Method for testing deformation modulus of foundation soil by flexible bearing plate load test
A technology of deformation modulus and load test, applied in the direction of mechanical solid deformation measurement, electric/magnetic solid deformation measurement, measuring device, etc., can solve the problem of complex stress distribution at the bottom of the plate, and achieve the effect of ensuring accuracy
Inactive Publication Date: 2018-03-13
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Deformation modulus of foundation soil E 0 Through the plate load test, at present, the bearing plates used in the plate load test are all rigid bearing plates. The rigid bearing plate has a large bending stiffness relative to the foundation soil, and the bottom of the plate is always kept flat under the vertical load. The actual stress distribution is complex, and when calculating E 0 When it is assumed that the stress at the bottom of the slab is evenly distributed, and a uniform settlement coefficient is introduced, the calculated E 0 There is a certain deviation
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[0022] A method for testing the deformation modulus of foundation soil by a flexible bearing plate load test,
[0023] see figure 1 , the loading plate includes a plate body (steel plate) and a support arranged on the upper end of the plate body for transmitting vertical pressure. Before the test, a rectangular parallelepiped airbag with pump holes is installed on the lower part of the rectangular plate body to form a flexible bearing board, the height of the space inside the airbag is 3-5cm. The material of the airbag body is carbon fiber cloth, and the inside of the airbag is coated with flexible waterproof paint. The shape of the upper surface and the lower surface of the airbag is the same as that of the plate body and is installed correspondingly. A first displacement measuring device for measuring the settlement value of the bearing plate is provided at the upper end of the plate body. Preferably, the first displacement measuring device A dial gauge is adopted, the mea...
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The invention discloses a method for testing the deformation modulus of the foundation soil by a flexible bearing plate load test with relatively high test precision. The method includes the steps ofpreparing a bearing plate, installing a cuboid-shaped air bag with a pump air hole on the lower portion of a bearing plate before testing, forming a flexible bearing plate, where a first displacementmeasuring device used for measuring the settlement value of the bearing plate is arranged, installing a second displacement measuring device used for measuring the thickness change value of the air bag in the air bag, applying a vertical pressure p to the bearing plate during testing, generating air pressure p by pumping air in the air bag through the pump air holes, so that the vertical pressureP and the air pressure p in the air bag meet P= A * p, enabling the bottom surface of the air bag to be attached to the surface of the foundation soil, wherein A represents the area of the bag bottom,taking the total value of the settlement value s1 measured by the first displacement measuring device plus the thickness change value s2 of the air bag measured by the second displacement measuring device as a settlement value s at the center of the bottom of the flexible bearing plate, and calculating the deformation modulus e0 of the foundation soil in combination with other parameters.
Description
technical field [0001] The invention relates to a method for testing the deformation modulus of foundation soil, specifically a new method for testing the deformation modulus of foundation soil by using a flexible bearing plate instead of a rigid bearing plate to conduct a load test. Background technique [0002] Deformation modulus of foundation soil E 0 It determines the settlement and deformation of the foundation. The superstructure of the building, the foundation and the foundation will interact, and the settlement and deformation of the foundation will also affect the force of the foundation and the superstructure. Therefore, E 0 Both the design of the foundation and the superstructure are very important. Deformation modulus of foundation soil E 0 Through the plate load test, at present, the bearing plates used in the plate load test are all rigid bearing plates. The rigid bearing plate has a large bending stiffness relative to the foundation soil, and the bottom of ...
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Login to View More IPC IPC(8): G01B5/02G01B5/30G01B7/06G01B7/16G01C5/00
CPCG01B5/02G01B5/30G01B7/06G01B7/16G01C5/00
Inventor许年春黄伟吴同情赵宝云况龙川吴越李东升
OwnerCHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY