Upstream Tailings Dam Stability Evaluation via On-Site Sampling
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Solution Overview
Problem
The upstream tailing fill dam presents challenges due to its blurred boundary between coarse and fine particle tailings, poor intergranular strength, and varying technological properties, making survey and stability evaluation difficult, especially during drilling and long-distance transportation of undisturbed soil samples.
Innovation Solution
A method involving the selection of appropriate drill bits and soil samplers, collection of tailing sand at different depths, detection of undisturbed soil samples, and evaluation of particle composition and mechanical properties to construct a stability evaluation function, along with preserving techniques to maintain sample integrity during transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional drilling methods are used for upstream tailing fill dam, then drilling operation can be performed, but hole wall collapses easily and drilling efficiency is low due to poor intergranular structure strength
Solution Approach 1:
The patent applies parameter changes by modifying the drilling parameters (rotational speed, feed rate, depth increments) and using different drill bit types (diamond core drill bits, carbide-tipped drill bits) suited for different depth ranges and tailing properties. This resolves the contradiction by optimizing drilling parameters to minimize disturbance and maintain hole wall stability while achieving acceptable drilling efficiency.
Solution Approach 2:
The patent segments the drilling process into multiple stages: shallow drilling (0-5m) using one type of drill bit, deep drilling (5-10m) using another type, and very deep drilling (10m+) with specific parameters. This segmentation allows each stage to use optimized parameters for that depth range, preventing hole wall collapse while maintaining overall drilling efficiency.
2Measurement precision
If undisturbed soil samples are collected for analysis, then accurate stability evaluation can be achieved, but samples deteriorate during long-distance transportation due to poor intergranular strength
Solution Approach 1:
The patent applies preliminary action by conducting all sampling, testing, and analysis operations directly at the dam site before transportation is needed. Undisturbed soil samples are collected using specialized samplers, tested immediately for particle composition and mechanical properties, and only stable reference samples are transported to laboratories. This eliminates the transportation problem while maintaining measurement precision.
Solution Approach 2:
The patent uses an intermediary approach by establishing a on-site testing laboratory equipped with portable testing devices. This intermediary facility allows samples to be tested immediately upon collection, eliminating the need for long-distance transportation of unstable samples while maintaining full measurement precision through on-site analysis.
3Measurement precision
If detailed particle composition and mechanical property analysis are performed, then accurate stability evaluation is achieved, but survey complexity and time consumption increase
Solution Approach 1:
The patent replaces complex mechanical laboratory testing systems with portable electronic testing devices that can be deployed on-site. Particle composition is analyzed using portable spectroscopic devices, and mechanical properties are measured using handheld geotechnical testers. This substitution maintains measurement precision while dramatically reducing survey system complexity and enabling rapid field analysis.
Solution Approach 2:
The patent applies self-service by using automated testing devices that perform measurements and calculations without requiring complex manual procedures. The portable equipment automatically analyzes samples, processes data, and generates stability evaluation results, reducing the need for complex survey systems and highly specialized operators while maintaining high measurement precision.
Data Source
AI summary
The present disclosure relates to the field of survey and stability evaluation of a tailing fill dam, in particular to a method and system for survey and stability evaluation of an upstream tailing fill dam, wherein the method comprises the following steps: selecting a drill bit and a soil sampler for a target tailing fill dam; collecting tailing sand at different depths of the target tailing fill dam using the drill bit and the soil sampler; detecting an undisturbed soil sample of the tailing sand; setting a preset standard according to the undisturbed soil sample, and screening the tailing sand using the preset standard to obtain a tailing sand sample; detecting the particle composition of the tailing sand sample; detecting the mechanical property of the tailing sand sample; and evaluating the stability of the target tailing fill dam through the particle composition and the mechanical property.