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Bolting and injecting quality evaluation method for underground engineering

A technology for underground engineering and quality evaluation, which is applied in the direction of earthwork drilling, installation of bolts, instruments, etc., can solve the problems of inability to take cores, broken surrounding rock, etc., to achieve comprehensive evaluation results, overcome inaccuracy, and evaluation methods more novel effects

Active Publication Date: 2015-08-26
SHANDONG UNIV +1
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Problems solved by technology

[0004] The purpose of the present invention is to solve the above problems, and proposes a method for evaluating the anchoring and grouting quality of underground engineering. This method introduces static rotary cutting technology into the anchoring and grouting quality evaluation of surrounding underground engineering for the first time, avoiding the surrounding rock being broken and unable to Coring Defects

Method used

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  • Bolting and injecting quality evaluation method for underground engineering
  • Bolting and injecting quality evaluation method for underground engineering
  • Bolting and injecting quality evaluation method for underground engineering

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Embodiment approach

[0055] Step 1: Surrounding rock detection scheme design before and after grouting;

[0056] According to the geological conditions of the underground cavern site, section size and grouting parameters, design the surrounding rock detection plan before and after grouting, determine the number of drilling holes, orientation, diameter, depth, length of detection area, height and other parameters, and arrange n in different sections drill holes. Such as figure 2 As shown, ①~⑨ are the drilling numbers of the surrounding rock.

[0057] The second step: data collection before grouting;

[0058] Diamond drill bits and double-layer core tubes are used to drill in the surrounding rock, and cores are taken continuously, the coring length is counted, and the coring rate QXL of the surrounding rock is calculated; the triaxial compression test of the surrounding rock specimen is carried out indoors, and the calculation test angle of internal friction Cohesion c and residual strength σ ...

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Abstract

The invention discloses a bolting and injecting quality method for underground engineering. The evaluation method comprises the following steps: acquiring data before grouting; acquiring data after grouting; according to the data acquired before and after grouting, respectively calculating the borehole coring increasing rate K1, the internal friction angle increasing rate K2, the cohesive force increasing rate K3, the residual strength increasing rate K4, the wave velocity increasing rate K5, the releasing range reduction ratio K6, the drilling pressure increasing rate K7 and the torque increasing rate K8 before and after grouting; utilizing a weight analysis method to establish the quantitative evaluation indexes of the rock mass strength before and after grouting, so as to perform quantitative evaluation on the bolting and injecting quality of surrounding rock, and comparing the quantitative evaluation value with an on-site bolting and injecting quality statistic standard value. The bolting and injecting quality evaluation method for underground engineering has the benefits as follows: the method belongs to multi-factor comprehensive evaluation methods, overcomes the defect that the conventional single-factor method is low in accuracy, and enables the evaluating effect to be more comprehensive and reasonable.

Description

technical field [0001] The invention relates to the technical field of grouting, in particular to a quality evaluation method for anchor grouting in underground engineering. Background technique [0002] Since the invention of grouting technology, it has been widely used to block water gushing and improve strata, and has played a good role in all aspects of infrastructure construction. It is very common to use grouting to deal with various geotechnical problems. For example: dam grouting reinforcement and waterproofing, building foundation underpinning, tunnel and subway engineering, shield tunneling, foundation pit engineering, pipeline protection tracking grouting reinforcement, shaft grouting, well construction through aquifer grouting, Reinforcement of bridge cable support rock mass, and other special engineering applications. It can be predicted that with the greater development of various construction projects, the demand for grouting technology will increase day by d...

Claims

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Application Information

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IPC IPC(8): G06F19/00E21D20/02
Inventor 王琦李术才江贝高松任尧喜邵行王新潘锐解洪兵曾艳君王德超丁国利姜作华邹玉龙王富奇张世国于恒昌张开闫凯
Owner SHANDONG UNIV
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