SU1534143A1 - Method of determining soil resistance at lateral surface and point of a pile - Google Patents

Abstract

The invention relates to construction and can be used to determine the bearing capacity of a pile. The aim of the invention is to improve the accuracy of determination by taking into account the natural stress state of the soil. To do this, a probe is pressed into the natural soil mass under field conditions with simultaneous measurement of the soil resistance under the probe cone and along its lateral surface, a soil sample is taken, which is placed in a stand. Vertical pressure is applied to the ground while simultaneously pressing the same probe into the ground, which was used in field conditions, and determining the soil resistance under the probe cone. Then horizontal normal stresses are applied to the soil model with simultaneous pressing of the probe and measuring the resistance of the soil along its lateral surface. Thereafter, a pile-stamp is pressed into the ground with a cross-section equal to the cross-sectional size of the natural pile, with simultaneous measurement of the soil resistance along the lateral surface and the edge of the pile-stamp. Horizontal and vertical crimping of the soil sample is carried out until the moment of equal resistance of the soil under the probe cone and along its lateral surface in laboratory and field conditions.

Description

The invention relates to construction and can be used to assess the bearing capacity of piles.

The aim of the invention is to improve the accuracy of determination by taking into account the natural stress of the co-; that neither the ground.

The method is implemented as follows.

Under field conditions, the probe is pushed into the soil mass and measured continuously or intervalwise at a certain distance along the depth of the soil resistance under the probe cone qe. . and in its lateral position 1

f S surfaces (n, A at the test site take a soil sample, which is placed in a stand equipped with devices for horizontal and vertical reduction of the soil base model. Vertical pressure is applied to the ground while simultaneously pressing

by grounding the same probe that was used in field conditions and determining the soil resistance under the probe cone qg (/, wff; and the vertical loading (reduction) of the soil is performed until the condition: soil resistance under probe cone according to field test data qs. vl) and soil resistance under the probe cone in the q, g laboratory. must be equal to qs (neA, qs (, a6) Then horizontal normal voltages are applied to the soil model with simultaneous pressing of the probe and measuring the resistance of the soil along the lateral surface of the probe g3 (la)) and under the probe cone h s („„ $) This horizontal loading (crimping} with simultaneous adjustment of the vertical pressure is carried out until the following conditions are met: the equality of the soil resistances both on the lateral surface and under the probe cone, both in field conditions and in laboratory conditions (f5 ( ftao)

 fB (noA) Ch5 (L 6.1 Chuspol))

After setting the model of a natural base of the natural stress state, the pile is pressed into the soil — a stamp with a cross section equal to the cross-section size of the natural pile, with simultaneous measurement of soil resistance along the lateral surface f; the tip R of the pile stamp, which is equal to the corresponding values of f, and R of the pile in the considered i-th layer of the soil mass of the construction site. Modeler

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the natural resistance of the soil to the immersion of the probe in laboratory conditions in different 1 layers of the soil mass, successively repeating the indicated operations, determine the values of f- and R for the pile for different depths of the soil mass,

Claims (1)

Invention Formula The method of determining the soil resistance along the lateral surface and the tip of the Svan by pressing the probe into the soil array and measuring the soil resistance along the lateral surface and under the probe cone, characterized in that, in order to improve the accuracy of determination by taking into account the natural stress state of the soil, the soil sample at the point of sounding compresses it with vertical and horizontal pressure with simultaneous immersion of the probe and measurement of the soil resistance along the lateral 1 surface and under the probe cone, the original soil is compressed by vertical pressure until the condition of equality {resistance of the soil under the probe cone under laboratory conditions and in the massif is satisfied, and then horizontal until the condition of equality of the resistance of the soil along the lateral surface is fulfilled in the laboratory conditions and massif The compacted soil sample is piled-stamped and the soil resistances are measured along its lateral surface and point.