SU1451215A1

SU1451215A1 - Method and pressiometer for pressiometric testing

Info

Publication number: SU1451215A1
Application number: SU874186095A
Authority: SU
Inventors: Евгений Леонардович Пылаев; Алексей Иванович Зюзин; Петр Васильевич Кирдин; Владимир Вениаминович Лушников
Priority date: 1987-01-28
Filing date: 1987-01-28
Publication date: 1989-01-15

Abstract

Изобретение относитс к области инженерно-геологических исследований при строительстве. Цель изобретени - повышение точности определени характеристик грунта путем обеспечени условий плоской деформации. В процессе нагружени стенок скважины при прессиометрических испытани х увеличивают площадь нагружаемой поверхности грунта или поддерживают ее посто нной , соответственно увеличива или уменьша длину рабочей части камеры прес- сиометра пропорционально увеличению диаметра скважины. Прессиометр дл осуществлени способа, содержащий камеру 1 с эластичной оболочкой 3,верхним 4 и нижним 5 фланцами, снабжен двусторонним гидроцилиндром 7, щтоки 10 которого св заны с фланцами 4 и 5, и датчиком 11 дл измерени длины камеры 1. Длину камеры 1 измен ют в процессе испытаний путем подачи масла в гидроцилиндр 7, раздвигающий верхний 4 и нижний 5 фланцы, на которых закреплена эластична оболочка 3. 2 с.п. ф-лы 2 ил.The invention relates to the field of geotechnical research in construction. The purpose of the invention is to improve the accuracy of determining the characteristics of the soil by providing the conditions of plane deformation. In the process of loading the borehole walls during pressure testing, the area of the loaded soil surface increases or is kept constant, respectively, increasing or decreasing the length of the working part of the pressure meter chamber in proportion to the increase in the borehole diameter. A pressiometer for carrying out the method comprising a chamber 1 with an elastic shell 3, upper 4 and lower 5 flanges, is provided with a double-sided hydraulic cylinder 7, the rods 10 of which are connected to flanges 4 and 5, and a sensor 11 for measuring the length of chamber 1. The length of chamber 1 varies in the process of testing by supplying oil to the hydraulic cylinder 7, pushing the upper 4 and lower 5 flanges, on which the elastic sheath 3 is fixed. 2 p. f-ly 2 ill.

Description

Фае. 2Faye. 2

Claims

Claim

1. 'The method of pressiometric soil tests, including installing a pressiometer in the well, loading its walls with steps of increasing pressure, measuring radial movements of the soil and the diameter of the well withstanding each pressure stage to stabilize the movement of the soil and determining its characteristics, characterized in that, in order to increase the accuracy of determining the characteristics of the soil by ensuring conditions of flat deformation; during loading, increase the area of the loaded surface of the soil or support t its constant pu5 the correspondingly increase or decrease the length of the working part pressuremeter chamber proportionally increase the borehole diameter.

2. pressuremeter comprising a working chamber with the upper and lower flanges and the ELAS-particle ^and shell pressure source, the radial displacement sensors membrane and measuring and recording devices, characterized in that, in order to increase the accuracy of determining characteristics of the ground plane 15 by providing strain conditions, the chamber is equipped with a two-sided hydraulic cylinder, the rods of which are connected with the upper and lower flanges and sensors for measuring its current length.

Fie. 2