地基与基础工程
一、地基基础概念 | Foundation Concepts
二、地基处理 | Ground Improvement
三、桩基础 | Pile Foundations
四、桩基检测 | Pile Testing
五、基坑支护 | Excavation Support
Bored Pile Construction — Drilling, Cage Installation and Concrete Pouring
Ding, we're about to start Pile #42 — this is a 24-inch diameter bored pile, 65 feet deep. Run me through the sequence.
丁工，我们要开始42号桩了——直径24英寸钻孔灌注桩，深65英尺。给我过 一遍工序。
丁工: Sure. We've already set the temporary casing — it's 6 feet long, driven through the loose surface soil into firm ground. The auger is ready to go.
好的。我们已经下好临时护筒了——长6英尺，穿过表层松散土打入坚实土层。 钻头已准备就绪。
Operator, start drilling. Maintain vertical alignment — check the plumb of the Kelly bar every 10 feet.
操作手，开始钻孔。保持垂直——每钻进10英尺检查一次钻杆垂直度。
操作员: Drilling. At 10 feet — Kelly bar is plumb. At 20 feet — still good. We hit a gravel layer at about 28 feet. That's consistent with the geotech boring log.
钻进中。10英尺——钻杆垂直。20英尺——仍然正常。大约28英尺碰到了砾石 层。跟地勘钻孔柱状图对得上。
丁工: Good. Keep going. Target depth is 65 feet. Watch the drilling speed — don't force it through the gravel.
好。继续。目标深度65英尺。注意钻进速度——别强行穿过砾石层。
操作员: Reached 65 feet. Stopping the auger. Bottom of the hole feels firm — matching the bearing stratum description.
到达65英尺。钻头停。孔底感觉坚实——跟持力层描述吻合。
Let me verify the depth. (drops weighted tape) ... 65 feet, 2 inches. That's acceptable. Now clean the bottom of the hole.
让我验证深度。（下测绳）……65英尺2英寸。可以接受。现在清孔。
丁工: Operator, run the cleaning bucket. We need less than 2 inches of sediment at the bottom before we place the cage.
操作手，下清孔桶。放钢筋笼之前孔底沉渣要小于2英寸。
操作员: Cleaning bucket coming up. The slurry looks clean — specific gravity is 1.08, sand content under 1%.
清孔桶上来了。泥浆看起来干净——比重1.08，含砂率低于1%。
OK. Approved. Lower the rebar cage. Ding, verify the cage matches the shop drawing.
好。批准了。下钢筋笼。丁工，核实钢筋笼跟施工图一致。
丁工: (checking) Cage is 60 feet long, 21-inch diameter. Main bars: 12 #8 vertical bars. Stirrups: #4 spiral at 6-inch pitch. Centralizers are attached every 10 feet. All correct.
（检查）钢筋笼长60英尺，直径21英寸。主筋：12根8号直筋。箍筋：4号 螺旋筋，间距6英寸。每10英尺装了定位块。全部正确。
Lower it carefully. Don't let it hit the side of the hole.
小心下放。别让它碰孔壁。
丁工: Cage is in place. Top of cage is 3 inches below top of casing. Now we'll insert the tremie pipe for concrete.
笼子就位了。笼顶在护筒顶以下3英寸。现在下导管准备浇混凝土。
Tremie pipe is at the bottom. We'll pour the first batch through the tremie plug. Concrete is 4,000 psi, slump 7 to 8 inches.
导管到孔底了。我们通过导管塞浇首斗混凝土。混凝土4,000 psi，坍落度 7到8英寸。
I want to see at least 20 feet of concrete in the tremie before you start pulling it up. That keeps the seal and prevents contamination.
在你开始提升导管之前，导管里至少要有20英尺混凝土。这样才能保持封闭， 防止污染。
操作员: First batch in — 3 cubic yards. Confirmed good flow through the tremie. Now continuous pour... concrete level rising.
首斗进去了——3立方码。确认导管出料顺畅。现在连续浇筑……混凝土面上 升。
丁工: We've poured 15 cubic yards total. Calculated volume for this pile is 14.2 cubic yards including overbreak. Concrete level is at the top of casing. Pile #42 is complete.
总共浇筑了15立方码。这根桩计算方量含超灌是14.2立方码。混凝土面到 护筒顶部了。42号桩完成。
Good pour. Log it in the pile record: date, time, concrete volume, and any observations. We'll do the integrity test in 7 days.
浇筑顺利。记入桩记录：日期、时间、混凝土方量、所有观察。7天后做 完整性检测。
Static Load Test — Pile Capacity Evaluation
Cai, the static load test on Test Pile TP-01 is set up. The reaction system is ready. Walk me through the test plan.
蔡工，试桩TP-01的静载试验已经准备好了。反力系统就绪。给我过一遍试 验方案。
蔡工: TP-01 is a 24-inch diameter bored pile, 65 feet deep — identical to the production piles. Design working load is 120 tons. We'll test to 240 tons — that's 200% of design load, per ASTM D1143.
TP-01是直径24英寸钻孔灌注桩，深65英尺——和工程桩一致。设计工作荷载 120吨。我们按ASTM D1143测试到240吨——也就是设计荷载的200%。
We're using the quick load test method. Load increments of 20 tons, each held for 5 minutes. Settlement readings at 1, 2, 4, and 5 minutes per increment.
我们采用快速荷载试验法。每级加荷20吨，每级持荷5分钟。每级在1、2、 4和5分钟时读数沉降。
What's the acceptance criteria?
验收标准是什么？
Two criteria. First: total settlement at 200% design load must not exceed 1 inch. Second: net settlement after unloading must not exceed 0.25 inches — that's less than 3/4 inch per the spec.
两个标准。第一：200%设计荷载下总沉降不得超过1英寸。第二：卸载后净 沉降不得超过0.25英寸——规范是小于3/4英寸。
蔡工: Ready to start the test. Hydraulic jack is calibrated. Dial gauges are set to zero on the reference beam. Let's begin — first increment: 20 tons.
准备开始试验。液压千斤顶已校准。百分表在基准梁上归零。开始——第一 级：20吨。
(logging data) Load: 20 tons. Settlement at 1 minute: 0.05 inches. At 5 minutes: 0.08 inches. Stable. Moving to 40 tons.
（记录数据）荷载：20吨。1分钟沉降：0.05英寸。5分钟：0.08英寸。稳 定。增加到40吨。
Settlement is linear so far — that's elastic behavior. Good sign.
目前沉降是线性的——弹性行为。好迹象。
蔡工: At 120 tons — design load. Total settlement: 0.38 inches. That's well within the expected range for this soil profile.
120吨——设计荷载。总沉降：0.38英寸。对于这个地层剖面，这在预期范围 内。
At 180 tons: settlement 0.62 inches. Still behaving well.
180吨：沉降0.62英寸。仍然表现良好。
At 240 tons — 200% design load. Final settlement reading: 0.89 inches. That's under the 1-inch limit.
240吨——200%设计荷载。最终沉降读数：0.89英寸。在1英寸限值之内。
现在开始卸载。Unloading in stages... back to zero load. Rebound to 0.62 inches. Net settlement: 0.89 - 0.62 = 0.27 inches.
现在开始卸载。分级卸载……回到零荷载。回弹到0.62英寸。净沉降：0.89 - 0.62 = 0.27英寸。
Net settlement 0.27 inches — slightly over the 0.25-inch criterion. Bill, your call?
净沉降0.27英寸——略超0.25英寸的标准。Bill，你怎么看？
(examining the load-settlement curve) The curve shows a well- defined elastic region and very little plastic deformation. The 0.02-inch excess is negligible. In my opinion, the pile meets the performance requirements.
（查看荷载-沉降曲线）曲线显示了清晰的弹性区和极小的塑性变形。超的 这0.02英寸可以忽略不计。我认为，这根桩满足性能要求。
Also, the Davisson method gives an ultimate capacity of 380 tons, giving a factor of safety of 3.2 against the 120-ton design load. That's more than the required 2.5.
另外，按Davisson法给出极限承载力380吨，对应120吨设计荷载的安全系数 为3.2。高于要求的2.5。
I'll accept that. Please include the full analysis in the test report. Approved.
我接受。请把完整分析写进试验报告。批准。
蔡工: Will do. I'll prepare the report with the complete load- settlement data and the capacity analysis. Production piling can proceed with the approved design.
好的。我准备包含完整荷载-沉降数据和承载力分析的报告。工程桩可以按 批准的设计继续施工了。