Abstract
Due to the high bearing capacity and better controllability of bladder parameters, the multibladder-type inflatable anchor shows a great application prospect in the engineering construction in soft soil areas. In this study, based on a soft soil foundation pit project in Guangzhou Province, China, the multibladder-type inflatable anchor was applied to the engineering practice for the first time, and the working characteristics of the multibladder-type inflatable anchor were analyzed and discussed through field experiments. Primarily, the optimization design and experimental facility of the multibladder-type inflatable anchor were introduced in detail to realize the refinement and perfection of the anchorage technological process. Besides, the influence degrees of the bladder number, diameter, thickness, space, and length on the bearing characteristics and deformation control of the anchor were studied by using the control variable method, as well as the influencing mechanisms. Subsequently, the advantages of the multibladder-type inflatable anchor were presented by comparing its anchoring efficacy with that of the traditional grouting anchor. Ultimately, the analysis results were used to verify the reliability of the multibladder-type inflatable anchor and provide the experimental basis for its popularization and application.
Highlights
Anchorage technology can enhance the strength and selfstability of rock and soil mass, so as to achieve the construction purpose and safety requirements [1,2,3,4]
The modernization progress is advancing faster and faster, and underground engineering constructions continually emerge [13], accompanied by complex terrain, poor geological conditions, and changeable surrounding environment, which brings complex challenges and requirements to the anchorage technology of geotechnical engineering and inspires scholars and experts to carry out deep investigations on the anchorage form, anchorage mechanism, anchorage structures, construction technology, and experimental methods
In the 1980s, the United States, South Africa, Australia, the Advances in Civil Engineering former Soviet Union, and other countries have developed the support structure of the flexible anchor, active prestressed bolt, and high-strength anchor cable in accordance with the unfavorable geological conditions such as deep high stress and weak surrounding rock encountered in mining engineering [18]
Summary
Anchorage technology can enhance the strength and selfstability of rock and soil mass, so as to achieve the construction purpose and safety requirements [1,2,3,4]. Erefore, supported by a soft soil foundation pit project in Guangzhou Province, China, a series of field pullout experiments were carried out on the independently developed and designed multibladder-type inflatable anchor to test its bearing capacity and deformation control in this study, and the results were compared with those of the traditional grouting anchor. Since it is difficult to control the expansion shape of the bladder in soil mass during current research studies and it is still unknown that how much air pressure is sufficient to meet the design requirements of bladder volume, the water injection method was applied to the multibladder-type inflatable anchor, instead of air inflation. E task of the experiments is to investigate the influence of bladder parameters, length, thickness, diameter, number, and space, on the bearing characteristics and deformation control capability of the multibladder-type inflatable anchor (see Figure 4) and obtain the optimal collocation of bladder parameters. (5) Anchor recycle: after the experiment completion, open the control valve to drain water, use the excavator to pull out the anchor, and check its integrity, including anchor fracture degree, bladder, and seal damage degree
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