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Deformation control method for foundation pit in unsaturated soil under rainfall condition
The invention discloses a deformation control method for a foundation pit in unsaturated soil under a rainfall condition. Construction of an enclosure structure is conducted; arranging monitoring points; a soil body in the foundation pit is excavated, and horizontal inner supports are erected in sequence when the soil body is excavated to the designated height; the rainfall which may occur is judged according to weather forecast, if the rainfall exceeds an early warning value, the construction period is adjusted in combination with the construction progress, and a cement cushion layer is poured at the pit bottom before rainfall occurs and construction is stopped temporarily; if the excavation depth exceeds half of the total excavation depth, after rainfall is finished, a temporary horizontal inner support is additionally arranged near the excavation face; the inner supporting axial force is adjusted according to measured deformation data of the enclosure structure; draining and dewatering are carried out; and after standing for a period of time, continuing excavation construction. According to the method, the cement cushion layer is laid before rainfall to prevent rainfall infiltration, excavation is stopped, axial force control and dewatering of the servo steel support are combined, and finally the deformation control requirement and the foundation pit safety of excavation of the foundation pit in the unsaturated soil under the rainfall condition are met.
本发明公开了一种降雨条件下非饱和土中基坑的变形控制方法，其包括以下步骤。进行围护结构的施工；布置监测点；开挖基坑内土体并在开挖至指定高度时依次架设水平内支撑；根据天气预报判断可能发生的降雨量，若降雨量超过预警值，结合施工进度调整工期，在降雨发生前在坑底浇筑水泥垫层并暂时停止施工；若开挖深度超过总开挖深度的一半，降雨结束后，在开挖面附近增设临时水平内支撑；根据围护结构变形实测数据调整内支撑轴力；进行疏干降水；静置一段时间后，继续开挖施工。本发明通过在降雨前铺设水泥垫层防止降雨入渗并停止开挖，结合伺服钢支撑轴力调控和疏干降水，最终达到确保非饱和土中基坑开挖在降雨条件下的变形控制要求和基坑安全。
Deformation control method for foundation pit in unsaturated soil under rainfall condition
The invention discloses a deformation control method for a foundation pit in unsaturated soil under a rainfall condition. Construction of an enclosure structure is conducted; arranging monitoring points; a soil body in the foundation pit is excavated, and horizontal inner supports are erected in sequence when the soil body is excavated to the designated height; the rainfall which may occur is judged according to weather forecast, if the rainfall exceeds an early warning value, the construction period is adjusted in combination with the construction progress, and a cement cushion layer is poured at the pit bottom before rainfall occurs and construction is stopped temporarily; if the excavation depth exceeds half of the total excavation depth, after rainfall is finished, a temporary horizontal inner support is additionally arranged near the excavation face; the inner supporting axial force is adjusted according to measured deformation data of the enclosure structure; draining and dewatering are carried out; and after standing for a period of time, continuing excavation construction. According to the method, the cement cushion layer is laid before rainfall to prevent rainfall infiltration, excavation is stopped, axial force control and dewatering of the servo steel support are combined, and finally the deformation control requirement and the foundation pit safety of excavation of the foundation pit in the unsaturated soil under the rainfall condition are met.
本发明公开了一种降雨条件下非饱和土中基坑的变形控制方法，其包括以下步骤。进行围护结构的施工；布置监测点；开挖基坑内土体并在开挖至指定高度时依次架设水平内支撑；根据天气预报判断可能发生的降雨量，若降雨量超过预警值，结合施工进度调整工期，在降雨发生前在坑底浇筑水泥垫层并暂时停止施工；若开挖深度超过总开挖深度的一半，降雨结束后，在开挖面附近增设临时水平内支撑；根据围护结构变形实测数据调整内支撑轴力；进行疏干降水；静置一段时间后，继续开挖施工。本发明通过在降雨前铺设水泥垫层防止降雨入渗并停止开挖，结合伺服钢支撑轴力调控和疏干降水，最终达到确保非饱和土中基坑开挖在降雨条件下的变形控制要求和基坑安全。
Deformation control method for foundation pit in unsaturated soil under rainfall condition
一种降雨条件下非饱和土中基坑的变形控制方法
LIN LIHUA (author) / ZHANG JIANBIN (author) / LAI DEJIN (author) / ZHANG XIAOQIAN (author) / LI MINGGUANG (author) / CHEN JINJIAN (author)
2023-05-30
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
Stability Analysis of Unsaturated Soil Slopes under Rainfall Infiltration
| British Library Conference Proceedings | 2012
Probabilistic Stability Analysis of Unsaturated Soil Slopes under Rainfall
| British Library Conference Proceedings | 2016