CN102253178A

CN102253178A - Test method of soil body dynamic consolidation model

Info

Publication number: CN102253178A
Application number: CN2011101004595A
Authority: CN
Inventors: 李志清; 胡瑞林
Original assignee: Institute of Geology and Geophysics of CAS
Current assignee: Institute of Geology and Geophysics of CAS
Priority date: 2008-09-25
Filing date: 2008-09-25
Publication date: 2011-11-23
Anticipated expiration: 2028-09-25
Also published as: CN102253178B

Abstract

The invention discloses a test method of a soil body dynamic consolidation model. A test device is adopted in the test method. The test device comprises a tamping box, a tamping rack and a heavy hammer. The test method by utilizing the device comprises the following steps: (1) folding a side plate 1, a rear plate 2 and an organic glass plate 3 together; (2) laying premixed soil with a certain amount of water content and mass into the tamping box in layers; (3) tamping in a half model or in a complete model mode by beating the heavy hammer at one side or the middle part of the tamping rack; and (4) measuring change characteristics of the soil and water pressures as well as soil and water characteristic curves in the soil body tamping process. The test method provided by the invention has the following advantages: the tamping box, the tamping rack and the heavy hammer are designed according to the similarity coefficients required in the actual engineering; the change characteristics of the soil and water pressures as well as the soil and water characteristic curves in the site construction work can reappear by embedding a minitype soil pressure gage, a pore water pressure gauge, a water-containing probe and a suction probe in advance; and the indicators, such as consolidation coefficients and tamping degree of the tamping soil are measured.

Description

A kind of soil body dynamic consolidation model test method

Technical field

The present invention is a kind of geotechnological experimental technique, belongs to technical field of civil engineering.

Background technology

China uses hits the real soil processing highway subgrade history of existing decades.As everyone knows, this method can improve subgrade rating and modulus in compression, and this method has advantages such as easy construction, remarkable in economical benefits, obtains application more and more widely.Yet this method does not also have a cover mature theory and a design system, more is to rely on empirical design.The field construction complicated condition is developed an indoor soil tamp device to reproduce the site operation situation, and is most important for physical mechanics mechanism and pore water pressure variation characteristic behind the research soil tamp.At present, domestic only be the compaction test apparatus of research soil body maximum dry density, the test unit and the test method thereof that also do not have a research soil body scene to hit true property.

Summary of the invention

The object of the present invention is to provide a kind of soil tamp consolidation test method, modulus in compression behind the solution soil tamp and mechanics index of physics test.

Technical solution of the present invention, it is characterized in that this method adopts a kind of soil body dynamic consolidation device, this device comprises and hits real case, hit real frame and weight, hit real case and surround a cube by three iron plates and a poly (methyl methacrylate) plate, base plate is an iron plate that has drainage groove, it is skewed that groove is, one of them angle point has weep hole, is used for the groove draining, the base plate of casing and be provided with O-ring seal all around, three iron plates and base plate link together with hinge, the riveted joint of poly (methyl methacrylate) plate and base plate is sealed, and the film of band coordinate grid is posted on the poly (methyl methacrylate) plate surface, is used to read hit real settling data; Hit real frame and be placed on and hit above the real case, and fixedly hit real case position with fixed pin, hit on the real frame pulley is installed, be used to suspend in midair weight, the next door is equipped with ruler, is used to measure the weight height; Weight is the rectangular parallelepiped derby, is used for the hammering soil body.

Test method is: (1) is packed the soil body layering of certain water cut, quality into and is hit real case, miniature earth pressure gauge, pore pressure gauge, water cut probe, suction probe are put into soil layer by testing requirement, suitably densification, can sense data from poly (methyl methacrylate) plate film scale, calculate compactness; (2) will hit real case and advance and hit real frame below, and hit on the real frame weight by one group of suspended and the soil body is carried out half module hit real or carry out full mould and hit reality by hitting weight that real frame intermediate pulley hangs; (3) the weight suspension height is read by ruler, and weight falls behind the hammering soil body down, produces the displacement sedimentation and is read by the film that has coordinate grid; (4) hit in the real process, soil body soil pressure, water pressure, water cut and suction change by probe to be read by readout instrument, hits the physical mechanics mechanism and the pore water pressure variation characteristic of real soil with research; (5) moisture of the soil body in hitting real consolidation process is discharged by the weep hole at angle point place by the base plate drainage groove; (6) according to hitting the long-pending scale of real casing, soil body quality, indexs such as water cut can be calculated mechanics index of physics such as compressibility coefficient behind the soil tamp and compactness.

Advantage of the present invention: real case is hit in the similarity coefficient design according to actual engine request, hit real frame and weight, by pre-buried miniature earth pressure gauge, pore pressure gauge, water cut probe and suction probe, can reproduce native water pressure and native water characteristic curve variation characteristic in the site operation engineering, indexs such as the real native coefficient of consolidation and compactness are hit in measurement, physical mechanics mechanism and pore water pressure variation characteristic behind the research soil tamp, and this method is simple, easily row is workable.

The present invention is suitable for fields such as highway embankment, underground works.

Description of drawings

Fig. 1 is the stereographic map of the consolidation device of this method use.Among the figure: 1 side plate, 2 back plates, 3 connect hinge, 4 base plates, 5 castors, 6 preceding poly (methyl methacrylate) plates, 7 blocks.

Fig. 2 is the front view of consolidation device base plate 4.Among the figure: 8 rhones, 9 caulking grooves, 10 weep holes.

Fig. 3 is the A-A cut-open view of base plate front view.Among the figure: 8 rhones, vergence direction are from top to bottom.

Fig. 4 is a base plate front view B-B cut-open view.Among the figure: 8 rhones, vergence direction is from right and left.

Fig. 5 hits real frame front view.Among the figure: 11 pulleys.

Fig. 6 hits real frame C-C cut-open view.Among the figure: 11 pulleys can be positioned at a side or centre, 12 fixed pins.

Embodiment

Embodiment: (1) with side plate 1, back plate 2, and poly (methyl methacrylate) plate 3 closes up together, and embedding sealing mutually becomes casing, and whole box body embeds in the base plate caulking groove 9, and with hinge 3 connections; (2) permeable stone is placed on the base plate, the native place Min layers for preparing certain water cut and quality is in advance gone into to hit real case, bury miniature earth pressure gauge underground at diverse location, pore pressure gauge, the water cut probe, suction probe, and apply certain pressure and meet the requirements of initial compactness, compactness is controlled by poly (methyl methacrylate) plate film scale reading; (3) will hit real frame is placed on and hits above the real case, fixedly hit real case by fixed pin 12, the cube weight hangs by pulley 11, highly can be by hitting ruler control fixing on the real frame, fall by hitting real frame one side or centre that weight carries out half module or full mould hits reality, excessive moisture can drain into weep hole 10 by base plate 4 inclination rhones 8; (4) by watching poly (methyl methacrylate) plate gluing sheet scale, the control soil body sedimentation degree of depth, with the compactness behind the control soil tamp, and read pre-buried earth pressure gauge, WG, the measurement data of water cut probe and suction probe measures native water pressure and native water characteristic curve variation characteristic in the soil tamp process, hits the physical mechanics mechanism and the pore water pressure variation characteristic of real soil with research.

Claims

1. soil body dynamic consolidation model test method, it is characterized in that this method adopts a kind of test unit, this device comprises and hits real case, hit real frame and weight, hit real case by two blocks of side plates (1), a plate after one (2) and a poly (methyl methacrylate) plate (6) surround a cube case, base plate (4) is an iron plate that has rhone (8), it is skewed that groove is, one of them angle point has weep hole (10), the cube case by caulking groove (9) build-in on base plate, base plate and be provided with O-ring seal all around, side plate (1), back plate (2) links together with hinge (3) with base plate (4), and poly (methyl methacrylate) plate (6) is sealed with base plate (4) riveted joint, and the film of band coordinate grid is posted on poly (methyl methacrylate) plate (6) surface, hitting real frame is placed on and hits above the real case, and fixedly hit real case position with fixed pin (12), and to hit pulley (11) is installed on the real frame, the next door is equipped with ruler, weight is the rectangular parallelepiped derby, and it is as follows to carry out soil body dynamic consolidation model test method with this device:

1. with side plate (1), back plate (2), poly (methyl methacrylate) plate (3) closes up together, and embedding sealing mutually becomes casing, and whole box body embeds in the base plate caulking groove (9), and connects with hinge (3);

2. permeable stone is placed on the base plate, the native place Min layers for preparing certain water cut and quality is in advance gone into to hit real case, bury miniature earth pressure gauge underground at diverse location, pore pressure gauge, the water cut probe, suction probe, and apply certain pressure and meet the requirements of initial compactness, compactness is controlled by poly (methyl methacrylate) plate (3) film scale reading;

3. will hit real frame is placed on and hits above the real case, fixedly hit real case by fixed pin (12), the cube weight hangs by pulley (11), highly can be by hitting ruler control fixing on the real frame, fall by hitting real frame one side or centre that weight carries out half module or full mould hits reality, excessive moisture can drain into weep hole (10) by base plate (4) inclination rhone (8);

4. by watching poly (methyl methacrylate) plate gluing sheet scale, the control soil body sedimentation degree of depth, with the compactness behind the control soil tamp, and read pre-buried earth pressure gauge, WG, the measurement data of water cut probe and suction probe measures native water pressure and native water characteristic curve variation characteristic in the soil tamp process, hits the physical mechanics mechanism and the pore water pressure variation characteristic of real soil with research.