CN215949472U

CN215949472U - Device for actually measuring grouting consolidation stratum pressure and parameter optimization

Info

Publication number: CN215949472U
Application number: CN202122383797.6U
Authority: CN
Inventors: 杨家松; 邓宝华; 康杰; 李松; 杨龙伟; 陈敏; 陈耀; 侯建文; 黄红; 谢晓飞; 和培源
Original assignee: China Railway Erju 2nd Engineering Co Ltd
Current assignee: China Railway Erju 2nd Engineering Co Ltd
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2022-03-04
Anticipated expiration: 2031-09-29

Abstract

The utility model relates to the technical field of geotechnical engineering, and provides a device for actually measuring grouting consolidation stratum pressure and parameter optimization, which is matched with a core sample arranged in a grouting area of a grouting hole for use and comprises at least one detection unit and a pressure recorder; the detection unit is arranged at the geometric center of the connecting line of adjacent grouting holes which form any polygonal unit, and comprises a detection hole and a pressure detection device arranged in the detection hole, and the pressure detection device is in communication connection with a pressure recorder; the utility model solves the problem that the actual pressure condition in the stratum is mastered in the grouting process, has simple operation and better improves the grouting quality.

Description

Device for actually measuring grouting consolidation stratum pressure and parameter optimization

Technical Field

The utility model relates to the technical field of geotechnical engineering, in particular to a device for actually measuring grouting consolidation stratum pressure and parameter optimization.

Background

The construction method is characterized in that surrounding rocks in front of a tunnel (cave) and an underground engineering excavation surface (tunnel face) are broken and weak, the bearing capacity of a base of a structure (comprising the tunnel (cave) and the underground engineering, a bridge, a roadbed, a house building and the like) is weak, or a thick weak layer or a karst filler is underlying, and the like, the weak or broken engineering geological environment mainly comprising soil or the filler is subjected to grouting reinforcement on the stratum by adopting a grouting method so as to improve the bearing capacity, control the deformation and maintain or improve the raft stability of the stratum, and meanwhile, the construction method is favorable for accelerating the engineering progress and saving the investment compared with pile (pile) foundation construction. If a water-containing stratum is met, the slurry is easy to diffuse once the grouting pressure is greater than the hydrostatic pressure due to the existence of water; for the non-water-containing stratum (or the stratum with low water content), the slurry diffusion is greatly influenced by the spacing of grouting holes, the grouting pressure and the physical parameters of the stratum.

The method is characterized in that advanced grouting (horizontal direction) of tunnels (holes) and underground engineering or long object foundation reinforcement grouting (vertical direction is the main point) is constructed, grouting parameters are selected in advance according to experience, and then the parameters are determined by testing on site. In the stage of testing and verifying parameters, whether grout or grout vein effectively fills the stratum between grouting holes and is solidified compactly is judged, static (dynamic) touch detection (bearing capacity change) is added later according to core samples taken before and after grouting (the change of physical parameters of the core samples before and after solidification and water pressure tests (the change of water permeability of the stratum before and after solidification), and with the development of geophysical prospecting technology, methods such as elastic wave or cross-hole CT (wave velocity change) are supplemented. This evaluation method also has its drawbacks, and 1) the number of comparison detection holes is 5% of the total number of holes, which is not very representative and has its limitations. The quality of verified holes is often found to meet the requirements, but the grouting effect is extremely poor, for example, when a tunnel is excavated after ground consolidation grouting is adopted, when excavation of a tunnel face reveals, the phenomenon that gaps (or soil holes) among holes have no grout (veins) in an overlapped area or water (mud) seeps locally is obviously found; 2) in the test process, the diffusion range and the consolidation quality condition of the slurry cannot be found in time, and parameters such as overlarge hole spacing or undersize pressure, and dense stratum parts can be corrected in time, so that the phenomena that the diffusion radius edges cannot be effectively overlapped, the grouting condition is met, the grouting is finished in advance and the like can be caused. 3) The reading of the grouting pressure gauge swings greatly, the experience of mastering the actual grouting pressure value is strong, and the actual grouting pressure value of the stratum cannot be accurately judged, so that the effective diffusion of slurry is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a device for actually measuring grouting consolidation stratum pressure and optimizing parameters, which can solve the problem that the actual pressure condition in the stratum is mastered in the grouting process, is simple to operate and better improves the grouting quality.

The embodiment of the utility model is realized by the following technical scheme: a device for actually measuring grouting consolidation stratum pressure and parameter optimization is matched with a core sample arranged in a grouting area of a grouting hole for use and comprises at least one detection unit and a pressure recorder; the detection unit is arranged at the geometric center of the connecting line of adjacent grouting holes which form the polygonal unit at will, and comprises a detection hole and a pressure detection device arranged in the detection hole, and the pressure detection device is in communication connection with the pressure recorder.

Further, the core sample is arranged at the connecting line of the detection hole and the grouting hole.

Furthermore, the distance between the core sample and the detection hole is H, wherein H is more than 15cm and less than 20 cm.

Further, the slip casting hole includes from inside to outside in proper order: the sleeve valve pipe is provided with a plurality of overflow holes.

Further, the pressure detection device comprises a first pressure detection device and a second pressure detection device; the detection hole is internally provided with the following components in sequence from bottom to top: the sand-filling device comprises a middle fine sand layer and a backfill layer, a first pressure detection device and a second pressure detection device are arranged in the middle fine sand layer, and the first pressure detection device and the second pressure detection device are provided with height differences.

Further, the height difference between the first pressure detection device and the second pressure detection device is larger than or equal to the length of the grouting segment.

Furthermore, the first pressure detection device and the second pressure detection device are arranged close to the hole wall of the detection hole.

The technical scheme of the embodiment of the utility model at least has the following advantages and beneficial effects: the method can solve the problem that the actual pressure condition in the stratum is mastered in the grouting process, and the grouting parameters (pressure and hole distance) are adjusted in time by combining different geological conditions, so that the consolidation quality can be effectively guaranteed, the links of grouting supplement are reduced, and the effect is improved; and simultaneously avoids the pulp waste caused by excessive consolidation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic top view of an apparatus for actually measuring grouting consolidation formation pressure and parameter optimization according to the present invention;

FIG. 2 is a schematic cross-sectional structure diagram of an apparatus for actually measuring grouting consolidation formation pressure and parameter optimization according to the present invention;

FIG. 3 is a cross-sectional view taken along line 1-1 of FIG. 2;

FIG. 4 is a schematic structural diagram of a detection hole in the device for actually measuring grouting consolidation formation pressure and parameter optimization according to the present invention;

fig. 5 is a schematic structural diagram of a first pressure detection device in the device for actually measuring grouting consolidation formation pressure and parameter optimization according to the present invention;

icon: 1-grouting hole, 2-detection hole, 3-core sample, 21-first pressure detection device, 22-second pressure detection device, 11-grouting pipe, 12-pressure grout, 13-sleeve valve pipe, 14-soft rubber, 15-casing material, 16-overflow hole, 23-cable, 24-nylon rope, 25-medium fine sand layer and 26-backfill layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the products of the present invention are used, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the device or element which is referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

As shown in fig. 1, a device for actually measuring grouting consolidation formation pressure and parameter optimization is used in cooperation with a core sample 3 arranged in a grouting area of a grouting hole 1, and specifically comprises at least one detection unit and a pressure recorder; the pressure recorder is used for drawing a P-T curve, P pressure and T time according to a pressure numerical value detected by the detection unit, matching parameters (an acquisition rate, a volume (specific) weight value, a pulp pulse filling description and the like) of the core sample 3 on the basis of the P-T curve and combining other detection (a water pressing test, a penetration test, sound waves and the like) and observation results, and analyzing the rationality of the pressure and the hole distance and optimizing grouting parameters by the system.

Specifically, in order to ensure that the data detected by the detection unit is highly feasible, for this purpose, the detection unit is arranged at the geometric center of the connecting line of adjacent grouting holes 1 which arbitrarily form a polygonal unit, which is to be noted herein, the polygonal unit comprises a quadrangle, a triangle or a pentagon, and this is a polygon formed by the smallest units; the detection unit is arranged at the geometric center of the detection unit, so that the distance from the detection unit to each tip is consistent, and the accuracy of the detected data is guaranteed.

As shown in fig. 2 and 4, the detection unit comprises a detection hole 2 and a pressure detection device arranged inside the detection hole 2, and the pressure detection device is in communication connection with a pressure recorder; the connection mode is not limited at all, and a data line mode or a wireless communication mode can be adopted, in this embodiment, a mode that the cable 23 is matched with a nylon line is adopted; any one of the solutions is a technical scheme which can be seen on the market; specifically, the pressure detection means includes a first pressure detection means 21 and a second pressure detection means 22; it should be noted that the pressure detection device may be a soil pressure (meter) box commonly used in the industry, as shown in fig. 5.

As shown in fig. 4, the inside of the detection hole 2 is, from bottom to top: the first pressure detection device 21 and the second pressure detection device 22 are arranged in the middle fine sand layer 25, so that the first pressure detection device 21 and the second pressure detection device 22 can be ensured not to be influenced by other factors, and the accuracy of detection data is ensured, furthermore, the first pressure detection device 21 and the second pressure detection device 22 are arranged close to the hole wall of the detection hole 2, and in order to better detect the pressure transmitted from the grouting hole 1, the first pressure detection device 21 and the second pressure detection device 22 are provided with height difference; preferably, the height difference between the first pressure detecting device 21 and the second pressure detecting device 22 is greater than or equal to the grouting segment length.

In this embodiment, it should be further noted that, in order to ensure the accuracy of data detection, the core sample 3 is disposed at the connecting line of the detection hole 2 and the grouting hole 1, specifically, the distance between the core sample 3 and the detection hole 2 is H, and H is greater than 15cm and less than 20 cm. The accuracy of sampling the grouting is ensured; of course, in the present embodiment, as shown in fig. 3, the grouting holes 1 include, in order from the inside to the outside: the grouting device comprises a grouting pipe 11, pressure grout 12, a sleeve valve pipe 13, a soft rubber 14 and sleeve shell materials 15, wherein a plurality of overflow holes 16 are formed in the sleeve valve pipe 13, and the overflow holes 16 are used for leaking out the high-pressure grouting.

The specific using process is as follows: positioning the detection hole 2, hollowing, arranging a pressure detection device, grouting, drawing a P-T curve, taking a core sample 3, and analyzing parameters.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a device that actual measurement slip casting consolidation stratum pressure and parameter are optimized, cooperation setting core appearance (3) in the slip casting region of injected hole (1) use, its characterized in that: comprises at least one detection unit and a pressure recorder;

the detection unit is arranged at the geometric center of the connecting line of the adjacent grouting holes (1) which form the polygonal unit at will, and comprises a detection hole (2) and a pressure detection device arranged inside the detection hole (2), and the pressure detection device is in communication connection with a pressure recorder.

2. The apparatus for actual measurement grouting consolidation formation pressure and parameter optimization according to claim 1, wherein: the core sample (3) is arranged at the connecting line of the detection hole (2) and the grouting hole (1).

3. The apparatus for actual measurement grouting consolidation formation pressure and parameter optimization according to claim 2, wherein: the distance between the core sample (3) and the detection hole (2) is H, and H is more than 15cm and less than 20 cm.

4. The apparatus for actual measurement grouting consolidation formation pressure and parameter optimization according to claim 1, wherein: the grouting holes (1) sequentially comprise from inside to outside: the sleeve valve comprises a grouting pipe (11), pressure grout (12), a sleeve valve pipe (13), soft rubber (14) and a sleeve shell material (15), wherein a plurality of overflow holes (16) are formed in the sleeve valve pipe (13).

5. The apparatus for actual measurement grouting consolidation formation pressure and parameter optimization according to claim 1, characterized in that: the pressure detection means comprises a first pressure detection means (21) and a second pressure detection means (22);

the detection hole (2) is internally provided with the following components in sequence from bottom to top: the sand-filling device comprises a middle fine sand layer (25) and a backfill layer (26), wherein a first pressure detection device (21) and a second pressure detection device (22) are arranged in the middle fine sand layer (25), and the first pressure detection device (21) and the second pressure detection device (22) are provided with height differences.

6. The apparatus for actual measurement grouting consolidation formation pressure and parameter optimization according to claim 5, wherein: the height difference between the first pressure detection device (21) and the second pressure detection device (22) is larger than or equal to the length of a grouting segment.

7. The apparatus for actual measurement grouting consolidation formation pressure and parameter optimization according to claim 6, wherein: the first pressure detection device (21) and the second pressure detection device (22) are arranged close to the hole wall of the detection hole (2).