SU767277A1

SU767277A1 - Device for determining mechanical properties of soil

Info

Publication number: SU767277A1
Application number: SU782697500A
Authority: SU
Inventors: Николай Николаевич Фролов; Виктор Асафович Докин; Евгений Асафович Докин
Original assignee: Московский гидромелиоративный институт
Priority date: 1978-12-15
Filing date: 1978-12-15
Publication date: 1980-09-30

Description

(54) УСТРОЙСТВО ДЛЯ ОПРЕДЕЛЕНИЯ МЕХАНИЧЕСКИХ (54) DEVICE FOR DETERMINING MECHANICAL

Изобретение относитс к исследовани м физико-механических свойств грунтов в строительстве.The invention relates to the study of the physicomechanical properties of soils in construction.

Наиболее близким к предлагаемому в- л етс устройство дл определени механических свойств грунтов, включающее цилиндрический корпус, размещенные в Ней концентрично относительно друг друга, камеру давлени , имеющую эластичную бболочку и камеру испытани грунта с верхним и нижним перфорированными штампами , измерительные приборы и источник давлени Щ.The closest to the proposed device is a device for determining the mechanical properties of soils, including a cylindrical body placed concentrically relative to each other in it, a pressure chamber having an elastic cylinder and a soil test chamber with upper and lower punched dies, measuring instruments and a pressure source Sch .

Основным недостатком этого устройства вл етс то, что оно не позвол ет проводить испытани образцов грунта в услови х близких к естественным,так Как развитие бокового давлени в процессе деформации выражаетс сложной функцией и воссоздать ее в опыте практически невозможно.The main disadvantage of this device is that it does not allow testing of soil samples under conditions close to natural, since the development of lateral pressure in the deformation process is expressed by a complex function and it is almost impossible to recreate it in the experiment.

Цель изобретени - повышение точности измерений путем моделировани горизонтальной составл юшей деформируемости массива грунта.The purpose of the invention is to improve the accuracy of measurements by modeling the horizontal composition of the deformability of the soil mass.

Поставленна цель достигаетс тем, что в устройство дл определени механических свойств грунтов, включающее цилиндСВОЙСТВ ГРУНТОВThe goal is achieved by the fact that the device for determining the mechanical properties of soils, including the cylinder properties of soils

рический корпус, размещенные в нем концентрично относительно друг друга камеру давлени с эластичной оболочкой, и ка Мёруйспь ани грунта с верхним и нижним перфорированными штампами, измерительные приборы и источник давлени , выполнено с дополнительной камерой испытани грунта, образованной внутренней стенкой корпуса и внешней стенкой камеры давлени , выполненной, в свою очередь составной из продольных секций, св занных между собой, причем эластичные стенки смежных секций обращены в противоположные стороны.The enclosure located concentrically relative to each other is a pressure chamber with an elastic casing, and a Moorai sp'i primer with upper and lower perforated dies, gauges and pressure source, is made with an additional soil test chamber formed by the inner wall of the enclosure and the outer wall of the pressure chamber made, in turn, of the composite of the longitudinal sections connected to each other, with the elastic walls of adjacent sections facing in opposite directions.

На фиг. 1 схематически изображено предлагаемое устройство, поперечный разрез; на фиг. 2 - разрез А-А н,а фиг. 1. FIG. 1 shows schematically the proposed device, a cross-section; in fig. 2 shows a section A-A n and FIG. one.

15 Устройство включает исследуемый образец I, помещенный в жесткий цилиндр 2. Дл уменьшени трени образца 1 о Стенки :циЛйндра 2 установлена прокладка 3. Образец обжат сверху подвижным15 The device includes the test sample I placed in a rigid cylinder 2. To reduce the friction of sample 1 o Walls: cylinder 2 a gasket 3 is installed. The sample is crimped from above with a movable

Claims

20 with a die 4, and from below with a transverse die 5. The elastic walls 6 of the chambers 7 are facing the inside of the sample, and the chambers 8 are facing out. To reduce friction of the ground against the walls of chambers 7 and 8, gaskets 9 are installed. Chambers 7 are connected to chamber 8 by pipeline 10. Pressure sensor 11 and flow meter 12 are mounted on line -10, chambers 7 and 8 are filled with liquid. The device works as follows. . . L A cylindrical sample of the soil is traced between two horizontal PAs of the Grouting and Moving vertical lines perforated with respect to each other. Cameras are installed vertically inside the sample around the circumference. In neighboring Hbie resilient, the Tensions are directed in opposite directions. In the process of deforming the sample, excess liquid (due to the development of lateral deformations) from the chamber with an elastic wall facing the inside of the sample shrivels into the cd merus with an elastic shell facing the outside of the sample and deforms the surrounding one. : during the test, a sample of soil 17, through the upper plug 4, is compressed with a predetermined pressure P. As a result of lateral spread occurring inside the sample, Truth presses on the elastic walls 6 of chambers 7 and 8, Under the action of this pressure L TH, which is detected by sensor 11, liquid pipeline 10 moves from chambers 7 to chambers 8. The volume of displaced fluid is recorded by the flow meter 12. The device allows testing of the soil taking into account the lateral flow rate of the soil TB, measuring the magnitude and development of the TT &p; rizongalnogo pressure under conditions of deformation of the soil, taking into account the compliance of the surrounding array of soil. The results of deformations and pressures obtained using the device make it possible to correct the calculations of the foundations of structures, making them more reliable and comparable with field observations. Apparatus for determining the mechanical properties of soils, including a cylindrical body, a pressure chamber with an elastic wall and a soil test chamber with upper and lower punched dies, measuring instruments and a pressure source, which are designed to increase accuracy measurements by simulating the horizontal component of the deformability of the soil mass, it is performed with an additional soil test chamber formed by the morning wall of the housing and the outer wall of the pressure chamber, which is, in turn, composed of longitudinal sections interconnected, with the elastic walls of the adjacent sections facing in opposite directions. Sources of information taken into account in the examination 1. Sidorov N. N. and others. “Modern Hbie methods for determining the characteristics of the mechanical properties of soils. L., publishing house of literature on construction, 1972 (prototype).