A Construction Method for Comprehensive Exploration and Treatment of Unfavorable Geological Surrounding Rocks of Tunnels
A construction method and surrounding rock technology, applied in tunnels, earthwork drilling, geophysical surveying, etc., can solve the problems of low precision, large errors, and many interference factors, and achieve the effect of ensuring safety and quality and great promotion value
Active Publication Date: 2020-01-10
GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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Problems solved by technology
For example, the commonly used TSP technology has a detection range of 100-150m, but the accuracy is low and the error is large, especially for irregular geological bodies or unfavorable geological bodies parallel to the tunnel axis, such as cylindrical or conical caves, underground rivers and water-bearing conditions Detection is limited
Within the detection range of ground radar within 30m, due to many interference factors, false anomalies are often caused, resulting in misjudgment
The effective detection range of existing common horizontal drilling equipment is 50-60m
Method used
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Embodiment
[0025] combine Figure 1-5 As shown, the technical solution adopted in this embodiment is:
[0026] The circular exploration construction method is adopted, including the following steps:
[0027] Step 1: Carry out risk assessment using comprehensive advanced detection technology, and after initially determining a large or extra large unfavorable geological body 1, treat the large or extra large unfavorable geological body 1 as a "black box" area 2; the advanced detection method can use TSP Geophysical prospecting methods such as geological radar and horizontal drilling method are used to predict the surrounding rock of tunnel 3 in advance, and initially determine the scale and nature of unfavorable geological bodies. Think of it as the "black box" area 2.
[0028] Step 2: Under the condition of limited technical level and resources, carry out key detection on the key parts in the "black box" area 2, the key detection range is about 30m in front of the tunnel face, and the r...
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The invention discLoses a tunneL unfavorabLe geoLogy surrounding rock comprehensive probing treating construction method. FirstLy, a comprehensive advanced probing technoLogy is utiLized to initiaLLydetermine a Large-size or super-Large size unfavorabLe geoLogic body, the unfavorabLe geoLogic body is taken as a 'bLack box' area, conditions of engineering geoLogy of an about 30 m range in front ofa face are probed in detaiL, the range is pre-reinforced to form 'advanced man-made surrounding rock', then tunneLing and excavation are conducted, in the process, probing dead areas are probed, andthe pre-reinforcing effect is detected; in order to ensure the safety of the face effect, the advanced man-made surrounding rock of 8-10 m needs to be reserved in front of the face and is taken as a reserved safe LaccoLite for the next circuLar probing treating construction. The method is appLicabLe to the construction of Large-size or super-Large size unfavorabLe geoLogy tunneLs, when the construction is conducted in a tunneL with the high safe risk, the principLes that 'excavation cannot be conducted before probing, and key parts shouLd be probed and reinforced' can be stuck to, the safety and quaLity of tunneL construction are ensured, and Larger popuLarizing vaLue is achieved in the construction of Large-size or super-Large size unfavorabLe geoLogy tunneLs.
Description
technical field [0001] The invention relates to the field of tunnel geology, in particular to a construction method for comprehensive exploration and treatment of unfavorable geological surrounding rocks of tunnels. Background technique [0002] Tunnel engineering is a kind of underground engineering. Although the geological conditions of the tunnel have been explored and evaluated to a certain extent in the tunnel design and engineering geological survey before construction, due to the complexity of the geology, the survey data and the actual situation after tunnel excavation Circumstances may vary considerably. There are a large number of tunnel projects in the field of water conservancy, hydropower and transportation in my country. Geological disasters are the key factors restricting tunnel construction. Often due to the unknown geology in front of the tunnel and the inability of survey data to completely and accurately reflect the geological conditions in front of the co...
Claims
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IPC IPC(8): E21D9/00E21F16/02G01V9/00
CPCE21D9/00E21D9/001E21F16/02G01V9/00
Inventor 李志堂陈培冲谭博盛高红军孟亚锋徐光波赵明王林王元扩黎水昌白伟元德壬张博宇陈兰江
Owner GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG