A classification method of Lanzhou red sandstone and a selection method of corresponding engineering measures

Abstract

The invention relates to a classification method of Lanzhou red sandstone and a selection method of corresponding engineering measures. It is assumed that all dry density measured values of a single drill hole in the planned construction site are xi, dry density representative values of all the drill holes in the planned construction site are obtained after a series of operations, and red sandstone types are divided into three types I, II and III according to corresponding arithmetic mean values and variable coefficient cv values. The classification method based on the red sandstone diagenesisand with the dry density as the classification index is creatively provided, the engineering characteristics of red sandstone can be better distinguished, and the scientific rationality of red sandstone classification is improved. According to the method, the water permeability of the red sandstone and the field characteristics of the red sandstone of different types are redefined, different supporting systems and underground water control measure suggestions are provided for the red sandstone of different types, and therefore the key technical problems of water gushing and sand gushing of the Lanzhou red sandstone stratum deep foundation pit are solved, rapid excavation is achieved, and safety, reliability, economy and reasonableness are achieved.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a classification method of Lanzhou red sandstone and a selection method of corresponding engineering measures. Background technique [0002] Red sandstone is a common special rock formation in Lanzhou area. It is widely distributed in the vast area from the east of Xigu to the west of Chengguan Yantan in Lanzhou area. It has the characteristics of poor diagenesis, easy weathering when exposed, and easy disintegration and softening when exposed to water. With the rapid development of urban rail transit and high-rise buildings, there are more and more deep foundation pit projects. During the excavation process of foundation pits, the red sandstone below the water level is prone to disintegration, water gushing sand, and soaking foundation pits. It leads to slow excavation, seriously affects the construction period, and increases potential safety hazards. The main ...

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a more scientific and reasonable classification method of Lanzhou red sandstone and the selection method of corresponding engineering measures, so as to solve the problem of water gushing, sand gushing and soaking foundation pit during the excavation process of red sandstone formation. pit problems, ensure the safety of foundation pits, speed up construction progress and reduce project costs

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