Method for reinforcing debris flow blocking dam foundation based on micro composite piles

Abstract

The invention discloses a method for reinforcing a debris flow blocking dam foundation based on micro composite piles. The method includes the steps that according to the natural foundation bearing capacity of a dam foundation and the proposed dam body foundation stress, and in combination with the terrain condition of the dam site, a pile group foundation is formed by the micro steel pipe piles, and a composite foundation is formed through matching of the pile group foundation, internal steel bar cores and external expanding pressure grouting; and the steel pipes, concrete in the pipes and the steel bar cores act jointly, pressed rod pieces fixed to the two ends bear the stress and deformation analysis is worked out according to a reduced fracture method of the elastic stage. According to the method, the characteristics of high pressure strength and high elasticity modulus of the steel materials such as the steel pipe piles and the steel bar cores are fully utilized, and the bearing capacity of the debris dam foundation can be improved by 10-12 times. The anti-scouring capacity of a soil layer of the dam foundation is greatly improved, and the problems that the bearing capacity of a narrow and steep type debris flow trench foundation is not enough, and degradation below a dam affects the safety of a dam body are solved. The needed occupied area is small, the needed excavation and disturbance workload is low, construction is quick and convenient, and the method has the remarkable advantage in being applied to debris flow trenches with severe terrain conditions in highly seismic regions.

Description

technical field [0001] The invention belongs to the technical field of debris flow prevention and control, and in particular relates to a method for reinforcing the base of a debris flow retaining dam based on composite micro piles. Background technique [0002] Debris flow disasters are one of the main types of geological disasters in my country. Especially after the "5.12" Wenchuan Earthquake, the debris flow activities in the western mountainous areas have increased significantly. Debris flow ditches in strong earthquake areas often present the characteristics of narrow valleys, steep vertical slopes, high bank slopes, and loose rock and soil. The construction environment of this type of debris flow ditch prevention and control project is complex and harsh, with high safety risks. Many techniques and technologies that have been widely used in the past have no conditions for implementation in this type of project. For example, limited by the scope and depth of excavation,...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for strengthening the foundation of debris flow retaining dams based on composite micro piles, aiming at solving the problem of weak ground bearing capacity and harsh topographical conditions of debris flow ditches that often occur in current strong earthquake areas, resulting in difficulties in the foundation treatment of retaining works in ditches. question

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