Construction method for digging deep foundation pit in large-thickness highly weathered sandstone stratum in combined supporting mode: Fid-Bau Portal

Construction method for digging deep foundation pit in large-thickness highly weathered sandstone stratum in combined supporting mode

ZHOU YAN / DAI HONG / RUAN LILONG

Abstract

The invention provides a construction method for digging a deep foundation pit in a large-thickness highly weathered sandstone stratum in a combined supporting mode, and relates to the technical field of complex geology deep foundation pit supporting construction in constructional engineering. According to the construction method, highly weathered sandstone stratum supporting is divided into two parts, the upper part of the sandstone stratum adopts a hollow anchor bolt shotcrete and rock bolt supporting mode, and a high-pressure jet grouting pile supporting mode is adopted 3 meters above a base. By means of the construction method, the problems in excavation, water sealing-up and supporting under the complex geology conditions that the highly weathered sandstone is not exposed evenly and large in thickness, and fissure water is not distributed evenly are solved effectively, the phenomena of fissure water and subsurface erosion of the large-thickness highly weathered sandstone stratum are effectively prevented, and softening and quicksand of the base are prevented.

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