| Lugu lake airport site is located in Ninglang county in Yunnan province YongNing village stone foshan, in a set of carbonate rocks built above in engineering geology, built in the process of detailed geotechnical problems as the most prominent, karsts the engineering geological problems, cause for concern. The strong development of karst of construction, to the airport runways foundation stability, and the future of the airport security caused a potential security influence, therefore the development of karst clear characteristics and regularity, and control factors, for further airport construction design, construction to provide the reliable basic geological basis, making the engineering design are analyzed and aimed, construction measures more accuracy and rationality.This paper, through field geological survey of the existing regional geological background, geology tectonic characteristics, can lavas distribution, karst development characteristics and rules; Aided by drilling engineering, geophysical exploration engineering project means, for a comprehensive research on the karst development area main control factors - makes a systematic geological structure, and the deep research of the karst development engineering effects produced made a preliminary analysis for engineering construction design, and put forward the Suggestions with pertinence and rationality.In determining the Yang zi quasi platform southwest edge access salt resource among animals– Li jiang platform margin, downwarped plait is broken belt, by which the saemaul faults and fault for a lenticular shapes rock chuck films, internal structure is simple, the main development construction is folding structures, joint structure. Drape shown as a gentle open entry anticline, profile morphology performance for inclined closed to open the slot, anticline of characteristic; Determining the six groups of joints of development: planar conjugate "X"cut joints, section conjugate "X" joints, horizontal joints, longitudinal joints.Engineering zone can lavas strata are widely distributed, accounts for about 90 percent of research area of karst development intensity is medium development zone. There are large quantities of surface area karst depressions, funnel, dissolve the ridge, a Clint, etc. Its development with the plane, profile of beads exhibition cloth law; with intensity, according to the relationship with the lithology, structure, strong, strong karst is divided into three development area, and the weak. Karst development mainly by topography and geomorphology, stratigraphic lithology, geological structures, hydrology geology condition, neotectonic movement, including the influence of such factors as geological structure plays leading control function.Research found that plane conjugate joints of the karst development control parts, karst development in more parts of the two groups of joints, forming the intersection of the funnel, falling nearly round hole, and "U" type grooves, etc.; Longitudinal tracking control of karst development of joint type vertical primarily, level karst development is not obvious, Anticline structure and its joint structure control the karst development law in plane, section in karst area, makes the plane, profile exhibition presented in three directions cloth direction beads-strings exhibition cloth: a group of longitudinal joints by tracking control focused on anticline turning end tracing direction parallel axis of beads exhibition cloth; The other two groups initial plane by conjugate joints in NNE, control and a string of beads that two direction across NW exhibition cloth. Fold structure control the development of the existing joint parts, and then control the intensity of the karst development, research shows that: the different distances from the drape turn karst development intensity differences, in determining the midway through the runway with runway coincidence anticline turn formed strong dissolution segments, far away from the kernel part of drape area karst development strength tends to be reduced.Research found that caused the karst development project engineering effects, such as: First, karst development, make strong bedrock surface undulating, easy to cause foundation uneven settlement; Second, in the karst development area, strong karst depressions, funnel dotted, in engineering in local areas have happened under the action of the subsidence likely; Third, the low-lying areas in central area, groundwater level burial is shallow and silty sand and powder soil often enough water in vibration condition, it is often easier plastic liquefaction, mechanics of low intensity, to meet the runway landing surface strength requirement. In view of the above Suggestions: First, engineering effects, find out large depressions, further the thickness of fillings hopper, property, state whether there were any big and the karst pipe; Second, further define the groundwater distribution and the influence of the engineering stability of underground water, determine the spatial distribution of abundant water; Third, do the airport project, drainage and anti-seepage work to stop further deterioration of karst. |
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