摩擦樁：何時何地使用[6常見問題]

Building foundations負責安全，定期將建築物轉移和分配到地麵。

There are各種類型的建築基礎including raft, mat, and pile foundations.樁基礎are particularly used when the foundation soil has a weak load-bearing capacity and shear strength. In such cases, piles are used to transfer the load to deep strong strata.

基於其負載轉移機製，樁可以主要分為兩種類型：終端承載樁和摩擦樁。軸承軸承樁抵抗其橫截麵的承載能力，並將負載傳遞到強大的地層。端部軸承樁上的負載反應是由強烈的地層引起的。

On the other hand, friction piles resist load by developing skin friction on their surface. The cross-sectional resistance is not important in this case. The load reaction acting on the pile is caused by skin friction.

在本文中，我們將討論摩擦樁，我們如何設計它們，在那裏使用它們以及使用時。最後，我們也將在可能出現陰性皮膚摩擦時討論特殊情況。

machine to pile cut尺寸範圍300mm-1200mm

內容

什麼是摩擦樁

Friction piles sometimes also termed floating piles mostly resist the building loads by developing load-bearing capacity through skin shear stresses. Skin shear stresses act along the sides of the pile.

Skin friction arises as a result of adhesion or friction between the pile surface and the surrounding soil. This friction or adhesion also reduces the bulb pressure on the pile surface and all of the pile surfaces act effectively to resist the load. In the case of friction piles, cylindrical shapes pressure zone is formed around the pile surface.

When to Use Friction Pile

These piles are particularly useful in the cases when hard strata are too deep and it is becoming economically unfeasible to use end load bearing piles. In such a case friction piles are used.

另外，在遇到砂質土壤的情況下，它們的使用也更為普遍。當終端堆樁變得太貴無法使用時，它們也使用它們。這尤其適用於非常長端軸承樁。

摩擦樁在哪裏使用

摩擦樁最常見的是具有位於具有強烈地層的砂質基礎上的大型載荷的大結構采用。

Additionally, properly compacted and consolidated sand is an added benefit.

One good example of friction pile applications is tall and superheavy skyscrapers located in Dubai. The soil of Dubai is mostly sand with strong strata lying quite deep in some cases. The world-famous Burj Khalifa has also friction piles installed in its foundation.

如何計算樁上的皮膚摩擦

可以使用以下配方評估樁表麵上的皮膚摩擦（）

Qs =Σf.as，

樁表麵的區域在哪裏單位軸電阻。可以使用以下關係來計算：

f=Kσotan⁡δ+ca

Where K is the earth pressure coefficient, is adhesion coefficient and is soil-pile friction angle. depends on the types of soil. For sands, it is zero while for clayey soils, it has a maximum value. K depends on the pile type, whether it is jetted pile or乏味的堆，或低或高排量驅動樁。取決於樁材料。它對於鋼樁最低，木材或混凝土樁最高。

Different building codes also provide a specialized chart to obtain the skin pile resistance. The charts are usually nomograph relating pile area, length, material, and type of surrounding soil.

樁切割機出售尺寸範圍300mm-1200mm

What Is Negative Skin Friction In Piles

在摩擦樁的情況下，負載向下起作用，而摩擦力以抵抗該負載的作用。摩擦力被稱為皮膚摩擦。

However, in cases when pile and a part of the soil in which the pile is there is settling. And if this settlement is more than the pile settlement, it will also apply downward frictional drag on the pile surface and the force arising on the pile surface due to negative frictional drag is called negative skin friction.

In such a case when loading is applied, there will be two forces acting downward: acting load and negative skin friction. Therefore part of the load-bearing capacity of due skin friction pile will be utilized to overcome negative skin friction and the rest would be available to resist the acting load.

Therefore, the load-bearing capacity of the pile is reduced. There are several reasons for soil settling more than the pile:

如果沉降層非常可壓縮和當n a little bit of loading on this soil is applied, it will settle more than the pile. Hence, negative skin friction will develop.
如果沉降層是最近填充的土壤，那麼隨著時間的推移，將發生整合。由於這種隨著時間的推移整合，負麵皮膚摩擦將發展。
第三種原因是有效的壓力增加。

正如我們所知，合並是有效壓力的函數。因此，當有效的壓力增加時，結算將更多。結果，將開發負片摩擦。當水桌子上升或下降時，會發生情感壓力的變化。

The process of calculation of negative skin friction is similar to skin friction as shown earlier. However, it acts in a downward direction.

Which One To Choose End Bearing Pile Or Friction Pile

軸承和摩擦樁之間的選擇基本上取決於建築基礎和財務限製中遇到的土壤類型。

通常軸承樁是完美的解決方案，當強大的長軸階層沒有那麼深。在這種情況下，軸承堆可以有效地傳遞建築物負荷。在沉降至關重要時，軸承樁也可用。他們在減少建築定居點方麵發揮著良好作用。

Additionally, one should also select end bearing piles over friction piles when pouring water pressures are higher or they are more prone to fluctuations.

同樣，如果存在運河或深排水線，則由於孔隙水壓力過多的風險，應使用可能導致土壤沉澱的風險。當然，在土壤沉降情況下，產生負皮膚摩擦，這將導致摩擦樁的容量降低。

Friction piles are useful when the strong strata are very deep and it is becoming economically unfeasible to have end-bearing piles.

In such cases, friction piles can effectively perform the function by resisting the acting load through the skin friction. The use of friction piles would be more effective when clayey soils are encountered. This is because clayey soils have more adhesion coefficient.