陕北湿陷性黄土大型风电机组地基处理技术研究
发布时间：2018-10-12 06:31
【摘要】：随着世界范围内环境污染的不断加剧和不可再生能源的日益枯竭,风力发电作为一种绿色能源已受到广泛关注。我国陕西北部定边地区风能资源丰富,风电场建设工程日益增多。风电基础的建设是风电场建设的最关键环节之一,陕北地区黄土分布范围广、厚度大、湿陷等级高,给风电基础工程的建设带来一定的困难。因此,对该地区风电机组地基处理技术开展研究,具有重要的意义和指导价值。本文以陕北沈口子风电场100MW工程为背景,通过理论分析、数值模拟和现场检测等方法,对陕北湿陷性黄土大型风电机组地基处理技术进行研究,主要工作和结论如下:首先,对风电机组基础的受力特性及关键技术进行了系统分析。风电机组在运行过程中,基础的受力特性与一般基础有很大不同,将承受竖向荷载、倾覆弯矩、水平荷载和扭矩的共同作用。在复杂荷载作用下,如何满足基础稳定性要求是地基处理的关键技术。其次,对陕北湿陷性黄土特性开展试验研究,得到了场地地基土的物理力学参数,并对湿陷性地质条件进行了评价分析,在此基础上提出采用扩底混凝土灌注桩为主要结构形式的地基处理方案并进行理论验算。同时,利用ABAQUS有限元模拟软件,分析了不同荷载、不同桩长、不同桩径、摩擦系数变化对桩沉降量的影响,得出桩身轴力、应力应变随荷载的分布特性,结果表明:施工采用的扩底混凝土灌注桩的各项参数均满足基础承载要求。最后,通过对地基处理方案中的相同桩径,不同桩长的三种类型的单桩静载、低应变现场试验检测,分析了不同荷载对桩顶沉降量的影响,得出桩的竖向极限承载力标准值,其检测和计算结果均小于控制指标,进一步验证了扩底混凝土灌注桩参数选取是科学合理的,也为今后本地区类似风电机组的基础工程建设提供科学依据。
[Abstract]:With the worsening of environmental pollution and the depletion of non-renewable energy in the world, wind power generation as a green energy has been widely concerned. Dingbian area in northern Shaanxi Province is rich in wind energy resources and wind farm construction projects are increasing day by day. The construction of wind power foundation is one of the most important links in wind farm construction. The loess in northern Shaanxi has a wide distribution range, a large thickness and a high grade of collapsibility, which brings some difficulties to the construction of wind power foundation engineering. Therefore, it is of great significance and guiding value to study the foundation treatment technology of wind turbine units in this area. In this paper, based on the 100MW project of Shenkouzi wind farm in northern Shaanxi, the foundation treatment technology of collapsible loess large scale wind turbine in northern Shaanxi is studied by theoretical analysis, numerical simulation and field detection. The main work and conclusions are as follows: first, The mechanical characteristics and key technologies of wind turbine foundation are systematically analyzed. During the operation of wind turbine, the bearing characteristics of the foundation are very different from those of the general foundation, which will bear the joint action of vertical load, overturning moment, horizontal load and torque. How to meet the requirements of foundation stability under complex loads is the key technology of foundation treatment. Secondly, the properties of collapsible loess in northern Shaanxi are studied, and the physical and mechanical parameters of ground soil are obtained, and the geological conditions of collapsibility are evaluated and analyzed. On the basis of this, a foundation treatment scheme is put forward in which the reinforced concrete cast-in-place pile is used as the main structural form and the theoretical checking calculation is carried out. At the same time, the influence of different load, pile length, pile diameter and friction coefficient on pile settlement is analyzed by using ABAQUS finite element simulation software, and the distribution characteristics of axial force, stress and strain of pile body with load are obtained. The results show that the parameters of the reinforced concrete cast-in-place pile meet the requirements of foundation bearing. Finally, by testing three types of single pile with the same diameter and different pile lengths in the foundation treatment scheme, the influence of different loads on the settlement of the pile top is analyzed, and the standard value of the vertical ultimate bearing capacity of the pile is obtained. The test and calculation results are less than the control index, which further verifies that the selection of the parameters of the reamed concrete cast-in-place pile is scientific and reasonable, and also provides a scientific basis for the future construction of similar wind turbine units in this area.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM614
本文编号：2265128
[Abstract]:With the worsening of environmental pollution and the depletion of non-renewable energy in the world, wind power generation as a green energy has been widely concerned. Dingbian area in northern Shaanxi Province is rich in wind energy resources and wind farm construction projects are increasing day by day. The construction of wind power foundation is one of the most important links in wind farm construction. The loess in northern Shaanxi has a wide distribution range, a large thickness and a high grade of collapsibility, which brings some difficulties to the construction of wind power foundation engineering. Therefore, it is of great significance and guiding value to study the foundation treatment technology of wind turbine units in this area. In this paper, based on the 100MW project of Shenkouzi wind farm in northern Shaanxi, the foundation treatment technology of collapsible loess large scale wind turbine in northern Shaanxi is studied by theoretical analysis, numerical simulation and field detection. The main work and conclusions are as follows: first, The mechanical characteristics and key technologies of wind turbine foundation are systematically analyzed. During the operation of wind turbine, the bearing characteristics of the foundation are very different from those of the general foundation, which will bear the joint action of vertical load, overturning moment, horizontal load and torque. How to meet the requirements of foundation stability under complex loads is the key technology of foundation treatment. Secondly, the properties of collapsible loess in northern Shaanxi are studied, and the physical and mechanical parameters of ground soil are obtained, and the geological conditions of collapsibility are evaluated and analyzed. On the basis of this, a foundation treatment scheme is put forward in which the reinforced concrete cast-in-place pile is used as the main structural form and the theoretical checking calculation is carried out. At the same time, the influence of different load, pile length, pile diameter and friction coefficient on pile settlement is analyzed by using ABAQUS finite element simulation software, and the distribution characteristics of axial force, stress and strain of pile body with load are obtained. The results show that the parameters of the reinforced concrete cast-in-place pile meet the requirements of foundation bearing. Finally, by testing three types of single pile with the same diameter and different pile lengths in the foundation treatment scheme, the influence of different loads on the settlement of the pile top is analyzed, and the standard value of the vertical ultimate bearing capacity of the pile is obtained. The test and calculation results are less than the control index, which further verifies that the selection of the parameters of the reamed concrete cast-in-place pile is scientific and reasonable, and also provides a scientific basis for the future construction of similar wind turbine units in this area.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM614
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