The Slope Support Project of Dong Miao Residential Area in Ji Nan

Time:2015-10-30View:

In the ever-growing urban landscape, the challenge of stabilizing slopes and ensuring the safety of residents is of paramount importance. The success story of the Slope Support Project in the Dong Miao Residential Area, situated in the heart of Ji Nan, serves as a beacon of innovation and engineering excellence. The application of the cutting-edge Self-Drilling Anchor Bolt System has not only ensured the stability of the slopes but has also set a new standard in slope stabilization.

Engineering Challenges and Complex Conditions

Dong Miao residential area's strategic location on the northern side of Lvyou Road in Lixia District, Ji Nan, posed a unique set of challenges. Flanked by the imposing Jingzhuang Mountains on its western side, the region's geological composition demanded a comprehensive approach. The bedrock, consisting of strongly-weathered limestone, presented a formidable yet intricate base for the construction endeavors. The undulating terrain and the sprawling 37,526 square meters of building area added to the complexity of the project.

The geographical transformation due to engineering activity divided the mountain into two distinct slopes—east and west. Unfortunately, these slopes posed an imminent threat to the project's viability. Comprising a mixture of construction debris and household waste, the slopes were haphazardly formed over time by local inhabitants and distant urban influences. Consequently, the slopes suffered from severe homogeneity issues, exacerbated by the erosive forces of rainy seasons, resulting in a loose and unstable substrate.

The Innovation of Self-Drilling Anchor Bolt

Confronted with the inadequacy of traditional deep excavation methods, which couldn't fulfill the requirements for stabilizing extensive underground structures, a paradigm shift was imperative. The Self-Drilling Anchor Bolt system, hailing from international construction practices, emerged as a transformative solution in the Slope Support Project at Dong Miao Residential Area. Specifically tailored for complex geological conditions and challenging construction environments, especially in sandy cobble strata and weak soils, this technique proved to be a game-changer.
self-drilling-anchor-bolt-system

Advantages of Self-Drilling Anchor Systems

1.Efficiency and Simplicity

Traditional construction methods often involve multi-step processes, from drilling to anchoring. In stark contrast, self-drilling anchor systems are engineered for efficiency. These anchor systems combine drilling, grouting, and anchoring into a single operation, reducing time and labor requirements significantly. The simplicity of this process expedites construction timelines, a critical factor in projects where time is of the essence.

2.Cost-Effectiveness

The financial considerations of any construction project are paramount. Self-drilling anchor systems inherently lead to cost savings. The reduction in labor and equipment, coupled with the streamlined process, translates to a notable decrease in overall construction costs. This is particularly relevant in large-scale projects like the Dong Miao Residential Area, where cost efficiency is imperative.

3.Versatility in Geological Conditions

One of the standout features of self-drilling anchor systems is their adaptability to diverse geological conditions. Whether confronted with weak soils, fractured rock, or other challenging substrates, these systems excel. In the case of Dong Miao, where sandy cobble strata and weathered limestone were prevalent, the self-drilling anchor system's ability to penetrate and secure in such conditions was a game-changer.

4.Reduced Environmental Impact

The environmentally conscious approach to construction cannot be understated. Self-drilling anchor systems minimize disruption to the surrounding environment. The smaller equipment footprint and efficient drilling process translate to reduced noise, dust, and overall disturbance to the ecosystem. In Dong Miao, this approach contributed to the project's harmony with the natural landscape.

5.Enhanced Load-Bearing Capacity

Stability is the bedrock of any construction endeavor. Self-drilling anchor systems excel in this aspect by not only stabilizing slopes but also enhancing the load-bearing capacity of the terrain. By effectively redistributing forces and reinforcing weak areas, these systems contribute to the long-term structural integrity of the slope.

Designing for Stability: A Multi-Faceted Approach

The engineering design for the Slope Support Project at Dong Miao Residential Area was meticulously crafted to ensure comprehensive stabilization. A multifaceted approach was adopted, integrating cutting slope and load reduction, self-drilling anchor bolts, downhill barricades, and concrete grilles. The slope gradient was set at 1:0.8, with an inclination of 50 degrees, and an earthwork unloading of 5,500 cubic meters. The self-drilling anchor bolts, with a vertical reach of 3 meters and lengths spanning from 16 to 20 meters, were strategically positioned at 4-meter intervals on the slope surface, forming an intricate arrangement akin to a plum's structure. This arrangement, set at a 15-degree dip angle, was paramount in achieving stability. Impressively, the total length of the self-drilling anchor bolts reached a staggering 7,320 meters.

A critical aspect of the design lay in the precise positioning of the self-drilling anchor bolts—each meticulously installed at nodal points on the concrete grille. This meticulous alignment facilitated their interconnection, effectively unifying them into a cohesive whole, augmenting the overall stability of the slope.

Project	Unit	Quantity	Notes
Self-Drilling Anchor Bolt	M	7320
Concrete	M³	610
Retaining walls	M³	660
Earth excavation	M³	5500

Triumph of Innovation: Results and Impact

The successful execution of the Slope Support Project in the Dong Miao Residential Area stands as a testament to the potential of cutting-edge engineering solutions. By embracing the Self-Drilling Anchor Bolt technique, the project not only conquered the challenges posed by complex geological conditions but also substantially reduced construction costs. The innovation-driven approach eliminated the need for extensive grouting and subsequent high-pressure procedures, particularly crucial in sandy cobble strata.

Beyond its immediate impact on slope stabilization, this project has far-reaching implications. It serves as an exemplar for future construction ventures, highlighting the viability of integrating innovative techniques to surmount even the most intricate geological challenges. Moreover, it underscores the imperative of sustainable practices, as stabilization measures also contribute to curbing erosion and potential environmental hazards linked to unstable slopes.

Summary

In conclusion, the Slope Support Project at Dong Miao Residential Area showcases the profound benefits of the Self-Drilling Anchor Bolt technique in stabilizing complex terrains. Through meticulous engineering, precise design, and innovative execution, this project has not only ensured the safety of residents but has also paved the way for future advancements in slope stabilization. As urban landscapes continue to evolve, the lessons learned from this triumphant endeavor will undoubtedly resonate, guiding engineers and developers toward safer and more resilient construction practices.

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