CN111399373B - GIN grouting flow pressure intelligent control method - Google Patents
GIN grouting flow pressure intelligent control method Download PDFInfo
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- CN111399373B CN111399373B CN202010256564.7A CN202010256564A CN111399373B CN 111399373 B CN111399373 B CN 111399373B CN 202010256564 A CN202010256564 A CN 202010256564A CN 111399373 B CN111399373 B CN 111399373B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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Abstract
A GIN grouting flow pressure intelligent control method comprises the following control modes, a flow pressure product constant delta is defined to be P x Q, and the flow pressure product constant delta is a value determined by a GIN value; p-grouting pressure, Q is fluid volume flow, the grouting stage is divided into five stages A, B, C, D, E according to different grouting pressures, and the control modes of the stages are different. By adopting the intelligent GIN grouting flow pressure control method, grouting pressure is regulated in different areas in a semi-quantitative mode. The grouting pressure control method provides theoretical basis and practical operation means for pressure control in the grouting process, improves controllability of the grouting process, and enables practically completed grouting pressure control to be more easily expected.
Description
Technical Field
The invention belongs to the technical field of buildings, relates to a grouting technology, and particularly relates to a GIN grouting flow pressure intelligent control method.
Background
Grouting is the process of pouring some solidified materials, such as cement, lime or other chemical materials, into the ground rock and soil within a certain range under the foundation to fill cracks and pores in the rock and soil, prevent the leakage of the foundation and improve the integrity, strength and rigidity of the rock and soil. In floodgates, dams, dikes and other water retaining buildings, a foundation impervious curtain is constructed by a grouting method, which is a main foundation treatment measure of hydraulic buildings; the slurry with fluidity and gelatination property is pressed into the stratum or the gap of the building according to a certain proportion requirement by drilling (or pre-buried pipes) to be cemented and hardened into a whole, thereby achieving the engineering purposes of seepage prevention, consolidation and reinforcement.
The GIN (Grouting Intensity Number) Grouting method can also be called Grouting strength value Grouting method, and the GIN is kept to be a constant value in the whole Grouting process of a Grouting section.
Relatively much energy must be expended to grout the rock mass tightly. Within a grouting section, the energy consumption is approximately equal to the product of the grouting pressure P and the cumulative injection V per section length, i.e. P × V. This value P × V is called the GIN value (grouting strength value). When the grouting pressure is measured in MPa and the cumulative injection amount per unit length is measured in L/m, the GIN value can be expressed in MPa × L/m. For example, a GIN value of 200 is P × V =200 (MPa × L/m). In the prior art, a clear guiding method for adjusting the grouting process is lacked.
Disclosure of Invention
In order to overcome the technical defects in the prior art, the invention discloses a GIN grouting flow pressure intelligent control method.
The intelligent GIN grouting flow pressure control method comprises the following control modes,
defining a flow-pressure product constant δ = P × Q, the flow-pressure product constant δ being a value determined by the GIN value;
wherein P-grouting pressure, Q is fluid volume flow,
according to different grouting pressures, the grouting stage is divided into five stages A, B, C, D, E, and the control mode of each stage is as follows:
section A, the pressure range is that P is more than or equal to 0 and less than or equal to P1,
adopting rapid pressure boosting operation, boosting speed V1, and flow-limiting grouting;
and B, section: the pressure range is P1-P2;
adopting continuous slow boosting operation, the boosting speed is V2, and V2 is less than V1, and the flow-limiting grouting is adopted
And C, section: the pressure range is P2-P3
Keeping the pressure stable around P3 and keeping the pressure unchanged;
and D, section: p is not less than P3MAX
Keeping the pressure and the flow stable and unchanged;
e, section: p = PMAX
Keeping the pressure and the flow stable and unchanged;
PMAXand QMAXThe pressure maximum and the flow maximum under the constraint of critical conditions are respectively, and the relation of each stage P, Q is as followsEquation δ = P × Q constraint;
the endpoint values for the various phases are defined as:
first flow value Q1=δ/PMAX；
Second flow value
Third flow value Q3=（1-ΔB）QMAX
Fourth flow rate value Q4= QMAX；
First pressure value P1=δ/QMAX；
Second pressure value
Third pressure value P3=（1-ΔA）PMAX
A fourth pressure value P4= PMAX；
The first and second reduction amounts Δ a and Δ B are constant values set in advance.
Preferably, the first reduction Δ a =0.1 and the second reduction Δ B = 0.5.
By adopting the intelligent GIN grouting flow pressure control method, grouting pressure is regulated in different areas in a semi-quantitative mode. The method provides theoretical basis and practical operation means for pressure control in the delta grouting process, improves the controllability of the grouting process and enables the practically finished grouting pressure control to be more easily in line with expectations.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the intelligent GIN grouting flow pressure control method.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The invention is mainly used for adjusting and controlling the pressure in the GIN grouting method in real time, so that the pressure in the grouting process is consistent with an expected value as much as possible and the construction requirement is met.
Pressure regulation plays a very important role in grouting systems. When the pressure in the hole exceeds the set pressure value, the opening degree of the regulating valve is regulated. The purpose of stabilizing the pressure is achieved. The regulating valve is a throttling element with variable local resistance, and the pressure loss of incompressible liquid is known according to the energy conservation principle as follows:
wherein the meaning of each parameter is:
pressure loss of delta P regulating valve
Average speed of omega-fluid
Rho-fluid density
p1，p2Pressure before and after the regulating valve
The average velocity of the fluid is:
ω=Q/F （2）
wherein: q-fluid volumetric flow, flow for short.
Flow cross-sectional area of F-regulating valve
The two formulas of the combined vertical type (1) and (2) can obtain the flow equation of the regulating valve
Wherein: a is a constant related to the dimension selected for each parameter.
According to the formula (3), a nonlinear relation exists between the fluid volume flow Q and the pressure.
Relatively much energy must be expended to grout the rock mass tightly. Within a grouting section, the energy consumption is approximately equal to the product of the grouting pressure P and the cumulative injection V per section length, i.e. P × V. This value P × V is called GIN value (grout strength value). When the grouting pressure is measured in MPa and the cumulative injection amount per unit length is measured in L/m, the GIN value can be expressed in MPa × L/m.
In the prior art, a clear guiding method for adjusting the grouting process is lacked. In the GIN grouting method, the GIN is maintained at a constant value throughout the grouting of one grouting section. In a grouting section, the energy consumption is approximately equal to the product of the grouting pressure P and the accumulated injection amount V per section length, i.e. P x V is a constant value, and in the case that the time is usually a fixed value, the grouting strength value can be directly converted into a relation between the grouting pressure P and the injection amount Q, and a constant is defined, and the constant value is only related to the GIN value and the grouting time under the engineering definition.
δ=P*Q （4）。
Wherein, the P-grouting pressure is MPa;
q-fluid volumetric flow, in L/Min units.
According to the technical specification of hydraulic construction cement grouting construction (DL/T5148-2017), the step-by-step pressure boosting or sequential pressure boosting can be adopted under the condition that the maximum pressure and the maximum flow are not exceeded by definite manual control.
Furthermore, there is a maximum allowable pressure value P, constrained by the critical conditions that ensure that the bedrock is not destroyedMAXMaximum sum flow QMAX，
The first reduction amount Δ a and the second reduction amount Δ B may be 0.1 and 0.15, respectively, when the flow rate and the pressure are 30L/min and 0.1mpa, respectively, for example, according to the values of the flow rate and the pressure.
Under the constraint of equation (4), four pressure points P1-P4 and corresponding flow points Q1-Q4 are set,
first flow value Q1=δ/PMAX；
Second flow value
Third flow value Q3=（1-ΔB）QMAX
Fourth flow rate value Q4= QMAX；
First pressure value P1=δ/QMAX；
Second pressure value
Third pressure value P3=（1-ΔA）PMAX
A fourth pressure value P4= PMAX(ii) a The grouting stage can be divided into 5 stages A, B, C, D, E according to the pressure, as shown in fig. 1, and different grouting flow rates Q are adopted for different pressure stages, and the curve in fig. 1 is the curve of equation (4).
Wherein the pressure value of the section A is more than or equal to 0 and less than or equal to P1
At this time, the pressure P is very small and tends to 0, and is generally less than or equal to 0.1 MPa.
Fast boost operation may be used at this time, for example, the boost speed V1 may be 0.1 mpa/sec; and (4) flow-limiting grouting, wherein the flow Q is less than or equal to 30L/min, and the flow is correspondingly adjusted according to the formula (4) and the pressure change.
In practice, if the pressure is still not changed significantly after 15 minutes or 300L of cumulative injection, the slurry changing operation can be performed.
And B, section: p1 is less than or equal to P2
At the moment, the pressure P is smaller and is generally less than or equal to 0.3 MPa;
with continuous slow boost operation, for example, the boost speed V2 may be 0.02 mpa/sec; and (4) flow-limiting grouting, wherein the flow Q can still set the maximum value, such as Q is less than or equal to 30L/min. The slurry changing operation is performed if there is no significant change in pressure, for 15 minutes or the cumulative injection amount reaches 300L.
And C, section: p is not less than P2 and not more than P3
At this time, the grouting stage is stabilized, the pressure is stable, and the flow is stable.
And adopting PQ control to stably grout the injection rate, gradually increasing the grouting pressure when the injection amount is increased, and controlling the grouting pressure to be stable near P3 when the pressure is increased to P3 so that the injection rate Q is continuously reduced to be less than or equal to 5L/min.
And D, section: p is not less than P3MAX
The pressure is close to the design pressure PMAXAnd stabilizing the pressure P, and adjusting to ensure that the volume flow Q of the fluid is less than or equal to 3L/min.
E, section: p = PMAX
The pressure reaches the design pressure PMAXAnd stabilizing the pressure P to ensure that the volume flow Q of the fluid is less than or equal to 1L/min, and finishing grouting after continuing for 30 minutes.
By adopting the intelligent GIN grouting flow pressure control method, grouting pressure is regulated in different areas in a semi-quantitative mode. The grouting pressure control method provides theoretical basis and practical operation means for pressure control in the grouting process, improves controllability of the grouting process, and enables practically completed grouting pressure control to be more easily expected.
The foregoing is directed to preferred embodiments of the present invention, wherein the preferred embodiments are not obviously contradictory or subject to any particular embodiment, and any combination of the preferred embodiments may be combined in any overlapping manner, and the specific parameters in the embodiments and examples are only for the purpose of clearly illustrating the inventor's invention verification process and are not intended to limit the scope of the invention, which is defined by the claims and the equivalent structural changes made by the description and drawings of the present invention are also intended to be included in the scope of the present invention.
Claims (2)
1. A GIN grouting flow pressure intelligent control method is characterized by comprising the following control modes,
defining a flow-pressure product constant δ = P × Q, the flow-pressure product constant δ being a value determined by the GIN value;
wherein P-grouting pressure, Q is fluid volume flow,
according to different grouting pressures, the grouting stage is divided into five stages A, B, C, D, E, and the control mode of each stage is as follows:
section A, the pressure range is that P is more than or equal to 0 and less than or equal to P1,
adopting rapid pressure boosting operation, boosting speed V1, and flow-limiting grouting;
and B, section: the pressure range is P1-P2;
adopting continuous slow boosting operation, the boosting speed is V2, and V2 is less than V1, and the flow-limiting grouting is adopted
And C, section: the pressure range is P2-P3
Keeping the pressure stable around P3 and keeping the pressure unchanged;
and D, section: p is not less than P3MAX
Keeping the pressure and the flow stable and unchanged;
e, section: p = PMAX
Keeping the pressure and the flow stable and unchanged;
PMAXand QMAXThe pressure maximum and the flow maximum under the constraint of critical conditions are respectively, and the relation of each stage P, Q is constrained by the equation delta = P × Q;
the endpoint values for the various phases are defined as:
first flow value Q1=δ/PMAX；
Second flow value
Third flow value Q3=（1-ΔB）QMAX
Fourth flow rate value Q4= QMAX；
First pressure value P1=δ/QMAX；
Second pressure value
Third pressure value P3=（1-ΔA）PMAX
A fourth pressure value P4= PMAX；
The first and second reduction amounts Δ a and Δ B are constant values set in advance.
2. The control method according to claim 1, wherein the first decrease amount Δ a =0.1, and the second decrease amount Δ B = 0.5.
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| CN111896719A (en) * | 2020-07-14 | 2020-11-06 | 中国水利水电第五工程局有限公司 | Method for detecting curtain grouting quality by GIN (cement in-situ) grouting method |
| CN111962515B (en) * | 2020-08-19 | 2021-06-08 | 中国水电基础局有限公司 | Self-adaptive grouting control method |
| CN113296406B (en) * | 2021-05-19 | 2024-04-09 | 长江水利委员会长江科学院 | Grouting alarm control method combining convergence domain judgment with threshold value |
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| CN105133616A (en) * | 2015-08-19 | 2015-12-09 | 华能澜沧江水电股份有限公司 | Distorted concrete hole forming and grouting integrated machine |
| CN108678375B (en) * | 2018-04-17 | 2020-07-17 | 中国水利水电第九工程局有限公司 | Grouting construction process using GIN grouting method |
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