上土钉墙下护壁桩组合支护技术(一)

上土钉墙下护壁桩组合支护技术
吴咏梅1  郁新建2  谭福生2  陈国会2
（ 1邯郸钢铁公司技改部，河北邯郸056003； 2中冶集团华冶资源开发公司，河北邯郸056003 ）
 ［ 内容简介 ］：邯钢新区污水处理站和换热站工程中的地下水池为深基坑施工，基坑深分别为13.7m和13.5m。上部为粘土层，下部为砂卵层，地下水位丰富。根据工程实际选择上土钉墙下护壁桩组合支护技术，该技术充分利用上部较浅部位的土钉墙支护作用和下部较深部位护壁桩支护作用，本工程成功应用了该技术，安全可靠，经济实用。在深基坑中尤其值得推广使用。
 ［ 主题词 ］  土钉墙    护壁桩    组合   支护
 
Application of Combined Supporting Technology
with Soil Nailing Wall at Upper Part and Retaining Piles at Lower Part
 Wuyongmei1  Yuxinjian2  Tanfusheng2   Chenguohui2
 (1 Technical Transformation Department of Handan Steel&Iron Co.,Ltd, Hebei Handan 056003; 2 MCC HuaYe Resources Development Co.,Ltd. Hebei Handan 056003)
 
 Abstract: The undergrand pool is deep foundation pit in the sewage treatment station and heat exchange station in new developed area of Handan Steel & Iron Co.,Ltd, the foundation pit is 13.7m and 13.5m deep respectivly. the foundation pit has rich groundwater and with claypan at upper part and sand gravel stratum at lower part. According to the real engineering situation, the combined supporting technology is adoped with soil nailing wall at upper part and retaining piles at lower part, the technology makes full use of the soil nailing wall support at upper shallow position and retaining piles at lower deep position, the technology is safe, reliable, economical and practical. It is worth to be popularized and applied in deep foundation pit.
 
Key Word:  Soil nailing wall     Retaining piles    Combined    Supporting 
 
一、工程简介
 邯钢新区公辅换热站水池：长35.2m，宽30m，深13.5m，壁厚1.0m 。基坑场地狭小，东有已运行的高炉、焦炉煤气管道，南有氧气调压站，西有热风炉风机及80m高砼烟囱，必须选择科学合理的基坑支护技术平面图（如图1所示）。
 邯钢新区污水处理站隔栅池长17m，东西向长8m，深度13.7m，壁厚1.2m。场地西、南均为主干道，并且在距离基坑边3.5m处为4根Φ900mm的主供水管道及1组通讯光缆，必须确保已经投运道路及管网的安全。平面图如图2所示。
 
图1   污水处理站平面图                              图2      换热站平面图
Figure 1: Plane Figure of the Figure            2: Plane Figure of the Heat Exchange Station
Sewage Treatment Station
二、支护方案选择
 1. 该工程土层分布如下：杂填土、粉质粘土、细砂层、卵石层、高风化粘土岩。地下水位在-5.0m ，主要含水层为细砂层及卵石层，均为承压水层。粘土层为不透水层。

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