Earth mass stillness lateral-compression coefficient determinator

Abstract

The invention provides an earth mass stillness lateral-compression coefficient determinator which comprises a pressure chamber, a loading device and a measurement control device, wherein the loading device is arranged on the top or bottom of the pressure chamber; the pressure chamber comprises a base, a bottom plate and a supporting pad which are arranged on the base, a sample drum arranged on the supporting pad, an upper pressure plate matched with the top opening of the sample drum, and a pressurization cover plate and a loading sensor which are successively arranged on the upper pressure plate from top to bottom; the bottom plate is a rounded bottom plate composed of two hemicycle metal plates with same semidiameter, and the sample drum is composed of two semicircle drums on the outer side wall of the sample drum and is connected with the two semicircle drums through at least two pairs of pull pressure sensors; the upper pressure plate is composed of a hemicycle metal plate; and the signal interface of a measurement control device is respectively connected with the loading device, the loading sensor and the pull pressure sensor, the measurement control device outputs a signal to the loading device, and the loading sensor and the pull pressure sensor output signals to the measurement control device. The determinator provided by the invention has the advantages of simple structure and wide application range.

Description

technical field [0001] The invention belongs to the field of soil parameter measuring equipment, in particular to a measuring instrument for static lateral pressure coefficient of soil. Background technique [0002] The static lateral pressure coefficient refers to the ratio of the horizontal principal stress to the vertical principal stress of the soil after compression without lateral deformation, that is, the ratio of the horizontal principal stress to the vertical principal stress in the original stress state. It is a very important parameter in soil engineering, and its practical application range is wider and wider. For example, determining the stress state in a horizontal site, calculating static earth pressure, pore water pressure during earth dam construction, and lateral friction of piles need to be accurately measured. Static side pressure coefficient. [0003] There are roughly two existing indoor methods for measuring the static lateral pressure coefficient of ...

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Problems solved by technology

The side walls of the above two measurement methods are all rubber membranes, and the measurement results of the static side pressure coefficient of saturated clayey soil and sandy soil are more accurate. The membrane is a variable soft structure, axially compressed, and the pores on the side of the coarse-grained soil are embedded by the soft sidewall rubber membrane, which makes it impossible to guarantee the condition of no lateral deformation. Therefore, the static side pressure for coarse-grained soil Unreliable coefficient determination

There is no reliable method for measuring the static lateral pressure coefficient of coarse-grained soil

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