Field Measurements and Design Optimization of Diaphragm Walls

Abstract

This paper presents field measurements of diaphragm walls. During the study, a typical measurement section was embedded with concrete strain meters to measure the forces on and in the diaphragm walls. This permitted an extensive investigation of the internal force changes in diaphragm walls. Furthermore, the stability of diaphragm walls was evaluated and optimized. The data and design optimization led to the following conclusions: variations in the stresses of diaphragm walls were observed with increases in the excavation depth of foundation pits. The strain data obtained from field measurements allowed the calculation of safety factors for the diaphragm walls, which met national code standards. Therefore, the investigated diaphragm walls were judged to be safe. The variations in the diaphragm walls' internal forces were obtained for use as references in the design and construction of similar projects in the future.

Mechanical Performance of Composite Retaining and Protection Structure for Super Large and Deep Foundation Excavations

“…At present, there are several methods for calculating the bending moment of the retaining structure. For example, the bending moment of retaining structure is calculated by measuring the stress or strain of reinforcement at the site (Chen, Yang, Zhang, Wang, & Ou, 2017). But there are few reports about the measured data of composite supporting structure for super deep excavations, to date, there has been little information about the field measured data of composite retaining structure of reinforced concrete cast-in-situ soldier pile, diaphragm wall and anchor cable.…”