Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Dynamic compaction hole forming method under collapsible loess sand inclusion geological condition
The invention discloses a dynamic compaction hole forming method under the collapsible loess sand inclusion geological condition. The dynamic compaction hole forming method comprises the following steps that 1, rotary digging hole forming is carried out on a foundation of the collapsible loess sand inclusion geological condition by adopting a rotary digging hole forming machine, and the hole forming depth is kept at 0.9 m-1.1 m each time; 2, the pile hole is filled with cohesive soil with the water content ranging from 10% to 15%, tamping is carried out at a low falling distance, the cohesive soil is diffused and extruded towards the periphery of the hole wall, and a cohesive soil protection layer is formed on the inner wall of the pile hole; 3, drilling is carried out to a sand layer by adopting the rotary digging hole forming machine, the pile hole is filled with the cohesive soil for hammering, and the steps are repeated until the designed elevation of the bottom of the hole is reached; and 4, an in-hole deep-layer dynamic compaction composite foundation is formed according to layered filling dynamic compaction from bottom to top or dynamic compaction while filling. According to a traditional in-hole deep-layer dynamic compaction hole forming method, under the collapsible loess sand inclusion geological condition, hole collapse is extremely prone to occurring in the early-stage one-time rotary digging hole forming process or the later-stage dynamic compaction backfilling process, the clay protection wall is adopted, a clay protection layer is formed on the hole wall, and the secondary hole forming method is adopted, so that the hole collapse problem in the hole forming and pile forming process is effectively solved.
本发明公开了一种湿陷性黄土夹砂地质条件下强夯成孔的方法，包括：一、采用旋挖成孔机械在湿陷性黄土夹砂地质的地基上旋挖成孔，每次成孔深度为0.9m‑1.1m；二、向桩孔内填入含水率在10%‑15%的粘性土，并低落距夯击，使粘性土向孔壁四周扩散挤压，在桩孔内壁形成粘性土保护层；三、再采用旋挖成孔机械钻孔至砂层，再填入粘性土进行锤击，重复上述步骤至孔底设计标高；四、按自下而上分层填料强夯或边填料边强夯，形成孔内深层强夯复合地基。传统的孔内深层强夯成孔方法在湿陷性黄土夹砂地质条件下，前期一次旋挖成孔或后期强夯回填过程中极易塌孔，通过采用粘土护壁，在孔壁上形成一层粘土保护层并采用二次成孔的方法，有效的解决了成孔、成桩过程中的塌孔问题。
Dynamic compaction hole forming method under collapsible loess sand inclusion geological condition
The invention discloses a dynamic compaction hole forming method under the collapsible loess sand inclusion geological condition. The dynamic compaction hole forming method comprises the following steps that 1, rotary digging hole forming is carried out on a foundation of the collapsible loess sand inclusion geological condition by adopting a rotary digging hole forming machine, and the hole forming depth is kept at 0.9 m-1.1 m each time; 2, the pile hole is filled with cohesive soil with the water content ranging from 10% to 15%, tamping is carried out at a low falling distance, the cohesive soil is diffused and extruded towards the periphery of the hole wall, and a cohesive soil protection layer is formed on the inner wall of the pile hole; 3, drilling is carried out to a sand layer by adopting the rotary digging hole forming machine, the pile hole is filled with the cohesive soil for hammering, and the steps are repeated until the designed elevation of the bottom of the hole is reached; and 4, an in-hole deep-layer dynamic compaction composite foundation is formed according to layered filling dynamic compaction from bottom to top or dynamic compaction while filling. According to a traditional in-hole deep-layer dynamic compaction hole forming method, under the collapsible loess sand inclusion geological condition, hole collapse is extremely prone to occurring in the early-stage one-time rotary digging hole forming process or the later-stage dynamic compaction backfilling process, the clay protection wall is adopted, a clay protection layer is formed on the hole wall, and the secondary hole forming method is adopted, so that the hole collapse problem in the hole forming and pile forming process is effectively solved.
本发明公开了一种湿陷性黄土夹砂地质条件下强夯成孔的方法，包括：一、采用旋挖成孔机械在湿陷性黄土夹砂地质的地基上旋挖成孔，每次成孔深度为0.9m‑1.1m；二、向桩孔内填入含水率在10%‑15%的粘性土，并低落距夯击，使粘性土向孔壁四周扩散挤压，在桩孔内壁形成粘性土保护层；三、再采用旋挖成孔机械钻孔至砂层，再填入粘性土进行锤击，重复上述步骤至孔底设计标高；四、按自下而上分层填料强夯或边填料边强夯，形成孔内深层强夯复合地基。传统的孔内深层强夯成孔方法在湿陷性黄土夹砂地质条件下，前期一次旋挖成孔或后期强夯回填过程中极易塌孔，通过采用粘土护壁，在孔壁上形成一层粘土保护层并采用二次成孔的方法，有效的解决了成孔、成桩过程中的塌孔问题。
Dynamic compaction hole forming method under collapsible loess sand inclusion geological condition
一种湿陷性黄土夹砂地质条件下强夯成孔的方法
ZHANG CHUNJIE (Autor:in) / ZHU JIAFENG (Autor:in) / XU BING (Autor:in) / LI JINGXI (Autor:in) / SONG SHUYANG (Autor:in)
16.11.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
E02D
FOUNDATIONS
,
Gründungen
Micro-Mechanism of Dynamic Compaction on Collapsible Loess
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