Earth pressure calculation method of upper buried structure

Abstract

The invention discloses an earth pressure calculation method of a culvert, which comprises earth pressure calculation of the culvert in conditions that load-reducing measures are not implemented and the load-reducing measures are implemented. The earth pressure calculation is specifically performed in six conditions: vertical earth pressure in the condition that the load-reducing measures are not taken on the top of the culvert, vertical earth pressure in the condition that the load-reducing measures are taken on the top of the culvert, lateral earth pressure in the condition that the load-reducing measures are not taken on the top and the side of the culvert, lateral earth pressure in the condition that the load-reducing measures are taken on the top and the side of the culvert; lateral earth pressure in the condition that the load-reducing measures are taken on the top of the culvert, but not taken on the side of the culvert, and lateral earth pressure in the condition that the load-reducing measures are not taken on the top of the culvert, but taken on the side of the culvert. Aiming at the conventional culvert constructed by filling earth, the invention provides vertical and lateral earth pressure calculation formulae and load value methods in various conditions. Compared with the existing method, the results of the vertical and lateral earth pressure calculation formulae and the load value methods are closer to actual results. Additionally, aiming at the high filling culvert, the invention provides a load-reducing method and application criterion thereof. The problem of pavement deformation caused by defect of structure cracks and the culvert is effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and is suitable for various buried structures in departments such as roads, railways, water conservancy, electric power, municipal administration, energy, mines, airports, military industry, etc., such as traffic and drainage under embankments and canals Culverts (culvert pipes), flood discharge tunnels under tailings dams (reservoirs), corridors and drainage tunnels under earth-rock dams, buried underground substations, various underground passages, caverns and weapon shelters, etc. Background technique [0002] Culvert is the most widely used type of buried structure, and it is widely used in highway, railway, water conservancy, electric power, municipal, energy, mine, airport, military industry and other departments. In order to simplify the discussion, culverts are used to replace buried structures below. [0003] With the development of highways, railways, and water conserv...

AI Technical Summary

Problems solved by technology

However, the calculation methods of vertical and lateral earth pressure used by various departments at home and abroad are not uniform.

After searching, dozens of calculation methods for vertical and lateral earth pressure have been proposed at home and abroad, but the calculation results of different methods often differ greatly from each other, especially for the calculation of vertical earth pressure, which makes it difficult for designers to choose

Today, the design and earth pressure calculation of high-fill culverts basically remain at the level of decades ago. Especially in the transportation sector, there are many technical specifications and standards for the design and construction of culvert structures. Problem: On the one hand, the conservative design causes waste; on the other hand, due to the lack of understanding of the factors affecting the earth pressure of the culvert, some measures and requirements in the design and construction are not appropriate (for example, the compactness of the culvert top fill is required on the standard drawing) It is not the correct filling method of "middle pine and side solid", such as pile foundation on soft soil foundation); the requirements and determination of the bearing capacity of culvert foundations are treated as ground buildings; vertical earth pressure calculation The value is too small, and the top of the culvert bears the trapezoidal load of the embankment longitudinally, so that a series of diseases such as longitudinal and transverse cracking and large uneven settlement will occur in the culvert

When encountering culverts with weak foundations, in order to prevent various diseases or solve the insufficient bearing capacity of the foundation, the rigid foundation is designed to be very thick, some as many as 3 steps, each step is 60cm thick, and then 1-3m of sand and pebbles are replaced below Cushion layer or dry block stone grouting, and some projects even use pile foundation, resulting in greater vertical earth pressure, causing serious longitudinal cracks in the culvert and even being completely crushed

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