风机对地基强度和抗倾覆的要求-中英对照
The foundation strength and anti-overturning requirement should be satisfied:
（1）全风化带岩石：由于岩性软弱强度极低，分布厚度较大时如做风机的天然地基，必须验算沉降变形等指标。
（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）强风化带岩石：上部较破碎，中下部岩体渐趋完整，强度渐提高，经采取工程处理措施后，可考虑采用天然地基，但须满足强度和抗拔的要求。
（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）弱风化岩石：坚硬度较高，岩体完整性也较好，可采用天然地基若有断层或裂隙密集带分布可采取工程处理措施。但须作强度和抗拔验算。
（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）若个别全风化层较厚，开挖有较大困难可适当移位、必要时也可考虑采用桩基础，并以弱风化基岩或强风化基岩上部岩体作为桩基持力层。
（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）在山梁较窄地段，而外侧山坡为基岩陡坡，且长大裂隙发育若选择作风机位置时尚须考虑边坡稳定问题。
（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）场址区局部地带可能有断层和裂隙密集带，下阶段详勘时应进一步论证其对风电机组基础的影响。
（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冻土层情况
3.2.4 Permafrost condition
根据实地调查，本地区冻土层厚度约为1.40m。
According to field investigation, the permafrost thickness in this area is about 1.40 m.
3.3结论及建议
3.3 Conclusions and Recommendations
（1）风电场址区域地震动峰值加速度为0.05g，对应的地震基本裂度为Ⅵ度。区域构造稳定性较好。
（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）场址范围无崩塌、滑坡分布，无长大缓倾的结构面发育，场址山体的整体稳定性较好，宜选为风电场址。
（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）由于组成地基的基岩的风化厚度各地均有差异，风化分带结构也不相同，因而地基处理措施应分别不同情况对待。
（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 物理力学性质指标建议值表
Table 3-2 Index Suggestion on Physical and Mechanical Property
|
项 目Item 岩 石 类 别 Type |
天然 视密度 (Kg/m3) Natural visual density (Kg/m3) |
抗压强度 Compression strength |
抗剪强度 Shear strength |
模量 Modulus |
承载力 Capacity |
|||
|
干 (Mpa) Dry (Mpa) |
饱和 (Mpa) Saturated (Mpa) |
f |
c （Mpa） |
弹性 (MPa) Elasticity (MPa) |
变形 （压缩） (MPa) |
fa （KPa） |
||
|
碎石土 |
—— |
—— |
—— |
—— |
—— |
—— |
3～5 |
80～100 |
|
全风化花岗岩 Completely weathered granite |
—— |
—— |
—— |
—— |
—— |
—— |
80～200 |
180～300 |
|
强风化花岗岩 Heavily-weathered granite |
—— |
—— |
20～30 |
—— |
—— |
—— |
—— |
—— |
|
弱风化花岗岩 Weakly-weathered granite |
2．7 |
—— |
50～60 |
0．8～1.0 |
6．0～8.0 |
4．41 ×103 |
—— |
—— |
注：表中建议值根据工程经验和类比提出，待下阶段勘察工作进一步根据试验和实际工作修改。
Notes: the following proposes originates from engineering experience and analogy, which could be rectified according to test and practice.
2012.11.28