic fracturing pressure.The interaction behavior between the deep mixing column and the surrounding soil can be simulated as the shearing-expanding process of a cylindrical cavity.An approach is proposed to analyse the soil fracturing due to tensile force.Analytical results indicate that the rotation of the mixing blades has a significant effect on the clay fracturing...

Field investigation has shown that the excess pore water pressure induced by deep mixing column installation may be higher than the hydraulic fracturing pressure.The interaction behavior between the deep mixing column and the surrounding soil can be simulated as the shearing-expanding process of a cylindrical cavity.An approach is proposed to analyse the soil fracturing due to tensile force.Analytical results indicate that the rotation of the mixing blades has a significant effect on the clay fracturing in a close region around the column.The proposed method has been verified against laboratory test.Fracturing cracks have two functions: firstly,cement slurry can flow into the fracturing crack;secondly,excess pore pressure may dissipate through fractures.These two effects speed up the strength recovery of the surrounding soil.

现场测试结果表明:深层搅拌桩施工可以在周围土体中产生很高的超静孔隙水压力,其量值可能超过土体的静水劈裂压力。搅拌桩施工时和周围土体的相互作用可以用受剪的孔穴扩张过程来模拟。针对搅拌桩施工引起的周围土体的劈裂现象,提出了一种基于拉伸破坏原理的劈裂分析方法。分析结果表明:搅拌叶片的旋转对桩周围土体的劈裂起着很重要的作用。通过室内模型桩打设试验可以观测到搅拌桩周围土体的劈裂现象。分析现场搅拌桩施工时桩周土体中的孔隙水压力测试结果,表明现场施工可以引起劈裂。劈裂裂缝对于搅拌桩的性状有如下两方面的正面作用д其一,水泥浆体可以流入劈裂裂缝;其二,超静孔隙水压可以通过劈裂裂缝快速消散。这两者的作用加快了受扰动的周围土体的强度恢复。

A simulative analysis coupled with experiment on behaviors of a soil bed cut by a model bulldozer blade is carried out using the finite element/distinct element method(FE/DEM) facility built in the ELFEN package. Before simulation,the soil specimens are examined through uniaxial tensile/compression,triaxial compression and direct shear tests to obtain model characteristics and relevant parameters,then soil cutting experiments are carried out via a mini-soil bin system with a soil bed of 60/120 mm in width and...

A simulative analysis coupled with experiment on behaviors of a soil bed cut by a model bulldozer blade is carried out using the finite element/distinct element method(FE/DEM) facility built in the ELFEN package. Before simulation,the soil specimens are examined through uniaxial tensile/compression,triaxial compression and direct shear tests to obtain model characteristics and relevant parameters,then soil cutting experiments are carried out via a mini-soil bin system with a soil bed of 60/120 mm in width and 10 mm in depth cut by a 1/9 scale model bulldozer blade moving with the velocity of 10 mm/s. The soil constitutive model includes the tensile elastic model for tensile breakage and the compressive elastoplastic relationship with Mohr-Coulomb criterion. The cutting length in simulation is set as 1/4 of that in the experiment divided into 1 869 triangular elements. The comparison between the simulated results and experimental ones shows that the used model is capable of analyzing soil dynamic behaviors qualitatively,and the predicted fracturing profiles in general conform to the experiment. Hence the feasibility for analyzing soil fracturing behaviors in tillage or other similar processes is validated.

A simulative analysis coupled with experiment on behaviors of a soil bed cut by a model bulldozer blade is carried out using the finite element/distinct element method(FE/DEM) facility built in the ELFEN package. Before simulation,the soil specimens are examined through uniaxial tensile/compression,triaxial compression and direct shear tests to obtain model characteristics and relevant parameters,then soil cutting experiments are carried out via a mini-soil bin system with a soil bed of 60/120 mm in width a...

A simulative analysis coupled with experiment on behaviors of a soil bed cut by a model bulldozer blade is carried out using the finite element/distinct element method(FE/DEM) facility built in the ELFEN package. Before simulation,the soil specimens are examined through uniaxial tensile/compression,triaxial compression and direct shear tests to obtain model characteristics and relevant parameters,then soil cutting experiments are carried out via a mini-soil bin system with a soil bed of 60/120 mm in width and 10 mm in depth cut by a 1/9 scale model bulldozer blade moving with the velocity of 10 mm/s. The soil constitutive model includes the tensile elastic model for tensile breakage and the compressive elastoplastic relationship with Mohr-Coulomb criterion. The cutting length in simulation is set as 1/4 of that in the experiment divided into 1 869 triangular elements. The comparison between the simulated results and experimental ones shows that the used model is capable of analyzing soil dynamic behaviors qualitatively,and the predicted fracturing profiles in general conform to the experiment. Hence the feasibility for analyzing soil fracturing behaviors in tillage or other similar processes is validated.

 
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