详情描述

Proposed modular intelligent heating equipment production and big data energy management center project, located in the Economic and Technological Development Zone of Dezhou City, Shandong Province. The project covers an area of 150 acres, requiring approximately 110 acres for compaction construction. The original terrain features a deep pit of up to -6 meters, which has been backfilled but remains uneven. The surface is covered with tree roots and cultivated soil. The design employs compaction methods for foundation treatment to meet the base design requirements.

Preparation Phase:
(1) Access Road: To ensure the smooth progress of the leveling project for reliable sites, construct access roads before the leveling process is completed. Also, ensure proper safety maintenance. The width of the access road should not be less than 5 meters to facilitate the entry and exit of compaction equipment.
(2) Organize the on-site assembly of equipment, place the bulldozers and compaction machines in position.
(3) Site leveling: Use bulldozers and excavators to remove surface vegetation, weeds, and other domestic waste such as backfill soil from the site, to roughly level the existing site to meet the requirements for machinery working surface.
(4) To meet the green construction requirements, the site's land has been covered with a green netting, adhering to the principle of covering and leveling as the netting is removed.
The principle of "as needed, not on a large scale" is applied to land leveling, which is done in sections. The leveling and compaction work is carried out in a continuous flow, with each section being compacted and handed over upon completion.

Compaction by dropping heavy hammers, which weigh from tens to hundreds of tons, from heights ranging from a few to several dozen meters, to dynamically compact the soil, reducing its compressibility and improving its workability. This method of soil reinforcement is primarily suitable for coarse-grained soils with particle sizes greater than 0.05mm, such as sandy soil, gravelly soil, loess soil, fly ash, mixed fill soil, backfill soil, low-saturation silt, clay, slightly expansive soil, and collapsible loess. Compaction by dropping heavy hammers refers to a method of rapidly consolidating the foundation by using heavy hammers dropped from a height to improve the bearing capacity of soft foundations.
Also known as the dynamic consolidation method, it employs lifting equipment to elevate a 10-40 ton weight to a height of 10-40 meters, allowing it to fall freely, compacting soil layers with the force of the impact and shock waves. The ramming method is primarily used for sandy soil, unsaturated clayey soil, and fill land foundations. For unsaturated clayey soil foundations, continuous ramming or intermittent ramming in stages is generally adopted; the number of ramming cycles and the depth of successful compaction are determined through on-site testing according to engineering requirements. Existing experience indicates that under a ramming energy of 300-800 ton-meters, a successful compaction depth of 6-10 meters can typically be achieved.
Quantify iron oxide and mica sheets, locally distributed in the area, with an average thickness of 1.77 meters. Original soil foundation bearing capacity value fak & ge; 120 kPa.
Groundwater impact on engineering:
The groundwater in this area is of the Quaternary aquifer type, with a measured depth of 1.62-3.52 meters during the survey period. The groundwater recharge is primarily from atmospheric precipitation and upstream runoff, with an annual fluctuation of 1.00-2.00 meters. The historical high water level corresponds to an elevation of 19.00 meters. The design elevation for the compaction work face in the northern part of the site is 20.6 meters, while in the southern high-fill area, it is 21.5 meters. The distance from the exploration groundwater level is less than 3 meters. Due to the shallow groundwater level, the design of the compaction construction must consider the impact of groundwater. Under heavy compaction锤 strikes, the pore water pressure in the foundation will rapidly increase, causing local groundwater levels to rise quickly and leading to the "rubber soil" phenomenon. Under limited construction conditions, and considering the on-site实际情况, a synchronized construction plan should be adopted to reliably control the groundwater level within a reasonable range during compaction. This is necessary to achieve a favorable compaction result for the foundation. Otherwise, the foundation may "leak" and the rising groundwater level will rapidly increase the pore water pressure, causing the foundation to heave, which can lead to consequences that are difficult to compensate for.
Site Preparation Process Before Compaction Test
All original topsoil and tree roots, along with other living and construction waste, have been removed by bulldozer to a depth of no less than 10 cm and have been transported out of the site.
2. Reliable site leveling with flatness, using GPS and other surveying equipment to lay out the boundary lines and elevation controls (based on design requirements for positive and negative elevation, and aligning the first foundation's bottom with the elevation, the total settlement amount after compaction is calculated to determine the site leveling elevation), and using bulldozers for reliable leveling and smooth compaction operations.
3. The trial compaction area is located in the southern part of the laying-out exit zone. The area is approximately 15 meters long and 60 meters wide, with the land within it leveled and the compaction points marked with red bags.