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Deep layer loading test timely testing device and method

A technology of load test and test device, which is applied in the direction of basic structure test, construction, and basic structure engineering, etc. It can solve the problems of reduced test accuracy, low displacement measurement accuracy, and low bearing capacity, so as to reduce human judgment errors and improve test performance. The effect of precision

Pending Publication Date: 2018-10-16
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the test is relatively intuitive and simple, it has been widely used for many years, but the use of this method has the following limitations: the impact depth range of the plate load test is not more than twice the width (or diameter) of the bearing plate, so it can only understand the shallow surface The characteristics of the foundation soil; the size of the bearing plate is smaller than the actual foundation, and the development of the plastic zone at the edge of the rigid plate is more likely to cause damage to the foundation and lower the estimated bearing capacity
However, the deep plate load test device has its disadvantages: (1) The displacement measurement accuracy is low, because the elastic deformation and bending of the force transmission column caused by ground loading, and the displacement and deformation of the reaction force system directly affect the bearing pressure. The measurement accuracy of the actual displacement of the plate, the ground readings cannot represent the displacement of the real load of the bearing plate; (2) The friction between the force transmission column and the hole wall prevents the ground applied load from being transmitted to the bearing plate; (3) The measurement accuracy of the above displacements and loads decreases with depth

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  • Deep layer loading test timely testing device and method

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Effect test

Embodiment 1

[0033] The timely testing device for the deep load test includes a loading system, a force transmission system and a testing system.

[0034] The loading system is realized by a surcharge counterweight 1 , a reference beam 2 is installed under the surcharge counterweight 1 , the reference beam 2 is supported on a support pier 4 , and the support pier 4 is supported on the surface of the foundation 16 .

[0035] The force transmission system includes a jack 3, a force transmission column 5, a backing plate 6, a pressure bearing plate 7, an end plate 8, a connecting rod 9, a pressure sensor 10, a pull-wire displacement gauge 11 and a displacement sensor 19, and the jack 3 is located on the front of the reference beam 2. On the backing plate 6 connected below, displacement sensors 19 are arranged on both sides above the backing plate 6, and the center of the backing plate 6 is provided with a small hole 20 for passing through the wire 13 of the displacement rod 12 and the pressure...

Embodiment 2

[0041] The method for testing the timely testing device of the deep layer load test comprises the following steps:

[0042] (1) Installation of deep load test device

[0043] Use mechanical drilling or manual digging to a predetermined depth, then connect and fix the pressure bearing plate 7, the end plate 8 of the force transmission column 5, the pressure sensor 10, the connecting rod 9, the displacement rod 12, and the pull-type displacement gauge 11 in sequence, and lift Go down to the bottom of the hole, and then set backfill soil 15 in the gap between the force transmission column 5 and the hole wall to ensure that the force transmission column 5 is vertical. Weld the backing plate 6 on the top of the force transmission column 5, install the jack 3, the support pier 4, and the reference beam 2, and use sand bags or concrete test blocks for counterweight. On the backing plate 6, the wire 13 of the pressure sensor 10 is passed out and connected to the data acquisition inst...

Embodiment 3

[0064] The Ningbo Rail Transit Fenghua Line project site is located in the Ningfeng Plain area, and its geotectonic location belongs to the Lishui-Ningbo uplift belt in the southeastern Zhejiang fold belt of the Caledonian fold system in South China. According to the regional geology and this exploration data, the strata of the proposed site belong to the southeast stratum area, and the pre-Quaternary strata within the exploration depth range are mainly Jurassic upper system (J3c) tuff. Quaternary strata are well developed, and the thickness varies greatly. The survey reveals that the thickness is about 32.6-47.0m. The strata are generally developed from the Middle Pleistocene to the Holocene, with many genetic types. The engineering geological characteristics of each engineering geological sublayer are reviewed as follows: ① 1b : plain fill (mlQ), ① 1c : Planting soil (mlQ), ① 2 Layer: silty clay (al-lQ43), ① 3c layer: silty clay (mQ34), ② 1 Layer: silty clay (al-lQ43), ② ...

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Abstract

The invention relates to a deep layer loading test timely testing device. The deep layer loading test timely testing device comprises a loading system, a force transmission system and a testing system. The loading system comprises a pile loading balance weight, a datum beam and support piers. The datum beam is arranged below the pile loading balance weight, the datum beam is borne on the support piers, and the support piers are borne on the surface of a foundation. The force transmission system comprises a jack, a force transmission column, a cushion plate, a pressure bearing plate, an end plate, a connecting rod, a pressure sensor, a stay wire type displacement meter and a displacement sensor. The testing system comprises the pressure sensor, the displacement sensor and the stay wire typedisplacement meter. The deep layer loading test timely testing device has the beneficial effects that two manners are adopted in the displacement of the pressure bearing plate; according to one manner, sedimentation of the force transmission column is directly measured on the ground surface; according to the other manner, a displacement rod and the stay wire type displacement meter are utilized for directly measuring the synchronous displacement of the pressure bearing plate; influences on the measuring precision from the hole depth are weak, and force transmission column elastic deformationcaused by ground loading and influences on displacement measurement from bending can be avoided.

Description

technical field [0001] The invention relates to a device and a test method for testing the bearing capacity of deep foundation soil, in particular to a timely test device and a test method for deep load tests. Background technique [0002] The construction safety of high-rise buildings, highways, airports, railways, tunnel structures, etc. depends to a large extent on whether the rock and soil can provide sufficient bearing capacity and control the settlement of the foundation. The parameters are mainly determined by the geotechnical test and the original test. Therefore, the geotechnical test and the original test are indispensable for the construction of various engineering projects. Loading test is a test that uses a rigid bearing plate to load step by step in the field to measure the deformation of natural foundation or composite foundation as the load changes, so as to determine the bearing capacity and deformation modulus of the foundation. According to the setting de...

Claims

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Application Information

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IPC IPC(8): E02D33/00
CPCE02D33/00E02D2600/10E02D2600/20Y02E30/30
Inventor 刘干斌姚燕明陈斌张春进叶俊能叶荣华
Owner NINGBO UNIV