해상 풍력 지반조사 (대만)
영신컨설턴트 (02) 529 8803 ystcha@naver.com 2022 7
화석연료에서 해상풍력으로 전환
As global concerns increase about the pace of energy transition in accounting for long-term climate risks, the shift from fossil-based energy production to renewable sources, like wind, has been accelerated. Within Taiwan, the national offshore wind allocation plan has set a target of increasing local production to 20GW by 2035.
해상풍력 문제점,
반복 횡하중에 의한 지지력 감소, 액상화
In fact, leaving out the influence of variable lateral aerodynamic loads, the greater challenges lie within the highly complex and dynamic coastal environment. A major cost driver for the offshore wind energy industry in Taiwan is the geological uncertainties.
Some of the identified risks include: the effect of sloping areas of soft soils, seabed motion, complex marine strata, steep topography, obstructions, seismic activity, soil liquefaction and the presence of flammable or toxic gases. These crucial variables are quite often difficult to design for and the information is typically unavailable.
조사내용, 강도 강도 감소, 감쇄, 응력이력, 변형
This requires an understanding of the mechanical characteristics and dynamic properties of the soil, these include: modulus strength, modulus degradation, damping, stress history and deformation in different locations. Most importantly, accurate test results need to be delivered to the design contractors in a timely manner. This has led to the first geotechnical laboratory for offshore soil mechanics testing being established in Taiwan.
해상풍력조사를 위한 실내시험 보유 장비와 수량
GDS SOIL MECHANICS APPARATUS Quantity
삼축시험 Triaxial Automated System (TAS) with 10, 16 and 25kN load cells 6
전단파 속도 Bender Element System (BES) 3
정변형률 압밀시험 Consolidation Constant Rate of Strain cell (CRS) 2
압밀시험 Automatic Oedometer System (AOS) 10
진동삼축 Enterprise Level Dynamic Triaxial Testing System (ELDYN) (5Hz / 10kN) 5
진동삼축 Advanced Dynamic Triaxial Testing System (DYNTTS) (5Hz / 10kN) 1
전단시험 Electromechanical Dynamic Cyclic Simple Shear Device (EMDCSS) (5Hz/10kN) 3
공진주 시험 Resonant Column Apparatus (RCA) 3
링전단시험 Ring Shear Apparatus (RSA) (5kN/200Nm) 1
해상풍력 시험 내용
• Unconsolidated-Undrained Triaxial Compression Test (UU). 비압밀 비배수 강도
• Consolidated Undrained Triaxial Compression Test (CU). 압밀 비배수 강도
• Consolidated Drained Triaxial Compression Test (CD). 압밀 배수 강도
• Direct Shear Test Under Consolidated. 전단강도
• Consolidation with Incremental Loading. 압밀
• Measurement of Hydraulic Conductivity of Saturated Porous Materials. 투수시험
• Load Controlled Cyclic Triaxial Strength (CUcyc). 하중제어 진동삼축시험
• Determination of the Modulus and Damping Properties of Soils
Using the Cyclic Triaxial Apparatus. 진동삼축 탄성계수 감쇄계수
• Modulus and Damping of Soils by Fixed-Base Resonant Column Devices. 공진주시험
• Determination of Shear Wave Velocity and Initial Shear Modulus
In Soil Specimens ft. Bender Elements. 삼축시료 전단탄성계수
• Torsional Ring Shear Test to Determine Drained Residual Shear Strength
of Fine-Grained Soils 잔류강도
반복진동 시험 예
시료
fine grained silt with low plasticity.
The sample was recovered from a depth of around 8.3 meters below the seabed.
The initial water content was 27.5%,
the initial dry unit weighed around 1.61 t/m3.
saturation B Value of 0.95,
the consolidation stress was set to 100kPa,
the cyclic amplitude and stress ratio (CSR) were set to 40kPa and 0.2.
Following the specifications of ASTM D5311,
to assess the liquefaction potential of this specimen. As shown,
failure occurs at cycle 15 defined by the development of the build-up of excess pore pressure.
15회 진동에서 액상화 발생, 연직변형 증가, 연직 축차응력 감소, 간극수압 증가
Apparatus
Consolidation Constant Rate of Strain cell
Enterprise Level Dynamic Triaxial Testing System
Advanced Dynamic Triaxial Testing System
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