Foundation pit engineering risk grade evaluation method and system based on field monitoring

Abstract

The invention relates to the technical field of foundation pit engineering computer-aided methods in the underground space field, in particular to a foundation pit engineering risk grade evaluation method and system based on field monitoring. The method comprises the following steps: obtaining a monitoring type for foundation pit risk grade evaluation, and calculating an actually measured type risk grade corresponding to the monitoring type; obtaining risk level influence factors of each monitoring type; calculating the actual measurement risk level of each monitoring type, wherein the actual measurement risk level of each monitoring type is equal to the influence factor divided by the total influence factor and then multiplied by the actual measurement type risk level; and determining the risk grade of the foundation pit according to the actually measured risk grade of each monitoring type. According to the method, the risk grade of the foundation pit can be comprehensively and quantitatively evaluated on the basis of various parameters, accurate analysis is facilitated, computer aided design can be carried out on the basis of the conception, and efficient risk grade evaluation is achieved through software.

Description

Technical Field

[0001] The present invention relates to the technical field of computer-aided methods for foundation pit engineering in the field of underground space, and in particular to a method and system for risk level assessment of foundation pit engineering based on on-site monitoring. Background Art

[0002] Existing technology generally involves conducting a field survey before foundation pit construction. Using standards, experience, and design, control values, alarm values, and early warning values ​​are determined for each monitoring item, allowing for a preliminary assessment of the project's risk level. Typically, the alarm value is 85% of the control value, and the early warning value is 70% of the control value. Various monitoring points are set up, and monitoring instruments are used to monitor the internal forces and displacements of the project structure, as well as the settlement of surrounding groundwater, buildings, and pipelines. Field data is collected and analyzed, and the project's current status is determined based on the monitoring results, leading to the implementation of appropriate measures to ensure project safety.

[0003] Existing technologies for determining risk levels are mostly empirical and lack comprehensive quantitative assessment standards, making computer-assisted determination difficult. Furthermore, during construction, foundation pits are often in a dangerous state due to factors such as construction conditions, the layout of various construction machinery, and precipitation. Therefore, construction parties need to take preventive measures in advance. However, they can only determine the risk level of foundation pits based on a single or limited set of data, and cannot comprehensively determine the risk level of foundation pits by analyzing all monitoring data. Summary of the Invention

[0004] By analyzing the shortcomings of existing technologies, this paper proposes a method and system for assessing foundation pit project risk levels based on on-site monitoring. This method uses on-site measurements to reflect the project's specific state under specific construction conditions. It enables quantitative evaluation based on multiple parameters, facilitating precise analysis. This approach also enables computer-aided design based on the concepts of this invention, enabling efficient risk assessment through software.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a method for assessing the risk level of foundation pit engineering based on on-site monitoring, comprising:

[0006] Step 1: Obtain the monitoring type used for foundation pit risk level assessment, calculate the measured risk level corresponding to the monitoring type, and then proceed to step 2;

[0007] Step 2: Obtain the risk level influencing factors of each monitoring type, and then proceed to step 3;

[0008] Step 3: Calculate the measured risk level of each monitoring type. The measured risk level of each monitoring type is equal to the impact factor divided by the total impact factors, and then multiplied by the measured type risk level; determine the risk level of the foundation pit based on the measured risk level of each monitoring type.

[0009] As preferred aspects of the present invention, the monitoring types include: deep horizontal displacement of retaining walls, deep horizontal displacement of soil, surface settlement, horizontal displacement of surface soil, support axial force, column heave, groundwater level, wall top settlement, building vertical displacement, building horizontal displacement, building inclination, pipeline vertical displacement, pipeline horizontal displacement, retaining wall (pile) internal force, pit bottom heave, steel bar stress, waist beam internal force, and anchor rod axial force.

[0010] As a preferred embodiment of the present invention, the value of the measured type risk level is obtained by averaging the risk levels of each monitoring point, and the risk level of each monitoring point is obtained by weighted summation according to the rate risk level and the cumulative amount risk level.

[0011] As a preferred embodiment of the present invention, the cumulative amount risk level is equal to the current cumulative amount divided by the cumulative amount alarm value, and the rate risk level is equal to the current change rate divided by the rate alarm value, wherein the current cumulative amount is the difference between the current measured value and the first measured value, and the current change rate is the difference between the current cumulative amount and the previous cumulative amount.

[0012] As a preferred embodiment of the present invention, the risk level of the monitoring point is equal to 0.4 multiplied by the rate risk level plus 0.6 multiplied by the cumulative amount risk level.

[0013] According to a second aspect of the present invention, a foundation pit engineering risk level assessment system based on on-site monitoring includes at least one processor and a memory communicatively connected to the at least one processor; the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor.

[0014] As a preferred embodiment of the present invention, an electronic device includes a server, a network interface and a memory, wherein the server, the network interface and the memory are interconnected, wherein the memory is used to store a computer program, the computer program includes program instructions, and the server is configured to call the program instructions.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The risk level of the foundation pit can be comprehensively and quantitatively evaluated based on multiple parameters, which is conducive to accurate analysis. Computer-aided design can be performed based on the concept of the present invention, and efficient risk level assessment can be achieved through software. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flow chart of the method for assessing the risk level of foundation pit engineering based on on-site monitoring in Example 1 and a schematic structural diagram of the present invention. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0019] Example 1

[0020] The method of risk level assessment of foundation pit engineering based on on-site monitoring is as follows: Figure 1 Shown, including:

[0021] Step 1: Obtain the monitoring type used for foundation pit risk level assessment and calculate the measured risk level corresponding to the monitoring type. The monitoring types include: deep horizontal displacement of retaining wall, deep soil horizontal displacement, surface settlement, surface soil horizontal displacement, support axial force, column heave, groundwater level, wall top settlement, building vertical displacement, building horizontal displacement, building inclination, pipeline vertical displacement, pipeline horizontal displacement, retaining wall (pile) internal force, pit bottom heave, steel bar stress, waist beam internal force, anchor rod axial force, and then proceed to step 2.

[0022] Step 2: Obtain the risk level influencing factors of each monitoring type, and then proceed to step 3;

[0023] Step 3: Calculate the measured risk level of each monitoring type. The measured risk level of each monitoring type is equal to the impact factor divided by the total impact factors, and then multiplied by the measured type risk level; determine the risk level of the foundation pit based on the measured risk level of each monitoring type.

[0024] The calculation method for the measured risk level corresponding to each monitoring type is as follows:

[0025] 1. Deep horizontal displacement of retaining wall (piles)

[0026] The current cumulative amount and the current rate of change are both data obtained from on-site measurements; the current cumulative amount is the difference between the measured value of the current test and the measured value of the first test, and the current rate of change is the difference between the current cumulative amount and the previous cumulative amount.

[0027] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 30mm);

[0028] Rate risk level = current change rate / rate alarm value (rate alarm value 3mm / d);

[0029] Monitoring point risk level = 0.4*rate risk level + 0.6*accumulated risk level;

[0030] Type risk level = sum of risk levels of each monitoring point / n

[0031] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 1:

[0032] Table 1 Risk level assessment table for deep horizontal displacement of retaining walls (piles) of a certain project

[0033]

[0034] 2. Horizontal displacement of deep soil

[0035] The cumulative amount and the rate of change are all data obtained from on-site measurements;

[0036] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 30mm);

[0037] Rate risk level = current change rate / rate alarm value (rate alarm value 3mm / d);

[0038] Monitoring point risk level = 0.4*rate risk level + 0.6*accumulated risk level;

[0039] Type risk level = sum of risk levels of each monitoring point / n

[0040] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 2:

[0041] Table 2 Risk level assessment table for horizontal displacement of deep soil in a certain project

[0042]

[0043] 3. Surface subsidence

[0044] The cumulative amount and the rate of change are both data obtained from on-site measurements;

[0045] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 40mm);

[0046] Rate risk level = current change rate / rate alarm value (rate alarm value is 6mm / d);

[0047] Monitoring point risk level = 0.4*rate risk level + 0.6*accumulated amount risk level;

[0048] Type risk level = sum of risk levels of each monitoring point / n

[0049] Based on the above formula, we take the measured data of a certain project as the research object, and list the calculation results as shown in Table 3-1:

[0050] Table 3-1 Surface Subsidence Risk Level Assessment Table for a Certain Project

[0051]

[0052] 4. Horizontal displacement of surface soil

[0053] The cumulative amount and the rate of change are both data obtained from on-site measurements;

[0054] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 20mm);

[0055] Rate risk level = current change rate / rate alarm value (rate alarm value 2mm / d);

[0056] Monitoring point risk level = 0.4*rate risk level + 0.6*accumulated risk level;

[0057] Type risk level = sum of risk levels of each monitoring point / n

[0058] Based on the above formula, we take the measured data of a certain project as the research object, and list the calculation results as shown in Table 4-1:

[0059] Table 4 Risk level assessment table for horizontal displacement of surface soil in a certain project

[0060] 5. Support axial force

[0061] The cumulative amount is the data obtained from on-site measurements;

[0062] Cumulative quantity risk level = current cumulative quantity / cumulative quantity alarm value (cumulative quantity alarm 3000kN);

[0063] Type risk level = sum of risk levels of each monitoring point / n

[0064] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 5.

[0065] Table 5: Risk level assessment table of support axial force of a certain project

[0066] 6. The columns are high and low

[0067] The cumulative amount and the rate of change are both data obtained from on-site measurements;

[0068] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 25mm);

[0069] Rate risk level = current change rate / rate alarm value (rate alarm value 3mm / d);

[0070] Monitoring point risk level = 0.4*rate risk level + 0.6*accumulated amount risk level;

[0071] Type risk level = sum of risk levels of each monitoring point / n

[0072] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 6:

[0073] Table 6 Column heave and sink risk level assessment table for a certain project

[0074]

[0075] 7. Groundwater level

[0076] The cumulative amount and the rate of change are both data obtained from on-site measurements;

[0077] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 3000mm);

[0078] Rate risk level = current change rate / rate alarm value (rate alarm value 500mm / d);

[0079] Monitoring point risk level = 0.4*rate risk level + 0.6*accumulated amount risk level;

[0080] Type risk level = sum of risk levels of each monitoring point / n

[0081] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 7:

[0082] Table 7 Groundwater level risk level assessment table for a certain project

[0083]

[0084] 8. Horizontal displacement of wall top

[0085] The cumulative amount and the rate of change are both data obtained from on-site measurements;

[0086] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 25mm);

[0087] Rate risk level = current change rate / rate alarm value (rate alarm value 3mm / d);

[0088] Monitoring point risk level = 0.4*rate risk level + 0.6*accumulated amount risk level;

[0089] Type risk level = sum of risk levels of each monitoring point / n

[0090] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 8:

[0091] Table 8 Risk level assessment table for horizontal displacement of wall top of a certain project

[0092]

[0093] 9. Wall top settlement

[0094] The cumulative amount and the rate of change are both data obtained from on-site measurements;

[0095] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 25mm);

[0096] Rate risk level = current change rate / rate alarm value (rate alarm value 3mm / d);

[0097] Monitoring point risk level = 0.4*rate risk level + 0.6*accumulated amount risk level;

[0098] Type risk level = sum of risk levels of each monitoring point / n

[0099] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 9.

[0100] Table 9 Risk level assessment table for wall top settlement of a certain project

[0101]

[0102] 10. Vertical displacement of buildings

[0103] The cumulative amount and the rate of change are both data obtained from on-site measurements;

[0104] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 25mm);

[0105] Rate risk level = current change rate / rate alarm value (rate alarm value 3mm / d);

[0106] Monitoring point risk level = 0.4*rate risk level + 0.6*accumulated amount risk level;

[0107] Type risk level = sum of risk levels of each monitoring point / n

[0108] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 10:

[0109] Table 10: Risk level assessment table for vertical displacement of buildings in a certain project

[0110]

[0111] 11. Horizontal displacement of buildings

[0112] The cumulative amount and the rate of change are both data obtained from on-site measurements;

[0113] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 25mm);

[0114] Rate risk level = current change rate / rate alarm value (rate alarm value 3mm / d);

[0115] Monitoring point risk level = 0.4*rate risk level + 0.6*accumulated risk level;

[0116] Type risk level = sum of risk levels of each monitoring point / n

[0117] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 11

[0118] Table 11: Risk level assessment table for horizontal displacement of buildings in a certain project

[0119]

[0120] 12. Buildings tilt

[0121] The cumulative amount and the rate of change are both data obtained from on-site measurements;

[0122] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 25mm);

[0123] Rate risk level = current change rate / rate alarm value (rate alarm value 3mm / d);

[0124] Monitoring point risk level = 0.4*rate risk level + 0.6*accumulated risk level;

[0125] Type risk level = sum of risk levels of each monitoring point / n

[0126] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 12:

[0127] Table 12 Assessment table of building tilt risk level for a certain project

[0128]

[0129] 13. Vertical displacement of pipeline

[0130] The cumulative amount and the rate of change are both data obtained from on-site measurements;

[0131] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 30mm);

[0132] Rate risk level = current change rate / rate alarm value (rate alarm value 2mm / d);

[0133] Monitoring point risk level = 0.4*rate risk level + 0.6*accumulated risk level;

[0134] Type risk level = sum of risk levels of each monitoring point / n

[0135] Based on the above formula, we take the measured data of a certain project as the research object, and list the calculation results as shown in Table 13-1:

[0136] Table 13 Pipeline vertical displacement risk level assessment table for a certain project

[0137]

[0138] 14. Horizontal displacement of pipelines

[0139] The cumulative amount and the rate of change are both data obtained from on-site measurements;

[0140] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 30mm);

[0141] Rate risk level = current change rate / rate alarm value (rate alarm value 2mm / d);

[0142] Monitoring point risk level = 0.4*rate risk level + 0.6*accumulated risk level;

[0143] Type risk level = sum of risk levels of each monitoring point / n

[0144] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 14:

[0145] Table 14 Pipeline horizontal displacement risk level assessment table for a certain project

[0146]

[0147] 15. Internal force of retaining wall (pile)

[0148] The cumulative amount is the data obtained from on-site measurements;

[0149] Cumulative quantity risk level = current cumulative quantity / cumulative quantity alarm value (cumulative quantity alarm 3000kN·m);

[0150] Type risk level = sum of risk levels of each monitoring point / n

[0151] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 15:

[0152] Table 15 Risk level assessment table for internal forces of retaining walls (piles) of a certain project

[0153]

[0154] 16. Pit bottom heaves and sinks

[0155] The cumulative amount and the rate of change are both data obtained from on-site measurements;

[0156] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 25mm);

[0157] Rate risk level = current change rate / rate alarm value (rate alarm value 3mm / d);

[0158] Monitoring point risk level = 0.4*rate risk level + 0.6*accumulated risk level;

[0159] Type risk level = sum of risk levels of each monitoring point / n

[0160] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 16:

[0161] Table 16 Pit bottom heave and subsidence risk level assessment table for a certain project

[0162] 17. Steel bar stress

[0163] The cumulative amount is the data obtained from on-site measurements;

[0164] Cumulative amount risk level = current cumulative amount / cumulative amount alarm value (cumulative amount alarm 3000kN / m);

[0165] Type risk level = sum of risk levels of each monitoring point / n

[0166] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 17:

[0167] Table 17 Steel bar stress risk level assessment table for a certain project

[0168] 18. Waist internal force

[0169] The cumulative amount is the data obtained from on-site measurements;

[0170] Cumulative quantity risk level = current cumulative quantity / cumulative quantity alarm value (cumulative quantity alarm 3000kN·m);

[0171] Type risk level = sum of risk levels of each monitoring point / n

[0172] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 18:

[0173] Table 18 Risk level assessment table of waist beam internal force of a certain project

[0174] 19. Anchor rod axial force

[0175] The cumulative amount is the data obtained from on-site measurements;

[0176] Cumulative quantity risk level = current cumulative quantity / cumulative quantity alarm value (cumulative quantity alarm 3000kN);

[0177] Type risk level = sum of risk levels of each monitoring point / n

[0178] According to the above formula, the measured data of a certain project is taken as the research object, and the calculation results are listed as shown in Table 19:

[0179] Table 19 Anchor bolt axial force risk level assessment table for a certain project

[0180] Foundation pit risk level algorithm:

[0181] Based on the risk levels of each of the above monitoring types, a comprehensive analysis of the risk level of the foundation pit under certain working conditions is conducted. The impact factor of the deep horizontal displacement of the retaining wall (piles) on the foundation pit risk level is defined as 1. The factors and risk levels of the remaining monitoring types are shown in Table 20.

[0182] Among them, the impact factor has a greater impact on the measured risk level, so the total impact factor is used.

[0183] Measured risk level = impact factor * measured type risk level / total impact factor

[0184] Table 20 Influence factors of each monitoring type on foundation pit risk level

[0185]

[0186] The measured risk level is the risk level of the foundation pit under this working condition. The specific risk level is shown in Table 21:

[0187] Table 21 Risk Level Assessment Table

[0188] According to Tables 20 and 21 above, the foundation pit is at a low risk level under this working condition. By programming the above calculation method into software and inputting various parameters, the corresponding risk level can be obtained.

[0189] Finally, it should be noted that the embodiments described in detail above are only the best practices of the invention and cannot be used to limit the scope of rights of the invention. Equivalent replacement of the technical solutions recorded in the aforementioned embodiments does not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the invention, and they should all be included in the scope of the claims and description of the invention.

[0190] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0191] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for assessing the risk level of foundation pit engineering based on on-site monitoring, characterized in that: include: Step 1: Obtain the monitoring type used for foundation pit risk level assessment, calculate the measured risk level corresponding to the monitoring type, and then proceed to step 2; Step 2: Obtain the risk level influencing factors of each monitoring type, and then proceed to step 3; Step 3: Calculate the measured risk level of each monitoring type. The measured risk level of each monitoring type is equal to the impact factor divided by the total impact factors, and then multiplied by the measured type risk level; determine the risk level of the foundation pit based on the measured risk level of each monitoring type.

2. The method for assessing foundation pit engineering risk levels based on on-site monitoring according to claim 1, characterized in that: The monitoring types include: deep horizontal displacement of retaining walls, deep horizontal displacement of soil, surface settlement, horizontal displacement of surface soil, support axial force, column heave, groundwater level, wall top settlement, building vertical displacement, building horizontal displacement, building inclination, pipeline vertical displacement, pipeline horizontal displacement, retaining wall (pile) internal force, pit bottom heave, steel bar stress, waist beam internal force, anchor rod axial force.

3. The method and system for assessing foundation pit engineering risk levels based on on-site monitoring according to claim 2, characterized in that: The value of the measured type risk level is obtained by averaging the risk levels of each monitoring point, and the risk level of each monitoring point is obtained by weighted summation according to the rate risk level and the cumulative risk level.

4. A method and system for assessing foundation pit engineering risk levels based on on-site monitoring according to claim 3, characterized in that: The cumulative amount risk level is equal to the current cumulative amount divided by the cumulative amount alarm value, and the rate risk level is equal to the current change rate divided by the rate alarm value, where the current cumulative amount is the difference between the current measured value and the first measured value, and the current change rate is the difference between the current cumulative amount and the previous cumulative amount.

5. The method and system for assessing foundation pit engineering risk levels based on on-site monitoring according to claim 3, characterized in that: The risk level of the monitoring point is equal to 0.4 times the rate risk level plus 0.6 times the cumulative amount risk level.

6. The foundation pit engineering risk level assessment system based on on-site monitoring is characterized by: comprising at least one processor, and a memory communicatively connected to the at least one processor; The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method for assessing the risk level of foundation pit engineering based on on-site monitoring as described in any one of claims 1 to 5.

7. An electronic device, characterized in that: The method comprises a server, a network interface and a memory, wherein the server, the network interface and the memory are interconnected, wherein the memory is used to store a computer program, the computer program includes program instructions, and the server is configured to call the program instructions to execute the method for foundation pit engineering risk level assessment based on on-site monitoring as described in any one of claims 1 to 5.

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