Graded Plugging Dams for Single-Side Separation Grouting
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Solution Overview
Problem
Existing technologies lack a comprehensive method for plugging, monitoring, and reinforcing separation stratum grouting under single-side open conditions, leading to grout flow and migration issues during coal mining, reducing the effectiveness of grouting and filling.
Innovation Solution
A graded plugging, monitoring, and reinforcing integrated method involving the construction of a combined plugging dam using different grades of grout in dam grouting holes, monitored by orifice grouting pressure and geophysical exploration, with local reinforcement if needed, to prevent grout leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separation stratum grouting is performed under single-side open conditions, then the grouting process can be implemented, but grout flows and migrates towards the remaining space of the target separation stratum above the mined area, reducing grouting effectiveness
Solution Approach 1:
The patent constructs a combined plugging dam before performing separation stratum grouting. This preliminary action creates a barrier structure that prevents grout from migrating into the remaining space of the target separation stratum above the mined area, thereby resolving the grout migration issue while maintaining grouting effectiveness
Solution Approach 2:
The combined plugging dam acts as an intermediary structure between the grouting system and the remaining space of the target separation stratum. It mediates the interaction by blocking the migration path of grout, allowing the grouting process to proceed effectively without direct harm to the remaining stratum space
2Reliability
If a combined plugging dam is constructed to prevent grout migration, then grouting effectiveness is improved, but the construction process becomes more complex
Solution Approach 1:
The patent merges multiple functions into the combined plugging dam structure: it combines plugging functions (using grout to block migration paths), dam construction (creating a barrier structure), and monitoring functions (using orifice pressure and geophysical exploration). This integration achieves effective grout migration prevention while managing construction complexity through functional consolidation
Solution Approach 2:
The combined plugging dam serves multiple purposes simultaneously: it plugs grout migration paths, acts as a barrier dam, provides monitoring access points (orifice pressure measurement), and enables geophysical exploration for effectiveness verification. This multi-functionality reduces the need for separate structures, thereby managing overall system complexity
3Reliability
If monitoring and reinforcement are performed after grouting, then grouting effectiveness is verified and improved, but the process time and cost increase
Solution Approach 1:
The patent implements a feedback mechanism where orifice pressure monitoring and geophysical exploration are performed to verify grouting effectiveness. Based on this feedback, reinforcement decisions are made only when necessary. This feedback loop ensures grouting effectiveness is verified while avoiding unnecessary reinforcement work that would waste time and resources
Solution Approach 2:
The patent uses parameter changes in the monitoring process, specifically measuring orifice pressure and geophysical properties to assess grouting effectiveness. By changing these parameters for measurement purposes, the system can verify grouting quality without requiring extensive time-consuming reinforcement operations, only initiating reinforcement when parameter analysis indicates a need
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively isolates the remaining space of the target separation stratum, enhances grouting effectiveness, reduces costs, and ensures rapid plugging when leakage occurs, using a combination of grout materials and monitoring techniques.
Implementation Method 1
The combined plugging dam constructed can effectively prevents the grout from flowing and migrating towards the remaining space of the target separation stratum above the mined area
Implementation Method 2
a monitoring device is placed inside the drilling hole to monitor changes in resistivity before and after grouting
Implementation Method 3
monitoring of grout migration and coagulation in goaf areas
Data Source
AI summary
Disclosed is a graded plugging, monitoring and reinforcing integrated method for separation stratum grouting under single-side open conditions, falling within the technical field of coal mine filling and mining. The method specifically includes the following steps: analyzing the development law of a separation stratum, determining the scope of protective coal pillars for a surface building/structure, constructing a combined plugging dam, monitoring and evaluating the combined plugging dam, and implementing local reinforcement measures. The combined plugging dam proposed in the present disclosure can effectively prevent grout from flowing and migrating towards the remaining space of a target separation stratum above a mined area during grouting under single-side open conditions, enhancing the effectiveness of separation stratum grouting.