黃星






摘 要:結合浙江杭州地鐵7號線盈中車輛段上蓋開發要求,針對其規模大、上蓋高層建筑群柱網間距大、對結構的沉降和差異沉降敏感、地下室面積大以及基坑開挖深度大的特點,根據場區淺層沼氣及軟土發育的特征,開展原位測試工作。采用靜探改裝的專用裝置查明了沼氣的分布及特性,并針對軟基、樁基工程、基坑工程以及場線工程等不同性質工程采取相應的勘察措施。此外,采用薄壁取土器確保土樣質量,加強了靜力觸探、動力觸探以及K30板等原位測試工作并進行了專項水文地質試驗,取得了較好的效果,積累了相應的勘察經驗。
關鍵詞:地鐵;車輛段;整體上蓋;勘察工作;沼氣
中圖分類號:U231 文獻標識碼:A 文章編號:1003-5168(2021)25-0077-06
Actual Record of Investigation Work of Overall Upper Cover Engineering of Metro Depot
HUANG Xing
(Shanghai Municipal Engineering Design Institute(Group)Co., Ltd., Shanghai 200092)
Abstract: Combined with the development requirements of the upper cover of Yingzhong depot of Hangzhou Metro Line 7, in view of its large scale, large column grid spacing of the upper cover high-rise buildings, high requirements for structural settlement and differential settlement control, large basement area and large excavation depth of the foundation pit, and the development characteristics of shallow biogas and soft soil in the site. This paper attaches importance to the in-situ test, the special device modified by static sounding was used to find out the distribution and characteristics of biogas, and targeted survey measures were taken for projects with different properties such as soft foundation, pile foundation engineering, foundation pit engineering and site line engineering. The thin-wall sampler was used to ensure the quality of soil samples, the in-situ tests such as static cone penetration, dynamic cone penetration and K30 plate were strengthened, and special hydrogeological tests were carried out. It has achieved good results and accumulated corresponding exploration experience.
Keywords: metro;depot;overall cover;investigation work;biogas
在城市可用土地資源日益緊張的今天,構建“軌道+物業”資源開發經營新模式,可以實現軌道交通的可持續發展。如在地鐵車輛段上蓋開發項目能夠集約土地資源,達到復合利用空間、集約用地的目的。地鐵車輛段一般建設規模大,為大型工程,且上蓋高層建筑群高低層層高差異大,工程破壞后果嚴重,工程重要性等級高。受車輛段首層限界及工藝限制,柱網間距大,單柱荷載大,對結構的沉降和差異沉降敏感,對勘察提出了很高的要求[1]。
1 工程概況
1.1 工程簡介
浙江杭州地鐵7號線盈中車輛段位于杭州蕭山區,杭金衢高速東側,建設四路北側,長為670~1 200 m,最大寬度為270 m,占地面積為2.15×105 m2,建筑面積約為3.21×105 m2。依據杭州市政府對地鐵車輛基地要求,為了充分發揮軌道交通優勢,有利于土地集約利用,各基地需考慮遠期開發的要求,因此盈中車輛段需要進行加蓋開發。……