Anchor rod ultimate anti-pull force design parameter optimization design method under different expansion agent contents in rock and soil masses

A technology of design parameters and optimized design, applied in the direction of excavation, sheet pile wall, foundation structure test, etc., to achieve the effect of improving the pullout resistance of anchor bolts, broad engineering application prospects and promotion value, and reducing engineering costs

Active Publication Date: 2018-07-20
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, the expansion cement slurry is gradually applied in the support engineering, and the expansion cement slurry can be used as the anchor body of the bolt, and its lateral expansion performance can be used to improve the pullout resistance of the bolt, and it can also meet the actual needs of the project and save energy. Raw materials, this application has significant economic benefits in rock mass anchoring technology; however, in current engineering applications, the calculation of the ultimate pull-out force of the anchorage body of expanded cement slurry is a key issue that needs to be considered by engineering design and construction personnel, and it is also There is no effective calculation method for the obstacles encountered in engineering applications

Method used

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  • Anchor rod ultimate anti-pull force design parameter optimization design method under different expansion agent contents in rock and soil masses
  • Anchor rod ultimate anti-pull force design parameter optimization design method under different expansion agent contents in rock and soil masses

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: Select experimental materials such as cement, expansion agent, and steel bars according to actual engineering needs, and select a suitable anchorage slope;

[0036] Step 2: Drill holes at an angle of 60° between the slope and the slope surface, with a depth of 60cm and a diameter of 8cm;

[0037] Step 3: Prepare two groups of cement slurries with different expansive agent content according to the experimental requirements, the first group, cement 100g, expansive agent 0g; the second group, cement 850g, expansive agent 150g, three groups of materials are heated with water (50 degrees Celsius ) in an appropriate amount to be prepared into cement slurry without expansion agent and expansion cement slurry with expansion agent content of 15%;

[0038] Step 4: Put a steel bar in the middle of the slope hole, first pour 57.5cm high expansion cement slurry with different contents into the hole, and then pour 2.5cm high plain cement slurry to seal;

[0039] Step 5: Afte...

Embodiment 2

[0045] Step 1: Select experimental materials such as cement, expansion agent, and steel bars according to actual engineering needs, and select a suitable anchorage slope;

[0046] Step 2: Drill holes at an angle of 60° between the slope and the slope surface, with a depth of 60cm and a diameter of 8cm;

[0047] Step 3: Prepare two groups of cement slurries with different expansion agent contents according to the experimental requirements. Group 1, cement 100g, expansion agent 0g; Group 2, cement 850g, expansion agent 150g. Add an appropriate amount of warm water (fifty degrees Celsius) to the three groups of materials to prepare the cement slurry without expansion agent and the expansion cement slurry with expansion agent content of 15%;

[0048] Step 4: Put a steel bar in the middle of the slope hole, first pour 57.5cm high expansion cement slurry with different contents into the hole, and then pour 2.5cm high plain cement slurry to seal;

[0049] Step 5: After the cement is...

Embodiment 3

[0055] Step 1: Select experimental materials such as cement, expansion agent, and steel bars according to actual engineering needs, and select a suitable anchorage slope;

[0056] Step 2: Drill holes at an angle of 60° between the slope and the slope surface, with a depth of 60cm and a diameter of 8cm;

[0057] Step 3: Prepare two groups of cement slurries with different expansion agent contents according to the experimental requirements. The first group contains 100g of cement and 0g of expansion agent; the second group contains 850g of cement and 150g of expansion agent. Add an appropriate amount of warm water (fifty degrees Celsius) to the three groups of materials to prepare the cement slurry without expansion agent and the expansion cement slurry with expansion agent content of 15%;

[0058] Step 4: Put a steel bar in the middle of the slope hole, first pour 57.5cm high expansion cement slurry with different contents into the hole, and then pour 2.5cm high plain cement sl...

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Abstract

The invention relates to an anchor rod ultimate anti-pull force design parameter optimization design method under different expansion agent contents in rock and soil masses. According to acquisitionsof field experiments, the anchor rod ultimate anti-pull force of a rock mass reaches 147 percent of the anti-pull force of ordinary cement or above; the anchor rod ultimate anti-pull force of a soil mass reaches 179 percent of the anti-pull force of ordinary cement or above; and known that compared with the traditional anchoring technology, for a expansion cement slurry anchoring technology, the anchor rod anti-pull force is greatly improved. The expansion cement mortar anchoring technological design parameter optimization design method performs calculation and analysis from three aspects of soil layer and anchoring force, steel bar strength and M30 mortar and correspondingly reduces the drilling diameter, the steel bar cross section and the drilling depth under the condition of ensuring invariable anchorage body ultimate anti-pull force. In the premise of ensuring the engineering safety, anchor rod design parameters are optimized, and the method can remarkably lower the engineering cost and has wide engineering application prospect and popularization value.

Description

technical field [0001] The invention provides a method for optimizing the design parameters of the ultimate pullout force design parameters of rock and soil under different expansion agent contents, which belongs to the field of geotechnical engineering edge support and is suitable for researching expansion cement slurry anchoring technology compared with traditional anchoring technology , the change in the pullout force of the anchor. Background technique [0002] When the expansion agent is added to the cement, when the cement sets, the volume expands accordingly, which plays the role of compensating shrinkage and tensioning the steel bar to generate prestress and fully filling the cement gap, in order to improve some related properties of the concrete in the project. It can be widely used in reinforced concrete structural projects related to waterproofing, such as underground, hydraulic engineering, marine engineering, subways, tunnels, etc. During use, it can improve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/68E02D17/20E02D33/00
Inventor 刘杰张罗送童元申申继辉兰俊王连高进孙涛黎照高素芳付玲莉付晓茜郑芊李昌海付鑫谢元元
Owner CHINA THREE GORGES UNIV
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