由于经济发展规模的增加，人口的迅速增长，在岩溶地区开展建设工程项目，修

Due to the increased scale of economic development, rapid population growth, carry out construction projects in karst areas, construction of houses, railways, bridges, high-rise buildings, etc. more and more people's attention. Built in the karst region pile foundation construction projects mainly carried pile foundation construction in karst areas, we must first make full use of favorable conditions, by expanding the investigation of karst geology, understand the characteristics of karst features, control the distribution of morphological characteristics, in select the appropriate reference pile foundation construction technology is based on the construction project in karst regions. Pile foundation construction technology conducted in karst area connectivity karst, groundwater level, the nature of the filler within the cave space, the degree of development and construction environment and construction machines karst hole transport so as to pile foundation with to the influence and played a decisive role. Meanwhile, the foundation pile construction method of Karst Area suitable artificial bored pile, pile holes drilled into the pile into the hole, and impact, and quality evaluation pile foundation construction techniques include the integrity and strength of the concrete foundation pile in two piles aspects. Also in the pile foundation construction process in karst regions hole collapse Central Standing Committee, skew, leakage oar stuck pipe, buried drilling, drilling out the problem, we must make the prevention and control measures in the construction process to ensure the construction of pile foundation in karst regions technical quality.

Due to the increase in the scale of economic development and the rapid growth of the population, construction projects in karst areas, construction of houses, railways, bridges, high-rise buildings and so on have been more and more attention. Construction and construction projects in karst areas are based on piles, and pile-based construction in karst areas should first make full use of favorable conditions, and understand the characteristics of karst geomorphological functions by surveying karst geology, and grasp the distribution of their morphological features. On this basis, it provides reference for selecting the appropriate pile-based construction technology for the construction project in the karst area. The pile-based construction technology, the connectivity of karst, the height of the water table, the nature of the filling in the cave gap, the development of karst and the construction environment and the transportation of construction machinery have all had an impact on the hole-forming of the pile foundation and played a decisive role. At the same time, the suitable construction methods of pile foundation in karst area include artificial drilling perforation pile, drilling into hole perfusion pile and impact-forming perforation pile, and the quality evaluation of pile foundation construction technology includes the integrity of the base pile and the concrete strength of the pile body. In addition, in the karst area pile foundation construction process will often appear collapse holes, skew, leakage oars, card drilling, buried drilling, drilling and other problems, so in the construction process must do a good job of preventive control measures to ensure the construction technology quality of the pile foundation in karst area.

Because of the increase of economic development scale and the rapid growth of population, people are paying more and more attention to the construction of houses, railways, bridges and high-rise buildings in karst areas. Pile foundation is the main construction project in karst area. To carry out pile foundation construction in karst area, first of all, we should make full use of the favorable conditions, through the investigation of karst geology, understand the characteristics of karst geomorphic function, master the distribution of its morphological characteristics, and on this basis, provide reference for the selection of appropriate pile foundation construction technology for construction projects in karst area. The construction technology of pile foundation, the connectivity of karst, the height of groundwater level, the nature of filling materials in the gap between caves, the development degree of karst, the construction environment and the transportation of construction machinery in karst area all affect the formation of pile foundation and play a decisive role. At the same time, the suitable construction methods of pile foundation in karst area include manual digging, drilling and percussion, and the quality evaluation of pile foundation construction technology includes the integrity of foundation pile and the concrete strength of pile body. In addition, in the process of pile foundation construction in karst areas, there are often problems such as hole collapse, deflection, leakage of propeller, sticking, drilling and falling out, etc. Therefore, prevention and control measures must be taken in the construction process to ensure the construction technology quality of pile foundation in karst areas.<br>