阅读说明：本技术 一种新建地铁施工邻近既有车站结构的立体智能化监测方法 (Three-dimensional intelligent monitoring method for structure adjacent to existing station in newly-built subway construction ) 是由 孙亮 屈军平 刘石 曹保利 刘春梅 张�林 张亚军 何占江 杨钦峰 叶千军 刘保 于 2021-06-10 设计创作，主要内容包括：一种新建地铁施工邻近既有车站结构的立体智能化监测方法,该方法是针对空间监测点选取的一种优化,通过对地铁施工区域与既有车站之间选取不同的监测断面,并在同一监测断面上选取多个监测点并进行钻孔,对孔内布设测斜仪和沉降仪等仪器,从而得到既有车站附近土体的沉降变形情况,根据所得的土体监测数据,对前期建立的关于既有车站与地铁施工的预测模型进行修正,在既有车站侧墙处设置倾斜仪等监测仪器对其变形进行监测,并将所得监测数据对修正后的模型校核,从而确定预测模型的准确性,此预测模型实现在不同施工步序下既有车站任意位置处的变形沉降数据的提取,并能提前确定整体施工过程中对既有车站变形影响较大的位置及施工阶段。(A three-dimensional intelligent monitoring method for the structure of an existing station adjacent to newly built subway construction is characterized by selecting different monitoring sections between a subway construction area and the existing station, selecting a plurality of monitoring points on the same monitoring section, drilling holes, arranging inclinometers, settlers and other instruments in the holes to obtain the settlement deformation condition of soil body near the existing station, correcting a prediction model established in the early stage about the existing station and the subway construction according to the obtained soil body monitoring data, arranging inclinometers and other monitoring instruments at the side wall of the existing station to monitor the deformation of the existing station, checking the corrected model by the obtained monitoring data to determine the accuracy of the prediction model, extracting the deformation settlement data of the existing station at any position under different construction steps by the prediction model, and the position and the construction stage which have great influence on the deformation of the existing station in the whole construction process can be determined in advance.)

1. A three-dimensional intelligent monitoring method for a newly built subway construction adjacent to an existing station structure is characterized by comprising the following steps: the method comprises the following steps:

1) determining monitoring sections (3) at different positions from the existing station (1) by combining the position relation between a newly-built subway construction section (2) and the existing station (1) in actual engineering, and respectively selecting horizontal monitoring points and settlement monitoring points on the same monitoring section (3) as soil settlement deformation monitoring points of the section; the monitoring section (3) comprises a first monitoring section, a second monitoring section and a third monitoring section;

2) drilling holes (6) on a first monitoring section and drilling holes (7) on a second monitoring section for the determined monitoring point positions (4), placing inclinometers in the horizontal monitoring point positions (4), and monitoring horizontal deformation conditions of soil bodies at different positions; placing a settlement gauge in the settlement monitoring point position (4) and monitoring the settlement change conditions of soil bodies at different depths in different positions;

3) according to hydrogeological conditions in actual engineering, establishing a finite difference model about an existing station, and analyzing the settlement deformation law of soil bodies (5) near the existing station in different construction stages;

4) comparing and correcting the soil body settlement deformation data obtained by monitoring with a finite difference model, and establishing a deformation deflection prediction model of the existing station;

5) monitoring the stress deformation of a monitoring instrument (8) arranged inside the existing station (1) to obtain deformation data of the existing station (1) in the actual construction process, comparing and checking the deformation data with a prediction model of the existing station (1), verifying the accuracy of the prediction model, forming an accurate prediction model capable of reflecting the deformation of the existing station (1) in real time, and providing early warning and reinforcement guidance for the next construction stage.

Technical Field

The invention relates to intelligent monitoring and early warning of an existing subway station, in particular to a spatial three-dimensional intelligent monitoring method of the existing subway station.

Background

At present, aiming at monitoring the deformation influence of newly-built subway construction on an existing station, instruments such as a total station and a level gauge are generally arranged in the station for monitoring, but in the monitoring mode, the monitoring cost is high, only limited monitoring points can be obtained, various environmental factors in the station can generate non-negligible influence on monitoring, and the final monitoring precision is reduced or the monitoring data is inaccurate; the existing station is monitored in the modes of ground penetrating radar and the like, so that although nondestructive detection can be achieved, only the approximate position of the station can be obtained, and therefore, the obtained settlement deformation data is inaccurate and cannot be used as reference data in actual construction.

Disclosure of Invention

Aiming at the defects of the existing station monitoring method, the invention provides the intelligent space monitoring method which can realize nondestructive monitoring and can ensure the monitoring precision. On the premise of fully considering the space positions of a newly-built subway and an existing station, a prediction model about the deformation and deflection of the existing station is formed on the basis of a space monitoring point distribution optimization scheme, so that the deformation and deflection conditions of the existing station at different positions are reflected.

A three-dimensional intelligent monitoring method for a newly built subway construction adjacent existing station structure is characterized in that a space monitoring point is selected to be optimized, different monitoring sections are selected between a subway construction area and an existing station, a plurality of monitoring points are selected on the same monitoring section and drilled, inclinometers, settlers and other instruments are arranged in holes, so that the settlement deformation condition of soil bodies near the existing station is obtained, a prediction model which is established in the early stage and is related to the existing station and the subway construction is corrected according to the obtained soil body monitoring data, the monitoring instruments such as the inclinometers and the like are arranged at the side wall of the existing station to monitor the deformation of the existing station, the corrected model is checked by the obtained monitoring data, so that the accuracy of the prediction model is determined, the obtained prediction model is the prediction model which finally reflects the deformation and settlement of the existing station, and the prediction model can realize the optimization of the deformation and settlement data at any position of the existing station under different construction steps And extracting, and determining the position and construction stage with great influence on the deformation of the existing station in the whole construction process in advance.

The selection of the monitoring section is to select the monitoring section which is less influenced by external conditions and does not influence actual construction according to the actual position relation between the subway construction area and the existing station.

The monitoring points are drilled, the drilling depth needs to be determined according to the depth of an actual existing station, the drilling depth is larger than or equal to the depth of the existing station according to the specified requirement, and then the prediction models of the existing stations at different depths can be corrected according to the deformation data of the soil bodies at different depths.

The layout of the inclinometer and the settlement gauge is that the gauges are respectively erected on different drill holes on the same section, and the purpose is to monitor the settlement deformation value of the soil body on the same section.

And the establishment of the early-stage existing station prediction model needs to comprehensively consider the geological conditions and precipitation conditions of the actual construction interval and is established according to different construction steps.

And the correction of the prediction model is to modify and correct the measured settlement deformation data of the soil body of each section to the data obtained by simulating the same position in the prediction model, so as to obtain the prediction model capable of reflecting the actual deformation condition of the existing station.

Monitoring of the existing station requires arrangement of monitoring instruments on a section which is close to the newly-built subway construction in the station, so that data which are greatly influenced by construction are obtained, monitoring accuracy is improved, and model correction precision is improved.

And the obtained prediction model is checked, and the prediction model is further checked and corrected through the deformation data of the existing station obtained through monitoring, so that a model capable of reflecting the deformation of the existing station in real time is finally obtained, and the key position and the unfavorable construction link of the existing station in construction are determined.

Compared with the prior art, the invention has the following beneficial effects:

1. compared with the traditional monitoring mode, the invention can realize the nondestructive monitoring of the existing station, and the deformation settlement amount of the soil body at different sections away from the station can be obtained by drilling and erecting instruments on the surrounding soil body;

2. because people flow in the station is dense, the subway can generate deformation influence on the station during subway operation, and the monitoring can be carried out only during the off-line period of the subway at night, the discontinuity exists in the monitoring, and the monitoring result is inaccurate, but the invention avoids the monitoring mode, monitors soil outside and can improve the monitoring precision;

3. the drilling mode adopted by the invention can monitor the horizontal deformation and the vertical settlement of soil bodies at different depths, and can correct the prediction model more accurately;

4. the invention combines the space monitoring data with the numerical simulation analysis to obtain a prediction model, provides a powerful theoretical basis for the subsequent construction monitoring, and can simulate different construction stages at the same time to early warn the construction stage with larger influence on the deformation of the existing station.

Drawings

Fig. 1 is a schematic plane view of intelligent monitoring of an existing station space in the invention.

Fig. 2 is a schematic cross-sectional view of the intelligent monitoring of the existing station space in the invention.

Fig. 3 is a cross-sectional view of the calibration monitoring point of the existing station in the present invention.

Wherein, 1-existing station; 2, newly building a subway construction interval; 3-monitoring the section; 4-monitoring the point location; 5-soil body near the existing station; 6-drilling on the first monitoring section; 7-drilling on the second monitoring section; 8-existing station internal monitoring points.

Detailed Description

Referring to fig. 1, 2 and 3, a method for three-dimensional intelligent monitoring of a structure adjacent to an existing station in newly built subway construction includes:

1) as shown in fig. 1 and 2, determining a monitoring section 3 at different positions from an existing station 1 by combining the position relationship between a newly-built subway construction section 2 and the existing station 1 in an actual project, and respectively selecting a horizontal monitoring point and a settlement monitoring point on the same monitoring section 3 as soil settlement deformation monitoring points of the section; the monitoring section 3 comprises a first monitoring section, a second monitoring section and a third monitoring section;

2) drilling 6 on a first monitoring section and 7 on a second monitoring section for the determined monitoring point location 4, placing an inclinometer in the horizontal monitoring point location 4, and laying an inclinometer to monitor the horizontal deformation condition of the soil body at different positions; placing a settlement gauge in the settlement monitoring point 4, and monitoring the settlement change conditions of soil bodies at different depths in different positions;

3) establishing a finite difference model about the existing station according to the hydrogeological condition in the actual engineering, and analyzing the settlement deformation rule of the soil body 5 near the existing station in different construction stages;

4) comparing and correcting the soil body settlement deformation data obtained by monitoring with a finite difference model, and establishing a deformation deflection prediction model of the existing station;

5) as shown in fig. 3, the monitoring instrument 8 arranged inside the existing station 1 monitors the stress deformation of the existing station 1 to obtain deformation data of the existing station 1 in the actual construction process, the deformation data is compared and checked with the prediction model of the existing station 1, the accuracy of the prediction model is verified, an accurate prediction model capable of reflecting the deformation of the existing station 1 in real time is formed, and early warning and reinforcement guidance are provided for the next construction stage.