Determination of coarse-grained soil k 0 value of large k 0 Consolidation instrument

Abstract

The invention relates to a large-scale K0 consolidometer of measuring a coarse-grained soil K0 value. The consolidometer comprises a cylindrical container which is used for placing coarse-grained soil samples, wherein a base of the cylindrical container is fixed to a base plate, a compression system is arranged on the top end of the coarse-grained soil samples, a compression cover plate and a first porous plate are arranged between the compression system and the top end of the coarse-grained soil samples, and a plurality of permeable grooves are formed in the surface of the compression cover plate; a second porous plate is arranged between the bottom end of the coarse-grained soil samples and the base of the cylindrical container, meanwhile a plurality of permeable grooves are formed in the portion, close to the second porous plate, of one side of the base, three evenly distributed liquid pressure bags are embedded in the inner wall of the coarse-grained soil samples, the liquid pressure bags are connected with a burette and a hydraulic sensor through a three-way valve respectively, the K0 consolidometer further comprises a data collection system, and the hydraulic sensor and the compression system are connected with the data collection system simultaneously; according to the large-scale K0 consolidometer, the side liquid pressure bags and the hydraulic sensor which is connected with the three-way valve are adopted, and the size of lateral force can be measured quickly and precisely.

Description

technical field [0001] The invention relates to a method for measuring coarse-grained soil K 0 value of large K 0 The consolidation instrument belongs to the field of indoor rock and soil test research. Background technique [0002] The static lateral pressure coefficient of soil plays an important role in the study of soil deformation, static earth pressure of retaining structures, underground building enclosure structures, tunnel lining structures, and lateral friction calculations of piles. development, underground engineering and deep foundation pit engineering are gradually increasing, soil K 0 The selection of values ​​has received more and more attention. [0003] Static lateral pressure of soil (K 0 ) coefficient is an important elastic parameter in the soil, which can reflect the change of horizontal stress in the soil, and can also directly calculate the distribution of earth pressure acting on the retaining structure and the safety of the project. [0004] Ho...

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Problems solved by technology

[0004] However, in specific engineering applications, because the soil is affected by a series of complex factors (such as soil type, stress history, etc.), it is not yet possible to accurately calculate K based on empirical formulas. 0 coefficient, the test method is difficult to obtain the accurate and reliable static lateral pressure coefficient of the soil due to the influence of test instruments, test conditions and other factors. The traditional consolidation instrument method is used to determine K 0 coefficient, the horizontal stress cannot be accurately measured and there is residual strain in the ring body during the unloading process. At present, for K 0 The determination of the coefficient is mostly for fine-grained soil, and there is no report on a large-scale consolidation instrument that can measure the static lateral pressure coefficient of coarse-grained soil.

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