Power equipment often requires high stability of foundation and is sensitive to settlement. If the foundation bearing capacity of substation is poor, in order to ensure the safe operation of equipment, the foundation must be treated. Pipe pile has good effect on heavy equipment, high stability and fast construction speed, but the project cost is relatively expensive; dynamic compaction method is more economical for large area foundation treatment, and can meet the requirements of most small equipment.

当建筑地基的承载力不足或压缩性过大，不能满足设计要求时，可以针对不同地基，进行处理。以增加地基土的强度、刚度和稳定性；减少地基变形，提高地基承载力。进行地基处理必须明确处理的目的，选择合适的地基处理方法，并作好处理前的准备工作和处理后的勘察鉴定工作。

When the bearing capacity of building foundation is insufficient or the compressibility is too large to meet the design requirements, different foundations can be treated. In order to increase the strength, stiffness and stability of the foundation soil, reduce the deformation of the foundation and improve the bearing capacity of the foundation. In order to carry out foundation treatment, we must first clarify the purpose of treatment, select appropriate foundation treatment methods, and make preparations before treatment and survey and appraisal after treatment.

一、地基处理的目的及前后工作

1、 The purpose of foundation treatment and the work before and after

（一）、地基处理的目的

（1） The purpose of foundation treatment

针对性质不同的地基上，如软土、湿陷性黄土、膨胀土、岩溶、滑移、液化等特殊地质情况，采用不同的地基处理方法，以达到地基处理的目的。如：提高地基承载力；提高地基抗剪强度、防止地基产生过大的剪切变形，避免大面积土体滑动；改善土的压缩性、减少地基变形；改善土的动力特性、减轻或地震效应、防止砂土液化；消陷性黄土的湿陷性；防止膨胀土遇水膨胀，干旱收缩的性能；解决岩溶地区的溶沟、溶洞等危害。

According to the special geological conditions such as soft soil, collapsible loess, expansive soil, karst, sliding and liquefaction, different foundation treatment methods are adopted to achieve the purpose of foundation treatment. For example: to improve the bearing capacity of the foundation; to improve the shear strength of the foundation; to prevent the foundation from producing excessive shear deformation and to avoid large-area soil sliding; to improve the compressibility of soil and reduce the deformation of foundation; to improve the dynamic characteristics of soil, to reduce or eliminate the seismic effect, to prevent sand liquefaction; to eliminate the collapsibility of collapsible loess; to prevent the expansive soil from swelling and shrinking due to drought; to solve the problem The hazard of karst ditch and cave in karst area.

（二）、地基处理前后工作

（2） Before and after foundation treatment

（1）处理前的准备工作：收集和研究分析已有的岩土勘察报告；调查当地地基基础现状和地基常用的有效方法；对地下水位要进行深入调查了解；注意地基处理对邻近建筑、地下设施、地下管道等的影响。

(1) Preparation before treatment: collect, study and analyze the existing geotechnical investigation reports; investigate the current situation of local foundation and effective methods commonly used for foundation; conduct in-depth investigation and understanding of groundwater level; pay attention to the impact of foundation treatment on adjacent buildings, underground facilities and underground pipelines.

（2）处理后的勘察鉴定工作：所有经过处理的的地基，必须进行岩土工程勘察、重新提供设计所需的技术参数；根据新的岩土工程勘察成果，鉴定地基处理的目的是否达到；然后在处理后的地基上进行地基基础设计。

(2) Investigation and appraisal after treatment: for all treated foundations, geotechnical investigation must be carried out and technical parameters required for design shall be re provided; according to the new geotechnical engineering survey results, whether the purpose of foundation treatment has been achieved shall be identified; and then the foundation design shall be carried out on the treated foundation.