Indoor foundation soil preparation device capable of keeping on-site stress state and preparation method thereof

A technology of stress state and preparation device, which is applied in the field of geotechnical engineering and can solve the problems of unrepresentative and inability to achieve the consistency of stress state and site.

Pending Publication Date: 2021-08-27

CHINA THREE GORGES CORPORATION

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AI-Extracted Technical Summary

Problems solved by technology

[0004] In the existing technology, after the soft clay foundation with the required strength is generally prepared, the preload is removed to carry out subsequent indoor model tests. Therefore, the preparation of the soft clay foundation in the existing technology can only ens...

Method used

As shown in Figure 1 ~ 3, a kind of indoor foundation soil preparation device that can keep on-site stress state comprises support 1, and in the present embodiment, support 1 comprises vertical support leg 101 and oblique support leg 102, vertical The straight support leg 101 and the oblique support leg 102 are connected by a horizontal support rod 103 . The included angle between the inclined support legs 102 and the vertical direction is 20°, which reduces the occupied space as much as possible while enhancing the structural stability. A crossbeam 2 is provided on the support 1 , specifically, the crossbeam 2 is arranged between two numerical support legs 101 .

Consolidation pressing plate 5 upper side is connected with force transmission plate 8 by load transmission frame 7, and load transmission frame 7 comprises the short vertical bar that is connected wi...

Abstract

The invention provides an indoor foundation soil preparation device capable of keeping a field stress state and a preparation method thereof. The indoor foundation soil preparation device comprises a support, a cross beam is arranged on the support, a consolidation model box is arranged at the upper end of the support, a drainage valve is arranged on the consolidation model box, a consolidation pressing plate is arranged in the consolidation model box, and a plurality of test holes are formed in the consolidation pressing plate; the test holes are closed through a closing cover plate, the upper side of the consolidation pressing plate is connected with a force transmission plate through a load transmission frame, a loading mechanism is arranged below the consolidation model box and comprises a loading rod, one end of the loading rod is hinged to the cross beam, the other end of the loading rod is provided with a connecting rod, the lower end of the connecting rod is provided with a weight disc, and the force transmission plate is arranged below the loading rod. And a force transmission mechanism is arranged between the force transmission plate and the loading rod. According to the device and the preparation method, when the soft clay foundation with the required strength is prepared, the stress state consistent with the on-site foundation soil is maintained, and the soft clay foundation closer to the on-site real physical and mechanical state is prepared for carrying out an indoor model test.

Application Domain

Preparing sample for investigationFoundation testing

Technology Topic

Soft claySoil science +2

Image

Examples

Experimental program(1)

Example Embodiment

[0027] like Figure 1 ~ 3 As shown, a chamber-based earth foundation device that can maintain a live stress state, including a bracket 1, in the present embodiment, the bracket 1 includes a vertical support leg 101 and an oblique support leg 102, a vertical support leg 101 and an oblique support leg 102 is connected to the horizontal support rod 103. The oblique support leg 102 is 20 ° in the vertical direction of the vertical direction, while reinforcing the structural stability, minimally decreased as much as possible. The bracket 1 is provided with a beam 2, specifically, and the beam 2 is disposed between two numerical support legs 101.

[0028] The stent 1 is provided with a consolidated model box 3, and the consolidated model box 3 is as 3: 1, and the longer length satisfies a multi-stage test. A drain valve 4 is provided on the fixed mold box 3, and a fixed plate 5 is provided in the composite mold case 3, and the fixed pressure plate 5 can be provided with a plurality of groups to improve the ability to uniformity. A plurality of test holes 501 are provided on the fixed platen 5, and the test holes 501 can be provided with different sizes and shapes as needed, and the test holes 501 are closed by the closed cover 6.

[0029] Preferably, if Figure 4 As shown, the closed cover plate 6 is provided with a filling projection 601, and the filling projection 601 is filled in the test hole 501, and the lower side of the filling projection 601 is parallel to the lower side of the fixed plate 5, and the closed cover 6 is passed through the bolt 15. Connect with the fixed pressure plate 5.

[0030] By the mating of the projection 601 and the test hole 501, the ground foundation in the test hole 501 is prevented from being filled. The test holes 501 can be guaranteed to be completely closed.

[0031] The upper side of the fixed platen 5 is connected to the force plate 8 on the upper side, and the load transfer frame 7 includes a short vertical rod connected to the fixed plate 5 and a long vertical rod connected to the force plate 8, short vertical direction. The rod and long vertical rod are connected by a connecting rod, and the load transfer frame 7 across the consolidation of the mold case 3, so that the load mechanism of the consolidated plate 5 is placed below the consolidation model box 3, which is convenient for the test equipment to be installed. The model box 3 is on the upper side.

[0032] A load mechanism is provided below the consolidation model box 3, and the load mechanism includes a carrier 9, and the end of the carrier 9 is hinged with the beam 2, specifically, such as image 3 Design, a hinge portion 13 is provided on the beam 2, and the carrier 9 is hinged from the hinge 13, and the other end of the carrier 9 is provided with a connecting rod 10, and the lower end of the connecting rod 10 is provided with a weight disk 11, connected. The lower end of the rod 10 is provided with an external thread, and the center of the weight disc is provided with a threaded hole in which the connecting rod 10 is fitted, and the force plate 8 is disposed below the carrier rod 9, and there is a force between the force plate 8 and the carrier 9. Institution 12.

[0033] By placing the weight on the weight disc 11, the load rod 9 is applied, the carrier 9 is rotated along the hinge position of the beam 2, and the carrier rod 9 is in contact with the force mechanism 12, and the power supply plate 8 is pressed down by the force mechanism 8 Further, the fixed pressure plate 5 is pulled downward by the load transfer frame 7, and the lower pressure of the mud in the fixed mold box 3 is realized.

[0034] The force mechanism 12 and the carrier 9 form a lever structure, which can effectively enlarge the load and transfer the load to the force plate 8.

[0035] The device is located below the consolidation model box 3, and there is sufficient space to install the test equipment above the consolidation model box 3. The test hole 501 is provided on the fixed platen 5 to carry out subsequent model tests. The indoor model test can be carried out without unloading the preloaded load, thereby achieving the in-room test soft and bonded land based strength, stress state is consistent with the ground soil, reaching the preparation and maintaining the on-site stress state.

[0036] Preferably, the force mechanism 12 is jack. The jack can ensure that the carrier 9 can be held substantially horizontally by height adjustment.

[0037] The jack is adjusted to adjust the position of the lever structure fulfillment to achieve preload load adjustment.

[0038] Preferably, the end portion of the carrier 9 is provided with a mounting groove 901, and the connecting rod 10 is mounted in the mounting groove 901 by the rotation shaft 14. Thereby, the connecting rod 10 can be rotated in a vertical plane to ensure that the connecting rod 10 is always in a vertical state.

[0039] Preferably, the upper end of the consolidation model box 3 is provided with a support flap 14. By setting the support wing plate 14, it is convenient for the installation of the test equipment.

[0040] A method of preparing a room-based earth foundation device that maintains the live stress state, including the following steps:

[0041] Step 1, the nonwoven fabric is paved at the bottom of the consolidation model box 3, and the stirred soft clay mud is placed in the consolidation model box 3, and the non-woven fabric is laid on the top of the mud surface;

[0042] Step 2, connect the fixed pressure plate 5 to the load transfer frame 7, and the load transfer frame 7 is connected to the force plate 8 using the crane to the consolidator box 3.

[0043] Step 3, open the drain valve 4, determine the size of the step-by-step load weight according to the design preloaded load, and add water to the consolidated model box 3 during loading, and ensure that the mud surface is below the surface;

[0044]Step 4, after the softness of the base is solid to the desired intensity, the test device is mounted on the consolidation model box 3, according to the test position, open the corresponding test hole 501, and determine the prepared soft and bonded soil strength or the required basis.Test with soil interaction model.

[0045] By performing an indoor model test without unloading a preloaded load, the desired strength soft and bonded land base is maintained while maintaining the stress of the field grounds, and the production of the indoor model test is closer to the real physical mechanics state.Clay foundation.

PUM

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