【Daily Discussion】Utilities – Civil Engineering – 20200908

(1) Effect of compaction work. The gravitational density of the compacted fill is not directly proportional to the work exerted by the compaction machinery on the fill. When the moisture content of the soil remains constant and compression begins, the gravitational density of the soil increases sharply. As it approaches the maximum specific weight of the soil, although the amount of work done in compression increases significantly, the gravitational density of the soil hardly changes. In actual construction, heavy rolling is used from the very beginning to loosen the soil, but the compaction effect is poor, and the soil layer has unevenities. If light rolling is used first and then a heavy roller, the compaction result will be better. (2) Influence of soil moisture content. Under the same compaction conditions, due to the frictional resistance between soil particles, drier soil is difficult to compact. When the soil has an appropriate moisture content, water acts as a lubricant between the soil particles, reducing the friction between them and thus facilitating compaction. Therefore, at the optimal moisture content of the soil, the same compaction effort can yield the highest dry unit weight. (3) Influence of soil covering thickness and number of compaction passes. Under the action of compaction work, the stress in soil gradually decreases as depth increases. The thickness of the soil layer should be less than the working depth of the compaction machinery.

(1) Effect of compaction work. The gravitational density of the compacted fill is not directly proportional to the work exerted by the compaction machinery on the fill. When the moisture content of the soil remains constant and compression begins, the gravitational density of the soil increases sharply. As it approaches the maximum specific weight of the soil, although the amount of work done in compression increases significantly, the gravitational density of the soil hardly changes. In actual construction, heavy rolling is used from the very beginning to loosen the soil, but the compaction effect is poor, and the soil layer has unevenities. If light rolling is used first and then a heavy roller, the compaction result will be better. (2) Influence of soil moisture content. Under the same compaction conditions, due to the frictional resistance between soil particles, drier soil is difficult to compact. When the soil has an appropriate moisture content, water acts as a lubricant between the soil particles, reducing the friction between them and thus facilitating compaction. Therefore, at the optimal moisture content of the soil, the same compaction effort can yield the highest dry unit weight. (3) Influence of soil covering thickness and number of compaction passes. Under the action of compaction work, the stress in soil gradually decreases as depth increases. The thickness of the soil layer should be less than the working depth of the compaction machinery.

(1) Effect of compaction work. The gravitational density of the compacted fill is not directly proportional to the work exerted by the compaction machinery on the fill. When the moisture content of the soil remains constant and compression begins, the gravitational density of the soil increases sharply. As it approaches the maximum specific weight of the soil, although the amount of work done in compression increases significantly, the gravitational density of the soil hardly changes. In actual construction, heavy rolling is used from the very beginning to loosen the soil, but the compaction effect is poor, and the soil layer has unevenities. If light rolling is used first and then a heavy roller, the compaction result will be better. (2) Influence of soil moisture content. Under the same compaction conditions, due to the frictional resistance between soil particles, drier soil is difficult to compact. When the soil has an appropriate moisture content, water acts as a lubricant between the soil particles, reducing the friction between them and thus facilitating compaction. Therefore, at the optimal moisture content of the soil, the same compaction effort can yield the highest dry unit weight. (3) Influence of soil covering thickness and number of compaction passes. Under the action of compaction work, the stress in soil gradually decreases as depth increases. The thickness of the soil layer should be less than the working depth of the compaction machinery.

(1) Effect of compaction work. The gravitational density of the compacted fill is not directly proportional to the work exerted by the compaction machinery on the fill. When the moisture content of the soil remains constant and compression begins, the gravitational density of the soil increases sharply. As it approaches the maximum specific weight of the soil, although the amount of work done in compression increases significantly, the gravitational density of the soil hardly changes. In actual construction, heavy rolling is used from the very beginning to loosen the soil, but the compaction effect is poor, and the soil layer has unevenities. If light rolling is used first and then a heavy roller, the compaction result will be better. (2) Influence of soil moisture content. Under the same compaction conditions, due to the frictional resistance between soil particles, drier soil is difficult to compact. When the soil has an appropriate moisture content, water acts as a lubricant between the soil particles, reducing the friction between them and thus facilitating compaction. Therefore, at the optimal moisture content of the soil, the same compaction effort can yield the highest dry unit weight. (3) Influence of soil covering thickness and number of compaction passes. Under the action of compaction work, the stress in soil gradually decreases as depth increases. The thickness of the soil layer should be less than the working depth of the compaction machinery.

(1) Effect of compaction work. The gravitational density of the compacted fill is not directly proportional to the work exerted by the compaction machinery on the fill. When the moisture content of the soil remains constant and compression begins, the gravitational density of the soil increases sharply. As it approaches the maximum specific weight of the soil, although the amount of work done in compression increases significantly, the gravitational density of the soil hardly changes. In actual construction, heavy rolling is used from the very beginning to loosen the soil, but the compaction effect is poor, and the soil layer has unevenities. If light rolling is used first and then a heavy roller, the compaction result will be better. (2) Influence of soil moisture content. Under the same compaction conditions, due to the frictional resistance between soil particles, drier soil is difficult to compact. When the soil has an appropriate moisture content, water acts as a lubricant between the soil particles, reducing the friction between them and thus facilitating compaction. Therefore, at the optimal moisture content of the soil, the same compaction effort can yield the highest dry unit weight. (3) Influence of soil covering thickness and number of compaction passes. Under the action of compaction work, the stress in soil gradually decreases as depth increases. The thickness of the soil layer should be less than the depth of action of the compaction machinery

Compaction work, soil moisture content, and thickness of each layer of soil applied

(1) Effect of compaction work. The gravitational density of the compacted fill is not directly proportional to the work exerted by the compaction machinery on the fill. When the moisture content of the soil remains constant and compression begins, the gravitational density of the soil increases sharply. As it approaches the maximum specific weight of the soil, although the amount of work done in compression increases significantly, the gravitational density of the soil hardly changes. In actual construction, heavy rolling is used from the very beginning to loosen the soil, but the compaction effect is poor, and the soil layer has unevenities. If light rolling is used first and then a heavy roller, the compaction result will be better. (2) Influence of soil moisture content. Under the same compaction conditions, due to the frictional resistance between soil particles, drier soil is difficult to compact. When the soil has an appropriate moisture content, water acts as a lubricant between the soil particles, reducing the friction between them and thus facilitating compaction. Therefore, at the optimal moisture content of the soil, the same compaction effort can yield the highest dry unit weight. (3) Influence of soil covering thickness and number of compaction passes. Under the action of compaction work, the stress in soil gradually decreases as depth increases. The thickness of the soil layer should be less than the working depth of the compaction machinery.