Determination method of risk of subsidence of karst cave foundation

Abstract

The invention relates to a karst cave type foundation stability estimation method, in particular to a measurement method of karst cave type foundation collapse risks. The measurement method mainly solves the problem that because comprehensive prediction methods for the karst cave type foundation stability are immature in the prior art and judgment models are established on the basis of different angles, the reliability of influence factors is greatly lowered. According to the specific scheme, the relation between vertical stress of overlaying soil on karst caves and limit vertical stress of the overlaying soil on the karst caves is derived and established according to the karst collapse mechanism of karst cave type foundations, stability loss risk estimation parameters for determining karst cave type foundation collapse are proposed, and the one-to-one corresponding relation between the karst cave type foundation stability loss risk estimation parameters and stability factors is established. The measurement method has the advantages of having clear stability criteria, being simple and practical and having high practicality value for effective prediction, prevention and control of karst cave type foundation collapse.

Description

technical field [0001] The invention relates to a method for evaluating the stability of a karst cave type foundation, in particular to a method for measuring the risk of collapse of a karst cave type foundation. Background technique [0002] Karst mainly refers to the dissolution of soluble rocks by groundwater and surface water and the resulting geomorphological and hydrogeological phenomena. It is commonly known as karst internationally. According to statistics, the distribution area of ​​soluble carbonate rocks in my country is 3.44 million km 2 , of which the exposed area of ​​carbonate rock is about 910,000 km 2 . Especially in the vast southwest regions such as Guizhou, Yunnan, Guangxi, Sichuan, etc., there are large areas of outcropping, and they have the characteristics of wide distribution, large thickness, old age, and various types, which provide a material basis for the development of diverse karsts. In recent years, with the rapid economic development, more ...

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Problems solved by technology

Although the above prediction methods have played an important role in the prediction and evaluation of the stability of karst foundations, through the analysis of the establishment process of the above prediction methods, it can be found that the above methods have the following shortcomings: although the space for qualitative evaluation and semi-quantitative evaluation is comparatively Macroscopic, but relatively rough, mainly applicable to the stage of feasibility study. In view of the fact that there are many factors controlling karst foundation subsidence, which are constantly changing, and the boundaries are not clear, they are all fuzzy concepts. We cannot use precise methods for fuzzy information. to deal with; the space for quantitative evaluation is relatively microscopic and specific, but the specific quantitative standards for the influencing factors in the forecasting model are not uniform and difficult

The comprehensive prediction method complements and verifies qualitative and semi-quantitative factors, makes up for the shortcomings of traditional qualitative and quantitative prediction methods, and can provide more and more reliable information. However, the development of comprehensive prediction methods for karst foundation stability is not mature enough at this stage. Moreover, the establishment of the evaluation model is based on different perspectives, so the selection of influencing factors is not uniform or single. On the one hand, the arbitrariness of this factor selection makes a certain defect more prominent, and on the other hand, the reliability of the influencing factors is greatly reduced.

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