風機對地基強度和抗傾覆的要求-中英對照
The foundation strength and anti-overturning requirement should be satisfied:
（1）全風化帶巖石：由于巖性軟弱強度極低，分布厚度較大時如做風機的天然地基，必須驗算沉降變形等指標。
（1）Completely weathered belt rock: Check indexes of settlement and deformation when selecting it as natural foundation for wind turbine due to its weak intensity.
（2）強風化帶巖石：上部較破碎，中下部巖體漸趨完整，強度漸提高，經采取工程處理措施后，可考慮采用天然地基，但須滿足強度和抗拔的要求。
（2）Heavily-weathered belt rock: The upper part is rather crushed, the lower-middle part rock is quite integrated and the intensity increases bit by bit, which could be considered as natural foundation through engineering treatment, but intensity and anti-pulling requirement shall be met.
（3）弱風化巖石：堅硬度較高，巖體完整性也較好，可采用天然地基若有斷層或裂隙密集帶分布可采取工程處理措施。但須作強度和抗拔驗算。
（3）Weakly-weathered rock: It has high hardness with integrated lithology, which could be taken as natural foundation after engineering treatment on fissure or intensive fissure zone, but check the intensity and anti-pulling capacity firstly.
（4）若個別全風化層較厚，開挖有較大困難可適當移位、必要時也可考慮采用樁基礎，并以弱風化基巖或強風化基巖上部巖體作為樁基持力層。
（4）If some completely weathered layers are thick and there are many difficulties in digging, considering pile foundation is available and taking upper rock body of the weakly-weathered belt rock or heavily-weathered belt rock as pile foundation supporting layer.
（5）在山梁較窄地段，而外側山坡為基巖陡坡，且長大裂隙發育若選擇作風機位置時尚須考慮邊坡穩定問題。
（5）In narrow section of mountain ridge, while lateral side slope is steep slope of bedrock with long and big crack development, taking side slope stability into consideration.
（6）場址區局部地帶可能有斷層和裂隙密集帶，下階段詳勘時應進一步論證其對風電機組基礎的影響。
（6）There are faultage and fissure zone in local part of wind farm location probably, a further demonstration will be performed to find out its influence on foundation of wind turbine unit during next phase.
3.2.4凍土層情況
3.2.4 Permafrost condition
根據實地調查，本地區凍土層厚度約為1.40m。
According to field investigation, the permafrost thickness in this area is about 1.40 m.
3.3結論及建議
3.3 Conclusions and Recommendations
（1）風電場址區域地震動峰值加速度為0.05g，對應的地震基本裂度為Ⅵ度。區域構造穩定性較好。
（1）The acceleration of earthquake peak motion in area of wind farm is 0.05g, and the corresponding Earthquake basic crack grade is VI. The stability of regional structure is fairly good.
（2）場址范圍無崩塌、滑坡分布，無長大緩傾的結構面發育，場址山體的整體穩定性較好，宜選為風電場址。
（2）No collapse, landslide distribution or no long, bid or slightly inclined structural surface development, the integrity of wind farm location is quite good which is fit for building wind farm.
（3）由于組成地基的基巖的風化厚度各地均有差異，風化分帶結構也不相同，因而地基處理措施應分別不同情況對待。
（3）Because the weathered thickness of bedrock for foundation is different and the structure of weathered belt is different, we shall take different measures to deal with foundation.
表3-2 物理力學性質指標建議值表
Table 3-2 Index Suggestion on Physical and Mechanical Property
|
項 目Item 巖 石 類 別 Type |
天然 視密度 (Kg/m3) Natural visual density (Kg/m3) |
抗壓強度 Compression strength |
抗剪強度 Shear strength |
模量 Modulus |
承載力 Capacity |
|||
|
干 (Mpa) Dry (Mpa) |
飽和 (Mpa) Saturated (Mpa) |
f |
c （Mpa） |
彈性 (MPa) Elasticity (MPa) |
變形 （壓縮） (MPa) |
fa （KPa） |
||
|
碎石土
|
—— |
—— |
—— |
—— |
—— |
—— |
3～5 |
80～100 |
|
全風化花崗巖 Completely weathered granite |
—— |
—— |
—— |
—— |
—— |
—— |
80～200 |
180～300 |
|
強風化花崗巖 Heavily-weathered granite |
—— |
—— |
20～30 |
—— |
—— |
—— |
—— |
—— |
|
弱風化花崗巖 Weakly-weathered granite |
2．7 |
—— |
50～60 |
0．8～1.0 |
6．0～8.0 |
4．41 ×103 |
—— |
—— |
注：表中建議值根據工程經驗和類比提出，待下階段勘察工作進一步根據試驗和實際工作修改。
Notes: the following proposes originates from engineering experience and analogy, which could be rectified according to test and practice.
2012.11.28