Đang chuẩn bị liên kết để tải về tài liệu:
Shallow Foundations

Không đóng trình duyệt đến khi xuất hiện nút TẢI XUỐNG Tải xuống

Shallow Foundations 31.1 31.2 31.3 31.4 Introduction Design Requirements Failure Modes of Shallow Foundations Bearing Capacity for Shallow Foundations Bearing Capacity Equation • Bearing Capacity on Sand from Standard Penetration Tests (SPT) • Bearing Capacity from Cone Penetration Tests (CPT) • Bearing Capacity from Pressuremeter Tests (PMT) • Bearing Capacity According to Building Codes • Predicted Bearing Capacity vs. Load Test Results | Chai J. Shallow Foundations. Bridge Engineering Handbook. Ed. Wai-Fah Chen and Lian Duan Boca Raton CRC Press 2000 31 Shallow Foundations 31.1 Introduction 31.2 Design Requirements 31.3 Failure Modes of Shallow Foundations 31.4 Bearing Capacity for Shallow Foundations 31.5 Bearing Capacity Equation Bearing Capacity on Sand from Standard Penetration Tests SPT Bearing Capacity from Cone Penetration Tests CPT Bearing Capacity from Pressuremeter Tests PMT Bearing Capacity According to Building Codes Predicted Bearing Capacity vs. Load Test Results Stress Distribution Due to Footing Pressures 31.6 Semi-infinite Elastic Foundations Layered Systems Simplified Method 2 1 Method Settlement of Shallow Foundations 31.7 Immediate Settlement by Elastic Methods Settlement of Shallow Foundations on Sand Settlement of Shallow Foundations on Clay Tolerable Settlement Shallow Foundations on Rock James Chai Bearing Capacity According to Building Codes Bearing Capacity of Fractured Rock Settlement of Foundations on Rock California Department of Transportation 31.8 Structural Design of Spreading Footings 31.1 Introduction A shallow foundation may be defined as one in which the foundation depth D is less than or on the order of its least width B as illustrated in Figure 31.1. Commonly used types of shallow foundations include spread footings strap footings combined footings and mat or raft footings. Shallow foundations or footings provide their support entirely from their bases whereas deep foundations derive the capacity from two parts skin friction and base support or one of these two. This chapter is primarily designated to the discussion of the bearing capacity and settlement of shallow foundations although structural considerations for footing design are briefly addressed. Deep foundations for bridges are discussed in Chapter 32. 2000 by CRC Press LLC P FIGURE 31.1 Definition sketch for shallow footings. TABLE 31.1 Typical Values of Safety Factors Used in Foundation Design after .