进入二十世纪以来，城市建设规模的不断发展，地面空间越来越不能满足人们的

Since the beginning of the twentieth century, the construction scale of the city continues to develop, more and more floor space can not meet people's needs, people began to look to the ground, looking for urban development space, namely the development and utilization of urban underground space. The underground space development and construction of the first is the excavation. With the vigorous development of underground space, whether from the excavation depth and breadth have been considerable development, a variety of complex geological and hydrological conditions of the environment on the construction technology requirements are also increasing, how to solve the pit support issues are the main problems faced by the construction pit. This paper systematically describes the TRD construction method in foundation pit support.

Since the beginning of the 20th century, the scale of urban construction has been continuously developed, the ground space is becoming more and more unable to meet people's needs, people began to turn to the underground, looking for urban development space, that is, the development and utilization of urban underground space. And the development and construction of underground space is the first to be the foundation pit project. With the vigorous development of underground space, the foundation pit project has been developed by leaps and bounds from depth or breadth, and the construction technology requirements of various complex geological conditions and hydrological environment are getting higher and higher, so how to solve the problem of foundation pit support reasonably is the main problem facing the construction of the foundation pit. This paper explains the application of TRD work method in base pit support.

Since the 20th century, with the continuous development of urban construction scale, the ground space is more and more unable to meet the needs of people. People began to turn their eyes to the underground and seek the space for urban development, that is, the development and utilization of urban underground space. And the development and construction of underground space is the foundation pit project. With the rapid development of underground space, foundation pit engineering has made great progress both in depth and breadth. Various complex geological conditions and hydrological environment require more and more construction technology. How to reasonably solve the problem of foundation pit support is the main problem facing the current foundation pit construction. This paper systematically expounds the application of TRD in foundation pit support.<br>