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From page 81... ... 81 Observations from Implementation of Specification Introduction To evaluate and validate the practicality of the developed forward models and backcalculation algorithms under field conditions, four additional test construction sites were visited for actual field implementation of IC. The evaluation and validation processes at these sites were aimed to help understand the variabilities associated with the construction and compaction phases under field conditions. Read the entire page →
From page 82... ... 82 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction Site Location Length Section Layer Roller * Drum Mass (Weight) Read the entire page →
From page 83... ... Location of Test Section (a) Read the entire page →
From page 84... ... 84 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction (a) Location of Test Section (b) Read the entire page →
From page 85... ... Observations from Implementation of Specification 85 (b) Read the entire page →
From page 86... ... 86 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction Vendor/Manufacturer Model Width (m) Read the entire page →
From page 87... ... Observations from Implementation of Specification 87 Laboratory Testing Table 7-3 summarizes the index properties of all sampled materials, including the classification of each geomaterial, as per the Unified Soil Classification System (USCS) Read the entire page →
From page 88... ... 88 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction improve the predictive accuracy following the process described in Chapter 6 and illustrated in Figure 6-6. The surface displacement data obtained for each sublot during the proof-mapping process was input into the appropriate ANN inverse solver. Read the entire page →
From page 89... ... Observations from Implementation of Specification 89 two-layer systems of each sublot were used as inputs. Figure 7-11 compares the extracted moduli of the top layer with the corresponding backcalculated LWD moduli. Read the entire page →
From page 90... ... 90 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction 20 40 60 80 STA +000 STA +020 STA +040 STA +080 STA +100 STA +120 STA +140 STA +160 STA +180 M od ul us (M Pa ) LWD Modulus Extracted Modulus (a) Read the entire page →
From page 91... ... Observations from Implementation of Specification 91 because each point was calculated using an average of up to 50 surface displacement values measured in each sublot, and also because the single k ′1 value has been adjusted and assigned to represent a station. The LWD and extracted moduli exhibit similar trends along the length of the lot for all four sites. Read the entire page →
From page 92... ... 92 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction 0 20 40 60 80 STA +020 STA +040 STA +060 STA +080 STA +100 STA +120 STA +140 STA +160 STA +180 STA +200 M od ul us (M Pa ) LWD Modulus Extracted Modulus (a) Read the entire page →
From page 93... ... Observations from Implementation of Specification 93 Units in MPa (c) Read the entire page →
From page 94... ... 94 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction 0 20 40 60 80 100 Pe rc en t E rr or (% ) Eleven Spots Five Spots Figure 7-16. Read the entire page →
From page 95... ... Observations from Implementation of Specification 95 y = 0.19x R² = 0.43 25 30 35 40 45 50 55 60 160 180 200 220 240 Drum Force (kN) Read the entire page →
From page 96... ... 96 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction Figure 7-20 compares the retrieved layer moduli with their corresponding LWD moduli after implementing the proposed approach for subgrade and base materials at those test sections. Data points represent average of extracted layer moduli of the sublots with the COV of CMV less than or equal to 25% and LWD moduli as obtained for each of the evaluated test sites. Read the entire page →
From page 97... ... Observations from Implementation of Specification 97 Boussinesq theory. This limitation is particularly critical for a multi-layered system being tested with deflection. Read the entire page →
From page 98... ... 98 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction 0 50 100 150 200 STA +000 STA +025 STA +050 STA +075 STA +100 STA +125 STA +150 STA +175 STA +200 STA +225 STA +250 St iff ne ss (M N /m ) Target Stiffness 75% Marginal Acceptance 0 25 50 75 100 St iff ne ss (M N /m ) Read the entire page →
From page 99... ... Observations from Implementation of Specification 99 0 50 100 150 St iff ne ss (M N /m ) Target Stiffness 75% Marginal Acceptance 0 25 50 75 100 125 150 St iff ne ss (M N /m ) Read the entire page →

From page 81...

... 81 Observations from Implementation of Specification Introduction To evaluate and validate the practicality of the developed forward models and backcalculation algorithms under field conditions, four additional test construction sites were visited for actual field implementation of IC. The evaluation and validation processes at these sites were aimed to help understand the variabilities associated with the construction and compaction phases under field conditions.